There is loss due to gears,maybe 20%.I dont know the exact amount,but a semi doesnt loose 200 horsepower to the ground.Maybe 50.So a 450 HP semi can put 400 HP to the ground,geared right.
Way back in the past like a steam engine or something,they didnt have a lot of horsepower.Seems like a steam engine might have 100 horse power,but it will pull a 10 bottom plow.It will only go 5 mph top speed.So its gears put more power to the ground,but loose speed.
If you want speed,you gear it up,so for every turn of your 15 horse engine,you want it to turn whatever is driving it faster.Say your 15 Horse engine turns 1200 RPM you want it to turn 3000 rpm out put into the trans mission,so you drive a gear that turns roughly 3 times faster that goes into the transmission.That means a big gear on the engine to a gear a third as big on the transmission,then you have an over drive trans mission.Probably a 30 speed transmission,geared right would do it,maybe 3 speed rear ends,which would give you 90 speeds.You would have to have a real low gear to get it started,might not barely see it move,all the way up to over drive.It would never climb a mountain,but it could move a load on flat ground.Lots of things do this every day.Like a crane.A 40 ton crane with an electric motor and some chains and gears moves 80000 pounds at a fast walking speed with whatever horsepower those electric motors have.It would surprise me if they were even 15 horse electric motors.
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