clearance


Chris Walterson
 

What are we looking for in prop to ground clearance?.  Does the Q do a flair on landing or does it stay relativley flat?

 With the water line level I have three inch clearance with a 58 inch prop. I can cut it down no problem if need be.

thanks -----------  Chris



--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus


gbrighton@...
 

Chris,
Im not qualified to answer but 3 inch Prop /Gnd clearance Doesn't sound enough ! .. The Flying Q guys are asleep on this one !? .. Seeing the Exhaust coming out of the Cowling is looking like things are getting Serious ; )
You let me know on another List that you were intending the use SDS for Engine management . I was hoping to use the OEM Soob ecu .. anyway long story short i have 'left' that effort ... !! ... and have now installed a SDS ecu .. Gnd running seems good .. and if weather is ok will be test Flying it this wkend .
Graham

.
To: <main@Q-List.groups.io>
Subject: [Q-List] clearance


What are we looking for in prop to ground clearance?. Does the Q do a
flair on landing or does it stay relativley flat?

With the water line level I have three inch clearance with a 58 inch
prop. I can cut it down no problem if need be.

thanks ----------- Chris



-=-=-=-=-=-=-=-=-=-=-=-




--
This email has been checked for viruses by AVG.
https://www.avg.com


Paul Fisher
 

(...yawn...) Ok, I'm awake now, my bad.

I've got a 60"x68" prop on mine and have no problems with ground clearance.  I haven't measured it with the fuselage level.  I'll try to do that next time I'm at the hangar.  It's too cold and snowy to do anything else!

I take off and land at ground attack angle (all three wheels depart and land simultaneously).  I do not do wheel landings.  If the tail wheel doesn't touch down with the mains, I'm going way too fast.  Not to say I haven't done it, but I immediately know I screwed up!

Your milage may vary, but that's how I've been flying it all these years.

Paul Fisher
Q-200 N17PF

Now back to it... ZZZZzzzz



On Thu, Feb 18, 2021, 17:03 <gbrighton@...> wrote:
Chris,
            Im not qualified to answer but 3 inch Prop /Gnd clearance
Doesn't sound  enough ! .. The Flying Q guys are asleep on this one !? ..
Seeing the Exhaust coming out of the Cowling is looking like things are
getting Serious ; )
You let me know on another List that you were intending the use SDS for
Engine management . I was hoping to use the OEM Soob ecu .. anyway long
story short i have 'left' that effort ... !!  ... and have now installed a
SDS ecu .. Gnd running seems good  .. and if weather is ok will be test
Flying it this wkend  .
Graham

.
To: <main@Q-List.groups.io>
Subject: [Q-List] clearance

>
>  What are we looking for in prop to ground clearance?.  Does the Q do a
> flair on landing or does it stay relativley flat?
>
>  With the water line level I have three inch clearance with a 58 inch
> prop. I can cut it down no problem if need be.
>
> thanks -----------  Chris
>
>
>
>



ryan goodman
 

Caveat: this doesn't apply to experimental. But it's the standard for certified and fully aligns with what most people seem to think is prudent. You are the ultimate decider though. 

https://www.law.cornell.edu/cfr/text/14/25.925


On Thu, Feb 18, 2021 at 4:23 PM, Paul Fisher
<rv7a.n18pf@...> wrote:
(...yawn...) Ok, I'm awake now, my bad.

I've got a 60"x68" prop on mine and have no problems with ground clearance.  I haven't measured it with the fuselage level.  I'll try to do that next time I'm at the hangar.  It's too cold and snowy to do anything else!

I take off and land at ground attack angle (all three wheels depart and land simultaneously).  I do not do wheel landings.  If the tail wheel doesn't touch down with the mains, I'm going way too fast.  Not to say I haven't done it, but I immediately know I screwed up!

Your milage may vary, but that's how I've been flying it all these years.

