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Here's a 3hp model plane motor. It weighs 750g all up. http://www.hobbyking.com/hobbyking/store/__9969__Turnigy_26H...

And here's 3hp electric motor (550g), although that's probably an unfair comparison. http://www.hobbyking.com/hobbyking/store/__18177__Turnigy_Ae...

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The horsepower ratings of engines in the hobby world are optimistic at best. I have personal experience with some RC airplane engines and a dyno, and frankly I don't understand how the manufacturers can keep advertising the numbers that they do.

I have personal experience with RC electric motors and dynos and they are correct.

Source on that? Never heard anyone claim the numbers on these motors were fake before.

I believe those have thermal problems, use more fuel and have a shorter lifespan?

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