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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › 'jerk' motor start
05-24-2007 01:56 PM  13 years ago
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skydude

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Gainesville, Florida, USA

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'jerk' motor start
Hey guys,

I put together a 450xl hde. Came with rce-bl25t and align 420L motor. esc has supposed heli mode which is described as 'soft' start. The heli jumps pretty good at startup and whips the blades out of position and then clumsily spins up until enough centrifugal (centripedal?) force pulls the blades into position.

Have tried adjusting futaba 6ex faast throttle stick position settings but does not seem to do much. The stick moves a few clicks before motor starts.

Is this jerk start normal or is there something I can do to eliminate it? Rather annoying and does not seem good on flight hardware.

Thanks

To the sky!
Watch out all you moles!!! (Vae, puto deus fio)
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05-24-2007 02:04 PM  13 years ago
Darren Lee

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Woodstock, GA

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Check your esc instructions, go thru set-up and make sure its in soft-start mode.
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05-24-2007 02:08 PM  13 years ago
S76 Mech

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Hatboro, Pa.

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Taking into consideration you "are" in soft-start mode, it sounds like your lowest throttle curve settings are a bit too high. If you aren't running a flat curve, I would set you lowest throttle curve value (the one above 0) a bit lower. For instance, if your running a 5 point curve 0, 25, 50, 75, 100, then change the 25 to say... 15. This might help, but then again there might be more to it then simply adjusting your throttle curve.Gaui Greatness X7, X5, NX4, X3
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05-24-2007 02:16 PM  13 years ago
skydude

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Gainesville, Florida, USA

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'soft' start
Yeah. I am pretty sure I set the esc to 'soft' start. It gives two beeps in the fourth mode.

Tried the number two throttle stick postion at a bunch of different places down to 10%. No change in the jump start. Just when it kicked in relative to stick position.

So it is starting to sound like this 'jump' is not normal and I should keep looking for a fix before it wears/breaks things prematurely.
Watch out all you moles!!! (Vae, puto deus fio)
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05-24-2007 02:54 PM  13 years ago
S76 Mech

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Hatboro, Pa.

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So it is starting to sound like this 'jump' is not normal and I should keep looking for a fix before it wears/breaks things prematurely.
Definately, always stop and troubleshoot a problem if you suspect something is not correct. People who try troubleshooting problems by (flying) are only asking to damage themselves, others, or there equipment. Take a step back. Think on it a while, then come back to it. That usually helps me out a bunch. Sometimes its something really simple.

Also,
Tried the number two throttle stick postion at a bunch of different places down to 10%. No change in the jump start. Just when it kicked in relative to stick position.
Does this mean that you are programming your throttle curves with stick position and (not) programmed throttle curve values ?
Gaui Greatness X7, X5, NX4, X3
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05-24-2007 04:22 PM  13 years ago
JEEPWORLD2002

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BLUEBELL PA USA

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what esc are u using ?
i prefer castle creations myself, tons of programable features too.
Trex600n Trex500 Mikado LoGo5003d// Hacker, CastleCreations,Ys 50, JR 7703d/8900, Radix
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05-24-2007 04:48 PM  13 years ago
S76 Mech

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Hatboro, Pa.

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rce-bl25t
Top of the post.
Gaui Greatness X7, X5, NX4, X3
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05-24-2007 11:42 PM  13 years ago
HHawk

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Gardnerville Nv.

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My 600 was jumpy at first, but after about 6 flights it mellowed out majorly! I changed nothing, just flew it. Mine was so jumpy at first, I had to manually spin the blades to avoid jerking the blades crooked.
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05-25-2007 12:29 AM  13 years ago
skydude

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Gainesville, Florida, USA

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'jump' start
Hey, thanks for all the thoughts. I am so close to having this all together - I hope.

Have over an hour on it so it does not look like it is going to smooth out any time soon. I know things like that do happen.

I am programming in the Tx - Futaba 6 faast. tell it a % for the 1 thru 5 positions. No stick handling.

Gotta love the electric. I could have never learned how to fly so quickly without being able to just pull it out whenever I had a few minutes to work out the last thing I was blowing.

SO quiet. Love hearing the blades buzz as it goes by. I think it is supposed to sound like that. It sure sounds cool. In spite of the energy loss associated with sound production.

To the Sky.
Watch out all you moles!!! (Vae, puto deus fio)
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