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Spinner to cowl clearance - How close is too close

 
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vhimsl(at)adelphia.net
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PostPosted: Fri Jun 01, 2007 5:10 pm    Post subject: Spinner to cowl clearance - How close is too close Reply with quote
Problem:
My spinner to cowl gap / clearance is 1/16 to 3/16 inches. The plans say it should be 3/16” to 1/4” (Rv8)

Questions:
How close is too close? Has anybody had spinner experiences that ‘rubbed’ them the wrong way? Does anyone have any suggestions as to how to avoid doing that?

Thanks!

Vince H.
Sooooo tired of the cowl.
RV8 – VSB Moscow, ID USA
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kboatright1(at)comcast.ne
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PostPosted: Fri Jun 01, 2007 5:31 pm    Post subject: Spinner to cowl clearance - How close is too close Reply with quote
The thing to consider is that you'll want to get the cowl on and off without dinging the paint on the spinner or the cowl. Also, remember that the baffle seal material on the air inlets for cooling air and the carb (if you have one) makes removing and replacing the lower cowl easier if you can slide the cowl forward slightly.

Personally, I'd trim the cowl so the top edge of the bottom cowl has 1/4" clearance. The top cowl *should* lift right off, so you can use less clearance there if it works out that way.

KB
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Larry Bowen



Joined: 09 Jan 2006
Posts: 802
Location: NC, USA
PostPosted: Fri Jun 01, 2007 7:04 pm    Post subject: Spinner to cowl clearance - How close is too close Reply with quote
I would think 1/16" is too close. It will rub at start/shutdown. I have 3/16" I think and I'm glad it's not any less. I try to use towels between the spinner/cowl when removing/installing the cowl.
--
Larry Bowen
Larry(at)BowenAero.com (Larry(at)BowenAero.com)
http://BowenAero.com

On 6/1/07, Vince-Himsl <vhimsl(at)adelphia.net (vhimsl(at)adelphia.net)> wrote:[quote]
Problem:
My spinner to cowl gap / clearance is 1/16 to 3/16 inches. The plans say it should be 3/16" to 1/4" (Rv8)

Questions:
How close is too close? Has anybody had spinner experiences that 'rubbed' them the wrong way? Does anyone have any suggestions as to how to avoid doing that?

Thanks!

Vince H.
Sooooo tired of the cowl.
RV8 VSB Moscow, ID USA
Quote:


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martin(at)gbonline.com
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PostPosted: Fri Jun 01, 2007 7:08 pm    Post subject: Spinner to cowl clearance - How close is too close Reply with quote
Vince,
I fit mine 1/8" minimum-3/16"maximum. A close fit will improve airspeed slightly and looks better. On a new airplane, fit the engine approx. 3/16" high because the engine will sag about that much in the first 100 hours.
Dick Martin
RV8 N233M
1500 hours
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bobbyhester(at)charter.ne
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PostPosted: Fri Jun 01, 2007 7:30 pm    Post subject: Spinner to cowl clearance - How close is too close Reply with quote
I set mine that high and after 65 hrs it is still at the same height, too high. I would set it flush with the top of the cowl.
Quote:
Surfing the web with my laptop from Hopkinsville, KY
Visit my RV7A website: http://webpages.charter.net/bobbyhester/MyFlyingRV7A.htm


dick martin wrote: [quote] st1\:* { BEHAVIOR: url(#default#ieooui) } <![endif]--> Vince,
I fit mine 1/8" minimum-3/16"maximum. A close fit will improve airspeed slightly and looks better. On a new airplane, fit the engine approx. 3/16" high because the engine will sag about that much in the first 100 hours.
Dick Martin
RV8 N233M
1500 hours
Quote:
----- Original Message -----
From: Vince-Himsl (vhimsl(at)adelphia.net)
To: rv-list(at)matronics.com (rv-list(at)matronics.com)
Sent: Friday, June 01, 2007 8:08 PM
Subject: Spinner to cowl clearance - How close is too close



Problem:
My spinner to cowl gap / clearance is 1/16 to 3/16 inches. The plans say it should be 3/16” to 1/4” (Rv8)

Questions:
How close is too close? Has anybody had spinner experiences that ‘rubbed’ them the wrong way? Does anyone have any suggestions as to how to avoid doing that?

Thanks!

Vince H.
Sooooo tired of the cowl.
RV8 – VSB Moscow, ID USA
Quote:


href="http://www.matronics.com/Navigator?RV-List">http://www.matronics.com/Navigator?RV-List
href="http://forums.matronics.com">http://forums.matronics.com


[b]

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vhimsl(at)adelphia.net
Guest
PostPosted: Fri Jun 01, 2007 8:20 pm    Post subject: Spinner to cowl clearance - How close is too close Reply with quote
Thanks All!

I managed to eek out another 1/16” on the top so the spinner to cowl clearance is roughly 1/8” top to 3/16” bottom.

Looks very cool (Catto 3 blade Prop) but I became worried about the interference mainly because the cowl is all done, hinges cemented in place…everything. I even did some custom transition work where the cowl meets the fuselage.
So I went panic mode when it began to look like I would have to rebuild the front of my cowl to get the required clearance as I wasn’t about to try and remove the hinges and start over. I will try and eek out some more space further trimming the spinner but I am already at the backplate.

Even with the tight clearance, I can remove the cowl without removing the spinner. Had some issues with excess baffle material and had to trim the FAB fabricated inlet on the lower cowl, but it does come off. The cowl is pretty tough too considering the number of times I threw it across the garage. ☺

Again, Thanks for the help!

Vince H.




From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Vince-Himsl
Sent: Friday, June 01, 2007 6:09 PM
To: rv-list(at)matronics.com
Subject: Spinner to cowl clearance - How close is too close


Problem:
My spinner to cowl gap / clearance is 1/16 to 3/16 inches. The plans say it should be 3/16” to 1/4” (Rv8)

Questions:
How close is too close? Has anybody had spinner experiences that ‘rubbed’ them the wrong way? Does anyone have any suggestions as to how to avoid doing that?

Thanks!

Vince H.
Sooooo tired of the cowl.
RV8 – VSB Moscow, ID USA
Quote:
http://www.matronics.com/Navigator?RV-List
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ronlee(at)pcisys.net
Guest
PostPosted: Sat Jun 02, 2007 10:27 am    Post subject: Spinner to cowl clearance - How close is too close Reply with quote
I use painters tape.

Ron Lee


[quote]

I would think 1/16" is too close. It will rub at start/shutdown. I have 3/16" I think and I'm glad it's not any less. I try to use towels between the spinner/cowl when removing/installing the cowl.[b]

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