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Old Jul 15, 2001, 09:01 AM
Registered User
Stockholm Bromma, Sweden
Joined Mar 2000
141 Posts
Boeing XL-15

I am planning a 1/5 scale model of a Boeing XL-15 Scout for my actro 40-5 and 30 cells. (Test revue in EFI June issue).

The original has got a reversed (upside down) Clark Y-type profile for the stab. I think I know the reason for this but shall I do the same in the model? Any aerodynamical guru´s who can answer this.

Christer Lagerstedt
Haninge, Sweden
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Old Jul 15, 2001, 10:23 AM
Old Timer
California Condor's Avatar
CARMICHAEL, CALIFORNIA USA
Joined Apr 2001
3,839 Posts
DO IT! It is a good way to go. Eut (BS Aero Engigeering, retired)
Quote:
Originally posted by Christer Lagerstedt:
I am planning a 1/5 scale model of a Boeing XL-15 Scout for my actro 40-5 and 30 cells. (Test revue in EFI June issue).

The original has got a reversed (upside down) Clark Y-type profile for the stab. I think I know the reason for this but shall I do the same in the model? Any aerodynamical guru´s who can answer this.

Christer Lagerstedt
Haninge, Sweden
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Old Jul 15, 2001, 01:21 PM
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Sparky Paul's Avatar
Palmdale, CA
Joined Oct 2000
13,202 Posts
It won't make any difference in performance at model sizes which way the stab cambers..
It is an interesting conversation piece.
You should get familiar with why it is done, and then awe the "whuffos" that ask about it.

.
Sparky Paul
PJB's Seriously Aeronautical Stuff
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Old Jul 15, 2001, 02:07 PM
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United States, TX, Fort Worth
Joined Jun 2000
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The stab airfoil is inverted on the Boeing XL-15 for much the same reason as it is on the Lockheed C-130...
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Old Jul 16, 2001, 07:44 AM
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Antioch,CA,USA
Joined Dec 1999
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Howard Metcalf kits an F-4 Phantom with the tail surfaces sanded to the inverted airfoil as well.
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Old Jul 16, 2001, 10:15 AM
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CARMICHAEL, CALIFORNIA USA
Joined Apr 2001
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And the Cessna Cardinal even has slots on it's stabilator that go from the top to the bottom! Tails on conventionally configured full size airplanes must "lift" downward for stability reasons.
Eut
Quote:
Originally posted by Thomas B:
The stab airfoil is inverted on the Boeing XL-15 for much the same reason as it is on the Lockheed C-130...
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