1. Messages
  2. prop size?

Re: prop size?

Peter Harris <peterjfharris@...>
 

Steve the limiting factor will probably be the diameter. The largest diam
will be most efficient. If you decide Warp Drive best to go for the largest
diam. ie 60" for a Q Dragger; ? for the triQ. Then adjust pitch so you get a
satisfactory ground run RPM say 4500rpm.-5000rpm , then go fly. Test and
keep adjusting prop pitch until you get 5500 rpm at WOT level flight.

Note that the CF blades are more easily broken than a wood prop.and more
prone to vibration.

Peter





_____

From: Q-LIST@... [mailto:Q-LIST@...] On Behalf Of
Steve Ham
Sent: Monday, 5 June 2006 10:41 PM
To: Q-LIST@...
Subject: RE: [Q-LIST] Re: prop size?



I think Jon Finley was running a three blade warp drive. You might try to
contact Reg Clarke at Air-Soob. He has a lot of experience with Soob's.
There are some RV 6s running Suburu's. Might try their group. Hope this
helps.



Steve Ham

-----Original Message-----
From: Q-LIST@... [mailto:Q-LIST@...] On Behalf Of
Ron Weiss
Sent: Monday, June 05, 2006 1:29 AM
To: Q-LIST@...
Subject: [Q-LIST] Re: prop size?



--- Relax Steve, My attempt at humor wasen't very funny. However
here's my dilemma. In the last couple of weeks I've been trying to
get info on the airsoob site. I have a Subie-Lyc 2.2. Apparently no
one with this set up has logged on in the last couple of weeks
because all the info I can get is that some reduction units don't
like 2 bladed wood props(harmonic issues). One guy used a Prince and
liked the performance, but, there was this vibration? He seemed to
like his Warp Drive, however, it didn't perform as well! Still, I
didn't get measurements for my motor( diameter, pitch, breast size)?
I've been to many different propeller websites with the same "aren't
really sure" answer. Catto even flatly refused and sent me to
Prince! A@P's seem to twitch when I mention Subaru. I don't mind
paying for information, but, I can't seem to find any. Leon sent me
a "prop size sheet" that didn't get through. Finley's website won't
come up, however, I do recall very few specs, mostly set up. I do
remember him running or ran a Warp Drive. So, if anyone comes across
a high performance airplane with a Subaru 2.2 in the nose, if you
could please take a moment and ask him or her....What size prop are
you running? I'd really appreciate it! Ron
In Q-LIST@..., "Steve Ham" <sham@...> wrote:

Take a chill pill Ron, the concept of this list is for experienced
opinions.
If you need a direct answer, there are other sources. A&Ps,

IAs, reference books ect..but of course those will cost you.



Steve Ham



-----Original Message-----
From: Q-LIST@... [mailto:Q-LIST@...] On
Behalf Of
Ron Weiss
Sent: Sunday, June 04, 2006 8:05 PM
To: Q-LIST@...
Subject: [Q-LIST] Re: prop size?



--I just asked for help with the size. My fears, irrational or
not ,
are mine. I would appreciate a direct answer. If you don't have
one,
well, you know what they say about opinions....Ron - In Q-
LIST@..., "JohntenHave" <johntenhave@> wrote:

Ron,

this just does not make a lot of sense. I know of Quickies that
have
crashed. Using this logic, I should not fly one. Metal and
composite
props fail too. If they failed they were either improperly
designed,
improperly built or misused. You may also wish to out for
yourself
what damage was done to the engine, post failure. Unless you
intend to
repeat the mistakes of the past, find out why those failed,
remove
that failure mode, get a prop made by a reputable builder and
fly
it
with confidence.

Nervous is fine - it keeps you alive, irrational fear prevents
living.

John
Sydney



--- In Q-LIST@..., "Ron Weiss" <ronweiss4@> wrote:

-Sorry Guy's, Brain Fart! Still, I know of two that have
failed.
Makes me nervous....Ron-- In Q-LIST@..., "Peter
Harris"
<peterjfharris@> wrote:

Ron as I understand your first post you will be running a
2:1
reduction so
that 5500 engine rpm will correspond to 2750 prop rpm which
is
fine. The
prop will start to lose efficiency above 3500rpm. Running
5500
prop rpm is
not for happy props.

Peter



_____

From: Q-LIST@... [mailto:Q-LIST@...]
On
Behalf Of
Ron Weiss
Sent: Saturday, 3 June 2006 2:56 PM
To: Q-LIST@...
Subject: [Q-LIST] Re: prop size?



--I'm not comfortable with a wood prop spinning so quickly
on
a
165
hp. at 5500 rpm's. Besides, my two closest quickie buddies
both
through wood props! Both are here to tell their stories,
but,
I'm
not willing to take that chance....Ron- In Q-
LIST@..., "JohntenHave" <johntenhave@> wrote:

Ron,

I second Peter's comments and unless you have an
overpowering
predjudice against natural composites, suggest that you
consider
the
following :

Gyroscopic loads

post propstrike consequences

chances of getting the prop exactly right first try

repairability away from home

ability to fabricate replacements



John












--- In Q-LIST@..., "Peter Harris"
<peterjfharris@>
wrote:

Ron why no wood props? They seem to be the most used.

Peter



_____

From: Q-LIST@... [mailto:Q-
LIST@...] On
Behalf Of
Ron Weiss
Sent: Friday, 2 June 2006 5:56 PM
To: Q-LIST@...
Subject: [Q-LIST] Re: prop size?



--Thanks Leon,I'll let you know if I need anymore
info....Ron-
In Q-
LIST@..., "Leon - C" <leon@> wrote:

Run the numbers through David Gall's Excel sheet for
props.
I'm
sure it's posted some where - maybe even on his site.
If
not
I
can
E-mail a copy.

Assuming 165 mph = 84 inch pitch and 76 inch dia.
==============
Leon
----- Original Message -----
From: Ron Weiss
To: Q-LIST@...
Sent: Thursday, June 01, 2006 8:39 PM
Subject: [Q-LIST] prop size?


Does anyone have a suggested size prop I should run
on
a
Subaru
EJ 22,
165hp. at 5500rpm. 2 to 1 reduction. No pure wood
props
please....Ron






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