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  1. #1
    2robinhood's Avatar
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    GP Super Stearman with 50cc build

    I am going to start a build thread on the Great Planes Super Stearman with a CRRC Pro GF50I ( 50cc gasser ).
    First things first, YES I know it is over power.
    I have the two sitting and figured I will match them together.
    I DO NOT plan on sreaming this plane wide open down the runway. The only time I am going to do any wide open is going to be in the verticle postition.
    Well I am going to shot my expected weight of 16 1/2 lbs. ( dry ) and we will see how close I will be when it all is together.
    I also am installing a full smoke system in the aircraft.
    This plane should look awsome doing stall turns and monster loops with full smoke on.
    These are some weights as the are now.

    Built fuselage ( no radio or tank ) has landing gear, wheels, wheel pants, tail whell assy, all surfaces, deck, windsheilds, pilots
    73.5 oz.

    Top wing, bottom wing with all mounting braces.
    65.5 oz.

    Cowling, spinner, fuel tank, hardware, quick filler, fuel line
    19.0 oz.

    Servos:
    Four Futaba S3305
    One Futaba S3004
    Extensions and switches
    One 6V 2000 mah battery
    Futaba FASST RX
    Opto kill switch
    11.5 oz.

    Full smoker sysytem:
    Sullivan Skywriter
    20 oz smoke tank
    6V 2000 mah battery
    switch harness
    15.5 oz.

    CRRC Pro GF50I
    Ignition, muffler, switch harness and ignition battery
    62.5 oz

    Prop, custom stand offs and mounting bolts
    8 oz.

    I will do pictures as I go along and do some numbers as I break in the engine.





  2. #2
    2robinhood's Avatar
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    RE: GP Super Stearman 50cc build

    Here are some pictures of the mount I am making to hold my smokers assy.




  3. #3
    2robinhood's Avatar
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    RE: GP Super Stearman 50cc build

    Engine is a CRRC Pro GF50I
    I purchased the Pitts muffler and am going to use it on this project.

    Specs:
    Displacement: 50cc
    Bore x Stroke: 43mm x 34mm
    Dry Weight: 1660g (3.63 lbs.)
    Carburetor: Walbro butterfly type w/pump
    Max Output: 4.9 HP @ 7500 rpm
    Ignition: 4.8v Auto Timing Ignition
    Fuel: 93 plus octane premixed 40:1
    Propeller: 20 X 10 , 22 x 10 ,22 x 8






  4. #4
    Nathan King's Avatar
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    RE: GP Super Stearman with 50cc build

    It looks good. I know this model requires ballast up front, but won't that 50cc be a little bit too much weight up there (requiring tail weight)?
    AMA 861014 | NSRCA 4460
    Class 402 Intermediate | District 5

  5. #5
    2robinhood's Avatar
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    RE: GP Super Stearman with 50cc build


    ORIGINAL: Nathan King

    It looks good. I know this model requires ballast up front, but won't that 50cc be a little bit too much weight up there (requiring tail weight)?
    I plan on mounting my smoker assemely and batteries towards the tail. I think I should be OK by adjusting my extra items around without adding weight.
    The GP Stearman needs 18 oz. of added weight to the nose to ballance with a OS 1.20 four stroke.

    OS 1.20 + 18 oz of lead = 51.5 oz.

    CRRC 50cc with muffler and ignition = 58.5 oz.

    I think I can overcome the extra 7 oz. being on such a short segment in front of the CG.

  6. #6
    Nathan King's Avatar
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    RE: GP Super Stearman with 50cc build

    Cool. It sounds like you've planned things out well. I can't wait to see it finished!
    AMA 861014 | NSRCA 4460
    Class 402 Intermediate | District 5

  7. #7
    2robinhood's Avatar
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    RE: GP Super Stearman with 50cc build

    Just a fast update.
    I am using Robart pin hinges instead of the CA hinges.
    Ailerons are the 3/16" pin hinges, while elevator and rudder is 1/8" pin hinges.
    Fuel tank set up, of coarse a gasoline stopper, walbro felt filter/clunk, and Aerotrend easy flex gasoline fuel line.




  8. #8
    2robinhood's Avatar
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    RE: GP Super Stearman with 50cc build

    Pretty much got the smoker assembly finished.
    Unit is assemled, mounting rails are in fuse.
    Just need to mount the switch and fuel dot for the smoke tank.
    I used velcro between tank and mounting plates, between smoke pump and tank, between battery and tank.
    Then used zip ties to secure everything.
    Assembly as you see it with a switch harness is 16.3 oz.





