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Not too bad, upper 50s, moist for sure but didn't rain.
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[QUOTE=polix;23390551]I've done it, it works (i tried it on my Icon A5), but it puts serious stress on your servos, so make sure they're good servos. I think i actually set mine at about 70 degrees are so, and i set them as flaps down, NOT up. I basically glided in, cut my throttle to 25%, hit max flaps, then cut throttle completely. If you're a numpty like me you'll want to test this at increasing levels until you're comfortable with the sudden effect on your plane. Keep in mind you'll get a slight vertical bump unless your flaps are at a true 90%[/QUOTE
Thanks mate, I'd much prefer to try full 90 degree flaps down than risk a reversable motor... sounds promising |
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I'm not sure about reversible motors, you'd need an ESC that is compatible (like an ESC for a car perhaps), but if you get all funky in your flying i know that you can purchase adjustable angle pitch propellers, some will even let you switch into reverse pitch on a dime (since it's servo controlled).
I'm sure if i tried this it would lead to tears, so i just won't, but if you do let me know! |
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the easiest way would be a reversible prop but I dont think they make them for the thrust that this thing runs on. It would blow apart... A reversible motor would not nearly give as much braking as you would think... the props will give great thrust one way...
I tested a 8x4 prop with it correct and reversed on a 150W motor and it was astonishing! This was not running a prop as a pusher but simply reversing the motor with the same prop in the same configuration. Correct: 730g Reversed: 220g Chris |
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AJ |
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Try it... throw a prop on a motor, run it the correct direction, and then run the prop "backwards" it is way more than 10% difference. did you notice we were talking about reversing the motor to slow the plane? not mounting a prop backwards...
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I'd reckon you'd be on the money, I played around with this idea a few months ago using a car ESC, but havent had the intenstinal fortitude to try it I think I'll chicken out and stick with 90 degree flaps as spoilers/air brakes |
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Are you guys talking about how long this thing floats ?? Like it takes forever to land.? I have just started bringing it down,and keep bringing it down flaps at about 55% keep giving it down and land. if you don't keep giving it down elevator she will glide forever
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And the plane can fall out of the sky if you bring the nose up, or even level, with reverse thrust going. Unlike flaps, reversing the thrust provides no additional lift. And the backward push it gives you, does NOT diminish as the plane slows down. It's a stall waiting to happen. Can be done, but it's tricky. Adding to the problem, is that most car ESCs that are reversible, can only take a 2s or 3s battery (some can take 4s). Boat ESCs that are reversible, can often handle more cells, but they usually need watercooling. I was thinking about reversing the thrust on my SSS before I got the present motor/ESC setup, but gave it up when I cound't find a reversible ESC that could handle 5 or 6 cells. So I gave it up and got a normal Hobbywing ESC that can handle six cells, but has no reverse. Naturally, a week after it arrived, I ran across a few reversible car ESCs that could handle 6 cells. https://www.hobbyking.com/hobbyking/s..._Car_ESC_.html (ad mentions reverse types) https://www.hobbyking.com/hobbyking/s...s_Car_ESC.html (manual describes reverse programming) And one car ESC that handles 6s batteries, but no reverse mentioned: https://www.hobbyking.com/hobbyking/s...s_Car_ESC.html |
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Last edited by Little-Acorn; Nov 29, 2012 at 12:54 PM.
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even simply digital trim to get a little reverse, i dont think you would need full throttle reverse, I reckon to many reverse rpm's will induce a bunch of cavitation, possibly violent vibrations, realistically you only need a little reverse |
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So if you are needing to dump lift because it glides too long, why not reverse the flaps? Flip them up rather than down... More drag, less lift...
You could set this on a spring switch (like the TH9x Trainer SW) and then have normal flaps that can be engaged as usual. Many airliners have the flaps and then can open between the wing and flap to reduce lift. A little extreme for our planes but simply raising the flaps rather than lowering them would in theory increase drag and decrease lift... Chris |
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