Speed 900s

[Bodge Job]

Are these the proper speed 900s? Or the replicas? Because they look real, but I thought the proper ones were £60 not £40. Thanks

[PJ-27]

Re: Speed 900s

I think you've missed the link out.

[Danjr1]

Re: Speed 900s

If its the ones on eBay, then I'm sure they are replicas of some sort. I'm thinking of running two of them on 30a electronizes but I'm not sure whether it's worth the investment seing as I'm running four 18v drill motors at 24v at the moment

[mattsdragons]

Re: Speed 900s

i have considered these yet ive found running 12v drills on 18v gives me a bot that's plenty quick enough

[Ellis]

Re: Speed 900s

i have considered these yet ive found running 12v drills on 18v gives me a bot that's plenty quick enough

I have that setup, and I agree, any faster and it would start getting really hard to control.

[Anttazz]

Re: Speed 900s

Proper ones are £40. Got mine a few weeks ago from Cornwall models

[Bodge Job]

Re: Speed 900s

Woops!!!! Its: http://www.sussex-model-centre.co.uk/sh ... sp?id=5438 and i used drills before, but they don't have the strength/speed/ shape/reliability I require, bruiser used drill motors, and it was ok, but nothing better, I wont to build a faster more competitive robot, which can be fast, so it can easly get round the RL/RR arenas, with out boreing the audience...

[Eventorizon]

Re: Speed 900s

On the real Speed 900 what is the schematic for the attachment hole positions? Also in the pictures it looks like thee is a small bit that sticks out the front of the the mouuting frame with the shaft. What is the diameter of that and how far does it stick out from the mounting frame?

Or does anyone have a good CAD model of it, preferably solidworks... (Yeah long shot I know)

[maddox10]

Re: Speed 900s

A speed 900 has a nose of 22mm, 6 long.

[Bodge Job]

Re: Speed 900s

Ok, and does anyone know it's touque? Just so I can see if the gear reduction I plan to do is ok

[maddox10]

Re: Speed 900s

A real Speed 900 does 1.1 Nm@12V in stall

[Bodge Job]

Re: Speed 900s

Ok, and how much force would it take to drive a robot? Would 2.5 kg of force per wheel be anough?

[maddox10]

Re: Speed 900s

Depends on other factors too.

biggerwheels have less roll-resistance, to give one of the variables.

[Bodge Job]

Re: Speed 900s

Roll resistance? What is that? And btw, it's 4 wheel drive

[maddox10]

Re: Speed 900s

Roll Resistance. (Google it please)
The reason why cars are getting bigger wheels over time.

See the difference between an original mini cooper and the new one. And no, it's not a marketting ploy, but a way to get a little better fuel efficiency without investing big loads of money into more efficient engines.