Polikarpov I-17 and I-18 fighter projects

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Further development of the I-17Z
 

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Some plans of the Polikarpov I-17 from Aviatsiya N°12:
 

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Polikarpov's sketch of I-17-derived racer / speed record aircraft (Published by V.P. Ivanov in his book "N.N. Polikarpov's Aircraft"):
 

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The I-18 (TsKB-25 HS.12Ycrs) high-speed interceptor fighter project from the mid-1935. Its differences from the I-17 were smaller wing (8.3 m span, 13.45 m2 area) and evaporative cooling system. Estimated takeoff weight was 1800 kg, maximum speed 507 km/h at 3380 m altitude. In December 1935 it was redesigned into TsKB-33 with larger wing (back again) and two retractable radiators, but none of them wasn't completed.

(From Krylia Rodiny No.11/1993).
 

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Topic split. Here is a photo of the I-17 in model form:
 

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More I-17/TsKB-19 art from the Russian Modelist Konstruktor:
 

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Haven't noticed still yet, that the version on the very first post of this thread has a dorsal hook.
Was it intended to be used on Zveno ?
 
Jemiba said:
Was it intended to be used on Zveno ?
Click to expand...

Yes, it was! A special version for this special purpose. Therefore it had not only dorsal hook, but also short wings (only 9.13 m2 wing area, 6.7 m span) and NO conventional landing gear!

The project was dated May 1936; maximum speed was estimated 530 km/h with standard 860-hp M-100 (at 3000 m altitude) and 562...575 km/h with more powerful 1000-hp version. Empty weight would be 1227 kg, flight weight 1716 kg. (From: Ivanov V.P. Aircraft by N.N. Polikarpov. - Moscow, Rusavia, 2004 (ISBN 5-900078-25-6). - Page 275).
 
Thank you !
Still to be used with the TB-3, I think.
 
Indeed, thanks Justo. But AFAIK, hooking on to the TB-3 was never tried aand actually it
already was a little bit outdated in the late '30s, I think.
 
Hi,

here is some drawings to Polikarpov I-17.

Крылья 2/2008
 

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There were three Polikarpov I-17 fighter.
No.1 prototype : Manually retractable radiator
No.2 prototype : Manually retractable radiator
No.3 prototype : Evaporative cooling system. You can see retractable radiator in the 4th drawing.

https://www.sas1946.com/main/index.php?topic=16399.0

http://www.airwar.ru/enc/fww2/i17.html
http://translate.google.fr/translate?hl=fr&sl=ru&tl=en&u=http%3A%2F%2Fwww.airwar.ru%2Fenc%2Ffww2%2Fi17.html&sandbox=1
http://wood.co.jp/wooden_airplane/wooden_airplane-62.html

Perhaps this is a No.3 prototype.
http://www.secretprojects.co.uk/forum/index.php?action=dlattach;topic=17878.0;attach=185989;image
 

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