Re: N275CH First Flight Q200


Peter Harris <peterjfharris@...>
 

James,
I had trouble with the plans type vent because it plugs with fuel when air pressure is equal to gravity (at about 90mph climb). This caused the Revmaster/Posa to almost cut out. That is why I fitted a simple short up facing vent on top of the cowl to vent the header tank.
This short vent clears immediately if ever it gets blocked with fuel.
Jim P has also reported a fuel starve problem with the plans vent affecting the standard 0-200 set up with gravity feed so it must have almost emptied the fuel bowl in that case. Others may not be aware that their fuel supply is compromised and does not meet the flow test when the vent is blocked, and it takes time to clear itself.If you have a fuel bowl running low it affects the mixture and could cause power surges as in Jim's case.
I believe the plans vent should be scrapped it is a bad design. It is very easy to replace it with a short foolproof header vent pointing up.
I made the mistake of following plans advice to terminate the short header vent inside the return pipe and therefore I get occasional fuel blown onto the canopy. The short header vent should be terminated clear of the return pipe preferably on the passenger side of the cowl.
The addition of an in-line pump is further insurance in case of a leak in the fuel cap.
Peter

----- Original Message -----
From: James Postma
To: Q-LIST@...
Sent: Thursday, April 28, 2005 1:04 PM
Subject: Re: [Q-LIST] Re: N275CH First Flight Q200


Peter,

The plans type vent goes under the fuselage and spills on the ground. I did
this yesterday. If you have your vent on top, you can terminate at the top
of the tank as it can not plug with fuel.

James
----- Original Message -----
From: "Peter Harris" <peterjfharris@...>
To: <Q-LIST@...>
Sent: Thursday, April 21, 2005 3:44 AM
Subject: Re: [Q-LIST] Re: N275CH First Flight Q200


