Safety Propeller

[Sundays_Child]

Not quite sure it's as safe as is made out, but an interesting idea...

http://www.abc.net.au/tv/newinventors/txt/s2736928.htm

 

[Nick_H]

Agreed, I also can't believe it's anywhere near as efficient as a standard prop, even with the pressure relief hole in the middle of the blade. Bear in mind a SS prop is more efficient than an alloy prop mostly by virtue of being slightly thinner, and then factor that across to the safety prop with the bulbous tip form, and it seems inconceivable that there wont be a big loss in efficiency/performance. They say the prop spins as fast, but that doesn't mean the boat goes as fast

It's a nice idea for certain applications though, safety boats, tenders etc. where the safety benefits would outweigh the performance loss, and could be used in conjunction with the currrent prop shrouds for really safety critical requirements

 

[Sundays_Child]

I agree. I certainly like the idea for tenders ferrying children.

 

[oldsaltoz]

Agreed, I also can't believe it's anywhere near as efficient as a standard prop, even with the pressure relief hole in the middle of the blade. Bear in mind a SS prop is more efficient than an alloy prop mostly by virtue of being slightly thinner, and then factor that across to the safety prop with the bulbous tip form, and it seems inconceivable that there wont be a big loss in efficiency/performance. They say the prop spins as fast, but that doesn't mean the boat goes as fast

It's a nice idea for certain applications though, safety boats, tenders etc. where the safety benefits would outweigh the performance loss, and could be used in conjunction with the currrent prop shrouds for really safety critical requirements

Loss of speed was tested on a lake with zero wind, no tide, no current. GPS indicated a loss of 0.30 of a knot and less cavitation on take off.

Should also help save some wildlife.

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