Paul Fisher
Q-200 N17PF

Now back to it... ZZZZzzzz



On Thu, Feb 18, 2021, 17:03 <gbrighton@...> wrote:
Chris,
            Im not qualified to answer but 3 inch Prop /Gnd clearance
Doesn't sound  enough ! .. The Flying Q guys are asleep on this one !? ..
Seeing the Exhaust coming out of the Cowling is looking like things are
getting Serious ; )
You let me know on another List that you were intending the use SDS for
Engine management . I was hoping to use the OEM Soob ecu .. anyway long
story short i have 'left' that effort ... !!  ... and have now installed a
SDS ecu .. Gnd running seems good  .. and if weather is ok will be test
Flying it this wkend  .
Graham

.
To: <main@Q-List.groups.io>
Subject: [Q-List] clearance

>
>  What are we looking for in prop to ground clearance?.  Does the Q do a
> flair on landing or does it stay relativley flat?
>
>  With the water line level I have three inch clearance with a 58 inch
> prop. I can cut it down no problem if need be.
>
> thanks -----------  Chris
>
>
>
>



Jim Patillo
 

ZZzzzzzzzzzz....... I run a 60/72 Catto Prop.
Tailwheel first landing from the beginning, hopefully mains after that. Same prop since 2001. No issues. 
zzzzzzzzzzZZ.

Jim
N46JP Q200



Sent from Outer Space


From: main@Q-List.groups.io <main@Q-List.groups.io> on behalf of gbrighton@... <gbrighton@...>
Sent: Thursday, February 18, 2021 3:02:55 PM
To: main@Q-List.groups.io <main@Q-List.groups.io>
Subject: Re: [Q-List] clearance
 
Chris,
            Im not qualified to answer but 3 inch Prop /Gnd clearance
Doesn't sound  enough ! .. The Flying Q guys are asleep on this one !? ..
Seeing the Exhaust coming out of the Cowling is looking like things are
getting Serious ; )
You let me know on another List that you were intending the use SDS for
Engine management . I was hoping to use the OEM Soob ecu .. anyway long
story short i have 'left' that effort ... !!  ... and have now installed a
SDS ecu .. Gnd running seems good  .. and if weather is ok will be test
Flying it this wkend  .
Graham

.
To: <main@Q-List.groups.io>
Subject: [Q-List] clearance

>
>  What are we looking for in prop to ground clearance?.  Does the Q do a
> flair on landing or does it stay relativley flat?
>
>  With the water line level I have three inch clearance with a 58 inch
> prop. I can cut it down no problem if need be.
>
> thanks -----------  Chris
>
>
>
>



ryan goodman
 

Sounds like you tail dragger guys are getting away with a few more inches than the TriQ folks.


On Thu, Feb 18, 2021 at 5:52 PM, Jim Patillo
<Logistics_engineering@...> wrote:
ZZzzzzzzzzzz....... I run a 60/72 Catto Prop.
Tailwheel first landing from the beginning, hopefully mains after that. Same prop since 2001. No issues. 
zzzzzzzzzzZZ.

Jim
N46JP Q200



Sent from Outer Space

From: main@Q-List.groups.io <main@Q-List.groups.io> on behalf of gbrighton@... <gbrighton@...>
Sent: Thursday, February 18, 2021 3:02:55 PM
To: main@Q-List.groups.io <main@Q-List.groups.io>
Subject: Re: [Q-List] clearance
 
Chris,
            Im not qualified to answer but 3 inch Prop /Gnd clearance
Doesn't sound  enough ! .. The Flying Q guys are asleep on this one !? ..
Seeing the Exhaust coming out of the Cowling is looking like things are
getting Serious ; )
You let me know on another List that you were intending the use SDS for
Engine management . I was hoping to use the OEM Soob ecu .. anyway long
story short i have 'left' that effort ... !!  ... and have now installed a
SDS ecu .. Gnd running seems good  .. and if weather is ok will be test
Flying it this wkend  .
Graham

.
To: <main@Q-List.groups.io>
Subject: [Q-List] clearance

>
>  What are we looking for in prop to ground clearance?.  Does the Q do a
> flair on landing or does it stay relativley flat?
>
>  With the water line level I have three inch clearance with a 58 inch
> prop. I can cut it down no problem if need be.
>
> thanks -----------  Chris
>
>
>
>



Jay Scheevel
 

I have 11 inches of clearance, but I am in a tri-gear and my prop is 54 inches in diameter. If I ran Jim’s prop length, I would be 8 inch clearance. I think you do not want 3 inch clearance even if you think you are not going to strike the prop (although a good bounced landing and you will flex the canard at least 3 inches), but the main concern would be ruining your prop by sucking in debris off the ground.

