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Thread: Props

  1. #11
    Super Moderator couleeone's Avatar
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    Default Re: Props

    Quote Originally Posted by flybymike View Post
    Geo

    To avoid the red line issue, I just keep pulling the stick back.
    Mike,

    Sounds like you have a hot rod there! I like your final answer!

    Geo
    Geo
    Piper Cub J3
    www.cubdriving.com

  2. #12
    Senior Member Pete D's Avatar
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    Default Re: Props

    Quote Originally Posted by flybymike View Post
    Geo

    I had Lycon build the 0-200 with high compression forged pistons, port & flowed heads and precision balancing..
    I'm curious, did you swap out the cylinders or send them the whole engine? If you just do the cylinder swap and work in the heads then you still have the original rods and crank. Interesting to see how balanced that assembly is from the factory. If its anything like the heads then there is probably a lot of room for improvement.

    Pete D.

  3. #13
    Junior Member
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    Bend, Oregon
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    Default Re: Props

    Pete,
    I had Lycon build the entire engine with those options. They supplied all of the parts. I almost went with a single electronic ignition but was told that low altitude engines don't benefit much from that. I don't know how true that is but I can say that my engine with the 2 mags starts so easy it's scary, I never touch the prop with the mags on. It runs incredibly well and smooth. I do have a Dyna Vibe prop balancer which makes all the difference.

  4. #14
    Senior Member Pete D's Avatar
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    Default Re: Props

    What kind of plane do you have that motor on? It sounds like a well thought out build.

    Pete

  5. #15
    Junior Member
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    Default Re: Props

    It is a Kitfox SS.

  6. #16
    Senior Member Springloaded's Avatar
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    jupiter FL.
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    Default Re: Props

    Has anybody checked fuel consumption when changing cartridges on there prop. Mine 50 pitch 2000' 2450 IAS 97mph 6gal/hr 48 pitch 2000' 2450 IAS 92mph 7.5gal/hr. 50 pitch 300' 2200 4.5 gal/hr 48 pitch 300' 2200 3.8 gal/hr So at some point between 2200 & 2450 this prop becomes very inefficient.
    I would of thought less load better fuel burn. I knew my fuel burn was higher at cruise but never could put my finger on it. I recently finished a repairmans course and had never thought about changing the pitch at the root does not do it equally across the the entire length of the prop.So i am wondering what pitch our prop blades actually made to run at.As our instructor told us he recently did the math on customers plane that the tip of the blade was actually pushing backwards! I ask a Sensenich guy at a show he had deer in head light look. I am going to try and measure the blades do the math and see what pitch the blade was made to be.
    Chuck

  7. #17
    Member reileyr's Avatar
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    San Antonio, TX
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    Default Re: Props

    With a 48 pitch installed, my plane indicates 93 mph at 2375 60 OAT 3500' 5.4 gph leaned. Tack was tested/certified and it reads spot on. Higher propeller rpm results in higher airspeed and a higher fuel burn regardless of which pitch cartridge I use just like the power curves shown in TCM book. Fuel burn is a function of airframe drag just as it is in a car. Going faster requires more power and higher fuel consumption all else being equal. Drag is the square of velocity so going a little faster results in a much higher fuel burn.

    re prop tip pushing backwards, instructor's math sounds like urban myth. Tips do much of the work which is why Borer props are so popular on Super Cubs. The pitch at the tip is very flat since the tip is traveling at a high velocity. The pitch near the hub is very coarse as it travels at a slow velocity. The pitch angle continuously changes from hub to tip. Sensenich can tell you the exact station where the "48 inch" pitch is measured but I think it is about a third of the way back from the tip. Have fun playing with the math.
    Last edited by reileyr; 01-28-2012 at 04:20 PM.

  8. #18
    Junior Member
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    MSC Mesa, Arizona
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    Default Re: Props

    I agree, dynamic propeller balancing is a great way to reduce vibration levels for your aircraft.
    I use the DSS Micro kit which works very well for me.

    Morefield Aviation
    http://www.morefieldaviation.com
    Mesa, Arizona
    KFFZ CHD MSC DVT
    Mobile Repair Station

    Quote Originally Posted by flybymike View Post
    Pete,
    I had Lycon build the entire engine with those options. They supplied all of the parts. I almost went with a single electronic ignition but was told that low altitude engines don't benefit much from that. I don't know how true that is but I can say that my engine with the 2 mags starts so easy it's scary, I never touch the prop with the mags on. It runs incredibly well and smooth. I do have a Dyna Vibe prop balancer which makes all the difference.

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