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

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Old 11-30-2016, 04:17 PM
  #1
badfrogg
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Default 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.

[ATTACH=CONFIG]2191838[/ATTACH]
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.
[ATTACH=CONFIG]2191840[/ATTACH]

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.
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Old 11-30-2016, 06:24 PM
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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!
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Old 11-30-2016, 07:05 PM
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If it performs like this then I will be stoked.
I think I just scored a Saito FA-30 on the market, Fingers Crossed!

https://www.youtube.com/watch?v=pcVsQklNlCY
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Old 12-01-2016, 06:34 AM
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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.
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Old 12-01-2016, 06:56 AM
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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!
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Old 12-06-2016, 08:35 PM
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Look what just arrived. Thanks to a great member here answering to my want ad.
[ATTACH=CONFIG]2192499[/ATTACH]

So now i need to figure out mounting.
[ATTACH=CONFIG]2192500[/ATTACH]
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,
[ATTACH=CONFIG]2192501[/ATTACH]
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Old 12-06-2016, 08:49 PM
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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.
[ATTACH=CONFIG]2192502[/ATTACH][ATTACH=CONFIG]2192503[/ATTACH][ATTACH=CONFIG]2192504[/ATTACH][ATTACH=CONFIG]2192505[/ATTACH]

Mounting the servo into the mount Why not...
Made some more weight saving cuts as well.
[ATTACH=CONFIG]2192506[/ATTACH]

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.
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Old 12-13-2016, 07:54 PM
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Decided to move the engine back 14mm (engine bolt spacing) to help balance the plane a bit.
Pretty much about to wrap it up.

[ATTACH=CONFIG]2193387[/ATTACH][ATTACH=CONFIG]2193388[/ATTACH][ATTACH=CONFIG]2193389[/ATTACH]

Looking forward to a maiden this weekend!
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Last edited by badfrogg; 12-13-2016 at 08:00 PM.
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Old 12-21-2016, 07:37 PM
  #9
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Finished!
https://www.youtube.com/watch?v=JBjNB6EjS0Q&t=133s Nothing like breaking in an engine in the air!

Last edited by badfrogg; 12-21-2016 at 07:55 PM.
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Old 01-19-2017, 09:58 PM
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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.
[ATTACH=CONFIG]2197387[/ATTACH]
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Old 01-20-2017, 05:55 AM
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Nice!

Should do well with that Saito!
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