All quiet so time for a clue....early 1960's design. As far as I can see just the one built.

Morning Ken.

Not had much time lately - is yours based on a Grunau ?

Morning David:)
Not based on a Grunau, nor is it a German design. The glider it was based on was produced in considerable numbers - over 2,000 were built.

Based on the Antonov A1/A2 ?

Yes, in this case the A-2:ok:

G'day mate. Did Antonov do the conversion from glider to motor-glider?

Hi Graeme, hope all is well? No, this was not done by Antonov. It was another company, not Russian, but from a former USSR state.

Might that be Ukraine ?

Not Ukraine mate....further north.

Well, I've been through all 1960s manufacturers of Belarus, Lithuania, Latvia, and Estonia and drawn a blank.

Looks like it will have to be someone more clever than me to get this one.

In that case you've missed it - look again at Lithuania. We've had previous challenges from this manufacturer.

the RK-5, Ken???

On the right track Martin, but the RK-5 was an altogether more substantial looking machine. Different manufacturer but similar kind of numbering system:)

so, a Kalinkauskas machine?

A BRO design ?

No, note from Kalinkauskas, but the deisgners names does begin with K and end in S!

Not a BRO David. Incidentally I was expecting you to get this:)

I wonder why................did I post one from the same designer?

the BK-1, perhaps???? by Balys Karvelis

Do you mean the designer person or the company?

How's your head Martin? :ugh:

Not that Martin.

No, but you guessed one correctly from this designer not that long ago:ok: