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Gunnergolly

Kontronik KBM 42-30 3.7:1 Motor/Gearbox

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Gunnergolly

Hello 

I have a Kontronik KBM 42-30 3.7:1 Motor/Gearbox combo which i intend to fit in a 3.6 meter Stork 4 that will hopefully weigh around 2.1kg when completed. 

Just needing some ball park advice on what size prop to use and expected current draw for a 3S setup on the above motor so that i can order the ESC ?..

I have searched but struggling to find spec's for this motor, so not sure what it's current rated for.

Thanks

Chris. 

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PeteMitchell

It looks like it is quite an old motor, which explains why there is no data anywhere.

Motorcalc has it in their database so this may help. 

 

 

2017-09-17 22_49_09-In-flight Analysis - Maxa4e.png

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Gunnergolly

Thanks Pete

I came across this post on the German forums :-

http://www.rc-network.de/forum/showthread.php/197721-Welche-Latte-für-Kontronik-KBM-42-30-3-7-1

Its basically saying to use either a 13x7", 12x7", 12x8" prop on a 3S setup.

I read somewhere else that the above motor is good for 40A continuous, so i'll use a 12x8" as a starting point and hopefully achieve around 450 - 500W ?.

My other Kontronik motor (FUN 500 -27 with a 4.18 box) achieves 482W @ 43A, so the 40A continuous current rating for the KBM 42-30 sounds plausable. 

I will also buy a licence for the MotoCalc program and play around with a few combinations myself. 

Thanks

Chris. 

 

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Gunnergolly

I did a power check last week using a 3S 3000mAh 30-40C battery with a 12x8" prop and it came out at 540W whilst drawing 49A.

I have reduced the thottle end point down to 85% and i'm now getting 500W at 45A.  

My Stork IV weighs in at 2.25kg and It climbs well with 500W, however i think it seems to climb better with a bit of reflex across the whole wing.... I will need to experiment with that in the future.

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