I think maybe you mistyped something... Using a 5s battery, 40t spur and 29t pinion I show ~140ish mph. Probably still too high, but not quite 700mph.
Originally Posted by
rcwck
Stock gearing will get you ~35-40MPH on 4S. I think you will get some heat with 40/29 gearing. You might wanna rethink that set up. Using the MPH calculator below I get 700+ MPH on your set up. Your Lipos/esc will not like that gearing for sure. I race w/49/24 gearing and hit 55mph on the straight using 70C 4S and 2250KV.
http://www.scriptasylum.com/rc_speed/top_speed.html