New FW- doorstop

**plargen** · 26th October 2012, 13:20

i used this website to calculate the weight of the the Armour for my 4wd that got 8mm steel round the sides but i had to use 3mm on the base and aluminium for the top plate to keep it in weight, and i just weighed the wheels motors etc and its about 12kg without the wepons

http://www.matweb.com/tools/weightcalculator.aspx

it was drill powered not speed 900

**maddox10** · 26th October 2012, 13:22

Size of wheels? 100mm?

**Danjr1** · 26th October 2012, 13:39

120mm diameter with bicycle tread

**Ellis** · 26th October 2012, 13:48

I'd be amazed if normal drills would handle that. Ours destroy themselves with smaller wheels and lower voltage...

**maddox10** · 26th October 2012, 14:00

Very fast machine then.

Unless you got a strange set Speed 900 replica's. What size of axle did they have?

**Danjr1** · 26th October 2012, 14:10

Sorry, my fault! The replica speed 900 bot runs 120mm wheels on a 12mm axle. The drill bot would use 75mm robo challenge wheels

**maddox10** · 26th October 2012, 17:19

I ment, what axle does the replica 900 have. There are 3 major types.

5mm, fast runners, ment for applications as battery-leafblowers and such.

6mm, speed 900 size.

6.35 - 1/4 Ment for car applications.

**Danjr1** · 26th October 2012, 17:38

5mm output shaft. These are the replicas from ebay

**maddox10** · 27th October 2012, 00:32

Fast runners then. 12K rpm @12V

@22.2V those want to run 22.2K rpm. With a gearratio of 7.5-1 the theoretical topspeed should be 71km/h, given time.

Unfortunatly, it will be something about 35 km/u, and the motors will run half speed, drawing more amps. Don't close of the vent holes, and maybe adding a small fan to keep the air flowing trough the motors at all times.