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It looks to me that this is rated at around 23 HP for 2 minutes. Typical derating would be about 1/2 that for 5 minutes (400 amps/22v) and another 1/2 for a 1/2-hour rating (200 amps/22v). Rough estimates. That's about 5.8HP, which is good for about 25 MPH (eventually...) in a 1500 pound car on a level road. Again, this is a rough estimate, and depends on many other factors.
At 25 MPH the motor will be turning about 2870 RPM and IMHO the top speed available with this setup/HP. It will probably be relatively slow to accelerate, but would be good to hold a speed once it is accelerated there by the IC engine. Under load the compound motor may not be able to attain much more than 3000 RPM - they tend to self-limit - and you are wise to consider some sort of mechanism that will prevent the vehicle from overspeeding the motor.
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