My rotors not rotating

[sooren]

I have a 450 SE with helicommand. Just went outside for a couple of packs, switched the DX7 on and checked al the controls were working ok but when I moved the throttle the rotors did not turn - the DX7 showing 10.4 so that should rule that out however I have put it on charge.
I know its Sunday but am I missing anything obvious?
Regards
Paul

[Tim Procter]

I have a 450 SE with helicommand. Just went outside for a couple of packs, switched the DX7 on and checked al the controls were working ok but when I moved the throttle the rotors did not turn - the DX7 showing 10.4 so that should rule that out however I have put it on charge.
I know its Sunday but am I missing anything obvious?
Regards
Paul

You sure you havent clicked the "hold" switch by mistake.

[sooren]

Hi Busterboy,
i have just tried that on the DX7 and it makes no difference - all the servos are working but nothing happens when I give it throttle.

[Tim Procter]

You checked your three wires are connected firmly from the esc to the motor.

Also don't know whether you have in idle up setup on your heli but check that switch hasnt been engaged into idle up too.

After that try re-programming your esc again.

[Smoothound]

If you are getting motor noise but no spool up then try swapping 2 of the motor wire connections over between ESC and motor. The motor could be running in the wrong direction. Ignore the wire colours it is not important

[sooren]

Phil
The heli is only a week or so old and has been working fine so I feel sure the wiring side is ok.

[jamiem]

does the motor do anything? do you get the start up beeps?

[sooren]

Yes. Every starts as normal and all the elevator controls work fine. I then give it some throttle and nothing bar a 1/4 turn or so of the blades. The head spins nice and free.
Its weird - I flew it last night with no problems.

[jamiem]

in which case its cutting out beacuase there is too much resistance. check you tail belt is still ok, it may have twisted at the back or jumped off the pulley, id put money on it

[sooren]

Hi Jamien
When I spin the rotor by hand it goes around about 6/7 times - it is nice and free with nothing catching. The tail belt and drive are all fine.
I am wondering if it could be the Transmiter - DX7 - the trouble is being new to the hobby and the Dx7 find it all a bit confusing - I have not been into the settings and the whole kit was purchased all programmed and ready to fly.

[Made2Fade]

Try reprogramming the ESC... it might have lost its settings somehow. Or at least see if you can get into the programming menu. Could be you need to calibrate the throttle also. Check nothings catching on the outside of teh motor if its an outrunner. I had a servo wire come loose and trail along the outside of my motor on my Mini T. It caused the motor to not work as i think they cut off with resistance.
Lee

[jamiem]

if you are certain, then undo the motor, release it from the mesh with the main gear, then try again. if the motor spins ok, then its definatley that there is some resistance somewhere, if not it may be a faulty motor or esc. the dx7 is sending the right signals, but something is a miss on the heli.

[sooren]

Well I have droped the motor down and connected the battery - and it works - tried to stop the motor turning by pinching the pinion - it is possible but not easy - then you just close the throttle to reset it. I have double checked that the rotors move freely and that there is no bining anywhere and all is ok. I will put it back together and try again. Frustrating hobby!

[gazza]

I agree. First things first with problems like this get the motor loosened off, moved away from the main gear then tightened back up for safety's sake. You can fiddle around to your hearts content then without any nasty surprises mate

[DemonJim]

Could it be a jammed motor? I had a small outrunner once (on a Twister 3D) and it was jamming for no apparent reason and drove me mad until I looked closely inside - a staple had got pulled in due to the magnets and caused it to jam up (not much space between the rotor and magnets).

Sooren you say you connected the battery directly to the motor to check it works? Not a good idea! It's brushless and requires carefully sync'd alternating current into the three wires to work (ie you must use the ESC) - all connecting a battery directly will do is probably make it jolt and burn out one of the coils (and break it - perhaps that's what's happened?). You say it now turns 1/4 turn so it does sound like maybe you've burned out a coil as the ESC can't fire a pulse into one of the coils to keep it running. Maybe

Ideally try connecting a different motor (no need to mount it of course) to see if the ESC can spin that one up.