Alas, the Westland Wyvern S4 is not our mystery machine, my dear Mr Egorka. But please – take your time. Your academic obligations do have the absolute priority! 
Ki-64?
Alas - no, my dear Mr. SS Ouche-Vittes! 
is it british?
Unfortunately, my dear Mr. SS Ouche-Vittes, our mystery machine is of French origin.
Hello, y’all!
It’s a French Latecoere 299, the land-based version of the Latecoere 298 seaplane torpedo bomber, dating from 1939. See http://www.aviastar.org/air/france/latecoere_l-299.php
p.s. Thanx for the hint, Librarian! I thought that it looked kinda familiar, but couldn’t place it.
Russ
FAA Airman Pending
Proud son of Rose and Wes
oh darn…
Congratulations, my dear Mr. Malarz Russ – yes, the Latecoere Late 299 realy was our mystery machine. You have your well-deserved turn. Please, carry on!
Hello, y’all!
Why thank you, Librarian! Here is my offering:
Enjoy!
Russ
FAA Airman Pending
Proud son of Rose and Wes
That is the Finnish Myrsky.
does it use a DB engine?
Hello, y’all!
Darn! It took Kiwimac from deepest darkest NZ all of 42 minutes to figure that one out! See: http://www.nbl.fi/~nbl2673/ma00.html
Okay, Kiwimac… come up with a good one!
Russ
FAA Airman Pending
Proud son of Rose and Wes
Actually it was the DB engine which gave it away for me.
Ok, let’s try one.
Oh, what a nice surprise, my dear Mr. Kiwimac: SAI Ambrosini SS2 (SAI Stefanutti Mod. 2)! You really do have a taste for unusual, but highly effective aerodynamic solutions. Thank you very much for this photo-rarity!
Its a test bed for the J7W1 Shinden、the Kugisho MXY-6.
Ah Librarian, you are right!
I also have pictures of the SS.3 and SS.4, fascinating aircraft. I do believe it is over to you sir!
Thank you, my dear Mr. Kiwimac. And yes, I completely do agree with you – those previously mentioned pictures are exceptionally rare, especially those connected with the SAI Ambrosini SS.3 Anitra. Threfore, please: if you do have some spare time, and if you are willing to lend a hand to those numerous supporters of aircraft elation, post those pictures in our thread connected with the Regia Aeronautica. I am assuring you, my dear Mr. Kiwimac, that your benevolent assistance will be highly appreciated!
And now – back to our main theme in this thread! Here is my up-to-the-minute offer:
Yes, I know: it looks like a pretty ordinary trainer. However, this almost completely forgotten airplane was rightly considered amongst the best machines in the world!
Could it be a WACO UPF-7?
Definitely not, my dear Mr. Sergej! After all – just observe that bubbled engine cowling… 
Well, some of this are flying with out engine-and-wheel covers, but now I see it’s much bigger and the wheel mounts are stronger. Here some intermediate result:
The engine could be an Bristol Jupiter or some deveriats and they’re many
simularities with this one:http://1000aircraftphotos.com/Contributions/BradicSrecko/4649L.jpg
But it’s clearly not a biplane.
