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PRC Tu-4 w/ WJ-6(?) AI-20 turbo props performance Q

frank

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I've been reading in various sources recently about the PRC Tu-4s modded with the turboprops. We all, I guess, know about the drone carrier & AWACS & I've read some indication that the conversion goes back to the '70s for the standard bomber version, I guess the drone carrier being closest to that. However, I've not found any performance data & I'm curious as to that. I don't know how the weights of the piston engines compare to these turboprops, but they are about twice the power of the recips & appear a cleaner (less drag) installation combined with the additional exhaust thrust, surely the a/c would have been a screamer, not to mention climbing like a bat out of Hades along with greatly reduced ground roll & probably no payload weight limit. Anyone ever seen or heard what its performance was? Or, any of you engineering types have a thought? My limited knowledge & guesstimate of turboprop mods in general it oughta be able to hit about 500 MPH, but I also don't know the airframe limitations, in addition to climbing like that aforementioned bat & other guesstimates. Thanks.
 

Apophenia

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Frank,

I suspect that you're right about a 500 mph top speed. After all, the corpulent An-12 Cub can hit 482 mph (777 km/h) on similar engines.

The original Tu-4 is a much heavier aircraft [Tu-4 empty weight: 77,594 lb / 35,270 kg vs An-12 62,000 lb / 28,000 kg]. But considerable weight loss must have been accomplished just by removing the gun turrets, bomb racks, etc.

You asked about comparative engine weights. Empty weight of the original ASh-73TK radial was 2,987 lbs / 1,355 kg. Empty weight for a AI-20M turboprop (or Zhuzhou Wojiang-6 equivalent *) is 2,376 lbs / 1,080 kg.

So, reckon on a further 2,444 lbs / 1,110 kg in engine weight saved. That's 4 x 611 lbs / 277 kg difference between the empty weights of ASh-73TK and AI-20/WJ6.

[* The Kong Jiang-1 AEWC may well have Zhuzhou Wojiang-6s with BPF props. But, I think we can assume that earlier Tu-4 conversions had AI-20Ks or AI-20Ms with Stupino props. In any case, the dry weight for the WJ6 should be identical to an AI-20.]
 

borovik

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1)-2) - Tu-4 (AI-20M)
3) – “Aircraft – 94” Tu-4 (TV-2)
4) – “Aircraft – 94” Tu-4 (TV-4)
Sources: “AviO’4”
“Aviation Cosmonautics #17
V.Rigmand "Strategic twins"
 

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Apophenia

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Nice! Thank you, Borovik.

Do you have any information on the 1951 flight testing of TV-2s on the Tu-4? Was the TV-4 another Isotov design?
 

borovik

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"Do you have any information on the 1951 flight testing of TV-2s on the Tu-4?"
The TV-2 at that time had, as per its trials:
5163 shp (taking off mode)
3740 shp (cruise mode)
dry weight (whole assembly) 1700 kg
The Tu-4 performance with TV-2 could be improved at 15-20% only, which
wasn't enough, so they stopped further works.
"Was the TV-4 another Isotov design?"
TV-4 (original designation of VK-2) Single-shaft axial turboprop developed at GAZ-117 under Klimov 47 to termination 1952; 8-stage, 3,357/3,580 kW at 9,000 rpm
Sergei P. Izotov (1917-1983) - chief designer of air-engines.
A disciple and first substitute V.Ya.Klimov’s……With 1962 more than 20
years stayed at the head of "V.Ya. Klimov" factory .
As per my opinion, it is about the same engine. :-\
 

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Apophenia

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Excellent, many thanks Borovik!

borovik said:
"Do you have any information on the 1951 flight testing of TV-2s on the Tu-4?"
The TV-2 at that time had, as per its trials:
5163 shp (taking off mode)
3740 shp (cruise mode)
dry weight (whole assembly) 1700 kg
The Tu-4 performance with TV-2 could be improved at 15-20% only, which
wasn't enough, so they stopped further works.

And, I think, there is the answer to Frank's original question. :)
 

famvburg

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I just read in a Tu-4 book that the Tu-4 that was tested with the TV-2 engines had contra-props. I haven’t seen any pics, but if it had contra-props, wouldn’t they be shown in drawings, as they are on the TV-4 powered one? I found drawings of the Jumo 022 showing contra-props, but that’s it. Also, any idea where the exhausts came out on the TV-2 version?
 

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