>
> James the vent terminating in the overflow causes another problem. When
> the main is full, fuel is forced UP the overflow and into the vent Even
> pilot weight on the seat makes it act like a bellows forcing fuel up the
> return pipe. I terminated my header vent into the return pipe and fuel is
> forced out onto the canopy.
> Bad design.
> Peter
> ----- Original Message -----
> From: James Postma
> To: Q-LIST@...
> Sent: Thursday, April 21, 2005 3:01 PM
> Subject: Re: [Q-LIST] Re: N275CH First Flight Q200
>
>
> the Q200 plans show the vent should be terminated into the overflow. The
> Q2
> did not have this. If you do not have the vent into the overflow, you
> should not have the header tank completely full. Fill the header tank at
> the pump and then turn the transfer pump off. Do not transfer fuel until
> after takeoff.
>
> James Postma
>
> ----- Original Message -----
> From: "Peter Harris" <peterjfharris@...>
> To: <Q-LIST@...>
> Sent: Monday, April 18, 2005 3:43 AM
> Subject: Re: [Q-LIST] Re: N275CH First Flight Q200
>
>
> >
> > Kevin congratulations on the way you handled the flight and for the
> > positive attitude to solve the glitch.
> > I had similar power surge with a gravity fed Revmaster caused by fuel
> in
> > the plans built vent. . Under certain conditions at about 90mph on
> climb
> > fuel will remain in that particular fuel vent as gravity works against
> ram
> > air. The vent is too long and it points down. There will be no sign of
> the
> > problem on the ground. I fitted a short vent upward facing and have had
> no
> > further problem.
> > In an 0-200 the effect would cause fuel level variations in the bowl
> > affecting mixture but power surge has not been reported before.
> > <Fuel vent: Checked before and after flight. Not hard plugged but who
> > knows
> > if fuel plugged it on this flight
> >
> > Flow check header tank in flight position: Not in flight position but
> it
> > did
> > flow like a racehorse with the tail on the ground. (I rechecked this as
> > soon
> > as I got it back to the hangar.) Actual flow I don't know.>
> >
> > Peter
> >
> > -----Original Message-----
> > From: Q-LIST@... [mailto:Q-LIST@...] On Behalf
> Of
> > Jim Patillo
> > Sent: Sunday, April 17, 2005 10:36 PM
> > To: Q-LIST@...
> > Subject: [Q-LIST] Re: N275CH First Flight Q200
> >
> >
> >
> >
> > Kevin,
> >
> > Congratulations you're still alive to tell the story. Some have not
> > been so lucky.
> >
> > Do you have a gascolator? Do you have fuel lines running between the
> > carb and oil tank? Do you have heat sleeve over the fuel lines? Do
> > you have an aux tank? How much fuel did you have on board? Are you
> > sure your ram air to header was free and clear and not blocked by
> > fuel or some foreign matter? Was the header fuel flowed at the carb
> > in flight position (tail off, fuselage on the mains and split line on
> > the deck)prior to flight? If so what was the flow in gallons per
> > hour? Could you have had carb ice? Did you allow the engine to heat
> > soak prior to flight?
> >
> > A lot of 0200 engines are much harder to turn over when they are
> > hot. What you experienced may be normal especially if your temps were
> > very high. Are you around anyone that can verify this condition?
> >
> > Don't let this mishap deter you. I had a vapor lock at 60 hours
> > and the engine quit at about 150' off the ground in front of the
> > tower. I was able to get it around the pattern just as you did
> > by "pumping the throttle". I discovered the gascolator caused a vapor
> > lock, I shit canned it and the rest is history.
> >
> > Regards,
> >
> > Jim Patillo
> >
> > --- In Q-LIST@..., "Kevin Fortin" <kfortin@p...> wrote:
> >> Hey guys,
> >>
> >>
> >>
> >> Got N275CH off the ground for the first time and got a few other
> > firsts as
> >> well:
> >>
> >>
> >>
> >> First engine malfunction
> >>
> >>
> >>
> >> First declared emergency
> >>
> >>
> >>
> >> First time in the dirt (mud)
> >>
> >>
> >>
> >> All this took 60 or so seconds.
> >>
> >>
> >>
> >> The good news is only the airplane and the pilot got muddy.
> >>
> >>
> >>
> >> In a nutshell, I did three fast taxis, felt about as good as you
> > can for
> >> your first shot into the air, then decided to give her a go. I
> > lined up on
> >> the runway, hit the throttle and the takeoff went as much per plan
> > as I
> >> could expect. Then after about 10 seconds and at about 100 feet the
> > engine
> >> acted like it ran out of gas. Oh shit. I put the nose down, declared
> >> emergency, and started heading back to the runway which at this
> > point was
> >> obviously too short for the job at hand. Hoping for a plan B, I hit
> > the
> >> throttle, the engine revved up, then slowed again after a few
> > seconds.
> >> Seeing a connection there I kept pumping the throttle enough to get
> > her back
> >> in the air and around the pattern for my "first" landing. Let's say
> > the
> >> approach was not textbook but I got her back to the ground without
> > any
> >> bounces or anything I could complain about. I let it roll out for a
> > bit and
> >> then started braking. This is where the adrenaline of the situation
> > got the
> >> better of me. I braked too hard and it started pulling a bit to the
> > right.
> >> When I realized how hard I was braking I let off of the brake
> > (Johnson bar)
> >> then ka-wam, I was headed for the other side of the runway. Damn, I
> > was just
> >> thinking I was going to pull the stunt off. Except for the
> > embarrassment,
> >> all was OK.
> >>
> >>
> >>
> >> Yesterday, and at this point, I am thinking the engine had gotten
> > hot enough
> >> that fuel was boiling in the carb.
> >>
> >>
> >>
> >> Today, to try to reproduce the problem, I tied the tail down and
> > ran the
> >> engine until the oil temp was 190 F, the previous day's takeoff oil
> > temp.
> >> This was when I noticed what may the real problem. After shutting
> > down, when
> >> I tried to move the prop, it moved with a lot of friction. I
> > quickly removed
> >> the cowl and the sparkplugs to take away the
> > compression "resistance" and
> >> found the engine was still hard to turn. Not knowing what to do I
> > figured
> >> lunch was in order. When I got back from lunch, and the engine had
> > cooled
> >> and it turned as light as I had known it before.
> >>
> >>
> >>
> >> Any ideas of what might cause this "hot" friction? In any case I
> > bet an
> >> engine teardown is in my future.
> >>
> >>
> >>
> >> Kevin
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >
> >
> >
> >
> >
> >
> > Quickie Builders Association WEB site
> > http://www.quickiebuilders.org
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > Quickie Builders Association WEB site
> > http://www.quickiebuilders.org
> >
> >
> >
> >
> >
> >
> > --------------------------------------------------------------------------------
> >
> > Yahoo! Groups Links
> >
> > a.. To visit your group on the web, go to:
> > http://groups.yahoo.com/group/Q-LIST/
> >
> > b.. To unsubscribe from this group, send an email to:
> > Q-LIST-unsubscribe@...
> >
> > c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of
> > Service.
> >
> >
> >
> >
> >
> >
> >
> >
> > Quickie Builders Association WEB site
> > http://www.quickiebuilders.org
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
>
>
>
> Quickie Builders Association WEB site
> http://www.quickiebuilders.org
>
>
>
>
>
> ------------------------------------------------------------------------------
> Yahoo! Groups Links
>
> a.. To visit your group on the web, go to:
> http://groups.yahoo.com/group/Q-LIST/
>
> b.. To unsubscribe from this group, send an email to:
> Q-LIST-unsubscribe@...
>
> c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of
> Service.
>
>
>
>
>
>
>
>
> Quickie Builders Association WEB site
> http://www.quickiebuilders.org
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>



Quickie Builders Association WEB site
http://www.quickiebuilders.org





------------------------------------------------------------------------------
Yahoo! Groups Links

a.. To visit your group on the web, go to:
http://groups.yahoo.com/group/Q-LIST/

b.. To unsubscribe from this group, send an email to:
Q-LIST-unsubscribe@...

c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.

Join main@Q-List.groups.io to automatically receive all group messages.