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williamtsullivan(at)att.n
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 Posted: Fri May 28, 2010 6:39 am Post subject: Re drag conundrum |
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Thom- You wanted a dumb, cheap idea- try this. On the front of the gear legs, tape some tubing of a smaller diameter than the leg, just to break up the air flow. Maybe some plastic loom? This would help imitate the effect of a fairing enough to see if you are on the right track. 15 minutes and no cost to try, and 2 minutes off.
Bill Sullivan
Windsor Locks, Ct.
FS 447
[quote][b]
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by0ung(at)brigham.net
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| Posted: Fri May 28, 2010 7:51 am Post subject: Re drag conundrum |
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Thom- You wanted a dumb, cheap idea- try this. On the front of the gear legs, tape some tubing of a smaller diameter than the leg, just to break up the air flow. Maybe some plastic loom? This would help imitate the effect of a fairing enough to see if you are on the right track. 15 minutes and no cost to try, and 2 minutes off.
Bill Sullivan
>>>>>>>>>>>>>>>>>>>>>>>
bill and Thom
from what I have heard it is not how you open up the airspace that has the biggest effect on drag. but how you close it. for a test I would cut some styrofoam with an inverted round on the front,( to fit the gear leg) and cut the trailing edge to a point. Wrap it with some fabric and glue the fabric to the gear leg.
Boyd young
MKIII
[quote][b]
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Dana
Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA
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| Posted: Fri May 28, 2010 9:05 am Post subject: Re drag conundrum |
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At 10:29 AM 5/28/2010, william sullivan wrote:
| Quote: | | Thom- You wanted a dumb, cheap idea- try this. On the front of the gear legs, tape some tubing of a smaller diameter than the leg, just to break up the air flow. Maybe some plastic loom? This would help imitate the effect of a fairing enough to see if you are on the right track. 15 minutes and no cost to try, and 2 minutes off. |
Drag reduction from adding streamlined fairings works by guiding the airflow behind the tube, preventing separation. Adding material in front of the tube won't do much if anything.
-Dana
--
Censorship: The reaction of the ignorant to freedom. [quote][b]
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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Fri May 28, 2010 10:40 am Post subject: Re: Re drag conundrum |
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A few decades ago, I saw an airplane, a Maule if my memory is correct, with the trailing part of a wheel pant only, as designed. The nose part was just the tire itself. I have no idea how well it worked but thought that was good idea for very light weight and probably somewhat effective. It was held on just on the inboard side and was closed in the front, very close to the tire surface. Made for a decent mud flap too without all the interior space to catch and hold the mud. If I didn't already have the full wheel pants I'd probably try that.
My thought for fairing the gear leg is to use perhaps .020" clear polycarbonate (Lexan) sheet. I want to have visual and maintenance access to the brake lines running down the back of the gear legs. My pan is to cut small holes in the polycarbonate near the gear tube, top and bottom, and secure the fairing with zip ties. If the trailing edges tend to flap open, then I can sew them shut. This is plan A. Who knows how many plans it will take to get what I'm happy with?
I'm not a builder but I am an experimenter.
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_________________
Thom Riddle
Buffalo, NY (9G0)
Don't worry about old age... it doesn't last very long.
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Jason Omelchuck
Joined: 07 May 2009
Posts: 120
Location: Portland Oregon
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Richard Pike
Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee
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| Posted: Fri May 28, 2010 12:53 pm Post subject: Re: Re drag conundrum |
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Kolb lift strut fairing scraps work too -
http://www.bcchapel.org/pages/0003/pg2.htm
Richard Pike
MKIII N420P (420ldPoops)
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