On Sat, 10 Apr 2010 20:42:23 -0400, gfretwell wrote:

On Sat, 10 Apr 2010 18:35:09 -0500, thunder
wrote:

On Sat, 10 Apr 2010 18:39:41 -0400, gfretwell wrote:

The problem is there is no "simple device" that does this. Boat
manufacturers spend millions of dollars designing boats to reduce drag
and you want a parachute attached around the prop? (that would be the
effect of any prop guard) We have had this out a lot here in reference
to manatees getting prop scars. Nobody has had a reasonable answer.

But what if there is?

http://www.rbbi.com/pgic/ptech/safet...ypropeller.htm


You notice he is careful to rub the edge of the prop, not stick his foot
into the leading edge like a swimmer would do. Try it on your table fan.
Stick something in on the suction side, like the back of a prop when you
are in reverse.

It is also turning pretty slow, in the air without the suction of water
to multiply the effect


This is just lawyers running amok and adding to the price of every
boat made in the future.

Is it the lawyers, or the 30-40 Americans that are killed every year?
Injured or killed?

They were killed. The cite came from somewhere in that safety propeller
site.

In the grand scheme of things that is a pretty small number

What do you think the effect is on performance, fuel mileage etc?

If it can be believed, top speeds were reduced by less than .2 mph. Hey,
I'm not saying the "safety propeller" is the answer, but propeller
technology is definitely old technology. I can see improvements being
made, especially where loved ones body parts are exposed.

I know, screw the environment, global warming, dependence of foreign oil
etc if we can save a few stupid people from otherwise preventable
accidents.