 

Cheers,

Jay

 

From: main@Q-List.groups.io <main@Q-List.groups.io> On Behalf Of Jim Patillo
Sent: Thursday, February 18, 2021 5:53 PM
To: main@Q-List.groups.io
Subject: Re: [Q-List] clearance

 

ZZzzzzzzzzzz....... I run a 60/72 Catto Prop.

Tailwheel first landing from the beginning, hopefully mains after that. Same prop since 2001. No issues. 

zzzzzzzzzzZZ.

 

Jim

N46JP Q200

 

 

 

Sent from Outer Space


From: main@Q-List.groups.io <main@Q-List.groups.io> on behalf of gbrighton@... <gbrighton@...>
Sent: Thursday, February 18, 2021 3:02:55 PM
To: main@Q-List.groups.io <main@Q-List.groups.io>
Subject: Re: [Q-List] clearance

 

Chris,
            Im not qualified to answer but 3 inch Prop /Gnd clearance
Doesn't sound  enough ! .. The Flying Q guys are asleep on this one !? ..
Seeing the Exhaust coming out of the Cowling is looking like things are
getting Serious ; )
You let me know on another List that you were intending the use SDS for
Engine management . I was hoping to use the OEM Soob ecu .. anyway long
story short i have 'left' that effort ... !!  ... and have now installed a
SDS ecu .. Gnd running seems good  .. and if weather is ok will be test
Flying it this wkend  .
Graham

.
To: <main@Q-List.groups.io>
Subject: [Q-List] clearance

>
>  What are we looking for in prop to ground clearance?.  Does the Q do a
> flair on landing or does it stay relativley flat?
>
>  With the water line level I have three inch clearance with a 58 inch
> prop. I can cut it down no problem if need be.
>
> thanks -----------  Chris
>
>
>
>


Richard Kaczmarek 3RD
 

Actually depending on who you use for the AW certification prop clearance does matter. The FAA here would not sign off on AW for a tri gear Sonex due to the prop only having a light 5" of clearance. To show us why he had us let the air out on the nose wheel at which point the tips would just miss the ground. Then said "a flat tire just got you a prop strike".

Richard

On Thu, Feb 18, 2021, 7:52 PM Jim Patillo <Logistics_engineering@...> wrote:
ZZzzzzzzzzzz....... I run a 60/72 Catto Prop.
Tailwheel first landing from the beginning, hopefully mains after that. Same prop since 2001. No issues. 
zzzzzzzzzzZZ.

Jim
N46JP Q200



Sent from Outer Space

From: main@Q-List.groups.io <main@Q-List.groups.io> on behalf of gbrighton@... <gbrighton@...>
Sent: Thursday, February 18, 2021 3:02:55 PM
To: main@Q-List.groups.io <main@Q-List.groups.io>
Subject: Re: [Q-List] clearance
 
Chris,
            Im not qualified to answer but 3 inch Prop /Gnd clearance
Doesn't sound  enough ! .. The Flying Q guys are asleep on this one !? ..
Seeing the Exhaust coming out of the Cowling is looking like things are
getting Serious ; )
You let me know on another List that you were intending the use SDS for
Engine management . I was hoping to use the OEM Soob ecu .. anyway long
story short i have 'left' that effort ... !!  ... and have now installed a
SDS ecu .. Gnd running seems good  .. and if weather is ok will be test
Flying it this wkend  .
Graham

.
To: <main@Q-List.groups.io>
Subject: [Q-List] clearance

>
>  What are we looking for in prop to ground clearance?.  Does the Q do a
> flair on landing or does it stay relativley flat?
>
>  With the water line level I have three inch clearance with a 58 inch
> prop. I can cut it down no problem if need be.
>
> thanks -----------  Chris
>
>
>
>



Robert Cringely
 

It's experimental so do whatever you can get away with, but for Part 23 certification, the FAA requires nine inches for taildraggers with flat tires:

Sec. 23.925 — Propeller clearance.

