Witch engines ?

[MiPi]

Witch engines do I have to use on a (approximately) 1/10 scale ?
How to calculate the driving speed ?
Witch engines are best spur or planetary gear ?

12VDC, 294rpm Planetary Gear Motor PGHM
• 12VDC 253RPM 138.9oz-in Spur Gear Head Motor
• Voltage: 12vdc
• RPM: 300
• Reduction: 20:1
• Stall Torque: 111.099 oz-in (8.00 kg-cm)
• Nominal Torque: 15.55oz-in (1.12Kg-cm)

Or

Pololu 12VDC, 350rpm 29:1 Metal Gearmotor
• 350 rpm 29:1 Metal Gear motor
• Free-run speed @ 6V:175 rpm
• Stall torque @ 6V:55 oz·in
• Intended for operation at 12V

Or

12VDC 253RPM 14oz-in GHM-12 Spur Gear Head Motor
• Voltage: 12vdc
• RPM: 253
• Nominal Torque: 14.44oz-in (1.04Kg-cm)
• Stall Torque: 138.9oz.in (10 Kg-cm)
• Specially designed to operate at low speed
• Shaft Diameter: 6mm

[pistenjäger]

If you read the calculations in the file below, you have a easy selction.

magic_viewtopic.php?f=11&t=1268

Regards Michi

PS: The attached pic shows a drive for 1:12 with nominal 4 Nm and a end speed on the drive/cains max. 180 rpm.