Top speed calculator

Prepping and driving your Midlana at an autocross or trackday event.
Post Reply
Site Admin
Posts: 2884
Joined: 19 Dec 2008, 16:44
Anti-spam question: 4
Are you a spammer: No
Location: Southern California

Top speed calculator

Post by Midlana1 » 16 Sep 2013, 14:45

This calculator is fun to play with, though who knows how accurate it is ... 0Speed.php

If we assume 0.6* Cd, 17** sq. ft. cross-section, 1800 lbs, and 180 mph, it says I need 406 whp, which seems low. If I want to reach the perverbial 200 mph club, that would take 557 whp, 151 hp for 20 more mph...

* guess based upon an Atom, with a claimed top speed of 155 mph and with 300 hp. Figuring backwards that's a Cd of about 0.6. (keep in mind that top speed uses wheel horsepower in the math and not power at the crank).

** Counting tires, Midlana is about 6 ft wide. Total height is about 3.5 ft, or 21 sq ft, then subtract out about 2 sq. ft. per side for the empty areas above the tires and outboard of the body.

Now as to whether I'd actually ever try to drive that fast is another matter.

Post Reply