Matilda

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21 January 2010 at 09:17 #25141
michael kemish
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@michaelkemish72883
Hi, I’m sorting out Matilda’s electrics.

I intend to run 2 motors, 2 ESC’s, 2 Battery packs.

Obviously I need to power the reciever, but that will drain one of the battey packs quicker than the other’ which will make her go round and round in circles.

At the moment, I’ve got the whole set-up running on the dining room table, measuring volts etc.

I’m using a Spectrum DX5e with mtronics ESC’s,set up so that both the motors are controlled by the LH stick. and it is possible to set them up as “tank steer”

Will I need a seperate power supply , just for the Rx?

If so, how big?

How much power does the reciever use?

Thank you

Mick
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21 January 2010 at 09:17 #5065
michael kemish
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@michaelkemish72883
RC Reciever power requirements
21 January 2010 at 14:24 #25147
Dave Milbourn
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@davemilbourn48782
Mick

A separate pack would be a good idea in this particular installation. You only need a 4-cell AA-size pack. I’d recommend having a look at the Model Power website. One of their 4.8v x 2600maH NiMH packs will be ideal. You’ll also require a switch harness to connect it to the receiver.

http://store.modelpower.co.uk/48-volt-2600mah-nimh-flat-pack-f1x4-31-p.asp

http://store.modelpower.co.uk/futaba-switch-harness-with-charging-lead-154-p.asp

John and James sell all manner of chargers and connectors; you can easily spend half an hour just browsing their website. As they say, I have no connection with Model Power – we just shout rude things at each other at the shows!

You will need to disable the BEC on BOTH of your speed controllers; there’s details of how to do this on the instructions for the Vipers or one of my pretty piccies here:

http://www.action-electronics.co.uk/pdfs/Disabling%20BEC%20ESCs.pdf

For Tank Steering you really need to fit a return spring and lever to the RH transmitter stick as well as the LH one. If you ring Horizon Hobbies then they might be able to supply you with the requisite bits – they did for me, but the guy to whom I spoke has now left.

You should then connect the ESC for the Port motor to the channel controlled by the LH up/down stick, and the starboard motor to the opposite stick channel.

Beware of the dreaded Spektrum failsafe! (you’ll find out………)

Dave M
21 January 2010 at 22:03 #25164
michael kemish
Participant
@michaelkemish72883
Thanks for the good info, Dave.

I guess it’s another trip to my local toy-shop!

Mick
22 January 2010 at 10:03 #25172
michael kemish
Participant
@michaelkemish72883
Just another quick question on the same subject.

I am intending to go the lo tec (lo cost ) way and use re-chargeable batteries to power the Rx.

I will also running the servo for the steering off the little battery pack.

OK, they only carry 1.2v (1.2 * 4 = 4.8v) and not the volts that a 5 pac or an expensive recharbable pack chcarries.

Will this be a problem

Thanks

Mick
22 January 2010 at 23:21 #25192
Dave Milbourn
Participant
@davemilbourn48782
OK, they only carry 1.2v (1.2 * 4 = 4.8v) and not the volts that a 5 pac or an expensive recharbable pack chcarries.

Will this be a problem

Not at all. In fact a 4-cell pack is standard with every RC set, and all are 4 x 1.2v nominal (but getting on for 6v when fully-charged).
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