What to expect out of 15 HP 2 Stroke Johnsin on Classic

Discussion in 'Prop Shop' started by tcjmiami, Apr 19, 2009.

  1. tcjmiami

    tcjmiami I Love microskiff.com!

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    I have a 2002 Classic with a 15hp 2002 Johnson 2 stroke.
    I am getting 21MPH at WOT out of the boat with two people, 90lb dog and fishing gear.
    The speed was confirmed by two GPS so it must be real.
    I guess the total load at 600 pounds and that is what I would expect to be normal in the future.

    Is this normal?
    Do I need to get a Tach to check the load on the engine?

    I am getting a spare prop and just want to know if I should just match this AL prop or upgrade to a Stainless prop.

    Thank you for your help.

    TOM
     
  2. Brett

    Brett > PRO STAFF <

    horsepower weight speed calculator link:

    http://continuouswave.com/cgi-bin/crouchcalc.pl

    Get a tach, don't guess, it's the best way
    to make sure you get the most out of your outboard.

    With a guesstimated total weight of 800 lbs (boat, motor, gear, people)
    15 hp returns about 25 mph per the calculator.
     

  3. Tom_C

    Tom_C Well-Known Member

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    21 is good for 15-6 a 15 mounted on the trasom with the load you have.
     
  4. Kemo

    Kemo The world is flat....and shallow.

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    I GPS'd my LT25 last week with my Johnson 15 2-stk at 23.8 mph. Two guys and gear. I was ecstatic!! Probably 150 lbs less, though, without the dog and I only weigh 148, my buddy about 175. Still, I'm looking to improve this speed a bit. Not so I can run WOT all day, but to run as fast as possible at about 2/3 throttle and use less gas. Don't know the weight difference between the classic and the LT25. My LT has low front deck and is pretty much a frugally rigged boat.

    Kemo :cool: