14.4?

[mook]

I was wondering if i could make a Y lead and use two 7.2 batts to create 14.4v?

If possible then I guess I would need an esc capable of handling 14.4v. I would, if possible use the 14.4v to power a brushed motor.

Does that sound feasible?

is there any thing else to think about?

If possible what kind of esc would i require? I would be looking for a low turn esc good for 14.4v

Edit: Would an old 'solid state' tamiya Mechanical Speed controller work?

thanks

[guver]

An evx traxxas esc will do it and hooks the batts in series for you.

[ElectricThunder]

I've used a duratrax streak before (even though it's rated for 10 cells, it handled 12 fine, 12 turn motor limit as well, although I'd stick to running mild mods and stock motors on 14.4 volts because of amp draw). I had to disable the BEC though (took the red wire outta the radio plug, or was it the black one...). Then.... I ran 14.4 volts on a 17 turn Orion Havok motor (POS). Eventually the motor just gave up.

The traxxas MSCs would probably not be a good choice for 14.4 volts. I think I blew one of 'em up or made it catch fire or something. The resistor (big white thingy) is bound to get pretty hot at least, which makes it pretty dangerous.

[guver]

Yes, that's about max for the streak, I had run one a long time ago on 12 cells, but the bec went messy. I now use one with 4S lipo and works great.

[mook]

thanks for the help folks

what would happen if i ran 14.4v through a tamiya teu 101 esc? I take it it would fry it?

what would happen to the reciever and servos?

[ElectricThunder]

thanks for the help folks

what would happen if i ran 14.4v through a tamiya teu 101 esc? I take it it would fry it?

what would happen to the reciever and servos?
It would go POOF. The receiver and servos should be fine, unless you use the BEC in the ESC, although I'm pretty sure the BEC would fry before any damage was done to the Rx or servo. Still....don't try it..;).

[mook]

thanks electric thunder, i know naught about electrics.

Im still keen on building a 14.4v lunchbox with a brushed motor.

I am a bit confused as to which parts to use though.

I thought using the old tamiya msc would be cheap way to run 14.4v. Seemingly the resistor would go boom.

So, it seems, i need an esc

So what esc can I use that will not go poof and i can use on a brushed motor?

The battle plan is to make a Y lead, get a sorted esc and use the power to run a 19t motor. I need an esc that will not fry the servo and reciever as well

thanks

[guver]

HV maxx novak
EVX traxxas
KA-6 Perfex

and some mtronics I don't use them

The cheapest way is to use a duratrax streak, it might just barely handle the voltage, but a 14 turn motor (540 size) will overspeed.

[mook]

thanks guver

silly question

But would a 14.4v vehicle be twice as fast as a 7.2v ride?

Also, which esc would you choose, if you wanted a cost effective yet reliable esc for a brushed motor?

HV maxx novak
EVX traxxas
KA-6 Perfex

thanks

[guver]

Hmm, with all else being equal double voltage would almost be double speed theoretically, but realistacally it might be about 50 % faster. Out of those 3 I think the evx is the best deal. It really depends on what you can get away with. My lightweight TD uses a streak with twin motors and 16 volts.

[Chris LaPanse]

With all else ideal, doubling the voltage would quadruple your power and cut your runtime in half. In reality, it wouldn't be like this, it would give you perhaps twice the power (note: does not = twice the speed), and a little less runtime (not much though). Definitely a HUGE improvement ofer 7.2v though.

[SandManRacing]

I achieved 49MPH with 12v on a RC10T3. So 14.4v would be really fast.

www.lemordudurc.com for a video

Forget the mechanical speed control it would fry. Use a really good ESC.

[SandManRacing]

BTW, runtime decrease a lot. Do the maths...

Lets say a pack of 3000mAh last 10 min on 7.2v... so the current is 18Amp.
(3Ax60min = ?x10min -> ? = 18A)

At 14.4v the current would be twice (theorical), so 36Amps
(V=RI) Voltage double, Resistor is constant (motor winding), so I (current) doubles.
With a 3000mAh it would last 5 min...
(3Ax60min = 36x?min -> ? = 5min)

Think about it.

[SandManRacing]

Sometime I use 8.4v instead of 7.2v and I can notice the shorter runtime. But a little more power :)