Hi guys!
Sometimes I hear from experienced racers that the efficiency of a prop can be determined by the spray. Please explain how this works.
What should you pay attention to?
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Hi guys!
Sometimes I hear from experienced racers that the efficiency of a prop can be determined by the spray. Please explain how this works.
What should you pay attention to?
hq720.jpg
The shape of the roostertail can tell a lot about prop performance. A low, flat ‘tail indicates a narrow, efficient thrust cone while a high one indicates a wide thrust cone. The latter is usually seen from high lift props used to raise the aft of the boat.
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Here is a comparisson of Abc vs Octura, not perfect as one is a 1.85m boat and the other 1.5m but you can really see how high the Octura throws the spray, the green one in sport setup is a 100mph boat.
Abc on my Hpr150
Octura X470 cut down on my Hpr185
Hpr 06 / 09 / 150 /185, Mhz Skater H45 hydro.
Uk SAW record holder
A little confused. Chopper prop shapes produce high splashes, while cleaver shapes props flatter, low sprays?
Does high splash always mean an ineffective propeller?
Iv had my best speeds with gas cats & monos,,with big props run hi, on the transom , with a large spray , I run large pitch with much slip
Last edited by dasboata; 04-08-2024 at 09:33 AM.
Here is an old video where my boat was only running 92mph in this run but you can clearly see a pretty big water spray for that speed.
It is the same now as well but runs faster at 108 mph. I still feel a more narrow spray could give me more speed but need the transom way out of the water to prevent blow overs. Less spray more bite ???
https://www.youtube.com/watch?v=mvi9KIth-kg
PT-45 109 mph and climbing
H&M 1/8 Miss Bud 73 mph
Chris Craft 16 mph
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