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Thread: gear,prop,speed?

  1. #1
    blownschiada
    what kind of top end speed am i looking at running 1:38 gears spinning about 6500 rpm with a 11 1/2 15 menkens prop in a 19 foot schiada? Would more pitch make the boat leave harder (less cavatation)?

  2. #2
    schiada96
    I guess around a hundred. I don't know about what more pitch would do. I run a 11 3/8 x 16.5 with a 45 gear.
    Stupid smiley frown face
    [This message has been edited by schiada96 (edited April 25, 2002).]

  3. #3
    Costello
    Schiada96, 16.5 pitch!! Doesn't that make the v-bottom Schiada a little loose and racey at WOT?

  4. #4
    DetroitJim
    For what it's worth, I may be an idiot but I'm running an 11 x 17 Menkens 2 blade with a ton of rake on my flatbottom. It doesn't seem to behave any different than a 11.25 x 15 Stelling SK other than a few hundred RPM.
    DJ

  5. #5
    schiada96
    Costello I need some help on the setup, yes it gets loose but most of the time it's pretty stable. Shit I didn't know anything about a boat until I built this one. I'll try to get Lee to take a ride in it soon. You know all of the people I know. Last time at parker we were playing with the timing, and Dennis tole me to make sure it was a little looser when I gassed it well its was loose so much so I stood it way up, It scarred me pretty good. On the way back to camp I ran a HTM purple with yellow flames I had him for a long way then He ran me down. Yes it probably needs a pro to check the setup

  6. #6
    Costello
    Schiada, I'm no expert, but I hear of most cruisers running props in the range of 12 x 15 or so as pretty much standard. I know that the bigger pitch will give more lift and thought by deductive reasoning, that there must be a reason most guys don't step up to 16 or more with the v-bottoms. I figured they would want to get a little looser with more pitch. I run a 12 x 14 currently, I'd like to try a nice 12 x 15. i was going to try the one Dennis has on his boat now, but it got grenanded and traded before I could try it!! http://free.***boat.net/ubb/biggrin.gif
    [This message has been edited by Costello (edited April 25, 2002).]

  7. #7
    mister460
    "Loose is fast and on the edge of out of control!"
    C'mon guys, what's that one from???

  8. #8
    boat030
    "Day's of thunder" that was too easy

  9. #9
    63stevens
    the formula for determining speed is: rpm x pitch x v-drive% x .00094976 minus precentage of slippage. usually figure in 15-20% of slippage. with the numbers you gave your speed with 20% slip is 107mph. If you want to be more accurate buy yourself one of those handheld GPS'. They are only about $100.

  10. #10
    mister460
    Okay, check this one out Boat030!!! "Last one to kill a bad guy buys the beer!" Ha! Figure that one out!!

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