1988 Top Gun with #6 drives questions
08-21-2013, 08:19 PM
#31
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Not tomorrow but I'll guarantee if you leave a wanted ad in the classifieds and in the swap section you will find a pair at some point this winter. No need to find those exact props either cause you could tart with a set of 18" X 31-35P props, have Bblades cut them to 17.75 and make them 33P. Still come out ahead of buying brand new...
Last edited by 302Sport; 08-21-2013 at 08:31 PM.
08-21-2013, 08:25 PM
#32
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Interestimg read. I've got 1.48:1 #5s on 12" boxes turning in even with the running surface. Only running maybe 550hp a side currently with 17" dia 25 pitch 4 blades and it planes pretty hard esp with full fuel and people. Other than that it seems like it really likes the height. Also isnt bad at all at the docks. Only boat i could ever steer in reverse with complete control. Only once you really get agressive on the trim does it come alive. And throws one wicked rooster tail for such little hp. Blower motors in the works and contemplated going another inch up but im thinking just let it alone.
08-21-2013, 11:27 PM
#35
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I was told you can't truly add pitch to a propellor. You can make changes to the blades as far as blade area, cup, tip style, etc. but you can't make a 33p a 35p, you can just attempt to make it act like one as far as rpm goes.
Also, most pre CNC props, measure heavy in pitch. A prop stamped 17x30 might actually measure 17x30.5 or 17x31. I've had three sets of older Ssm 4 blades scanned on a prop scan machine. All were about 1/2" more pitch than stamped, and also very inconsistent from blade to blade as far as pitch and cupping. A good set of props goes a long way when it comes to the Ssm stuff. There's way more to it then what is stamped on the hub.
Also, most pre CNC props, measure heavy in pitch. A prop stamped 17x30 might actually measure 17x30.5 or 17x31. I've had three sets of older Ssm 4 blades scanned on a prop scan machine. All were about 1/2" more pitch than stamped, and also very inconsistent from blade to blade as far as pitch and cupping. A good set of props goes a long way when it comes to the Ssm stuff. There's way more to it then what is stamped on the hub.
08-22-2013, 12:51 PM
#37
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Thread Starter
So Ive got some responses sayin the prop should be equal or above bottom. and some say to leave it alone. I was hoping there was a proven set up for these #6 flat bottoms, but it seems every boat is different. Time to call Tres I guess and see what he thinks.
08-22-2013, 01:04 PM
#38
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Kevin call tres and ask him about his bottom modification that deals with the lifting strakes on 38 top guns. 3-5mph for a couple thousand dollars. Can't beat that...
08-22-2013, 01:18 PM
#39
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Any info on what is done? I don't think he does anything for just a "couple thousand"
