Large Model Association Forum

Another project I'm working on is the 1/3 scale Yak52. Basically a blown up version of the popular Willis Warbirds 1/4 scale kit.
Engine will be 3w150cc and estimated weight around 22kg.
Chris is himself building a1/3 scale Yak 50.
Bonzey

Dear Ken
The Yak is looking very nice mate, what did it take you about three days to make?
I must admit I do feel part of the Yak project . I can remember Chris having the idea to make
a Yak after having a look around one of the Aerostars aircraft on the Saturday before the Tibenham airshow.

After that it was like he had designed and built it in about three weeks, I am sure it was longer than that but that is what it seemed like.

Those 1/4 scale models seem to fly well, you would think the 1/3rd scale ones will be even better.

Keep up the good work, hopefully will see you soon.

Regards Phil G.

Hi Phil. I'm good thanks as I hope you are my friend .
Yes, it's all your fault!
The 1/4 scale yak is one of my favourite models to fly, so I am also hopeful that the 1/3 scale one will be better still.
Ken.

And that's the way the cookie crumbles

What are your plans regarding the retracts?
I assume that the basic construction is similar to the 50, just adding the extra cockpit, retracts and the flaps?

One more question.
I´m building a 1:3 scale 50 myself, and this is set up with the original Clark YH airfoil, set at +2° incidence. The engine and tailplane set at 0°.
What are the angles on your Yak?

Ken Bones wrote:Another project I'm working on is the 1/3 scale Yak52.

Do you have a colour scheme in mind? If not, then can I suggest Betsy.

This is the Yak 52 that usually visits the show at Elvington. Mrs Hairy Dave has a particularly soft spot for this aircraft.

The 52 UC is yet to be sorted, but I know what's needed in my mind and should be easy enough.
Incidence angles are the same as per the 1/4 scale version of the Willis Warbirds kit. The designer will have to comment on that as I have no idea what they are.
I will put up a piccy of the scheme I'm thinking of later. Only thing is, I keep changing my mind.
Bonzey

Ken I like the color scheme on that pic. Hi Tinus how are you doing, have you run the radial up yet ? on the retract side I have done the 1/3 set for the Yak 50 but I have no pics, they are the same as the 1/4 one shown just larger. Are the 52's just 50's in reverse ??, plus a nose leg. These builds are great, they will have real presence in the air.
Dave

Hi Dave, the mains on the 52 just need to have a reversed action because the main spar is in the way for piston.
Ken

Yes 2 degrees positive on wing, 1degree down thrust, zero tail

Love the colour scheme, looks similar to the one Ali has just been flying?

Dave.

Thanks for the reply. Seems I´m on track for a sweet flying 50. :-)

The Moki 250 has been run on the test stand, using the proposed engine dome, and it runs perfectly it seems.
Much like a full size engine it runs quite lumpy at low idle when cold, but after 20-30 seconds it smooths out and ticks away at a lovely rumbling idle. It´s extremely easy to start also.

I have attached a few drawings of the retracts on the 52. Maybe they are useful to you.