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MetalMan · 08.26.2009, 03:26 PM

There is a calculator:
http://scriptasylum.com/rc_speed/_solver.html

Ian is right, it will spin too fast. For a typical crawler anything more than about 5mph is useless IMO (your top speed would be about 10mph). And with the 4130 on that low of voltage I think you will have issues with cogging, which is the nemesis of a crawler. Here's the best I have come up with for a crawler:
http://smg.photobucket.com/albums/v1...de/King%204x4/
You can see the evolution of my crawler, but unfortunately I don't have more recent pics up.
Basically, it's got a kv of about 750, on 3s Lipo. Overall gear reduction including diffs is 16.9:1. Cogging is nearly nonexistant with the Sidewinder.

	(#6)
MetalMan RC-Monster Mod Offline Posts: 5,297 Join Date: Mar 2005 Location: SoCal	08.26.2009, 03:26 PM There is a calculator: http://scriptasylum.com/rc_speed/_solver.html Ian is right, it will spin too fast. For a typical crawler anything more than about 5mph is useless IMO (your top speed would be about 10mph). And with the 4130 on that low of voltage I think you will have issues with cogging, which is the nemesis of a crawler. Here's the best I have come up with for a crawler: http://smg.photobucket.com/albums/v1...de/King%204x4/ You can see the evolution of my crawler, but unfortunately I don't have more recent pics up. Basically, it's got a kv of about 750, on 3s Lipo. Overall gear reduction including diffs is 16.9:1. Cogging is nearly nonexistant with the Sidewinder. SH Z-Car, Custom Crawler, 8s Savage, 12s XTM XLB 1/7 buggy, 4wd 4-link rear/IFS Pro4 truck, Custom Hyper 10 Short Course, Belt-Drive Mammoth ST 1/8 truggy, 4s 17.5 MM Pro HPI Blitz