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Jan 04, 2020, 03:19 PM
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Build Log

Yak-54 800mm Flatplane Scratchbuild

Hello all,

I usually hang out in the hand launch and high performance glider forums, but I recently stepped up my aerobatic flying again, and to that end I just finished scratchbuilding a simple 3d training plane. It is too heavy to fly indoors but just the right thing for outdoor training sessions.

Also, it was super easy to build, took maybe 25 evening sessions spread over 4 months. The plans I drew in the summer holidays in August 2019, maiden flight was today 4 Jan 2020.

Following posts will show some pictures of the design and build process.
No flight vid yet as I'm embarrassed by my lack of 3d flying skills

Span: 808mm
Total area: 0.205m2
All up weight: 490g
Leomotion LEO2208-1025 with APC 9x6
3s 850mAh
Airfoil: S8035 (14%) with added flat ailerons

Any question welcome;-)

Blue skies, Andy
Last edited by Dotcom; Jan 04, 2020 at 03:40 PM.
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Jan 04, 2020, 03:31 PM
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Wing construction

Span is 808mm as each wing is 400mm and the fuselage is 8mm thick.
Airfoil I chose a symmetric S8035 which has 14%. This airfoil creates the fixed part of the wing at a constant chord of 150mm. Added to the trailing edge is the aileron of 6mm flat section, for a total chord at the root of 225mm and 200mm at the tip.

The wing is classic open rib design with sheeted D-box and root. I-beam spar with 5x3mm pine caps. Ailerons are 6mm balsa truss structure.
Jan 04, 2020, 03:57 PM
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The fuselage took a bit more head scratching. Light, stiff, flat, and house all RX equipment and landing gear.

In the front it houses a ply box which contains all drive components. The center section has a ply sandwich for the servos and landing gear struts. The rest is balsa truss. The canopy bow is laminated from 2mm balsa which are wet, bent to shape and then glued. It looks like the Yak I'd say.
Jan 04, 2020, 04:26 PM
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Final Assembly

Final Assembly
Unfortunately there are no pictures from during the covering, but then it was really straightforward. Transparent red Oracover all over, add some white identification markings.

Landing gear is 2mm steel bent to shape, 40mm foam wheels.

Leomotion LEO2208-1025, APC 9x6, Castle Talon 25A, 3s850mAh
Graupner GR-16, 4x Hitec HS5055MG

Pushrods are 3mm carbon tubes, the only carbon in this plane.

All up weight: 490g

I use two flight phases Speed and Acro with different rates, speed suiting classic pattern aerobatics and acro with 45deg on all surfaces for 3d.

She flies great and offers a lot of potential to improve my aerobatic flying. Plus, she is small and can always fit into the car.
Overall, I'm quite happy how this turned out.

Some more detail pictures of the installed components and inflight footage to follow.

Blue skies, Andy
Jan 06, 2020, 10:38 AM
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Looks fantastic. There was a kit available years back that looked similar but is now gone... I may have to "borrow" your plans
Jan 06, 2020, 03:38 PM
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The plans currently are just hand drawn 'alignment aids'.

I can refine them a bit to be more self-explaining and check if a local copy shop can make a scan so as to make a pdf available. A fellow here was also interested to make one.

Blue skies,
Jan 12, 2020, 07:39 AM
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Amazing work, Andy!
Jan 12, 2020, 09:27 AM
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Thanks Benz11!

Yesterday I got 3 more flights in. I really like how she can do crazy manoevers when using the large rates, much better than her pilot. She offers a lot of potential to improve my aerobatics.

Below some more detail pictures.

Blue skies, Andy

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