Prop Info

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    Posted: 30 Mar 2020 at 8:27pm
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Titanium
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Might help some fishos, I learnt lots here...

Interesting to be aware of grey alloy props that couldt be welded versus cast aluminium, and then the stainless recommended for every motor about 150 HP...

"The sea, once it casts its spell, holds one in its net of wonder forever." - Jacques Cousteau
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Post Options Post Options   Likes (0) Likes(0)   Quote Catchelot Quote  Post ReplyReply Direct Link To This Post Posted: 30 Mar 2020 at 9:03pm
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Titanium
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"The sea, once it casts its spell, holds one in its net of wonder forever." - Jacques Cousteau
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Post Options Post Options   Likes (0) Likes(0)   Quote Steps Quote  Post ReplyReply Direct Link To This Post Posted: 31 Mar 2020 at 9:44am
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Titanium
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grey alloy props that couldt be welded versus cast aluminium

These days an alloy prop is pretty cheap cheaper than getting welded and re balanced, and that a new prop.
 If shallow water, rivers, liable to hit a rock or log, small boats approx 5.5m, under about 1200kg total gross weight on water and general use (not required to pull a skier up or move at high speeds) the loading on a alloy prop and the amount of distortion under that load as to a SS is insignificant.

 Its not about the HP of the engine, it is about the load on the prop , a combination of hp and the weight that needs to be moved at cruise or under hole shot if the later is critical to end use of the boat.

Even a larger boat trawling for game fish will not need a SS, thu to move that hull weight to the fishing grounds at reasonable speed a SS would be of some benefit.. In saying that , ideally the prop to get to the grounds will ideally be quite different from that to trawl with.

 Funny how they make comparisons between 2 props different cupping, even different diameter . and yeah 1/4" will back a huge difference on smaller boat like that..
 Not only that change props , espec significant change in diameter (slip %) means its very likely the engine height needs to be changed as well...
 
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