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The 1996 ILA airshow was at Berlin Schönefeld airport rather than at Berlin Templehof.
 
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{{Short description|German single-seat glider, 1975}}
<!-- This article is a part of [[Wikipedia:WikiProject Aircraft]]. Please see [[Wikipedia:WikiProject Aircraft/page content]] for recommended layout. -->
<!-- This article is a part of [[Wikipedia:WikiProject Aircraft]]. Please see [[Wikipedia:WikiProject Aircraft/page content]] for recommended layout. -->
{|{{Infobox Aircraft Begin
{|{{Infobox Aircraft Begin
| name='''Akaflieg Stuttgart FS-29'''
| name=Akaflieg Stuttgart fs29
| image=File:Akaflieg Stuttgart fs-29 Glider D-2929 Varied Wingspan BeloRWing DMFO 10June2013 (14400269988).jpg
| image=
| caption=The fs29 on display at the [[Deutsches Museum Flugwerft Schleißheim]]
| caption=
}}{{Infobox Aircraft Type
}}{{Infobox Aircraft Type
| type= [[Research Glider]]
| type= [[Glider (aircraft)|Glider]]
| national origin=[[Germany]]
| national origin=[[West Germany]]
| manufacturer= [[Akaflieg Stuttgart]]
| manufacturer= [[Akaflieg Stuttgart]]
| designer=
| designer=
| first flight= 15th of June {{avyear|1975}}
| first flight= 15th of June 1975
| introduced=
| introduced=
| retired=
| retired=
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}}
}}
|}
|}

The '''Akaflieg Stuttgart FS-29 TF''' is a glider designed and built in [[Germany]] from {{avyear|1972}}.
The '''Akaflieg Stuttgart fs29 TF ''Stadt Stuttgart''''' is a glider designed and built in [[Germany]] from 1972.

== Development ==
== Development ==
The fs29 was designed and built to research the telescopic variable span wing.
In the quest to achieve both good soaring/slow speed and good cruising/high-speed characteristics many glider designers have studied variable geometry or polymorphic concepts. Unlike fast jet aircraft, variable wing sweep has very limited value for a slow flying glider, so glider designers favour concepts which involve changing the wing area rather than sweep angle. There are several methods of achieving variable area, including:- area increasing flaps extending from leading or trailing edges of the wing, telescopic variable span wings where an outer glove is extended or retracted over an inner section, and extending gloves which extend out from the fuselage over the existing wing. The FS-29 was designed and built to research the telescopic variable span wing.
With the wing at full extension the FS-29 could thermal successfully in very weak conditions and land safely in small spaces, conversely with the wing fully retracted the FS-29 could cruise between lift at higher speeds, improving performance in distance/speed competitions, as well as perform aerobatics to higher load factors with faster control response.
With the wing at full extension the fs29 could thermal successfully in very weak conditions and land safely in small spaces, conversely with the wing fully retracted the fs29 could cruise between lift at higher speeds, improving performance in distance/speed competitions, as well as perform aerobatics to higher load factors with faster control response.


Construction of the FS-29 was as follows:-
Construction of the fs29 was as follows:-
*Inner wing:
*Inner wing:
** Spar: Carbon Fibre Epoxy.
** Spar: Carbon Fibre Epoxy.
** Skin: Glassfibre Re-inforced Epoxy + Foam Sandwich.
** Skin: Glassfibre Re-inforced Epoxy + Foam Sandwich.
*Outer wing:
*Outer wing:
** Rectangular section: Carbon Fibre Epoxy Skin.
** Rectangular section: Carbon Fibre Epoxy Skin.
** Trapezoidal Section: Glassfibre Re-inforced Epoxy + Foam Sandwich.
** Trapezoidal Section: Glassfibre Re-inforced Epoxy + Foam Sandwich.
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*Cockpit: Glassfibre Re-inforced Epoxy + Foam Sandwich .
*Cockpit: Glassfibre Re-inforced Epoxy + Foam Sandwich .
*Tail Boom Skin: Aluminum Alloy.
*Tail Boom Skin: Aluminum Alloy.
*Tail Unit: Glassfibre Re-inforced Epoxy + Foam Sandwich (derived from the tail of the [[Schempp-Hirth Nimbus-2]].
*Tail Unit: Glassfibre Re-inforced Epoxy + Foam Sandwich (derived from the tail of the [[Schempp-Hirth Nimbus-2]]).


