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A little perplexed with 3W

Discussion in 'Gas Engines' started by acerc, Feb 15, 2019.

   
  1. Snoopy1

    Snoopy1 640cc Uber Pimp

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    That is a tough question and one I would not like to answer, but is it worth the risk it may work for ever but just once it doesn’t the results could be horrendous. So please if I may suggest just go and buy a new wooden one try it.
     
    49dimes likes this.
  2. Snoopy1

    Snoopy1 640cc Uber Pimp

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    Acerc looking at specifications of the two motors they both have the same bore and stroke 49-40mm but the maximum rpm for the DA is 6500 rpm and the 3W is 8500 rpm. Maybe the propeller size is correct but will turn that one or two thousand rpm more which in turn will produce the same or even more horsepower. It could that motor is designed to run at a higher rpm level. Just did a little math and if you take the propeller size 3W recommends and the delta in rpm from the spec sheet it produces more power than the DA. Please note this just and extrapolation the specifications of the motor spec sheets.
     
    49dimes likes this.
  3. Ive done that on 27 in prop and had no problems as long as your in the middle of the holes already there you should be fine dont forget to rebalance though
     
  4. 49dimes

    49dimes Damn I'm hungry

    The 3W 150's I flew I ran a Menz 30x10. Decent spool up and gobs of torque. As best I can remember spun static in the 66/6800 rpm range. Pulling force was brutal!
     
    dhal22, acerc and WMcNabb like this.
  5. Bartman

    Bartman Defender of the Noob!

    If I had to guess, I'd say 3W used the next smaller engine's manual as the basis for the 150's manual and forgot to update the prop detail before publishing it. Have fun with it.
     
    49dimes, thurmma and acerc like this.
  6. acerc

    acerc 640cc Uber Pimp

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    I have been running Falcon ever since trying to get the Valach 170 to where I thought it should be. I have tried numerous brands and in my opinion the Falcons are lighter and have a better airfoil. I have found people running anything from a 28x14 to a 31x10, none of which were a Falcon, so I went and ordered a Falcon 32x10. If it works, great, if not the rpm's will tell me which way to go and hopefully only be one prop away.
    I appreciate everyone's input.
     
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  7. dhal22

    dhal22 GSN Sponsor Tier 1


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    This.
     
    49dimes likes this.
  8. I used to run a Mejzlick 32x10 on my old 3W TOC 150 and it loved it! What a beast of an engine :)
     
    acerc, Snoopy1 and 49dimes like this.
  9. stangflyer

    stangflyer I like 'em "BIG"!

    Just catching up a little fellas.... So here is my take on the 150. Obviously the predecessor to the 157, it will have nearly the same output as the 157. You may notice a slight rpm difference. But not enough to go bananas over. My 157cs twists a Falcon CF 32x10 at about 6600 static. In the air, it unloads and sounds amazing. The 28x12 is on the conservative side of break in prop sizes. If the motor is in good shape, and the carb is dialed in properly... and good exhaust, there is no reason you can't see at least a minimum of 6000 or way better.
     
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