Overlander Thumper 4240

[Allan Bowker]

I have this motor spare, can anyone tell me its 2 stroke IC equivalent size?

 

(i.e .20  / .30  / .40 / etc)

 

I have my eye on this plane and wondered if it would be enough?

Fast Forward ARTF

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C4240/10 KV890
Purple cased outrunner

Turnigy / Tornado / Overlander
Thumper 4240 Brushless motor.
540 watt motor
900 kv
suitable for 9 - 21 Nimh cells or 3 - 7 Lipoly
Prop size from 11 x 5

Motor Weight: 140g

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[ken anderson.]

hello allan-i would have thought the weight of the motor and battery would be a bit of a penalty in your model racer-if you want to keep the same spec performance-timbo will be the one to run his eye over the eletric's and let you know for sure...............

 

         ken anderson.............

[Tim Mackey]

1) Very tricky trying to make IC / electric comparisons...but as a rough guide.. a 500 watt motor could be compared to a .25 IC engine.

2)  That motor is not ideally suited for the model linked. Its a racer, and needs a higher revving motor - 900 Kv is a tad low for this type of model, and besides, at an all up weight of circa 4lbs+ you would need at least 500 Watts for decent racer like performance.

 

You could try the motor on high cell count maybe 4 or 5s, and prop down a bit to keep the current in check...but at 540 watt maximum rating, its a bit close for comfort IMO.

[Allan Bowker]

Thanks guys, I thought it wouldn't be enough.

At least it was worth checking with you first.

 

 

 

I will have to find another model to put this spare motor in.