Unless smaller clearances are substantiated, propeller clearances, with the airplane at the most adverse combination of weight and center of gravity, and with the propeller in the most adverse pitch position, may not be less than the following:

(a) Ground clearance. There must be a clearance of at least seven inches (for each airplane with nose wheel landing gear) or nine inches (for each airplane with tail wheel landing gear) between each propeller and the ground with the landing gear statically deflected and in the level, normal takeoff, or taxing attitude, whichever is most critical. In addition, for each airplane with conventional landing gear struts using fluid or mechanical means for absorbing landing shocks, there must be positive clearance between the propeller and the ground in the level takeoff attitude with the critical tire completely deflated and the corresponding landing gear strut bottomed. Positive clearance for airplanes using leaf spring struts is shown with a deflection corresponding to 1.5 g.

(b) Aft-mounted propellers. In addition to the clearances specified in paragraph (a) of this section, an airplane with an aft mounted propeller must be designed such that the propeller will not contact the runway surface when the airplane is in the maximum pitch attitude attainable during normal takeoffs and landings.

(c) Water clearance. There must be a clearance of at least 18 inches between each propeller and the water, unless compliance with §23.239 can be shown with a lesser clearance.

(d) Structural clearance. There must be—

(1) At least one inch radial clearance between the blade tips and the airplane structure, plus any additional radial clearance necessary to prevent harmful vibration;

(2) At least one-half inch longitudinal clearance between the propeller blades or cuffs and stationary parts of the airplane; and

(3) Positive clearance between other rotating parts of the propeller or spinner and stationary parts of the airplane.

[Doc. No. 4080, 29 FR 17955, Dec. 18, 1964, as amended by Amdt. 23–43, 58 FR 18971, Apr. 9, 1993; Amdt. 23–51, 61 FR 5136, Feb. 9, 1996; Amdt. 23–48, 61 FR 5148, Feb. 9, 1996]



On Thu, Feb 18, 2021 at 5:08 PM Richard Kaczmarek 3RD <fastlittleairplanes@...> wrote:
Actually depending on who you use for the AW certification prop clearance does matter. The FAA here would not sign off on AW for a tri gear Sonex due to the prop only having a light 5" of clearance. To show us why he had us let the air out on the nose wheel at which point the tips would just miss the ground. Then said "a flat tire just got you a prop strike".

Richard

On Thu, Feb 18, 2021, 7:52 PM Jim Patillo <Logistics_engineering@...> wrote:
ZZzzzzzzzzzz....... I run a 60/72 Catto Prop.
Tailwheel first landing from the beginning, hopefully mains after that. Same prop since 2001. No issues. 
zzzzzzzzzzZZ.

Jim
N46JP Q200



Sent from Outer Space

From: main@Q-List.groups.io <main@Q-List.groups.io> on behalf of gbrighton@... <gbrighton@...>
Sent: Thursday, February 18, 2021 3:02:55 PM
To: main@Q-List.groups.io <main@Q-List.groups.io>
Subject: Re: [Q-List] clearance
 
Chris,
            Im not qualified to answer but 3 inch Prop /Gnd clearance
Doesn't sound  enough ! .. The Flying Q guys are asleep on this one !? ..
Seeing the Exhaust coming out of the Cowling is looking like things are
getting Serious ; )
You let me know on another List that you were intending the use SDS for
Engine management . I was hoping to use the OEM Soob ecu .. anyway long
story short i have 'left' that effort ... !!  ... and have now installed a
SDS ecu .. Gnd running seems good  .. and if weather is ok will be test
Flying it this wkend  .
Graham

.
To: <main@Q-List.groups.io>
Subject: [Q-List] clearance

>
>  What are we looking for in prop to ground clearance?.  Does the Q do a
> flair on landing or does it stay relativley flat?
>
>  With the water line level I have three inch clearance with a 58 inch
> prop. I can cut it down no problem if need be.
>
> thanks -----------  Chris
>
>
>
>



Terry Adams
 

Speeduino EFI and EI works quite well, and is a good continuation of "Experimental" aircraft.� Nothing against SDS which I am using in my T18.

