5-Blades
03-30-2004, 09:55 AM
#11
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Marty, My prop CL is dead even with the bottom of the sponson.
Ken, You are soo right with the performance. On a lake, you cannot beat them. We ran the north Dallas lakes for the last three years, I just moved to Austin - Lake Travis is a decent size lake and we shock people with the performance and sound - (dry tailpipes), as long as no one shows up with a twin engine cat.
Matt, are the P5X propellors lab finished, or is there a need. Since I have a light weight cat on a lake and I do air it out, I would think that I can go pretty thin on the blades to get the most out of it. From a goal perspective, I am looking for 1. accelleration from 50-90, 2. top end, 3. mid range cruise speed.
If I reduced my slip from 16% to 6 percent, that should be close to 10 mph - worth paying big $$$ for. I am at a point that I believe the setup is as good as it is going to get - hull is blueprinted, can't go any higher with the x-dim without drastic changes, and I have an extension box. The alternative is to throw lots of HP at it and overpower the problem.
Ken, You are soo right with the performance. On a lake, you cannot beat them. We ran the north Dallas lakes for the last three years, I just moved to Austin - Lake Travis is a decent size lake and we shock people with the performance and sound - (dry tailpipes), as long as no one shows up with a twin engine cat.
Matt, are the P5X propellors lab finished, or is there a need. Since I have a light weight cat on a lake and I do air it out, I would think that I can go pretty thin on the blades to get the most out of it. From a goal perspective, I am looking for 1. accelleration from 50-90, 2. top end, 3. mid range cruise speed.
If I reduced my slip from 16% to 6 percent, that should be close to 10 mph - worth paying big $$$ for. I am at a point that I believe the setup is as good as it is going to get - hull is blueprinted, can't go any higher with the x-dim without drastic changes, and I have an extension box. The alternative is to throw lots of HP at it and overpower the problem.
03-30-2004, 03:06 PM
#13
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John,
I think you should try the P5X stock and then see how it runs on your boat. If you like it and it performs well then you can consider lab finishing.
What I have been so pleased with, is that the P5X runs outstanding right out of the box. We have seen very impressive top speeds with the P5X and it holds it's own against lab finished Bravo 1's.
I think you should try the P5X stock and then see how it runs on your boat. If you like it and it performs well then you can consider lab finishing.
What I have been so pleased with, is that the P5X runs outstanding right out of the box. We have seen very impressive top speeds with the P5X and it holds it's own against lab finished Bravo 1's.
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03-31-2004, 10:05 PM
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-3 lower - I had a blackhawk at one time with a 3" rise extension box - it was much too high. The blackhawk ran the best mounted to the transom w/ out the box
03-31-2004, 10:58 PM
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New Props
John,
Yesterday my Cat received a big box from Washington and inside were a pair of Hering 6 blades. I, like you was having too much slip and this is supose to be the answer to that .. The only thing is that they are so damn pretty that I'm sorta of afraid to put them on. They come labbed right out of the box.Im told that this will cut my slippage down to around 6 to 7 percent.
Big power,130 ratio B-maxs with ext. boxes. Only time will tell, will let you know whenever summer gets up here to Yankee land
Best of luck which ever way you go!!
eliminator219
Yesterday my Cat received a big box from Washington and inside were a pair of Hering 6 blades. I, like you was having too much slip and this is supose to be the answer to that .. The only thing is that they are so damn pretty that I'm sorta of afraid to put them on. They come labbed right out of the box.Im told that this will cut my slippage down to around 6 to 7 percent.
Big power,130 ratio B-maxs with ext. boxes. Only time will tell, will let you know whenever summer gets up here to Yankee land
Best of luck which ever way you go!!
eliminator219
04-01-2004, 07:48 AM
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Matt, I just calculated my slip:
Top speed - 16% 1.36 / 30 / 5750 rpm / 103 mph
Cruise - 12% 1.36 / 30 / 3500 rpm / 65 mph
At 8% that would be a dramatic increase
Top speed - 110 mph
Cruise speed - 67 mph
Is this correct by your calculations? Keep in mind 103 is the best I get out of the boat with the good wind, conditions, etc. 101 is typical on any given day, wind, water, people, etc.
Top speed - 16% 1.36 / 30 / 5750 rpm / 103 mph
Cruise - 12% 1.36 / 30 / 3500 rpm / 65 mph
At 8% that would be a dramatic increase
Top speed - 110 mph
Cruise speed - 67 mph
Is this correct by your calculations? Keep in mind 103 is the best I get out of the boat with the good wind, conditions, etc. 101 is typical on any given day, wind, water, people, etc.
04-01-2004, 08:43 AM
#20
Just a thought,
I think Matt will have you use different numbers for slip calculation rather than the 30 for the Bravos; maybe 28.5.
Also less slip uses more hp/trq. In other words if you drop to 8% you wont turn as many rpm and you'll have to drop in pitch.
I'm sure Matt can explain this better.
I'm anxiously awaiting my new P5-X
Dave
I think Matt will have you use different numbers for slip calculation rather than the 30 for the Bravos; maybe 28.5.
Also less slip uses more hp/trq. In other words if you drop to 8% you wont turn as many rpm and you'll have to drop in pitch.
I'm sure Matt can explain this better.
I'm anxiously awaiting my new P5-X
Dave
