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  1. #1
    grosbeak's Avatar
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    Dec 2010
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    Ottawa, ON, CANADA
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    DLE 20 - tuning

    I've got the DLE 20 in my Pulse 125 turning a 16 x 8 Xoar prop. I've got some numbers but I think they're a little low, so I'd appreciate a second (third, fourth etc) opinion:

    RPM @ WOT: ~7500
    Static thrust: 11.75 lbs

    Here's a clip of the throttle response.

    The first time I started the plane it stuttered when the throttle was opened and sometimes quit at full throttle. Per the DLE manual I opened up the High adjustment screw on the carb about 1/8 turn and it improved. If I open it too much further it starts to miss, which I assume means too rich.

    So, the questions.

    1. The manual specifies 2.5 HP @ 9000 RPM. I am running a recommended prop size. Should I expect 9000 RPM?
    2. I've seen other reports of the static thrust at 13-14 lbs... is 11.75 low enough to cause concern?
    3. I've backed off the idle to about 2000 RPM, but it's pretty shaky at that setting. Is this a good idle speed?

    Cheers!
    MAAC 83386
    Stetson Flyers, Ottawa
    G-RSBK

  2. #2

    Join Date
    Apr 2003
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    Hemderson, NV
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    RE: DLE 20 - tuning

    If you go into the gas engine forum there are pages and pages on the DLE 20. I have tuned a couple of them for friends at the field but never bothered doing any prop testing or static thrust testing with one. The one thing I have learned with all the DLE engines it toss the spark plug that came with the engine and install an NGK CM-6. That no name thing from China is about useless and creats a lot of problems.
    Drinking and driving are illegal, why do bars have parking lots
    Daisy Air Guns, keeping kids off your lawn for 100 years


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