Terry
N41521� DF Mk1

On 2/18/2021 3:02 PM, gbrighton@... wrote:
Chris,
���������� Im not qualified to answer but 3 inch Prop /Gnd clearance Doesn't sound� enough ! .. The Flying Q guys are asleep on this one !? .. Seeing the Exhaust coming out of the Cowling is looking like things are getting Serious ; )
You let me know on another List that you were intending the use SDS for Engine management . I was hoping to use the OEM Soob ecu .. anyway long story short i have 'left' that effort ... !!� ... and have now installed a SDS ecu .. Gnd running seems good� .. and if weather is ok will be test Flying it this wkend� .
Graham

.
To: <main@Q-List.groups.io>
Subject: [Q-List] clearance


�What are we looking for in prop to ground clearance?.� Does the Q do a
flair on landing or does it stay relativley flat?

�With the water line level I have three inch clearance with a 58 inch
prop. I can cut it down no problem if need be.

thanks -----------� Chris







-- 
Communication ink and paper free


Jim Patillo
 

I don’t know but all’s I know is FAA FISDO signed mine off at 25 hours. No issue. It’s an experimental! I’ve managed some pretty shitty landings (have a G meter to prove it), some loaded pretty heavy and have never pranged the prop. Just sayin’

Jim
N46JP - Q200

Sent from Outer Space


From: main@Q-List.groups.io <main@Q-List.groups.io> on behalf of Robert Cringely <bob@...>
Sent: Thursday, February 18, 2021 6:29:48 PM
To: main@q-list.groups.io <main@q-list.groups.io>
Subject: Re: [Q-List] clearance
 
It's experimental so do whatever you can get away with, but for Part 23 certification, the FAA requires nine inches for taildraggers with flat tires:

Sec. 23.925 — Propeller clearance.

Unless smaller clearances are substantiated, propeller clearances, with the airplane at the most adverse combination of weight and center of gravity, and with the propeller in the most adverse pitch position, may not be less than the following:

(a) Ground clearance. There must be a clearance of at least seven inches (for each airplane with nose wheel landing gear) or nine inches (for each airplane with tail wheel landing gear) between each propeller and the ground with the landing gear statically deflected and in the level, normal takeoff, or taxing attitude, whichever is most critical. In addition, for each airplane with conventional landing gear struts using fluid or mechanical means for absorbing landing shocks, there must be positive clearance between the propeller and the ground in the level takeoff attitude with the critical tire completely deflated and the corresponding landing gear strut bottomed. Positive clearance for airplanes using leaf spring struts is shown with a deflection corresponding to 1.5 g.

(b) Aft-mounted propellers. In addition to the clearances specified in paragraph (a) of this section, an airplane with an aft mounted propeller must be designed such that the propeller will not contact the runway surface when the airplane is in the maximum pitch attitude attainable during normal takeoffs and landings.

(c) Water clearance. There must be a clearance of at least 18 inches between each propeller and the water, unless compliance with §23.239 can be shown with a lesser clearance.

(d) Structural clearance. There must be—

(1) At least one inch radial clearance between the blade tips and the airplane structure, plus any additional radial clearance necessary to prevent harmful vibration;

(2) At least one-half inch longitudinal clearance between the propeller blades or cuffs and stationary parts of the airplane; and

(3) Positive clearance between other rotating parts of the propeller or spinner and stationary parts of the airplane.

[Doc. No. 4080, 29 FR 17955, Dec. 18, 1964, as amended by Amdt. 23–43, 58 FR 18971, Apr. 9, 1993; Amdt. 23–51, 61 FR 5136, Feb. 9, 1996; Amdt. 23–48, 61 FR 5148, Feb. 9, 1996]



On Thu, Feb 18, 2021 at 5:08 PM Richard Kaczmarek 3RD <fastlittleairplanes@...> wrote:
Actually depending on who you use for the AW certification prop clearance does matter. The FAA here would not sign off on AW for a tri gear Sonex due to the prop only having a light 5" of clearance. To show us why he had us let the air out on the nose wheel at which point the tips would just miss the ground. Then said "a flat tire just got you a prop strike".

