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Aircombat Yak-9

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Timo Starkloff04/05/2020 21:09:14
398 forum posts
885 photos

Hello everyone!

The Yak-9 plan in the May 2020 issue is my first published plan in the RCM&E magazine and I'm very happy about that. In case there are any questions I would be glad to help.

I have many good memories of that tough little plane and some exciting dogfights at aircombat contests. Actually several new ones are being built at a club nearby and powered again by small .15 engines for the new retro trend.

Best wishes and stay healthy,


Edited By Timo Starkloff on 04/05/2020 21:09:40

Edited By Timo Starkloff on 04/05/2020 21:10:00

john stones 104/05/2020 22:48:01
11546 forum posts
1517 photos

Congratulations Timo, you're famous. star

James Mark26/05/2020 23:35:37
54 forum posts
13 photos

Hello Timo, I am building your Yak-9 and I have a spare OS LA .25 looking for a home. I was enquiring if the OS LA .25 engine is too large for the design.

The .25 is around 60 grams heavier. Your thoughts would be appreciated

Cheers James.

Timo Starkloff27/05/2020 21:10:28
398 forum posts
885 photos

Hello James, that should work, too. There's at least one Yak with a .26 four-stroke:

The .25 LA should be quiet similiar in weight and power. The plane above was at 909 grams, dry. Lighter is better of course and for these small models even 100 grams less flies much nicer. But the models can cope with a higher wing load. Flying will be fine, landing speed a bit higher. It's the start which is more critical at higher weight. Engine failure during start is much more forgiving at lower weight.

Problem is the long nose and short tail of the Yak. Therefore would install the elevator servo in the tail, as done on my Bf 109 and put the receiver battery as far back as possible:

To keep general weight low despite the heavier motor, try to get sorted light balsa, use small 10-13 gram servos and use white glue or cyano, no epoxy. Finish should be light, so no glass cloth covering.

Otherwise I would suggest a 1/12 Hawker Typhoon, Tempest or Gnumpf pylon racer as a perfect model for .25 engines:

Best regards,


Edited By Timo Starkloff on 27/05/2020 21:11:06

James Mark01/06/2020 22:31:17
54 forum posts
13 photos

Hello Timo. Thanks for your reply. I have already cut out all the parts so the Yak will be built! I may buy a new .15 OS LA and keep the .25 for another project.

Another member of our local flying club has already built one and we are going to try and persuade others to build and join the fun👍

Will keep you posted on progress.

Cheers James.

Timo Starkloff07/06/2020 22:04:41
398 forum posts
885 photos

Thanks, nice to hear that, James! Flying with these small fighters is always much more fun with at least one another pilot. Looks better and adrenaline goes up. These easy models are not only perfect for dogfights but also for formation flights.

Here's a link to the international Facebook group of aircombat pilots:

I'm always interested on progress of self built models


Edited By Timo Starkloff on 07/06/2020 22:09:07

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