Yakovlev Yak-7R 1942 project (2xramjets, 1x rocket engine)

[AF]

Hello, i have question about Yakovlev Yak-7R project. OK, i know that Yak-7R was (probably) unofficial designation of recon version of Yak-7, but in some books i found information about project from august 1942 which was powered by one D-1A liquid fuel rocket engine (designed by Leonid S. Dooskhin) mounted in rear fouselage ande two under-wing mounted DM-4S ramjet engines. Cockpit was moved forward, piston engine was removed.

I want build scratchbuild model so i need some drawings. In book „Encyklopedie sovětských jednomotorových stíhacích letadel 1939 – 1951“ i found side draw (see image 1), but it does not fit to Yak-7 draw. On my hard-disc i have another side draw (see image 2) which i downloaded years ago from now inactive slovakian website. I think that second image is more accurate but i am not sure. Only other info about Yak-7R which i found was this web page:
http://tanks45.tripod.com/Jets45/Histories/Jak-7R/Jak-7R.htm

So my question – does anybody have more information about this project and does anybody have some drawings (3 view etc.) ???

 

[Apophenia]

Interersting project AF ... both the Yak-7R and your modelling project.

Your 2.jpg may well be more accurate overall but, just going by photos of the Yak-7PVRD testbed, the shape of Merkulov DM-4 ramjet cowling doesn't look right. http://tanks45.tripod.com/Jets45/Histories/Yak-7/Yak7PVRD_2.jpg

 

[hesham]

Brilliant,thank you AF.

 

[redstar72]

1.jpg picture is correct. 2.jpg isn't correct, and looks to be purely speculative. Yak-7R project actually didn't look much like Yak-7; but in spite of this, the basic fuselage girder was the same.

I attach here the Yak-7R layout drawing from the book "Yak fighters of the Great Patriotic War period" by Alexei T. Stepanets, and its comparison with the basic Yak-7 made by myself. By the way, Yak-7R was 1.325 m longer.

 

[borovik]

Six sources known to me shows the same side view of the project. (Nearly ten years ago, I made a simplified scheme, 3 v-ws, based on the data)

 

[AF]

Thank you very much - comparasion and 3 view are very helpful (and interesting) for me

 

[hesham]

From this book.