Richard

On Thu, Feb 18, 2021, 7:52 PM Jim Patillo <Logistics_engineering@...> wrote:
ZZzzzzzzzzzz....... I run a 60/72 Catto Prop.
Tailwheel first landing from the beginning, hopefully mains after that. Same prop since 2001. No issues. 
zzzzzzzzzzZZ.

Jim
N46JP Q200



Sent from Outer Space

From: main@Q-List.groups.io <main@Q-List.groups.io> on behalf of gbrighton@... <gbrighton@...>
Sent: Thursday, February 18, 2021 3:02:55 PM
To: main@Q-List.groups.io <main@Q-List.groups.io>
Subject: Re: [Q-List] clearance
 
Chris,
            Im not qualified to answer but 3 inch Prop /Gnd clearance
Doesn't sound  enough ! .. The Flying Q guys are asleep on this one !? ..
Seeing the Exhaust coming out of the Cowling is looking like things are
getting Serious ; )
You let me know on another List that you were intending the use SDS for
Engine management . I was hoping to use the OEM Soob ecu .. anyway long
story short i have 'left' that effort ... !!  ... and have now installed a
SDS ecu .. Gnd running seems good  .. and if weather is ok will be test
Flying it this wkend  .
Graham

.
To: <main@Q-List.groups.io>
Subject: [Q-List] clearance

>
>  What are we looking for in prop to ground clearance?.  Does the Q do a
> flair on landing or does it stay relativley flat?
>
>  With the water line level I have three inch clearance with a 58 inch
> prop. I can cut it down no problem if need be.
>
> thanks -----------  Chris
>
>
>
>



Jay Scheevel
 

Hi Jim,
You have told us how long your prop is but we still don’t know what you prop tip ground clearance is. 

Cheers,
Jay

On Feb 18, 2021, at 7:55 PM, Jim Patillo <Logistics_engineering@...> wrote:


I don’t know but all’s I know is FAA FISDO signed mine off at 25 hours. No issue. It’s an experimental! I’ve managed some pretty shitty landings (have a G meter to prove it), some loaded pretty heavy and have never pranged the prop. Just sayin’

Jim
N46JP - Q200

Sent from Outer Space

From: main@Q-List.groups.io <main@Q-List.groups.io> on behalf of Robert Cringely <bob@...>
Sent: Thursday, February 18, 2021 6:29:48 PM
To: main@q-list.groups.io <main@q-list.groups.io>
Subject: Re: [Q-List] clearance
 
It's experimental so do whatever you can get away with, but for Part 23 certification, the FAA requires nine inches for taildraggers with flat tires:

Sec. 23.925 — Propeller clearance.

Unless smaller clearances are substantiated, propeller clearances, with the airplane at the most adverse combination of weight and center of gravity, and with the propeller in the most adverse pitch position, may not be less than the following:

(a) Ground clearance. There must be a clearance of at least seven inches (for each airplane with nose wheel landing gear) or nine inches (for each airplane with tail wheel landing gear) between each propeller and the ground with the landing gear statically deflected and in the level, normal takeoff, or taxing attitude, whichever is most critical. In addition, for each airplane with conventional landing gear struts using fluid or mechanical means for absorbing landing shocks, there must be positive clearance between the propeller and the ground in the level takeoff attitude with the critical tire completely deflated and the corresponding landing gear strut bottomed. Positive clearance for airplanes using leaf spring struts is shown with a deflection corresponding to 1.5 g.

(b) Aft-mounted propellers. In addition to the clearances specified in paragraph (a) of this section, an airplane with an aft mounted propeller must be designed such that the propeller will not contact the runway surface when the airplane is in the maximum pitch attitude attainable during normal takeoffs and landings.

(c) Water clearance. There must be a clearance of at least 18 inches between each propeller and the water, unless compliance with §23.239 can be shown with a lesser clearance.

(d) Structural clearance. There must be—

(1) At least one inch radial clearance between the blade tips and the airplane structure, plus any additional radial clearance necessary to prevent harmful vibration;

(2) At least one-half inch longitudinal clearance between the propeller blades or cuffs and stationary parts of the airplane; and

(3) Positive clearance between other rotating parts of the propeller or spinner and stationary parts of the airplane.

