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  1. #51
    flyingagin's Avatar
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    Thanks for the info 1QwkSport2.5r

    I would think that data should hold up for either drone engines or sport, since the only difference was a crappy carb, or at least I think that was the only difference.

    Ken
    \"As for Me and My House, We Will Serve the Lord\"
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  2. #52
    1QwkSport2.5r's Avatar
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    Quote Originally Posted by flyingagin View Post
    Thanks for the info 1QwkSport2.5r

    I would think that data should hold up for either drone engines or sport, since the only difference was a crappy carb, or at least I think that was the only difference.

    Ken
    Yes, you would be correct. I may modify one of the crappy carbs as an experiment to see if a little more airflow translates to more power from one of these guys. I do think the Sportsters get a bad rap like the Foxes do because of the long break-in, but they are such sweet running engines. Screamers they aren't, but they hand start so easy and idle lower than any engine I own. They do make a big mess though...
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  3. #53

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    Cool,

    you are still testing this engine

    you don't flip start it by hand do you?


    open exhaust?

    you took the muffler off?

    that was only good for 500 rpm?

    Was it LOUD???

    you did not try the wood 12 X 5 prop that came with the engine?

    I plan to remove the carb and replace with a .65 spray bar and needle valve in the carb mounting holes

    using a stretch tubing type bladder

    for control line

    Red line for this engine is 12,500 rpm from the spec sheet I sourced on line.

    I would like to prop it to get 12,000 in the air

    not sure about running a muffler

    I don't have to

    and lighter is better

    but how loud are we talking here?


    Thanks

    Buzz


    Quote Originally Posted by 1QwkSport2.5r View Post
    I got my hands on some "civilian" Carburetors for my Sportsters and went on a prop testing spree.

    74*F/64% humidity, 5%nitro 25% castor, McCoy MC59 plug, APC Props, factory sportster muffler.

    11x8 11,700/2,400
    11x9 11,600/2,280
    12x6 11,550/2,300 (12,000 open exhaust)
    12x7 11,100/2,100
    13x6 11,100/1,950
    13x7 10,600/1,950
    13x8 9,900/1,800

  4. #54
    1QwkSport2.5r's Avatar
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    Quote Originally Posted by buzzallnight View Post
    Cool,

    you are still testing this engine

    you don't flip start it by hand do you?
    Most of the time, I wet prime it and backflip start it. I do not like using electric starters on bushing engines.
    open exhaust?

    you took the muffler off?

    that was only good for 500 rpm?

    Was it LOUD???
    I ran open exhaust on only one prop as noted in my previous post. Only ran it that way as a test to see how much the stock muffler choked it down. Not much I noted. Loud? Incredibly. Also incredibly messy. Oil ALL over my test stand.
    you did not try the wood 12 X 5 prop that came with the engine?
    No. I do not use wood props.

    I plan to remove the carb and replace with a .65 spray bar and needle valve in the carb mounting holes

    using a stretch tubing type bladder

    for control line
    Good luck. The carb is held in by a single drawbar between the carb orifice and the cylinder. If you plan to run it as a CL engine, find a NV and Venturi that fits. I'm unaware of any that fit, this may need to be custom made.

    Red line for this engine is 12,500 rpm from the spec sheet I sourced on line.

    I would like to prop it to get 12,000 in the air
    The engine definitely likes to be loaded down. It will turn faster than 12,800 (the actual top rpm listed by Mecoa for the bronze bushed version) just fine, but it may not be happy. I didn't run mine that fast until I got 3 gallons through it where it was actually breaking in. Mine ran hot before that 3 gallon mark even at 10,000rpm. If it were me, and I want my engines to last, I'd be propping it heavy to turn around 10,500-11,000 on the ground MAX. You're just going to wear it out quickly if you prop it to run faster. This engine will turn a 14x6, but is happier turning a 13x6-13x8.

    not sure about running a muffler

    I don't have to

    and lighter is better

    but how loud are we talking here?


    Thanks

    Buzz
    I had ear protection on for my 12x6 open face run and it still gave me a headache. It's LOUD.
    Last edited by 1QwkSport2.5r; 08-19-2013 at 10:13 PM.
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  5. #55

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    Did you ever get your drone built and flyable?

  6. #56
    1QwkSport2.5r's Avatar
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    Quote Originally Posted by buzzallnight View Post
    Did you ever get your drone built and flyable?
    My wife and I welcomed our first baby to the world in March... So no I haven't. Probably next year. I have my little Norvel 1/2a trainer pretty much RTF with an OS FP .10 though. I gotta learn to fly first. LoL.
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  7. #57
    flyingagin's Avatar
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    Quote Originally Posted by 1QwkSport2.5r View Post
    My wife and I welcomed our first baby to the world in March... So no I haven't. Probably next year. I have my little Norvel 1/2a trainer pretty much RTF with an OS FP .10 though. I gotta learn to fly first. LoL.
    Congratulations on the addition

    Hey you know if you place a .65 Sportster next to the baby and take a picture, it belongs in the thread
    Just saying

    Ken
    \"As for Me and My House, We Will Serve the Lord\"
    Club Saito Member 775
    Club K&B Sportster
    Sig Kadet Brotherhood 15

  8. #58
    1QwkSport2.5r's Avatar
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    Quote Originally Posted by flyingagin View Post
    Congratulations on the addition

    Hey you know if you place a .65 Sportster next to the baby and take a picture, it belongs in the thread
    Just saying

    Ken
    LOL! I have two Sportsters, one in each hand! I'll clean up my slimy runner and see if I can get him to hold both of them... He's already sorta famous on Facebook thanks to my wife and her friends. The kid isn't even 6mos old and has a fan club of at least 50 people...

    I would at some point really like to put this pair of .65's on something. Whether it flies or floats, I don't care. I may end up flying the Mig-27 with my ST S90.
    GlowHead Brotherhood #3
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