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Old 14 May 2003, 07:04   #1
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any opinions on propeller guards?

dear ribbers,
while searching the net i found some probeller guards which it is something new for me .
here i post one photo for one of them...
is any one here used one ?
is it realy safe?

it doesnt influence the performance of the engine?

marios
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Old 14 May 2003, 08:10   #2
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Pro Guards

Hi Marios,

There is a company developing a fully enclosed pro guard and is being distributed by BHG Marine in Bucklers Hard Southampton.

I saw these guards at a Beulieu Boat Show earlier this month. The advertising blurb says that due to the shape will give additional thrust by forcing water through the guard. Slightly different to your picture in that it full encloses the prop itself.

The cost was 150.00 sterling for one of the larger sizes. and fits in the same way as the Doel Fins.

I my view because the prop is totally enclosed no finger or toes should get in!!!! However, I do not know if will increse performance. Will wait and see, I intend to buy later this year.

Regards
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Old 14 May 2003, 09:21   #3
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The ones that I have used have taken about 20% off the power they have had a front to them so that a boat going forward wont take some ones arm through the guard.

I would only use them if the boat is going to be in inexperienced hands, near a beach allot or being used as a safety boat.
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Old 14 May 2003, 10:43   #4
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Prop Guards
The ones I have come accross have generally reduced the the engines power by a third and meant you had to drill holes in you leg.
The surf rescue boys and girls use them as does the RN sailing safety boats. Also seen them used when you are working with cables in the water.

If you are that worried about catching things how about a jet drive? They are no substitute for decent driving as fingers and toes can still get to the prop or get broken in the mesh guard.
Jelly
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Old 14 May 2003, 10:49   #5
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I have used prop guards while working on the south coast as a lifeguard. The engines we were running were mariner 30hp and 40hp. The 30hp was for an "arancia surf boat" these boat are fully inflatible and designed for rescue in and around the surf line. The engine have been modified and run ss props, the props fitt inside the main ring on the guard and there is only about 1mm of gap around. This means low end cavitation is mare likely but top end speed is uneffected. The guards had more protection around the front part and extended back a little. The 40hp version were modifide and did not work as well. (sorry about the spelling)
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Old 14 May 2003, 16:58   #6
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one of the lifeguard team we teach has a 4m searider with a 40hp yamaha. It now has a propguard on with more enclosure than the one illustrated. Drops the performance considerably down to the equivalent of a thirty at least. Its used off a shingle beach and the reason is for people in the water obviously-but I have concerns about picking up a stone in the guard and it jamming in the metal basketwork and catching the prop.
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Old 14 May 2003, 17:28   #7
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my experience with props guards has only been one of a disappointment,

We have used them (various versions ) on our sea cadet Searider 5.4 with a Mariner 50 2stroke, it reduces the power (acceleration and top speed) by a very noticable margin! and frequently they have broken (most of the time broken off and been ir-retrevialble)

although a wise option if saftey is of a utmost concern! But i must state the obvious when I say that common sense and precaution in any eventuality / scenario is probably the best defence you have against fatality's
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Old 22 January 2004, 11:50   #8
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Re: Pro Guards

Quote:
Originally posted by Aging Youth


I my view because the prop is totally enclosed no finger or toes should get in!!!! However, I do not know if will increse performance. Will wait and see, I intend to buy later this year.

Regards
AY, did you get one of these in the end, I saw them at the LBS, and they claim that thier guard increases performance?

I wondered if thier claims were true or just advertising.
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Old 22 January 2004, 13:44   #9
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Prop Guards

Hi Gingercoastie,

Based on the Advertising Blurb and the feedback on Ribnet I decided not to fit a prop guard. I felt that there was no real benefit to be had. I spoke with my local lifeboat crew and they "DO NOT" have anything fitted to their engines.

Are you aware of any other Lifeboat Ribs who use a prop guard of any sort?

I can see the possible benefits to safety and protecting your prop from damage. However, I felt that the loss of performance & that no one else has used one; or if they did soon removed it. I felt it was not worth paying out for one. If I locate a second hand one I may try it out then, otherwise I will remain guardless.

Regards
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Old 22 January 2004, 13:47   #10
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Zapcats use them

Mind you they need them
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