RC Boat

[EricH]

Originally Posted by IndySam

BTW you can not use airplane radio frequencies for surface use so you will have to change crystals.

Showin' yer age, mate. If it's a 2.4 GHz system, like most of the newfangled control devices these days, you're probably OK. Just double-check the restrictions before you get the system.

(And yes, I do know how aircraft frequency control is supposed to work at a given flying field. I have also heard about what happens when a boat is using an aircraft frequency near a flying field, many years ago and very ugly the incident was.)

[Josh Drake]

Your propeller choice looks similar to something we use at work to agitate molten aluminum.

[DonRotolo]

That propeller is a mixing propeller. Yes, it will work, but not nearly as well as a propulson propeller. R/C boat props are easy to find if you look in an R/C boat store/web page

I think you will find that 30 rev/sec will cavitate badly. But try it anyway: With the prop chucked into a drill see what happens in a bucket of water.

5'/sec for a 2' boat is about 75'/sec for a 30' boat, which is (scaled) racing speed. Maybe a little slower should be considered. A 2:1 slip is very high, in practice much lower is reasonable.

Your hull design needs to have a way for water to get to the 'pull' side of the prop, leaving a 1" vertical space is not enough. If you look at a real boat you'll get the idea.

When building your boat be sure you consider the center of gravity (and center of flotation) very, very carefully, or your boat will flip over as soon as you try to turn. Real boats use steel or lead in the keel for weight.

An alternative: Consider building a 'swamp boat' which uses an air fan for propulsion.

Regardless looks like a fun project. Good luck, take pictures and post them here!