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                           Glasair-List Digest Archive
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                     Total Messages Posted Sun 10/15/17: 2
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Today's Message Index:
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     1. 08:39 AM - Wing root fairing ideas (for speed)?  (mppalmer@aol.com)
     2. 11:35 AM - Re: Wing root fairing ideas (for speed)?  (robin02@mindspring.com)
 
 
 
________________________________  Message 1  _____________________________________


Time: 08:39:58 AM PST US
From: mppalmer@aol.com
Subject: Glasair-List: Wing root fairing ideas (for speed)?


So, after 20 years of flying our Glasair I + I/II (short Glasair 2 fuselage on
a Glasair I wing), I've noticed that we don't get any bugs on the inside half
of the horizontal stabilizer. 

The bug line is coincident with a tangent from the widest part of the fuselage
back to the horizontal stabilizer.  This makes me think that I'm carrying a big
wake aft of the wing/fuse intersection.

I saw a Glasair 1 guy's ad on Barnstormers where he had added a custom wing root
fairing and claimed a 25 mph increase in speed. (That was an RG with 200 hp.
And a narrower Glasair 1.)  So I'm thinking of rolling my own.

There seem to be two approaches to cleaning up the airflow back there. The less
intense version is to drop a vertical from about half way up the fuselage to
the wing (to straighten out the fuselage) and then figure out how to fair the
part after of the flap. (Usually with a horizontal fence after of the flap.)

The other version is to make a Spitfire type fairing, a longish, curved fairing
that goes to a large radius as it goes back. (To keep the airflow attached to
both fuse and wing.)

So far I'm opting for the Spitfire version.

Here's a link to a photo of my first try.

https://s1.postimg.org/19w907fywv/fairing.test.jpg

[url=https://postimg.org/image/674pu1tqpn/][img]https://s1.postimg.org/674pu1tqpn/fairing.test.jpg[/img][/url]

But I thought I would ask you all if anyone has a better/simpler idea before I
try this for real. 

(I'm surprised that Jeff LaVelle doesn't have an obvious wing root fairing on his
Reno winning Glasair III.)

Mike Palmer <><


________________________________  Message 2  _____________________________________


Time: 11:35:55 AM PST US
Subject: Re: Glasair-List: Wing root fairing ideas (for speed)?
From: "robin02@mindspring.com" <robin02@mindspring.com>


Mike, did you fly a tuft test to give you a visual on where separation takes place?
RobinSent from my Verizon LG Smartphone


 

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