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Mar 20, 2019, 05:52 AM
No RTF flies like your own SB
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Build Log

SU-37 (Shumate) - Prop in slot conversion


Hi there,

Sharing my latest project: a prop-in-slot conversion of the great SU-37 Flanker by Steve Shumate.
For details (plans, construction guides, etc), please refer to the original thread: https://www.rcgroups.com/forums/show...anker-Park-Jet

I will use this build log to document my conversion only, and hopefully arrive to a great flying jet

Here are the specs:
- Wingspan 760mm (as per original plans 100% size)
- AUW: estimated in about 1kg
- Motor: Turnigy Propdrive 3530 1400kv
- Propeller: 8x4.5-8x6
- Battery: 4S 2200mAh

Material: styrofoam boards cut at 12mm thick.

I'm also planning to put my 3D printer to good use and printout a few nice and scale details.

The power train should pull between 1.9-2.4kg and make the jet fly at about 150km/h (according to ecalc), which should make it for a nice fast and furious little jet. I also expect it to be quite noisy with the prop-in-slot mod.

Wish me luck!

Here are some photos to start with...
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Mar 24, 2019, 07:20 AM
No RTF flies like your own SB
mperaltaoz's Avatar
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This is how I reinforced the nacelles for the prop-in-slot configuration.
Also reinforced the nose with carbon fibre.
Last edited by mperaltaoz; Apr 19, 2019 at 11:41 PM.
Mar 24, 2019, 07:24 AM
No RTF flies like your own SB
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And here is how the nose looks like after gluing and sanding
Mar 25, 2019, 04:49 AM
No RTF flies like your own SB
mperaltaoz's Avatar
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Here's how she looks with all the parts sanded and presented in place.
Looking good!
Mar 25, 2019, 04:52 AM
No RTF flies like your own SB
mperaltaoz's Avatar
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Testing all the parts and electronics in place.
I did this to make sure she will balance ok with the battery in the back/mid nose.
In any case, I will leave cutting the prop slot as the last thing after painting and scale details so I can place the motor in the right position for balance.
Apr 01, 2019, 04:35 PM
No RTF flies like your own SB
mperaltaoz's Avatar
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Paint job is done. Next step will be panel lines and decals.
Apr 07, 2019, 06:05 PM
No RTF flies like your own SB
mperaltaoz's Avatar
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Panel lines and decals complete.
Time for electronics and remaining plastic parts.
Apr 07, 2019, 09:33 PM
PSALM 14:1
Sammy70's Avatar
Wow, it looks way too nice to cut a big slot in it!

Beautiful work!!
Apr 08, 2019, 08:59 AM
No RTF flies like your own SB
mperaltaoz's Avatar
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... and here is how she looks like now.
OMG, the noise she makes!!!
Apr 08, 2019, 12:53 PM
PSALM 14:1
Sammy70's Avatar
Your slot is too narrow -- it needs to be extended towards the nose of the plane to help reduce the noise.

https://www.rcgroups.com/forums/show...sign-and-Tests
Apr 08, 2019, 05:27 PM
No RTF flies like your own SB
mperaltaoz's Avatar
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Thanks for the link. Will definitely look into it.
I did some tests yesterday and I had to put my ear plugs in as the noise inside my garage was unbearable...
(it's my first prop-in-slot plane as you can probably tell)
Apr 08, 2019, 07:34 PM
PSALM 14:1
Sammy70's Avatar
Prop in slot designs are typically VERY noisy.

Personally, I think you would have been better off to leave the motor(s) at the rear of the plane -aka- pusher instead of prop-in-slot.
Apr 08, 2019, 07:48 PM
No RTF flies like your own SB
mperaltaoz's Avatar
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I tend to agree with you, Sammy.

This is my first prop jet (all the others I built were EDF) and I thought the prop at the rear would be more of a pain for take offs and landings.
I'll go with this plan for now:
- Follow the guidelines in the link to see if that makes the noise more bearable
- If not, I'll move the motor to the rear and re-glue the cut out parts in the slot (I think I saved them just in case)

I definitely want to keep this one as a prop jet as I'm sick of EDFs with their low thrust and high battery consumption. I wanted this jet to be a rocket and based on the bench tests she will be! (the powertrain delivered nearly 800W on the bench)
Apr 08, 2019, 08:34 PM
PSALM 14:1
Sammy70's Avatar
Good plan.

Good luck!
Apr 10, 2019, 08:56 AM
No RTF flies like your own SB
mperaltaoz's Avatar
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I went through the thread and cut a bowtie slot on my SU-37.
The result was.... disappointing
The new slot looks uglier (much bigger) and the noise is just the same but with a higher pitch.
I'll maiden her like this but I reckon I'll just glue the parts back and keep the smaller slot...


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