Open House. Here is an easy one.
http://i25.photobucket.com/albums/c6...ps472521fa.jpg

The headgear and clothing suggests very much Russian.

If it is Russian, then how about a Poliparkov?

However, I can't find a pic with that exhaust system.

The aircraft in the photograph is a Polikarpov, as you say. It is a U-2VS fitted with a trial silencer system.
You have control David.:ok:

Thank you Mel - sorry about the delay.

http://i636.photobucket.com/albums/u...ps411b867f.jpg

Interesting and intriguing engine. The engine appears to be slim with lower air intake which would indicate a turboprop but I do not think it is a PT6, possibly a Garrett AiResearch TPE331

Interceptor 400 ?

Correct engine Mel.

I'm not sure what Bri means by the Interceptor 400.

It is the Garrett AiResearch Turbo Comanche 400.

Therefore I feel it fair to award it 50/50 to both of you, but I think Brian is closest.

Thanks David, I agree Bri's choice of aircraft:-
Interceptor 400 Pirep
http://i25.photobucket.com/albums/c6...pscd212f8a.jpg

although not the actual aircraft was certainly far closer than guessing the engine type.

Okay then...here is the next challenge:
http://i141.photobucket.com/albums/r...ps299a6681.jpg

The engine is a Pratt & Witney XT57 installed in the nose of a C-124C Globemaster II.
http://i25.photobucket.com/albums/c6...ps53dae06c.jpg

Mel, you are spot on.:ok: Well done! Your turn.

Thanks Bri, a very good challenge. Here is the next:-

http://i25.photobucket.com/albums/c6...psda4b0c21.jpg

This aircraft is also French.

High wing single engine civil monoplane?

Karl. Not a High wing single engine civil monoplane it was a from a family of parasol monoplanes used for military purposes.

Morning Mel.

Dewoitine?

Not a Dewoitine, David.

Wibault 12 Sirocco ?

Not the Wibault 12 Sirocco Bri. However, a very similar aircraft except that this series of aircraft were not fighters but for recce purposes.