Algodoo

150 nm @ 60 rad/s, 12hp. The weight is good too, only like 65kg. Great efficiency compared to some of your other engines! And there's still the awesome lack of vibration...

So, apply load to the engine until it slows down (but doesn't stall!) Then take the torque in NM and the speed (in rad/s, multiply it by 9.55 to get RPM) and multiply, then divide everything by 7124 and you get horsepower!

If that was hard to understand, here's an example.

I have an engine that can produce 1000 nm of torque at 50 rad/s. First we take 50 * 9.55 because it is in rad/s and we need to convert this to RPM, and we get 477 RPM. Now we just take the torque, 1000nm it this case, and plug everything into this equation -

477 * 1000 / 7124 = 66.956 horsepower!

I hope you got that

Haha I got it! And wow that is pretty good efficiency.. what is the HP per KG?

Just take your horsepower divided by weight, and you get efficiency. So 12 / 65 = 0.184 hp/kg. Pretty good! But I usually aim for ~0.6 hp/kg for my collide engines and 1 hp/kg for spawn engines.

Hehe, wow that's pretty cool! Thanks dude!