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  1. #1

    Great Planes SU-31 3D + 30 size 4-stroke!

    I think that this is going to be my very first post here at RCU. So, Hello all!

    So here we go. I am going to convert this Great Planes SU-31 3D into a glow plane.
    The donor was a wreak from one of my buddies at the field. He exploded the left wing on a bad landing attempt. The picture below are after I glued all of the splinters back together.

    Click image for larger version. 

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    Specs form the factory:
    Wingspan: 41 in [1040mm]
    Wing Area: 343 in2 [22.1dm2]
    Weight: 27.5 31 oz [780 880g]
    Wing Loading: 11.5 13 oz/ft2 [35 40g/dm2]
    Length: 38 in [965mm]

    Here is the current condition after quite a bit more restoration,(still with the electric power in this pic). I'm Still in the process of covering. Needs a little more detail.
    Click image for larger version. 

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    My goal for this build is to put a .30 4 stroke. I am hunting for one right now on RCU market. I already bought a magnum XL FS30AR but im still trying to track down an OS or Saito. These are not easy to find.

  2. #2

    Join Date
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    Nice work!

    From the size id say a 25-32 two cycle would be the best. A .30 four cycle may be a tad under powered and on the heavy side. All depends on the performance you expect when done.

    So far though, very nice work!
    Goldberg Tiger Club #17
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    Carl Goldberg Ultimate Brotherhood #56
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    http://radiocontrolhobbies.freeservers.com

  3. #3
    If it performs like this then I will be stoked.
    I think I just scored a Saito FA-30 on the market, Fingers Crossed!


  4. #4
    rgburrill's Avatar
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    I can't get my system to download the manual for this thing so you need to check this out for yourself. Small electric ARFs aren't known for handling the vibration levels of a fuel engine. especially a 4 stroke.

  5. #5
    Quote Originally Posted by rgburrill View Post
    Small electric ARFs aren't known for handling the vibration levels of a fuel engine. especially a 4 stroke.
    I know... that's what makes it interesting!

  6. #6
    Look what just arrived. Thanks to a great member here answering to my want ad.
    Click image for larger version. 

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    So now i need to figure out mounting.
    Click image for larger version. 

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    Mark all of the center lines and cut away half of the original mount.
    The piece that is left will act as a guide when i go to glue in the new mount,
    Click image for larger version. 

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  7. #7
    Making the new mount out of hobby ply.
    It will extend beyond the firewall and tie into the pine wood block that the landing gear is mounted to.
    Click image for larger version. 

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    Mounting the servo into the mount Why not...
    Made some more weight saving cuts as well.
    Click image for larger version. 

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    Ill get this mount glued in. Once that sets up I will cut the rest of the old motor mount out and then add new side pieces of plywood to brace against the firewall.
    The tabs that I built into the mount will lock in to that side brace.

  8. #8
    Decided to move the engine back 14mm (engine bolt spacing) to help balance the plane a bit.
    Pretty much about to wrap it up.

    Click image for larger version. 

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    Looking forward to a maiden this weekend!
    Last edited by badfrogg; 12-13-2016 at 08:00 PM.

  9. #9
    Finished!


    Nothing like breaking in an engine in the air!
    Last edited by badfrogg; 12-21-2016 at 07:55 PM.

  10. #10
    Time for another Great Planes electric ARF to Saito power!

    Scored this Super Stearman from a local guy. And I got another great deal on a Saito FA-30s form the RCU market.
    Click image for larger version. 

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  11. #11

    Join Date
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    Nice!

    Should do well with that Saito!
    Goldberg Tiger Club #17
    Citabria/Decathlon Brotherhood # 18
    Carl Goldberg Ultimate Brotherhood #56
    SIG Brotherhood #69
    Balsa USA Brotherhood #127
    Ultra Sport Brotherhood #135


    http://radiocontrolhobbies.freeservers.com


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