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Old 11 September 2004, 02:41   #31
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Some of the old posts do recount people's own experience rather than being purely hypothetical, e.g. the thread titled 'Any opinions on propeller guards'. Others report on magazine tests. Might be worth another look while you wait for responses from current forum members?
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Old 11 September 2004, 02:44   #32
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Thanks Louise will do it again but is getting 9:30 here and have to get a RIB in the water in a while. Possibly later. Thanks again
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Old 11 September 2004, 04:57   #33
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Prop Guards

We had one fitted to our dive boat. It came as "a special offer" when we had the new engine put on. This was a plastic schulz nozzle design from propguard corp in the USA. It did reduce speed by about 5 knots.

It met its sad demise on rocks which is another thing to bear in mind in that if you do run aground the prop and the guard will be damaged, ours was completely destroyed with some tip damage to the prop.

We have not replaced it I'm sad to say, mainly due to cost. The speed loss was never subjectively tested as there appears to be a great deal of opinion spouted as fact without people saying ok lets test this and record the results on paper. What happens is beer is drunk and what seemed like perfectly clear facts suddenly arent?! Weird ey!!
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Old 11 September 2004, 06:26   #34
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Thanks Simon I thought that it is not possible to give you better performance (speed wise). It was just an idea for the hored RIBs to avoid propeller banging but will forget it. Better to change them over and do the repairs to the old ones.
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Old 11 September 2004, 09:47   #35
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Schulz Nozzle

Manos,

There is a theory that the schulz nozzle does allow the prop to be more efficient I dont know exactly how, this effect is used by this type of prop guard to make it in theory at least, able to operate without loosing speed. It is supposed to be a tunnel wing used underwater I think.

I would hazard a guess though that the increased appendage drag does means speed will be lost at higher speeds. Though slow speed manouvrebility may be better.

Again it really falls to more exhaustive testing to prove either way or an expert in the field to shed more light, my green blobless status is sadly a reflection of my paper thin veneer of knowledge.
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Old 26 October 2004, 02:49   #36
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Another Sad Accident..

http://www.sky.com/skynews/article/0...156953,00.html
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