Throttle/Pitch curve on electric heli

[Marbaise Philippe]

Hello everybody,

I would like to have your suggestions about how to set the throttle/pitch curve for an electric heli.

I've already heard all possibilities till now. But what's best.

Some says: let the throttle and pitch way identical (linear: 25%-25%, 50%-50%, 75%-75%)

Other says: let throttle go from 0 to 100% on the first 25% of pitch curve and put it at 100% the rest of time. (full speed at any time except start and stop of engine) This to avoid overheating of controller.

Other guys says: set your curve so that your rotor stay at same speed whatever stick position is. (Means, fine adjustments of throttle versus pitch).

I currently have an Eco8 using standard motor with an Ikarus Heli 4000 controller on 8 cells 2400 sanyo giving me 10 min hover.

What are your advises on this topic...
I would be glad to have some help.

Philippe


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philippe.marbaise@belgacom.be

[Richard Fry]

Philippe,

I have a throttle curve set so that by the time the heli is lifting (mid stick), the throttle is at 100% on normal, and 100% all the time on idle up 1 and idle up 2.

I'm running the Kyosho MMR on 10x3000 cells and have tried to set so that the motor is running the blades at the same rpm right through the pitch range, but have found this practically impossible when taking into account the 'flattening' of the power through the flight.

I know the perfect setting is to have the blades running the same rpm throughout the pitch, but with a small heli and a brush motor I don't think it's possible.
Given a brushless setup with reliable ESC and possibly greater number of cells then you could get somewhere close I suppose.

I have an EP with the same sort of setup - the best thing about running the blades at full power is that the ESC isn't wasting energy dissipating the heat of partial throttle settings, and you always know you have all you can get out of the motor and can adjust the flight accordingly.

This is just my thoughts, you should get differing views from others - just try them out and stick with the best option that suits your style.

Richard.

[Marbaise Philippe]

Richard,

I think I will follow your advise
and try a setting at 100% at hover point.

That's damn true that the battery flattening is "sensible" while hovering.

Your stick hover position goes higher and higher till the end.µ

Thanks!

(If other pilots have opinion on that subject, i'm still open to read from them)

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philippe.marbaise@belgacom.be

[Robert]

I have messed with so many different throttle curves it's not funny. Found a linear curve(?) to be the best, to my surprise, for a 10 cell 2000mah pack and Kyosho MMR. I'm running carbon symetrical blades instead of the stock wood semi-symetrical. 0%, 25%, 50%, 75%, 100% are my 5 points. My pitch range is currently -3.5 to +9.5 (90 deg 3 servo CCPM). I,m working up to loops and rolls now that the 10 cells have the head speed up sufficiently- wow it really performs now!