Today's Message Index:
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1. 03:54 PM - Re: RV8-List Digest: 3 Msgs - 04/27/07 (loringsrv8@COMCAST.NET)
2. 08:07 PM - Wind Root Fairings - Nutplates (Brian Cross)
Message 1
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| Subject: | Re: RV8-List Digest: 3 Msgs - 04/27/07 |
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.
-------------- Original message ----------------------
From: RV8-List Digest Server <rv8-list@matronics.com>
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> ----------------------------------------------------------
> RV8-List Digest Archive
> ---
> Total Messages Posted Fri 04/27/07: 3
> ----------------------------------------------------------
>
>
> Today's Message Index:
> ----------------------
>
> 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@adelphia.net>
> Subject: RV8-List: 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@rconnect.com>
> Subject: RE: RV8-List: spinner to prop clearance
>
> Vince...
>
> Most appear to be going for tighter clearances but I enlarged mine to 7/16"
and
> 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
> 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
>
>
> ----- Original Message -----
> From: Vince-Himsl
> Sent: 4/27/2007 8:49:53 PM
> Subject: RV8-List: spinner to prop clearance
>
>
> Hello,
>
> The plans say 1/16 to 1/8 gap clearance between spinner and prop (catto three
> blade)
>
> My gap(s) are more like 1/8 to
>
> 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 3
> _____________________________________
>
>
> Time: 09:24:43 PM PST US
> From: <jhstarn@verizon.net>
> Subject: Re: RE: RV8-List: spinner to prop clearance
>
>
> Seven years ago the HRII (IO-540) was ready for the cowl/spinner clearence
> question.
> I ask on line and was advised to leave at least 1/4 at the top & 7/16 at
> the bottom so when the "sag" occured they would even out. This was reportedly
> because of the "extra" weight of six cylinders & longer monment. Well six
years
> later I'm still waiting for the "sag" to even up the gap. Not sure how many
> 1/1000th's of a MPH we lost because of the gap BUT take a look at the spam
cans
> (Comanche's) gap & SMILE. KABONG Do Not Archive
>
>
> >From: Dick DeCramer <diesel@rconnect.com>
> >Date: 2007/04/27 Fri PM 09:33:43 CDT
> >To: rv8-list@matronics.com
> >Subject: RE: RV8-List: spinner to prop clearance
>
> >Vince...Most appear to be going for tighter clearances but I enlarged mine to
> 7/16" and 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 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 improveaerodynamics but
> I have seen manychaffed 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
> ofmaintenance
> over a couple knotsI built and this has served me well. Dick DeCramerN500DD
> RV6200 hoursNorthfield, MN----- Original Message ----- From: Vince-Himsl
> To: rv8-list@matronics.comSent: 4/27/2007 8:49:53 PM Subject: RV8-List:
> spinner to prop clearance
> >
> >Hello,
> >
> >The plans say 1/16 to 1/8 gap clearance between spinner and prop (catto three
> blade)
> >
> >My gap(s) are more like 1/8 to
> >
> >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
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| Subject: | Wind Root Fairings - Nutplates |
Hi Folks
I was working on my wing root gap fairings on my 8 today. Where the
fairing is screwed onto the top & bottom wing skin, the plans on Dwg.
43 call for a K1000-08 nutplate & to machine countersink the
skins. In the wing tank area where the gap seals are attached to the
tank skins, the plans call for K11000-08 nut plates. This would of
course call for dimpling the skins to accept the AN509-8R8 screws, (
the same screw called out for the K1000-08 nutplates).
This does not seem right to me as the countersink depth from the top
of the screw to the end of the taper on the screw is about
0.080". This means that if you machine countersink the skins which
total about 0.050" in thickness, the holes are going to be huge all
the way through both skins, ( the holes will largest of course at the
outer skins & the inner skin will have a smaller but still a significant size).
It seems to me that all of these areas should be dimpled due to the
thinness of the total material. The documentation indicates for the
tank area, the skins be dimpled first & then if required, machine
countersink to complete it if the necessary dimple depth cannot be attained.
To add further confusion, I looked at my preview plans with the last
update of July 1998, all of these areas were specified to have
K1100-08 nutplates which as mentioned, to me that makes total sense.
I am obviously missing something here & would really appreciate any
help on this. Maybe I am being too fussy but I don't want to mess up
my wing skins at this stage of the game.
Thanks so much.
Brian Cross #81844 RV-8
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