[MHml] horsepower & sleds

[Diane Selkirk]

Russell_P_Davis at cox.net wrote:
> Gear shifting like modification of a jet ski for heavy tow service:
>
> An edutor can distribute the force of a high speed water jet over a large
> bulk of water so that much less power is lost in slip, turbulence and shear.
> I think the idea maybe to move a lot of displacement water - not heat up a
> little bit of water.
> Russell
>
>   
Yeah, (slight sarcasm) that's what you get with a propeller.  Large diameter is always more efficient.  That's why a big 32m tugboat may have a 2.5m diameter propeller.

Evan Gatehouse