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Post  Kim Sun Nov 13, 2011 9:55 am

First of all, let me point out that I HAVE NOT tried this yet ! It's just another of the goofy "Why Wouldn't Work?" thoughts that bug me when I spend too much time on the Hill.

I hope to get my new/old Cox "Q-Tee" flying this coming week, and intend to use it as a test-bed for the engines that seem to be continuing their migration toward my shop.

They're various sizes, and the larger ones will just get bolted to my aged and faithful Lazy Bee, but the "middle ground" and smaller engines will have to go on the QT. Along with an easily switchable engine mounting system, I'm thinking about installing fixed, but "ground adjustable" flaps to add drag when I need to calm down an un-throttled engine.

When doing full-size aerial photography in a Cessna 150, I use 10 degrees of flaps with power and trim adjusted to make the plane a slow, stabilized platform. I figure that with some cautious experimentation, I should be able to trim the QT, and use the flaps' drag to keep it from trying to go to the moon.

I think that this simple mod wouldn't add much appreciable weight, and using strapping tape for hinges, would allow me to remove all convictable evidence if the experiment turned out to be another crazy idea.

Anyway, thought I'd bounce the idea of this crew to see what you thought. I'm sure it's been done somewhere, sometime before...but this is the first time I'm gonna try it.

Fixed Flaps for "Flying With Your Brakes On" Fixed_10

Later! Kim
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Post  Mudhen Sun Nov 13, 2011 10:20 am

.


Last edited by Mudhen on Sat Nov 06, 2021 10:28 am; edited 1 time in total
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Post  SuperDave Sun Nov 13, 2011 10:27 am

A "prop spoiler/wind resistance" gimick!

What a concept!
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Post  Kim Sun Nov 13, 2011 11:07 am

Mudhen wrote:Interesting...and well written.
But, in your 150, you also have the advantage of controlling power. If the model has no throttle, then I think the flap system will not prevent the tendency of the airplane "to go to the moon." While it may create drag, it still increases wing area and thus lift. Maybe instead of a flap, you could design a spoiler, or even a speed brake. If that's too much, take a page from L. M. Cox and make a "Training Aid Kit."
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Fixed Flaps for "Flying With Your Brakes On" Traini10

YOYKS!!!! THANKS!....I GOT to try that! Maybe make it from ply...even room for a marker-pen logo: "The Wooden Frisbee of Death" !!!!!

Probably still gonna try the flap deal, though. What I forgot to include about the 150's flaps was that, from 20 degrees on, they stop adding lift and just add drag...BUNCHES of it ! That's why in later models like the C-152, the flaps will extend only to 30 degrees, as opposed to 40 degrees on older models. With 40 degrees in a 150, you can REALLY point the nose at the ground without gaining a bunch of airspeed, a great thing when you've got to tuck it into a small field.

However, fledgling pilots, when practicing touch & goes, often forgot to raise their flaps for the following takeoff, and found that their formally friendly trainer would only lift them a few feet in the air at full power! Suffering from sudden brain freeze, many just took a low tour of the runway 'till some substantial object took over the decision-making process.

At 30 degrees, the 152 will, albeit sluggishly, climb IF the weight and temps allow, giving the Junior Birdman at least a chance to get the gray matter back on line and save the day.

So...I figure I could adjust the QT's flaps to eventually find the "Sweet Spot"...but who knows? That's why it's called Experimenting!

Thanks again for idea on the prop disc...it WILL happen !


Last edited by Kim on Sun Nov 13, 2011 11:32 am; edited 2 times in total
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Post  PV Pilot Sun Nov 13, 2011 11:09 am

With this new Super jake I am building, there is a program I can use on my Futaba 7C for flaperons. A adjustable rate setting to allow the ailerons to droop a few degrees in relation to the throttle setting,,the lower the throttle, the more flap ratio is dialed in,,you still have aileron control, bu they droop down to act as flaps.
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Post  Kim Sun Nov 13, 2011 11:18 am

Yeah, with that set-up, you could REALLY do some "envelope exploring"! But the ole QT is gonna stay simple three channel, unless I get another case of crazy and enlarge the thing's plans up to .15 size...now THAT would be cool !
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