Troubleshooting: Cannot Control Plane - RC Groups
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Jan 09, 2013, 12:19 PM
Registered User

Troubleshooting: Cannot Control Plane

I am flying an FMS Skyraider - 800MM I think - brand new. Build was good and all controls tested good. I am a good micro park flyer pilot and this is my first step up to a slightly larger plane.

Initial flights were bad (pilot error and didn't check CG or secure battery inside plane) and I took a hard landing and lost a prop - went home and had to re-glue the motor mount and try again.

OK - I finally got it off the ground (weather has been horrible here for park flying)... now I need some advice. I flew my other planes to prove that I AM capable of flying... but flying this plane is still like putting socks on a rooster.

Please let me know what to try next.

OK - here is what happens...

Takeoff roll was short and sweet and up it went - I was happy for about 5 seconds. It then started to pitch up then stall out once i hit full throttle at about 15 feet. I couldn't get it to trim fast enough to feel comfortable so I brought it down and landed it.

I then trimmed it a bit on the ground in anticipation - took off again and still at 3/4 throttle it wanted to go nose high - I let it get more altitude and tried to go straight out. I made a slight left bank and it wanted to snap-roll and spiral - so I eased up on the controls. The remainder of the flight was like a rodeo bull ride. Battling between the planes desire to porpoise and spiral down.

There was no gentle bank - there was no straight and level. Finally made a death roll and nose dive into the dirt. Lost another prop and the motor mount seems loose.

What I know -- the control surfaces are in the middle hole and the TX is set up right. I THINK the CG is correct based on what I found online (fingers at the fattest part of the wing - about an inch back from the leading edge, plane upside down balancing) - does it need more nose weight? What else could make it so un-responsive to correction and hard to fly?

I flew my micro park flyer for another 20 minutes, that made it all better. I really want to get this bird flying!!!!! What am I doing wrong??????
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Jan 09, 2013, 12:50 PM
Registered User
Jim Buzzeo's Avatar
it sounds like it's tail heavy... and you allowed it to stall or tried to take off at very near stall speed.
but I also must point out:
"I flew my other planes to prove that I AM capable of flying."

all airplanes do not fly the same.
you're going from a very simple easy to fly trainer (which you've only just learned to fly)
to a full blown, 4 channel (maybe 5 or 6 channel) high powered, high wing loaded warbird
(that hasn't been trimmed) in one fell swoop.

FIRST, adjust the CG so the airplane is SLIGHTLY nose heavy.
(that is, AFTER you've discovered exactly where the CG is supposed to be... )

Second: secure everything inside the airplane. (give the airplane a good SHAKE... that's what's going to happen to it once airborne .. fix /secure anything that moves)
Third: let an EXPERIENCED Pilot (one who has been flying for 4-40 years) fly and trim it for you.

keep flying the trainer airplanes to gain experience

3 months from now AFTER you've gotten more experience give the Skyraider another try.

think about it: you've barely taken the training wheels off your first two wheeler and you're surprised that you're having trouble riding your new 500 horsepower monster.

NO OFFENSE!! :^) we ALL had to learn.
Jan 09, 2013, 12:53 PM
cmdl's Avatar
sounds like a cg issue still. also, move the clevis to the outermost hole on control horn and try - may help.
Jan 09, 2013, 02:30 PM
Drone offender FA377YHFNC
Originally Posted by cmdl
sounds like a cg issue still. also, move the clevis to the outermost hole on control horn and try - may help.
Agree with Jim's advice and yours, with special attention to getting that CG reasonable. Welcome to maiden flight gotchas! Don't panic.
Jan 09, 2013, 02:32 PM
Grumpy old git.. Who me?
JetPlaneFlyer's Avatar
I'm assuming you have checked the manual and balanced it as per the recommendation? If so then it sounds like a combination of inexperience with this type of model, and maybe too much throw on the control surfaces and/or not enough exponential.

I've no experience of this particular model but in general these small scale warbirds can often be quite tricky to fly. Depending on what you have flown before you might be biting off more than you can chew.
Jan 09, 2013, 03:56 PM
Registered User
You might also want to consider a bit less throttle and a longer take off run . When you add throttle it's going to make the nose go up if you have to much throttle, then you put in some ( To much ) elevator and you are now in trouble ( a stall ) . ENJOY !!! RED
Jan 09, 2013, 04:11 PM
Registered User
And yet another of the notorious 800mm FMS warbirds "can't get it in the air" stories. At my field, there are 4 of these that have had issues like the ones you describe.
Jan 09, 2013, 07:19 PM
You can't take the sky from me
cfircav8r's Avatar
You also had to repair the motor mount right off the bat. You may have added up thrust during the repair, this can give an excessive pitch up response to throttle.

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