  9. #9
    2robinhood's Avatar
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    RE: GP Super Stearman with 50cc build

    Just took my CRRC Pro GF50I ( 50cc ) out of the box.

    After 8 oz. of fuel run, needles at factory settings, I did some quick 5 second burst of wide open for some rpm numbers.

    Xoar 19 X 8 @ 8200

    Xoar 20 X 8 @ 7500

    Zinger Pro 22 X 8 @ 6900

    APC 22 X 10 @ 6700

    JFX 23 X 8 @ 5600

  10. #10
    2robinhood's Avatar
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    RE: GP Super Stearman with 50cc build

    New numbers for the CRRC 50cc:

    After 16 oz of fuel run.

    Xoar 19 X 8 @ 8400

    Xoar 20 X 8 @ 7900

    Zinger Pro 22 X 8 @ 7100

    APC 22 X 10 @ 6900

    After 24 oz of fuel.

    Zinger Pro 22 X 8 @ 7200

    Vess 22B @ 6800

    Majzlik 22 X 10 @ 6800

  11. #11
    Nathan King's Avatar
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    RE: GP Super Stearman with 50cc build

    Those numbers look really good to me! [8D]
    AMA 861014 | NSRCA 4460
    Class 402 Intermediate | District 5

  12. #12
    2robinhood's Avatar
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    RE: GP Super Stearman with 50cc build

    Update:
    A little further, engine is mounted, wings are on, and control surfaces are glued.
    Next will be plumbing smoke lines and control linkages.







  13. #13
    2robinhood's Avatar
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    RE: GP Super Stearman with 50cc build

    Got a little more done.
    Mounted servos and Opto kill switch.
    Each elevator half has it's own servo, instead of connecting two pushrods together.
    Hardest part was getting the throttle linkage past the smoke system and having it get the throttle to stick position correct.
    I put the wings on for a quick balance check.
    No RX battery or ignition battery in in yet, and it balanced perfectly to the manuals CG.
    I should be ok, and able to adjust batteries around and not ad any weight to the plane.



  14. #14
    2robinhood's Avatar
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    RE: GP Super Stearman with 50cc build

    I'm still alive.
    Just been trying to get my 33% in the air.
    I'll keep you posted.

  15. #15

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    RE: GP Super Stearman with 50cc build

    This just looks like it will be a disapointing disaster.Thats just my thought on this.But its almost done,might as well finish it.
    Just my opinion,and easily ignored

  16. #16

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    RE: GP Super Stearman with 50cc build

    DA-50 is what I had in mind since I have an extra one sitting on the shelf. My only concern is prop-clearance (I live in Colorado and am not too worried about over powering). 2Robinhood, I can't tell by your photos, but what size Mejlik prop do you have mounted, and how does your clearance look to the ground (at least 2-3 inches?)
    Thanks
    Shaz

  17. #17

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    RE: GP Super Stearman with 50cc build

    woops, just noticed you have a 22X10, thats GREAT! How's clearance?[sm=thumbs_up.gif] or [sm=thumbs_down.gif]???

  18. #18

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    RE: GP Super Stearman with 50cc build

    Hi,
    I'm not sure if you’re going to use 2 or 4 servos in the wings. There seems to be a lot of debate about the subject. I guess it comes down to personal preference. I'm using 4 servos and it flies great.
    A word of caution if you don’t already know it…When you assemble the wings and horizontal stab make sure they are at”0” degree incidence to each other before gluing and screwing. You may have to force the top wing to the ”0” position before screwing the bracket down but if you don’t your going to have a lot of problems with it. I know I didn’t realize it was going to be off and I ended up making and installing wood shims to bring the top wing to”0”.

    Another thing…RCU changed their format for the forum [sm=confused.gif]and there is a long forum that goes back a few years, can anyone point me in its direction.
    I posted some instructions and pictures on how I assembled the Y connect in the wing before I put them together which leaves you with only one connector to plug in. I read it in the long Stearman forum I’m looking for, it works great.
    There again I can't find it, so I can’t tell you were to got to see it.
    Anyway Thanks and Happy Landings!
    Shubova
    [8D]


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