loringsrv8(at)COMCAST.NET
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 Posted: Sat Apr 28, 2007 2:54 pm Post subject: RV8-List Digest: 3 Msgs - 04/27/07 |
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Early on in the building process I considered the lower cowl removal problem.
Although opposite to the conventional wisdom, it appears that with the
relatively small intake and exit areas and the large internal volume of the
lower cowl, the pressure below the intake ramps is higher than above. I modified the ramps and the baffling so that the seals were below the ramps and made a tight fit. This was done by shaping the ramp ends with the same curve as the lower cowl and attaching the seal so that it curved up on both ends to meet the upper cowl. The carburator intake was similarly configured. This allowed the cowl to drop straight down without interferance ( I have 1/4" cowl to spinner). The cooling has been entirely mormal. Because the cowl drops free when released, I use a crank up tail hoist with a small cradle attached to do the lowering and raising. As I normally level the aircraft prior to taking the cowl off, the hoist does double duty.
Art Loring, Jr.
RV-8 N211XZ, O320CS, 11.5 hrs.
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| Quote: | -04-27&Archive=RV8
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RV8-List Digest Archive
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Total Messages Posted Fri 04/27/07: 3
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Today's Message Index:
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1. 06:40 PM - spinner to prop clearance (Vince-Himsl)
2. 07:34 PM - Re: spinner to prop clearance (Dick DeCramer)
3. 09:24 PM - Re: Re: spinner to prop clearance ()
________________________________ Message 1
_____________________________________
Time: 06:40:41 PM PST US
From: "Vince-Himsl" <vhimsl(at)adelphia.net>
Subject: spinner to prop clearance
Hello,
The plans say 1/16 to 1/8=94 gap clearance between spinner and prop
(catto
three blade)
My gap(s) are more like 1/8=94 to =BC=94
Are we talking aesthetics here or safety/performance?
Anyone per chance with the same gap (gaffe) and prop?
Thanks
Vince H. Finish
RV8-VSB
Estimated time of completion: 6 years ago.
________________________________ Message 2
_____________________________________
Time: 07:34:15 PM PST US
From: "Dick DeCramer" <diesel(at)rconnect.com>
Subject: RE: spinner to prop clearance
Vince...
Most appear to be going for tighter clearances but I enlarged mine to 7/16"
and
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| Quote: | glad I did. The cowl is difficult enough to get off & on without scratching
the paint now without it being still tighter. I think the feeling here is
some
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[quote] efficiency (performance), mostly aesthetics, but not much maintainability.
My prop was a Sensenich FP but since converted to Hartzell CS.
Another popular close fit is around the tires on wheel fairings to improve
aerodynamics
but I have seen many chaffed tires. I tried for a "thumb width" around
the tire and even enlarged it later to allow the tires room to flex. I did
chose ease of maintenance over a couple knots I built and this has served me
well.
Dick DeCramer
N500DD RV6
200 hours
Northfield, MN
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