Head shake in auto situation

[Crumpet]

I have my new 700e pro dfc hv, and 5th flight in once I've landed I hit throttle hold and just to see how well it floats I added a TINY amount of pitch, I would guess around 3degrees, not enough to take off with the power on. The heli vibrates fairly violently as if it had gone out of balance / the blades had swung.

I have my blades properly tight and always make sure they are straight before takeoff as it does take a fair bit of revs before they straighten out so I was surprised it behaved like this with such little pitch.

I haven't auto'd it yet and now I'd be nervous trying!

Any ideas?

Thanks!!

[Guest]

Are your blades too tight? They should just about fall under there own weight. Too tight won't allow them to lead and lag as they should and put the Heli out of balance.

MJ

[tomatwalden]

I think that the situation you describe (heli landed, throttle hold, tiny amount of positive pitch) would cause any (flybarless) heli to shake! You're sort of flying it, sort of not flying it. I think the whole scenario is basically false and FBL units aren't designed for that scenario.

I would try doing a throttle hold landing - hover less than a metre above the ground, hit TH and let it float to the ground.

[myxiplx]

I think that the situation you describe (heli landed, throttle hold, tiny amount of positive pitch) would cause any (flybarless) heli to shake! You're sort of flying it, sort of not flying it. I think the whole scenario is basically false and FBL units aren't designed for that scenario.

I would try doing a throttle hold landing - hover less than a metre above the ground, hit TH and let it float to the ground.

+1 Adding positive pitch on the ground while it's spooling down is pretty much uncharted territory.

I'd also suggest a baby auto, they're recommended as the way to start learning autos and if it spools up and down normally otherwise you should be fine. Just ensure that you're not going to get any sudden pitch changes as you hit throttle hold and give it a go. I started about a foot off the ground, and just slowly added a little height as I got more comfortable.

[myxiplx]

PS. Have a read of this:
How to teach yourself to auto in 5 lessons - HeliFreak

[Crumpet]

Thanks guys,

I can auto, I do it with my 450... I was just playing with the 700 and after that I wondered if it was a good idea lol.

I'll have a play at a metre and hopefully it'll behave

[muscleflex]

video would be useful next time