specgts

Hi,

I'm still pretty new to electrics I have the following set up wondering what is wrong with it.

Hacker B20 12L
Jeti Advanced 30 with lipo support
2000mA 3S2P pack
GWS 11x4.7

I'm wondering why it is drawing so much current that I only get 5 mins out on the lipo pack.

Any advises?

jonnyjetprop

My Feedback: (3)

Are you running a gearbox or direct drive. What is your current draw?

John

pikebishop

you need a gearbox to run the larger prop

specgts

Yup there is a 4-1 Maxon gearbox on it.

But somehow it always draws too much current from the battery packs.

I might invest in a Watt meter. Any other way to measure current draw? from a multimeter?

Dylwad

My Feedback: (11)

the 12L motor is wayy too hot for 3S lipo and an 11 inch prop. Invest in a whattmeter, and ill bet you find out that a 9x6 prop is probably the largest you want to run to stay under 20 amps. The 18L would have been the better choice to run an 11 inch prop on 3S lipoly, and thats even pushing the amp limit on these motors given they are all running with the 4:1 maxon gearbox.

5 minutes out of a 2000 MAh lipo pack is going to kill the pack in short order, too many amps.
an 11x4.7 prop with your current setup is going to heat your motor up, and demagnetize it.

Dont use GWS props on brushless motors this powerful, they have very poor performance at higher RPM's and there is a possibility of it throwing a blade in flight~which could be dangerous.

$60 for a whattmeter is worth it, considering you have 300+ in equipment your trying to kill.
Also check out motocalc
Dylan

Dylwad

My Feedback: (11)

Okay, i just ran your setup through motocalc, its predicting 30 amps. i would try an apc 9x5 thin electric prop, which should bring the amps down around 20.

Also are your lipos 10C capable?

Dylan