Team Thrifty /Fifty Build Diary for Bitza

**PJ-27** · 5th July 2011, 16:50

How do I go about getting the FlightPower 40% discount?

I can't find the news post on the RoboChallenge website any more.

**jonny** · 5th July 2011, 17:15

heres a tip, don't buy flightpower

**PJ-27** · 5th July 2011, 17:23

I thought FlightPower were meant to be the dog's dangly bits in Li-Po?

**jonny** · 5th July 2011, 17:26

yes flighpower are good, if they arrive

**Mouldy** · 5th July 2011, 21:00

Flight power are one of the best lipo manufacturers. Best thing to do is ring them and set up an account with them. I'll pm the sponsorship information to you.

**PJ-27** · 10th July 2011, 12:14

*NOOB QUESTION ALERT!*

Got some nice drill motors for Bitza 2.0 but I think maybe I'm kidding myself that the 15a Electronize's will handle them.

Here's the spec sheet;

http://www.mabuchi-motor.co.jp/cgi-bin/ ... rs_775vcwc

We've got the 9013 but we're running at 22.2v, not 18v.

20.9a draw at maximum efficiency, the Electronize's can handle that in bursts but thought I'd offer it up to everyone else?

Could always reduce the output on the ESC.

**typhoon_driver** · 10th July 2011, 12:29

What size wheels are you running them off?

The other thing to keep in mind is that chances are the wheels will lose traction and slip before they stall so the speedo won't ever see the full stall current from the motors. The electronize should have 15amp fuses in line with them (I usually up these to 20amps) which will blow before the speedos are screwed over.

Stalling a drill motor in boner during the champs when the left thread came loose, the fuses blew saving the electronize. So do some experimentation!

The other option is to remove the relay that the controller comes with and replace it with 2 30amp automotive relays.

**Danjr1** · 10th July 2011, 14:14

im running 4 of those motors, each on a electronize 30a at 24v

worked it out at being around the 3.5hp overall

**PJ-27** · 10th July 2011, 14:26

The wheels are 170mm, but they are geared after the drill motor gear box. Don't know the size of the cogs off the top of my head.

The Electonize's have 40a burst ratings, so I'm assuming a 20a fuse will have the same sort of life time as the burst.

I think you mentioned changing the relay before. One of them is sticking so it'll be worth changing them anyway.

Do I need to change anything else on the ESC other than the relay? I'm assuming it's just a 'straight' swap.