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Turbine helicopter projects from Poland

hesham

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Hi,

the Swidnik SM-6 :light helicopter project based on SM-4 Latka,fitted
with one GTD-350 turboshaft engine,has anyone a drawing to it.
 

boxkite

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A question to the forum members from Poland (and all others too, of course):

Can anybody help with three-view drawings or artist's impressions of PZL-Świdnik's turbine helicopter projects

* SM-4T
* SM-5 Jaszczurka
* SM-7 Sójka

All three designs are mentioned in "Historia Zakładów PZL-Świdnik S.A." (ISBN 83-86776-57-5), but unfortunately without any illustration ...
 

Petrus

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As for the SM-4T, which was to be a turbine engined (with a downrated GTD-350 Soviet engine) derivative of the SM-4 Łątka, I'm afraid that to find any pictures of the design would be very difficult if not impossible. The SM-4 (with piston WN-6 engine) was actually built, so some of its photos do exist (I have a few, but of very poor quality, below you've got a drawing of the SM-4), but the SM-4T was merely a study, not a full-scale design, very soon cancelled in favour of other projects.

The designations SM-5, SM-6 and SM-7 were used several times, or rather to designate various versions of the helicopter projects. What I have on Jaszczurka is a photo of its mock-up that you'll find attached here. Jaszczurka could be designated the SM-5 but also it was referred to as Mi-2.1.1. In the years 1968-1972 there were 18 versions of single-engine helicopter projects designed at Świdnik, under the misleading "Mi-2.1" designation, which was to convince the Soviets that Świdnik worked on a Mi-2 single-engine derivative, and not indigenous projects. The mock-up of Jaszczurka was built sometime between 1970 and 1972.

And finaly the SM-7, a two-seater designed around 1977 (a drawing attached).

I hope it would somehow help.

Best regards,
Piotr
 

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Petrus

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I've just found some info on the Jaszczurka project, which comes from "Skrzydlata Polska" issue 5/2007.

Below you'll find some photos of Jaszczurka's mock-up, which was built probably sometime in the beginning of the 1970s (a brochure with the photos and other info on the project was dated of 1972) as well as 3V drawings.

Specifications were to be as follow:
Length 9.40 m
Length with turning rotors 12.94 m
Height 2.88 m
Main rotor diameter 10.8 m
No. of rotor blades 4
Tail rotor diameter 2.6 m
No. of rotor blades 2

Empty weight 1150 kg
All-Up Weight 2000 kg

Max. Speed 270 kph
Ceiling 8000 m
Range above 400 km

Engine TWD-850 1 x 625 shp

Accomodation:
1 pilot + 3 or 4 passengers
or
1 pilot + 2 wounded on stretchers + 1 medical attendant

or 1 pilot + 600 kg of cargo

According to documents on the project, which survived, the TWD-850 engines were considered at that time as a powerplant of a contemplated twin-engined helicopter. Probably it could have been a first vision of what then became the W-3 Sokół. The TWD-850 were of Soviet origin, they were to be used in An-14, Be-30 and An-28, but then were replaced by the TWD-10, whose helicopter version developed in Poland as the PZL-10W eventually was mounted in the W-3 Sokół.

Best regards,
Piotr
 

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hesham

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hesham

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Hi,


the early PZL S-4,which later called SW-4.


http://www.flightglobal.com/pdfarchive/view/1989/1989%20-%201365.html
 

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hesham

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Hi,

the SM-5 was first allocated to a develop of SM-4 Latka,but with GTD-350
jet engine,remained a project only.

http://www.samolotypolskie.pl/samoloty/2709/126/SM-4-SM-5-latka
 

hesham

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Petrus said:
And now a drawing of Jaszczurka with optional floats as well as machine-guns.
The anther drawings;

http://www.smil.org.pl/ptl/wyklady/47_Niezrealizowane_koncepcje_Mielca.pdf
 

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Petrus

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In my post https://www.secretprojects.co.uk/forum/index.php/topic,11014.msg147816.html#msg147816 you may now find photos of the Jaszczurka mock-up in better quality.

Piotr
 
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