[Doc. No. 4080, 29 FR 17955, Dec. 18, 1964, as amended by Amdt. 23–43, 58 FR 18971, Apr. 9, 1993; Amdt. 23–51, 61 FR 5136, Feb. 9, 1996; Amdt. 23–48, 61 FR 5148, Feb. 9, 1996]



On Thu, Feb 18, 2021 at 5:08 PM Richard Kaczmarek 3RD <fastlittleairplanes@...> wrote:
Actually depending on who you use for the AW certification prop clearance does matter. The FAA here would not sign off on AW for a tri gear Sonex due to the prop only having a light 5" of clearance. To show us why he had us let the air out on the nose wheel at which point the tips would just miss the ground. Then said "a flat tire just got you a prop strike".

Richard

On Thu, Feb 18, 2021, 7:52 PM Jim Patillo <Logistics_engineering@...> wrote:
ZZzzzzzzzzzz....... I run a 60/72 Catto Prop.
Tailwheel first landing from the beginning, hopefully mains after that. Same prop since 2001. No issues. 
zzzzzzzzzzZZ.

Jim
N46JP Q200



Sent from Outer Space

From: main@Q-List.groups.io <main@Q-List.groups.io> on behalf of gbrighton@... <gbrighton@...>
Sent: Thursday, February 18, 2021 3:02:55 PM
To: main@Q-List.groups.io <main@Q-List.groups.io>
Subject: Re: [Q-List] clearance
 
Chris,
            Im not qualified to answer but 3 inch Prop /Gnd clearance
Doesn't sound  enough ! .. The Flying Q guys are asleep on this one !? ..
Seeing the Exhaust coming out of the Cowling is looking like things are
getting Serious ; )
You let me know on another List that you were intending the use SDS for
Engine management . I was hoping to use the OEM Soob ecu .. anyway long
story short i have 'left' that effort ... !!  ... and have now installed a
SDS ecu .. Gnd running seems good  .. and if weather is ok will be test
Flying it this wkend  .
Graham

.
To: <main@Q-List.groups.io>
Subject: [Q-List] clearance

>
>  What are we looking for in prop to ground clearance?.  Does the Q do a
> flair on landing or does it stay relativley flat?
>
>  With the water line level I have three inch clearance with a 58 inch
> prop. I can cut it down no problem if need be.
>
> thanks -----------  Chris
>
>
>
>



Jim Patillo
 

Jay I’ll be at the airport tomorrow and will measure it. 

Jim

Sent from Outer Space


From: main@Q-List.groups.io <main@Q-List.groups.io> on behalf of Jay Scheevel <jay@...>
Sent: Thursday, February 18, 2021 8:32:11 PM
To: main@q-list.groups.io <main@q-list.groups.io>
Subject: Re: [Q-List] clearance
 
Hi Jim,
You have told us how long your prop is but we still don’t know what you prop tip ground clearance is. 

Cheers,
Jay

On Feb 18, 2021, at 7:55 PM, Jim Patillo <Logistics_engineering@...> wrote:


I don’t know but all’s I know is FAA FISDO signed mine off at 25 hours. No issue. It’s an experimental! I’ve managed some pretty shitty landings (have a G meter to prove it), some loaded pretty heavy and have never pranged the prop. Just sayin’

Jim
N46JP - Q200

Sent from Outer Space

From: main@Q-List.groups.io <main@Q-List.groups.io> on behalf of Robert Cringely <bob@...>
Sent: Thursday, February 18, 2021 6:29:48 PM
To: main@q-list.groups.io <main@q-list.groups.io>
Subject: Re: [Q-List] clearance
 
It's experimental so do whatever you can get away with, but for Part 23 certification, the FAA requires nine inches for taildraggers with flat tires:

Sec. 23.925 — Propeller clearance.

Unless smaller clearances are substantiated, propeller clearances, with the airplane at the most adverse combination of weight and center of gravity, and with the propeller in the most adverse pitch position, may not be less than the following:

(a) Ground clearance. There must be a clearance of at least seven inches (for each airplane with nose wheel landing gear) or nine inches (for each airplane with tail wheel landing gear) between each propeller and the ground with the landing gear statically deflected and in the level, normal takeoff, or taxing attitude, whichever is most critical. In addition, for each airplane with conventional landing gear struts using fluid or mechanical means for absorbing landing shocks, there must be positive clearance between the propeller and the ground in the level takeoff attitude with the critical tire completely deflated and the corresponding landing gear strut bottomed. Positive clearance for airplanes using leaf spring struts is shown with a deflection corresponding to 1.5 g.

