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Old Nov 27, 2012, 10:18 PM
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Originally Posted by NorCalMatCat View Post
https://www.youtube.com/watch?v=1d1C...ure=plpp_video

My buddy FINALLY posted the video of him chasing me while he was flying FPV!!!

You can see the chases directly @2:20, @8:27, @13:35
thanks man,looked like a fun fly also looked cold and rainy
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Old Nov 27, 2012, 10:20 PM
Better then Sliced Bread!
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Not too bad, upper 50s, moist for sure but didn't rain.
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Old Nov 28, 2012, 12:32 AM
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Thanks Onewire! Appreciate it. Now I know how.
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Old Nov 28, 2012, 09:35 PM
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Originally Posted by AussieHoppy View Post
curiousity question- has anyone tried flaps down at something like 90 gegrees to act more like airbrakes? or 90 deg flaps up?
with my other electronics i'm all outa channels so crow etc is out of the equation, just looking at alternatives
reversable motor still intrigues me, but kinda... nervous... to try lol
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%
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Old Nov 29, 2012, 12:01 AM
what goes up, must come down..
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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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Old Nov 29, 2012, 12:52 AM
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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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Old Nov 29, 2012, 01:05 AM
Mobius Cables... I got em'
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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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Old Nov 29, 2012, 01:17 AM
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Originally Posted by chanyote66 View Post
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
You'd need a reversible cowl (sp?) like on a jet engine where they hit a button and the rear of the jet reverses the direction of the thrust of the engine. That would be cool.
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Old Nov 29, 2012, 01:23 AM
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Quote:
Originally Posted by chanyote66 View Post
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
Then, the prop is on backwards The prop must be configured as attached. That much variance in thrust means something is on backwards because the most variation should not exceed ~%10 max.
AJ
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Old Nov 29, 2012, 01:55 AM
Mobius Cables... I got em'
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Originally Posted by ajbaker View Post
Then, the prop is on backwards The prop must be configured as attached. That much variance in thrust means something is on backwards because the most variation should not exceed ~%10 max.
AJ
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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Old Nov 29, 2012, 07:23 AM
what goes up, must come down..
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Originally Posted by chanyote66 View Post
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...
LOL
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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Old Nov 29, 2012, 12:09 PM
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Originally Posted by AussieHoppy View Post
LOL
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
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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Old Nov 29, 2012, 12:15 PM
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Originally Posted by AussieHoppy View Post
LOL
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
I looked into that a while back. Reversing the motor in flight can be a workable way to steepen your glide path without picking up speed (the usual purpose for lowering flaps), but it can be tricky. You'd need some sort of positive control on your throttle so you'd KNOW your prop was in the reversed range. Simply knowing "it's in the bottom 1/3 of stick travel" isn't good enough. Maybe a spring with a positive stop that engages decisively, or some such (as car transmitters have), it would take some precise setting up.

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.
http://www.hobbyking.com/hobbyking/s..._Car_ESC_.html (ad mentions reverse types)
http://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:
http://www.hobbyking.com/hobbyking/s...s_Car_ESC.html
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Old Nov 29, 2012, 04:27 PM
what goes up, must come down..
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Originally Posted by Little-Acorn View Post
You'd need some sort of positive control on your throttle so you'd KNOW your prop was in the reversed range. Simply knowing "it's in the bottom 1/3 of stick travel" isn't good enough. Maybe a spring with a positive stop that engages decisively, or some such (as car transmitters have), it would take some precise setting up.
I dont know if it is possible, but i was thinking something like throttle stick range would be zero ~ full throttle, all fwd... then mix in a switch for reverse throttle, kind of like throttle cut on a gasser.
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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Old Nov 29, 2012, 04:33 PM
Mobius Cables... I got em'
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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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