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WP0ZZZ's Avatar
Join Date: Jun 2017
Location: ROW
Posts: 239
Originally Posted by jpnovak View Post
The Thrust curves are calculated from the torque (dyno) curve. Torque (ft-lbs) is converted for each gear ratio into thrust (lbs). The gear ratio gives you the distance traveled per revolution to cancel the (ft) component. The RPM component is also converted to speed using the gear ratio. Its a relatively simple conversion and exceptionally useful.
Unless I'm mistaken, Bill's plots also incorporate the effect of aerodynamic drag which increases quadratically with speed. This explains why the thrust curves for different gears are not scaled versions of each other.

In fifth gear, aero effects become important at high speeds and this explains why net thrust decays more than in first gear. Maximum speed is reached when net thrust becomes zero.
Old 02-02-2018, 09:08 AM
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