What is it????

I wonder if it's mainly used for putting props back in shape after you bang them on the rocks..? hmm
 
Nope, the serious racers use them to modify prop shapes (mainly cup and pitch) to fit their particular hull, and engine characteristics. I believe the current RC straight away record is around 163mph (2-way avg) and is held by an electric hydro. nitro boats are around 130 I believe and gasoline in the 120 range. the fastest oval boats are in the 90-100 mph range.
 
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