Extension and retraction of the outer wings was made by a screw jacks and nuts operated by the pilot pumping a handle via two-way free-wheel mechanisms, toothed belts and torque shafts which pulled or pushed the outer wings over the inner wings as required. The gap between the inside of the outer wing and the skin of the inner wing could be as much as 3mm without causing excess drag or affecting the flying qualities.
Extension and retraction of the outer wings was made by a screw jacks and nuts operated by the pilot pumping a handle via two-way free-wheel mechanisms, toothed belts and torque shafts which pulled or pushed the outer wings over the inner wings as required. The gap between the inside of the outer wing and the skin of the inner wing could be as much as 3mm without causing excess drag or affecting the flying qualities.
The FS-29 was demonstrated in flight at the {{avyear|1996}} ILA airshow at [[Berlin Tempelhof Airport]], along with the[[ Akaflieg braunschweig SB-10]] and [[SB-13]].
The fs29 was demonstrated in flight at the 1996 ILA airshow at [[Berlin Schönefeld Airport]], along with the [[Akaflieg Braunschweig SB-10 Schirokko|Akaflieg Braunschweig SB-10]] and [[Akaflieg Braunschweig SB-13 Arcus|SB-13]].
The sole FS-29 was damaged in an accident during the summer of {{avyear|1997}}, but is being re-built; meanwhile the FS-29 can be seen at the [[Deutsches Museum]] in [[Munich]].
The sole fs29 was damaged in an accident during the summer of 1997, but is being re-built; meanwhile the fs29 can be seen at the [[Deutsches Museum]] in [[Munich]].
<!-- ==Operational history== -->
<!-- == Variants == -->
<!-- ==Operators (choose)== -->


==Specifications (FS-29)==
==Specifications==
{{Aircraft specs
{{aerospecs
|ref=http://www.uni-stuttgart.de/akaflieg/index.php?id=49&L=2
|ref=https://akaflieg-stuttgart.de/en/projects/fs29-telescope-wing/
|prime units? = met
|met or eng?=<!-- eng for US/UK aircraft, met for all others. You MUST include one or the other here, or no specifications will show -->met
|crew=1
|crew=1
|capacity=
|length m= 7.16
|length m= 7.16
|length ft= 23
|length ft= 23
|length in= 6
|length in= 6
|span m= 13.3 - 19
|span m= 13.3 - 19
|span ft= 43
|span in=7in – 62 ft 3-3/4
|swept m=<!-- swing-wings -->
|swept ft=<!-- swing-wings -->
|swept in=<!-- swing-wings -->
|rot number=<!-- helicopters -->
|rot dia m=<!-- helicopters -->
|rot dia ft=<!-- helicopters -->
|rot dia in=<!-- helicopters -->
|dia m=<!-- airships etc -->
|dia ft=<!-- airships etc -->
|dia in=<!-- airships etc -->
|width m=<!-- if applicable -->
|width ft=<!-- if applicable -->
|width in=<!-- if applicable -->
|height m= 0.78
|height m= 0.78
|height ft= 2
|height ft= 2
|height in= 6-1/2
|height in= 6.5
|wing area sqm= 8.56 – 12.65
|wing area sqm= 8.56 – 12.65
|wing area sqft= 92.14 – 136.16
|wing area sqft= 92.14 – 136.16
|swept area sqm=<!-- swing-wings -->
|swept area sqft=<!-- swing-wings -->
|rot area sqm=<!-- helicopters -->
|rot area sqft=<!-- helicopters -->
|volume m3=<!-- lighter-than-air -->
|volume ft3=<!-- lighter-than-air -->
|aspect ratio=<!-- sailplanes--> 20.67 – 28.54
|aspect ratio=<!-- sailplanes--> 20.67 – 28.54
|wing profile=<!-- sailplane -->
|airfoil=<!-- sailplane --> <br>
* Rectangular part: FX 73 -170
*:'''Rectangular part:''' FX 73 -170
* Trapezoidal part: FX 73 - K - 170/22, ß=0°
*:'''Trapezoidal part:''' FX 73 - K - 170/22, β=0°
|empty weight kg= 357
|empty weight kg= 357
|empty weight lb= 787
|empty weight lb= 787
|gross weight kg= 450
|gross weight kg= 450
|gross weight lb= 992
|gross weight lb= 992
|lift kg=<!-- lighter-than-air -->
|lift lb=<!-- lighter-than-air -->

