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MetalMan
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11.18.2007, 11:25 PM

Quote:
Originally Posted by suicideneil View Post
12:1 FDR? that does sound rather high for a large MT type vehicle- and only 28,000rpms on 12cells. Im no expert, but that sound like an under powered & overgeared setup... I could be wrong though.
Quote:
Originally Posted by BrianG View Post
Yeah, I think that FDR is abit high too. Also, look at the total motor speed in MM's post; 28k rpm. You'd need to gear up pretty high to get the speed you want with that motor speed. I would suggest going with higher voltage or slightly higher kv motor to get rpms in the 35k range. Then you'll see you won't need such high gearing.
With the Revo that Lincpimp has now, I ran a 7XL on 5s2p A123 with 20/46 pinion/spur. It had plenty of power, and 40mph top speed was enough for me. The 7XL ran at a good temp, but as Lincpimp noted, the MM runs hot.


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
   
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