Sportavia-Pützer Leiseflieger

[Matej]

During some search, i found very interesting information (post no.98):

Project “Leiseflieger” = Silent Flyer was started in 1970 and resulted in the maybe the first stealthy aircraft in 1975 regarding RAM. Project MRMF " Firefly” from MBB was started in 1981 (a stealth fighter - 2 prototypes build)-The RCS was tested on a full-scale - and a windtunnel modell- and stopped in 1988 due to the above mentioned concerns regarding “impossible to be calculated” risks for financing maintenance costs - surface skin controlls -and life service upgrade costs, and future radar developments Low-frequency radars-2GHz-UHF and L-band frequency, and in the IRST technology.

MBB also developed a software package for RCS calculation, similar to Lockheed's 'Echo' RCS-calculation program. The RaSigma4 is the continuation in practical verification of RCS. It’s RCS was supposedly lower than that of the F-117 in 1991.

http://www.ww2aircraft.net/forum/modern/b-2-crash-12050-7.html

Is this true?? Or better to say, does anybody have any information about the “Leiseflieger”? Project, aircraft, results, anyting... If it be verified, it can completely change the history of the european stealth effort.

 

[overscan (PaulMM)]

Sportavia-Pützer Leiseflieger

It appears to have been a modified Sportavia-Pützer light aircraft/motor glider, derived from a Fournier design. Not sure which model. These are noted for relatively low RCS due to construction methods. It may have featured additional RAM treatments. Overall, nothing that significant.

 

[Matej]

Sportavia-Pützer Leiseflieger

I see. I must admit, that I had much higher expectations. Thanx for the info anyway.

 

[Jemiba]

Sportavia-Pützer Leiseflieger

Although names of projects maybe intentionally misleading, of course,
the name "Leiseflieger" implies, that it was a similar development as the
Lockheed Q-Star or YO-3A, so stealth, in the sense of invisibility to radar
may have no design goal at all.

 

[Matej]

It is possible to produce a mini-RPV capable of flying high
or at night to avoid visual detection and slowly enough
to defeat radar moving-target indication systems, having
an infra-red signature too weak to attract Redeye/SA-7,
and costing less than a Roland-type SAM; the last feature
would make it uneconomic to shoot down the RPV in this
way. The Sportavia Leiseflieger (silent aircraft), a modification
of the RF-5, provided useful background information
for these studies. The Leiseflieger produced less than
50dBA during overflights and its IR signature was reduced
to below Redeye-attracting level; its radar signature remained
significant, however.

http://www.flightglobal.com/pdfarchive/view/1976/1976%20-%200763.html

Now it would be nice to find some visual material.

 

[hesham]

Re: Sportavia-Pützer Leiseflieger (early stealth aircraft)

By the way,


the Sportavia modification to RF-5 for this job was called S.5,a little known info that the
company went further and developed the S.5K and C.2,but it seemed to be not successful.

 

[hesham]

Re: Sportavia-Pützer Leiseflieger (early stealth aircraft)

By the way,


the Sportavia modification to RF-5 for this job was called S.5,a little known info that,the
company went further and developed the S.5K and C.2,but it seemed to be not successful.

The source for this info is the Airlife's General Aviation book,and they also mention that;
the company used many prototype beside S.5K and C.2 as a stealth aircraft,but they
didn't recognize them.