Surface Piercing Drive

[motoxbob11]

I run my Kyosho Twin Storm at a mountain lake and since I am the only person within 100 miles with a "fast" rc boat it generates a lot of intrest from the local campers. They ask me a bunch of questions and when they ask why the propellor is only half in the water instead of submerged like a real boat I really don't know what to tell them! You guys must know why we run these boats that way so let me know so I can sound like I know what I'm talking about!

[NorthernBoater]

Read this article.

http://www.offshoreelectrics.com/inf...propellers.php

[Mich. Maniac]

The main advantage that I can see and utilize is the adjustment to trim out the boats ride. kinda like a outboard. submerged props are kinda limited to where you put your weight and balance that with the power and prop selection. both can work very well but with the stinger struts adjustments can be made in micro adjustments and not have to move c.o.g. around too much.

[ReddyWatts]

Surface props

It takes a lot more horsepower torque to turn a submerged prop. It makes it good for pushing weight. We use a high rpm motor with lower torque. It does not push a lot of weight but handles great at higher speeds. Surface does have more slippage than a submerged but the higher rpm more than makes up for it.

[mike a.]

could it also be there is greater surface tension so the prop gets more push every time it stirkes the water and will have greater rpm because the prop is not fully submerged??

[motoxbob11]

Thanks so much guys I will sound like an expert at the lake! The article recommended by NorthernBoater was very well done and I learned a lot. The key seems to be the high rpm/low torque motors we use that make the props work well this way.