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Joey · 03.07.2009, 12:14 AM

My attention was brought to this speed/gearing calculator and it is amazing. I used it to get the following numbers...

http://www.scriptasylum.com/rc_speed/_top_speed.html

For savage diffs, center diff, 48T spur, 14T pinion, feigao 8XL (2084 kv), 16.8V nimh (I know.. I know...), and bow tie MTR tires I get:

-- Total Motor Speed: 35011 RPM
-- Theoretical Maximum Vehicle Speed: 51.89 MPH

With 9XL (1853 kv) it is:

-- Total Motor Speed: 31130 RPM
-- Theoretical Maximum Vehicle Speed: 46.14 MPH

If I switch it to the e-savage tranny the speeds drop by over 50%, so higher KV motors and gearing changes would be required for that. Im sure the actual speeds would probably drop by about 10% due to losses, so its probably more like 47 mph and 41.5 mph. I would be more than happy with either!

	(#7)
Joey The Big Cheese Offline Posts: 125 Join Date: Mar 2009 Location: Georgia, USA	03.07.2009, 12:14 AM My attention was brought to this speed/gearing calculator and it is amazing. I used it to get the following numbers... http://www.scriptasylum.com/rc_speed/_top_speed.html For savage diffs, center diff, 48T spur, 14T pinion, feigao 8XL (2084 kv), 16.8V nimh (I know.. I know...), and bow tie MTR tires I get: -- Total Motor Speed: 35011 RPM -- Theoretical Maximum Vehicle Speed: 51.89 MPH With 9XL (1853 kv) it is: -- Total Motor Speed: 31130 RPM -- Theoretical Maximum Vehicle Speed: 46.14 MPH If I switch it to the e-savage tranny the speeds drop by over 50%, so higher KV motors and gearing changes would be required for that. Im sure the actual speeds would probably drop by about 10% due to losses, so its probably more like 47 mph and 41.5 mph. I would be more than happy with either!