(b) Aft-mounted propellers. In addition to the clearances specified in paragraph (a) of this section, an airplane with an aft mounted propeller must be designed such that the propeller will not contact the runway surface when the airplane is in the maximum pitch attitude attainable during normal takeoffs and landings.

(c) Water clearance. There must be a clearance of at least 18 inches between each propeller and the water, unless compliance with §23.239 can be shown with a lesser clearance.

(d) Structural clearance. There must be—

(1) At least one inch radial clearance between the blade tips and the airplane structure, plus any additional radial clearance necessary to prevent harmful vibration;

(2) At least one-half inch longitudinal clearance between the propeller blades or cuffs and stationary parts of the airplane; and

(3) Positive clearance between other rotating parts of the propeller or spinner and stationary parts of the airplane.

[Doc. No. 4080, 29 FR 17955, Dec. 18, 1964, as amended by Amdt. 23–43, 58 FR 18971, Apr. 9, 1993; Amdt. 23–51, 61 FR 5136, Feb. 9, 1996; Amdt. 23–48, 61 FR 5148, Feb. 9, 1996]



On Thu, Feb 18, 2021 at 5:08 PM Richard Kaczmarek 3RD <fastlittleairplanes@...> wrote:
Actually depending on who you use for the AW certification prop clearance does matter. The FAA here would not sign off on AW for a tri gear Sonex due to the prop only having a light 5" of clearance. To show us why he had us let the air out on the nose wheel at which point the tips would just miss the ground. Then said "a flat tire just got you a prop strike".

Richard

On Thu, Feb 18, 2021, 7:52 PM Jim Patillo <Logistics_engineering@...> wrote:
ZZzzzzzzzzzz....... I run a 60/72 Catto Prop.
Tailwheel first landing from the beginning, hopefully mains after that. Same prop since 2001. No issues. 
zzzzzzzzzzZZ.

Jim
N46JP Q200



Sent from Outer Space

From: main@Q-List.groups.io <main@Q-List.groups.io> on behalf of gbrighton@... <gbrighton@...>
Sent: Thursday, February 18, 2021 3:02:55 PM
To: main@Q-List.groups.io <main@Q-List.groups.io>
Subject: Re: [Q-List] clearance
 
Chris,
            Im not qualified to answer but 3 inch Prop /Gnd clearance
Doesn't sound  enough ! .. The Flying Q guys are asleep on this one !? ..
Seeing the Exhaust coming out of the Cowling is looking like things are
getting Serious ; )
You let me know on another List that you were intending the use SDS for
Engine management . I was hoping to use the OEM Soob ecu .. anyway long
story short i have 'left' that effort ... !!  ... and have now installed a
SDS ecu .. Gnd running seems good  .. and if weather is ok will be test
Flying it this wkend  .
Graham

.
To: <main@Q-List.groups.io>
Subject: [Q-List] clearance

>
>  What are we looking for in prop to ground clearance?.  Does the Q do a
> flair on landing or does it stay relativley flat?
>
>  With the water line level I have three inch clearance with a 58 inch
> prop. I can cut it down no problem if need be.
>
> thanks -----------  Chris
>
>
>
>



Jim Patillo
 

Jay, here’s the picture of my 60/72 Catto prop you asked about. 

Jim
N46JP Q200



Jay Scheevel
 

Thanks Jim!


On Feb 19, 2021, at 7:54 PM, Jim Patillo <Logistics_engineering@...> wrote:



Jay, here’s the picture of my 60/72 Catto prop you asked about. 

Jim
N46JP Q200


<D08DF108-AC99-4D06-A9DF-536AAC87C6C3.jpeg>

<5A0BFC88-EE3A-447C-88E1-8A9EBEDF7C7E.jpeg>


Chris Walterson
 

Jim----------------  Is that nine inches of clearance with the airplane sitting there or is the tail raised so

water line is level?------------------  Chris


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