[RC-Monster Mike]

When a big boat running high power hits a wave at 50+ mph and comes out of the water, the prop revs out. When the prop re-enters the water, you have a tremendous amp spike - huge load. And while the boat is in the water, the load is much more constant - as well as constantly higher load (water is constantly around the prop - boats don't coast or roll like cars, so there is always a substantial load on the system). Ever try to run in the pool? Tough to go fast due to all the drag. :)