Today's Message Index:
----------------------
1. 09:50 AM - Re: Canopy Skirt Buzz... (Speedy11@aol.com)
2. 10:04 AM - Re: Re: Canopy Skirt Buzz... (Matt Dralle)
3. 11:45 AM - Re: Canopy Skirt Buzz... (Vince Himsl)
4. 02:23 PM - Re: Re: Re: Canopy Skirt Buzz... ()
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Subject: | Re: Canopy Skirt Buzz... |
Matt,
I haven't had that problem.
Stan Sutterfield
I'm guessing that all RV-8's must have this issue.
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Subject: | Re: Re: Canopy Skirt Buzz... |
At 09:45 AM 10/31/2010 Sunday, you wrote:
>
>Matt,
>I haven't had that problem.
>Stan Sutterfield
>I'm guessing that all RV-8's must have this issue.
>
Stan,
Wow, really? Do you have anything between the fiberglass skirt and the top of
the turtledeck? Foam, velcro, etc?
Do you have a perfectly tight fit all the way around? I've got a little pooch
on both sides kind of at the center of the concave, roundy part.
One thing I forgot to mention in my original post was that I tried unlatching the
canopy to see what impact it would have. The buzz got even louder.
Another thing I tried was adjusting the Prop RPM. There was definately a relationship
between the buzz and the RPM, not related to speed of the aircraft. A
harmonic of sorts.
Another odd behavior was that when I was climbing out, I didn't hear it at all.
It wasn't until I pushed the nose over and started picking up speed that it
started.
Matt
-
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's RV-8 Construction Log
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: 111+ Hours TTSN - The Fun Never Stops...
Message 3
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Subject: | Canopy Skirt Buzz... |
I use the more expensive p-channel door seal from Home Depot, meaning it is
not. Trick is, I heat the tape glue with a heat gun before applying it. Same
for Velco. Stuff doesn't budge.
You could use the 1/4 inch sound damping foam (sandwich of foil, foam, glue)
from ACS on the underside of the turtle deck to stiffen up it up. Come to
think of it, this may be just that, a turtle deck problem rather than a
canopy skirt problem.
My skirt doesn't buzz either. But then, I used super sound proofing and the
above mentioned foam wherever I suspected 'oil canning' might be a problem.
Regards,
Vince H.
Washington State
RV8 69.5 hours & still stalling on the wheel pants, fairings, and paint.
-----Original Message-----
From: owner-rv8-list-server@matronics.com
[mailto:owner-rv8-list-server@matronics.com] On Behalf Of Matt Dralle
Sent: October 30, 2010 6:12 PM
Subject: RV8-List: Canopy Skirt Buzz...
Hello Listers,
After the very first flight on the RV-8, I discovered that the fiberglass
skirts around the canopy loved to buzz against the turtle deck skin at
anything over about 100mph. To soften the intersection between the skirt
and the skin I added a row of Velcro-brand "loops" tape all the way around
the base of the canopy skirt on the inside including around the bottom of
the windscreen so that when the canopy was closed any skin to skirt areas
were cushioned with a thickness of the Velcro.
That worked great and totally eliminated the buzzing and also sealed up the
cabin nicely. I was pleased.
But, after a Summer in California and 112 hours of flying, the Velcro just
didn't hold up. In the Summer sun, the glue became gooey and the tape
slipped out of position along the curve behind the passenger and looked like
grandma's slip was showing. Along the extreme rear where the skirts come
together and the fit is pretty tight, the glue squeezed out from the heat
and kind of goo-ed all around on the metal.
So, I removed the skirts a couple of weekends ago and literally spend a
whole weekend removing the Velcro and all of the glue. I was lucky and the
in the process I didn't remove any of the textured paint on the skirts or
windscreen frame - whew, that was a scary two days.
This weekend I finally got to take her out for a flight after the oil cooler
replacement (all went fine, btw) and try out the new "tape-less"
installation.
Holy COW!! It was SOOOOOO noisy! At 200mph I took the headphones off and
couldn't believe the DB level. I really couldn't stand the noise level with
the headphone ON, and without then it just plain hurt. I slowed down to
about 150mph and the noise decreased slightly, but not that much. I slowed
down to a stall and finally the buzzing stopped, but as soon as I pushed the
nose over and speeded up a little it started again.
Obviously I'm going to have to put something like the Velco back on the
inside of the canopy frame. But what? I'm guessing that all RV-8's must
have this issue. I surprised there isn't something in the plans to deal
with it. Is there some magic tape/insulator that people are using for this
that will hold up in the heat of the Summer sun?
Thanks in advance!
-
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's RV-8 Construction Blog
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: 112+ Hours Total Time Since May 2 2010 Test Flight!
Message 4
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Subject: | Re: Re: Canopy Skirt Buzz... |
I used some 1/4 inch weatherstriping semmed to seal just fine. Mark
----- Original Message -----
From: "Matt Dralle" <dralle@matronics.com>
<rv7-list@matronics.com>
Sent: Sunday, October 31, 2010 9:59 AM
Subject: RV8-List: Re: Re: Canopy Skirt Buzz...
>
> At 09:45 AM 10/31/2010 Sunday, you wrote:
>>
>>Matt,
>>I haven't had that problem.
>>Stan Sutterfield
>>I'm guessing that all RV-8's must have this issue.
>>
>
> Stan,
>
> Wow, really? Do you have anything between the fiberglass skirt and the
> top of the turtledeck? Foam, velcro, etc?
>
> Do you have a perfectly tight fit all the way around? I've got a little
> pooch on both sides kind of at the center of the concave, roundy part.
>
> One thing I forgot to mention in my original post was that I tried
> unlatching the canopy to see what impact it would have. The buzz got even
> louder.
>
> Another thing I tried was adjusting the Prop RPM. There was definately a
> relationship between the buzz and the RPM, not related to speed of the
> aircraft. A harmonic of sorts.
>
> Another odd behavior was that when I was climbing out, I didn't hear it at
> all. It wasn't until I pushed the nose over and started picking up speed
> that it started.
>
> Matt
>
>
> -
> Matt Dralle
> RV-8 #82880 N998RV
> http://www.mattsrv8.com - Matt's RV-8 Construction Log
> http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
> Status: 111+ Hours TTSN - The Fun Never Stops...
>
>
>
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