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I'm not the op but I could use one. (: I'd like to try and print then cast a propeller like I described above. It would be nice to have a real race propeller to design off of.

If you print with ABS you run a greater risk of the part warping(depending on the competency of the person running the printer). A possible idea is to print it in PLA then cast it. If you print in...

What kind of motor do you use? (how many cylinders, 2 or 4 stroke?)

Looks like a cool way of racing, how fast does it take you to go 600ft?

I looked at some of the kart loggers but it seems they base speed on the wheel which doesn't apply on the water. Maybe they have a gps version somewhere.

I made a data logger module that takes a standard automotive tach wire for use with a custom mercury 44 ignition. It uses gps and the engine rpm to create a time log so the data can be graphed and...