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Thread: Small Inflatable Prop Question

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    Member tyrex13's Avatar
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    Default Small Inflatable Prop Question

    I bought an Alaskan Series 380A and a new Honda BF20 short shaft this year. It's a sweet little combo and I hope to take it on many adventures. I've only had it out once this year and while the motor ran great I was less than impressed with it's top speed. I was only getting 14-15 mph on the GPS and once I got on step (which was fast and easy) my speed didn't increase any from a little over half throttle to full throttle. My load was only maybe 650 lbs total including 2 men, fuel, motor and gear. Can anybody make some prop recommendations or should I leave it be?

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    How long is your boat? ridgid hull or semi?

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    I suspect that you are way under propped and you are hitting the rev limiter. You really need a tach to properly prop it. What prop are you currently running?
    Spending my kids' inheritance with them, one adventure at a time.

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    Stock standard 4 blade aluminum prop 9.25"x10p

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    I have a 15' old Avon and with close to 700-800 lbs of cargo i can cruise at 20 mph i cant hit the limiter, the boat pretty much plows, but the only way I could even get the thing to move is put on a hydrofoil, before that it would cavitate bad! The motor is a 20 ho yamaha short shaft.

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    Member tyrex13's Avatar
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    Quote Originally Posted by spoiled one View Post
    I suspect that you are way under propped and you are hitting the rev limiter. You really need a tach to properly prop it. What prop are you currently running?
    Has anybody tried the Tiny Tach, or should I look at something else?

    http://www.tinytach.com/tinytach/gasoline.php#

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    Quote Originally Posted by tyrex13 View Post
    Has anybody tried the Tiny Tach, or should I look at something else?

    http://www.tinytach.com/tinytach/gasoline.php#
    Any tach like that will work fine? Can you get the motor wrapped up at all? Do you have any cavitation?

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    Quote Originally Posted by tyrex13 View Post
    Has anybody tried the Tiny Tach, or should I look at something else?

    http://www.tinytach.com/tinytach/gasoline.php#
    That will work fine. Another thing to check is the mounting height. You could be mounted too low. I have a 10 foot RIB with F15 for my tender. I need to raise it up a bit. At cruise, it is well below the surface. A planing fin, like Kevin mentioned, would be a nice addition to your set up as well.
    Spending my kids' inheritance with them, one adventure at a time.

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    Quote Originally Posted by kevin476 View Post
    Any tach like that will work fine? Can you get the motor wrapped up at all? Do you have any cavitation?
    Yes, it seems to rev up fine, but without a tach I'm really guessing. Like I said, it gets on step fast and easy, but top speed is less than I expected. It didn't seem to have excessive cavitation, but I will pay more attention next time.

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    I have a tiny tach on my cummins, its a little different than what you would get, but you can check it out next time your in town.

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