SR-71 Blackbird - Page 3 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 04-22-2006, 11:37 AM   #21
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I've seen very few true scale jets, especially the newer "negatively stable" designs that require a computer to sense what the aircraft is doing and interpret the pilot inputs...

There are some nice flying "sport scale" interpretations that, if you squint one eye, and close the other, look quite close to the real thing. I have a few of these, like the Ultrafly F16 and Parker's F117, both good examples of this compromise.
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Si fractum non sit, noli id reficere - (If it ain't broke, don't fix it).
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Old 04-24-2006, 07:39 AM   #22
Mike Emilio
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SR-71 Blackbird stability question

Well guys, I've been watching everyones input very closely this past week and after almost 30 years of dabbling with planes, I'm truly humbled. The technical logic and interpretations that I've read here is quite superior.

As for the airfoil, Im going to go with the following:
Fins - NACA 0007
Wing inboard - NACA M11 (from the Profili airfoil database)
Wing outboard - NACA 2307 (root) to NACA 6208 (tip)

The outboard panels will be designed around foam core because of the most serious leading edge droop out at the tip - NACA 6208 with 2 deg washout. The blend out is eaier to do in foam, rather than wood.


Well, it turns out that the outboard wing is a heck of a lot more problems than first anticipated. it's now going to be the originally planned NACA 2307 all the way to the tip, with one very nightmareish difference. That incredible drooping leading edge is about 2/3 down the panel only!, then blends upward again to the tip. What a crazy design!
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