Spike evolution (featherweight)

[Danjr1]

Currently running 4 Argos motors on 12v nimh, via blue marine escs. Thinking of going to 4 24v drill motors at 30v via a sabretooth 50hv. What do people think?!

[mattsdragons]

why not just overvolt your argos ones to 18v, that will give you some great speed on the right wheels for less cash

[Danjr1]

30 is better than 18

[gizz]

The higher voltage you're using also affects the total weight as you have to have more cells = more weight on the batteries alone which in turn
gives you less to play with for armor / active weapon etc, also a bigger speedo weighs more. Not by much bit it still counts.
12v drills on 18v has been used succesfully and could be a good start, wont have to buy more drills or a larger ESC

[psychostorm]

Currently running 4 Argos motors on 12v nimh, via blue marine escs. Thinking of going to 4 24v drill motors at 30v via a sabretooth 50hv. What do people think?!

I think you're mad.
24v hammer drill motors will be fragile & force the width out to 30cm minimum. The speed in any case could be well beyond controllable.

[typhoon_driver]

30 is better than 18

Not necessarily. Overvolting a 12v motor to 18v is a 50% increase, overvolting a 24v motor to 30v is only a 25% increase. When you double the voltage on a motor you get 4 times the power out of it. So it's a % increase that you're after. This is why motors burn out, they produce more power than they can handle, draw too much current, overheat and burn out.

This makes the assumption that the two motors are of the same power output to start with.

[Danjr1]

Currently running 4 Argos motors on 12v nimh, via blue marine escs. Thinking of going to 4 24v drill motors at 30v via a sabretooth 50hv. What do people think?!

I think you're mad.
24v hammer drill motors will be fragile & force the width out to 30cm minimum. The speed in any case could be well beyond controllable.

The 'bot is 50cm wide already! Why would they be fragile?

[psychostorm]

Bowing forces due to the length of the overall mechanism make it snap at the plastic gearbox tabs.

Or at least that's what happened when I tried

[ewan]

Much easier to mount smaller drills too

[Danjr1]

Got a 24v drill today! A lovely looking motor and gearbox (looks like it's the next grade up from the Argos motors) but doesn't look like it's going to work sadly.

Soooooooooo..........

How much does it generally cost to make a drum/spinner? The actual spinner part? And what ratio do people run?