RC Tank Warfare community hobby forum

I'd admit that if you have two motors in a tank it might need trimming to run straight, but I'm sure I have given a few people an idea of whats possible.

I thought that I had posted this ages ago.....but I obviously didn't ......The Magnets will NOT work on the Heng Long Drive motors,when they are run directly from the RX-18 receiver board .....the board must have a limiter on it , which I suppose is a good idea, to protect itself from excessive current damage.So the Magnets have no effect at all

My only thought to get around the RX-18 receiver board' limiter' would be to use a relay. Connect the power IN of the relay directly to the 7.2 Volt battery and the power OUT to the motor terminal . The relay would have to be a DOUBLE POLE SINGLE THROW Relay controlled by a variable resistor, and connected to ONE of the motor power out wires so that when the RX-18 board is producing its FULL power it will provide sufficient power to activate the relay and cause it to close and supply FULL power, to both the motors
This would then allow extra power to be drawn by the motors DIRECTLY from the battery and so 'Get Around' the circuit board limiter. It would produce an effect of a sudden very large increase in power to the motors ...SO..it will probably look a bit like nitrous oxide injected into an internal combustion engine !! I think that it would be better just to have it on Forward alone and NOT in reverse but it could be done by using another DOUBLE POLE SINGLE THROW relay connected to one of the reverse circuit of the board.
I have not tested this yet.....but it should work as I tested a Heng Long motor connected directly to the 7.2 Volt battery and ran it, then when I added the magnets....it just 'Took Off' and REALLY speeded up......so in theory it will work with the relays.....the hardest bit would be trimming the variable resistor to get it just right so that they kick in at full power.
Obviously any difference in power or friction between the motors and gearboxes on each side would cause the tank to steer slightly off-course and so it will almost certainly drive in a slight curve......but how often would you want to use the 'Nitrous Boost' and it certainly would NOT be in a confined space so the lack of precise steering whilst 'Boosted' would not really matter.
When I get the chance I will try this out and see what happens.....the hardest job will be getting the relay that can handle the current draw at the BOOSTED FULL POWER... LOL ............ I might have to try 2 x car 12 Volt , 30 Amp relays connected in series, I know that these CAN be operated by 7.2 volts....as a cheaper alternative to a Double pole relay ....AND... I have 2 just lying around, just waiting to be used.... It would enable tanks with the 3-1 reduction gearboxes to cover 'open ground' very quickly instead of at the normal strong, but slow speed !
Alb.

OOPS.... ...Just having read what I just posted......... the negative terminal of the motor would ALSO need to be connected to the battery directly ...OR...the extra power would either still be limited by the RX-18 Circuit Board...or it would 'Fry It' ,neither of which is good !! LOL
So you would need 2 x DOUBLE POLE SINGLE THROW relays or 4 CAR 30 Amp kind and this will occupy quite a lot of hull space.......SO.....is it a good idea or not
Alb.
( I will still give it a try one day just to see what happens )

I have read many posts regarding the motors and gearing in our tanks is to high, and they need to slow down to achieve scale speed, I would not want to risk burning something out to get the tank to go faster.

I just dropped in two Permax 400 size brushed motors I had already and the speed difference is considerable. I also noticed that the gear mesh sounds much louder as well. I was fine with the more scale speed of the Mato motors but when my DBCRC2 power reduced to 25% my Tiger wouldn't move at all unless it was downhill. I thought the noise of the gear mesh is not good. I still haven't tried using the valve grinding compound to clean them up. Thats next on the list and I hope that will quiet them down.

Hi,
My idea is to boost the speed of the tanks running the 3-1 reduction gearboxes which are rather too slow in my opinion and are well under the actual scale speed. I use 2 types of 3-1 boxes and when you have a large flat area to drive through it seems to take ages,to travel over.
So this seemed an ideal way to have the low down torque and power of the 3-1 reduction for hill climbing and rough terrain but then a higher top speed that is more to scale for the wide open spaces. So if the idea works then you can have the 'Best of both worlds' with High Torque ..AND..a scale top speed.
Alb.

Sounds like a good idea Go for it