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› Watts per Kilo - scale flying
09-06-2011 11:57 PM  6 years agoPost 1
liljalepeno

rrNovice

Dublin, Ireland

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Hi folks, is there a standard or accepted minimum watts per kilo ratio for e-conversions when scale flying?
I have heard many varying figures from 100w/kilo to 290w/kilo so am a bit confused as to what to aim for.
My current set up on a converted shuttle on 6s was pulling 62amps peak when I checked last which is a scary number and converts to something like 1100 watts and 300w/kilo.
This can't be normal......................is it?

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09-08-2011 07:06 AM  6 years agoPost 2
heli_headcase

rrKey Veteran

Hovering around Atlanta

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Your 100W/kg is a good estimate. I use the figure of 50W/lb as I don't use metric units every day and that equates to 110.5W/kg.

This is the power needed to hover using a typical 2-blade main rotor. My heli's have been in the range of 95W/kg (ultra low-speed rotor system) to 165W/kg using a somewhat low efficiency motor and a 4-blade rotor.

The peak amps reading on the Shuttle is within reason if you're going for a fast collective climb and 3D (1350W) and my electric convert Concept 30 draws about the same. If I crank the pitch up a little more 1500W is very possible.

I think you're OK. Just keep an eye on the motor temperature if you think something isn't right.


HHC

So many heli's - too little time...

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10-27-2011 08:34 PM  5 years agoPost 3
munkey nuts

rrApprentice

wales uk

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where does it say how many watts per kilogram? ive looked at specifications and it doesnt seem to say.

thanks

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12-04-2011 07:40 PM  5 years agoPost 4
liljalepeno

rrNovice

Dublin, Ireland

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Sorry for the delay, have been away working for a bit and had limited access to the web. Thanks for the advice, 100w/kg was my aim based on reading other conversion threads. I could never realy nail the figure down, guess it depends on so many factors. Anyway I knew the heli was drawing too many amps based on the math I had done. I eventualy went over the heli in detail and found a problem with the belt. It had a few misformed teeth which caused the belt to tighted up every other rotation resulting in massive amp draw. Belt replaced and tail drive is silky smooth. Heli retestedand it now draws 32amps. Big improvement and almost 4 mins more flight!

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