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evmeg(at)snowcrest.net
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 Posted: Fri Oct 24, 2008 6:16 am Post subject: dimple speed mods |
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Has anybody on the list ever experimented with dimple tape? Below you will find a link to an article written in sport aviation back in 98. They claim a 10 mph speed increase on an RV3 and half of the propeller noise. With the speed increase and noise reduction claimed I have to wonder why I dont see this on almost all airplanes...makes it a bit suspect. Still if it's real I would want to know...cheap speed mod.
Evan
http://www.dimpletape.com/article.htm
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n1cxo320(at)salidaco.com
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| Posted: Fri Oct 24, 2008 8:44 am Post subject: dimple speed mods |
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Yes, I was suckered into trying it. I put it on the Warnke wood prop on my Rv6A and the max RPM which had been 2550 was now 2800 and he throttle wasn't even full open.
The tape reduced speed to a dangerous level with significant handling reducing qualities.
I took it off after one dangerous flight and threw it in the waste can where it belonged.
The Warnke prop may be operating near stall normally and the tape put it over the edge, anyway the tape was a joint buy with another pilot who had poor results and stopped trying it also.
FWIW
\John
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JFLEISC(at)aol.com
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| Posted: Fri Oct 24, 2008 1:36 pm Post subject: dimple speed mods |
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I got the same results as John. I actually made a jig and dimpled the wood prop. The speed did go up but it was because the RPM increased just as John's did. Problem was that I was now over revving the engine and I didn't want to do that. By that time Sensenich came out with the metal fixed pitch prop for the 0-360 and I went with that. Better speed at normal RPM.
Jim
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DanFM01(at)butter.toast.n
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| Posted: Sat Oct 25, 2008 8:47 am Post subject: dimple speed mods |
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On Fri, 2008-10-24 at 10:43 -0600, John Fasching wrote:
| Quote: | Yes, I was suckered into trying it. I put it on the Warnke wood prop
on my Rv6A and the max RPM which had been 2550 was now 2800 and he
throttle wasn't even full open.
The tape reduced speed to a dangerous level with significant handling
reducing qualities.
|
Sounds like the tape may have been working but you would need a higher
pitched prop to use it. Obviously it's not practical for the average
person to obtain a selection of props to experiment with. I wonder if
it might work better with a constant speed.
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evmeg(at)snowcrest.net
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| Posted: Sat Oct 25, 2008 4:46 pm Post subject: dimple speed mods |
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Thanks guys! I kinda figured it was too good to be true. There is always a
trade off.
Cheers..
Evan
Message -----
From: "Dan Morrow" <DanFM01(at)butter.toast.net>
To: <rv-list(at)matronics.com>
Sent: Saturday, October 25, 2008 9:46 AM
Subject: Re: dimple speed mods
| Quote: |
On Fri, 2008-10-24 at 10:43 -0600, John Fasching wrote:
> Yes, I was suckered into trying it. I put it on the Warnke wood prop
> on my Rv6A and the max RPM which had been 2550 was now 2800 and he
> throttle wasn't even full open.
>
> The tape reduced speed to a dangerous level with significant handling
> reducing qualities.
Sounds like the tape may have been working but you would need a higher
pitched prop to use it. Obviously it's not practical for the average
person to obtain a selection of props to experiment with. I wonder if
it might work better with a constant speed.
|
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Checked by AVG - http://www.avg.com
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