|eng1 number=
|eng1 type=
|eng1 kw=<!-- prop engines -->
|eng1 hp=<!-- prop engines -->
|eng1 kn=<!-- jet/rocket engines -->
|eng1 lbf=<!-- jet/rocket engines -->
|eng1 kn-ab=<!-- afterburners -->
|eng1 lbf-ab=<!-- afterburners -->
|eng2 number=
|eng2 type=
|eng2 kw=<!-- prop engines -->
|eng2 hp=<!-- prop engines -->
|eng2 kn=<!-- jet/rocket engines -->
|eng2 lbf=<!-- jet/rocket engines -->
|eng2 kn-ab=<!-- afterburners -->
|eng2 lbf-ab=<!-- afterburners -->
|max speed kmh=
|max speed mph=
|max speed mach=<!-- supersonic aircraft -->
|cruise speed kmh=<!-- if max speed unknown -->
|cruise speed mph=<!-- if max speed unknown -->
|stall speed kmh=<!-- aerobatic and STOL aircraft -->
|stall speed mph=<!-- aerobatic and STOL aircraft -->
|range km=
|range miles=
|endurance h=<!-- if range unknown -->
|endurance min=<!-- if range unknown -->
|ceiling m=
|ceiling ft=
|g limits=<!-- aerobatic aircraft -->
|roll rate=<!-- aerobatic aircraft -->
|glide ratio=<!-- sailplanes -->
|climb rate ms=
|climb rate ftmin=
|sink rate ms=<!-- sailplanes -->
|sink rate ftmin=<!-- sailplanes -->
|armament1=
|armament2=
|armament3=
|armament4=
|armament5=
|armament6=
}}
}}


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==References==
==References==
{{reflist}}
{{reflist}}
* http://www.uni-stuttgart.de/akaflieg/index.php?id=49&L=2
*https://akaflieg-stuttgart.de/en/projects/fs29-telescope-wing/
*{{cite book|title=Akaflieg Stuttgart 90 Jahre Forschen-Bauen-Fliegen|year=2016|publisher=Akaflieg Stuttgart e.V.|location=Stuttgart|pages=249–271|edition=1st|language=de}}
{{refbegin}}
{{refend}}


<!-- ==External links== -->
==External links==
{{commons category}}
*[https://akaflieg-stuttgart.de/en/ Akaflieg Stuttgart website]
* [https://web.archive.org/web/20120308060447/http://www.sailplanedirectory.com/PlaneDetails.cfm?planeID=110 www.sailplanedirectory.com]
{{Akaflieg Stuttgart aircraft}}


{{DEFAULTSORT:Akaflieg Stuttgart Fs-29}}
{{Aviation lists}}
[[Category:Aircraft]]
[[Category:Glider aircraft]]
[[Category:Motor-Gliders]]
[[Category:1970s German sailplanes]]
[[Category:Aircraft manufactured in Germany]]
[[Category:Aircraft first flown in 1975]]
[[Category:T-tail aircraft]]
[[Category:Akaflieg Stuttgart aircraft]]

Latest revision as of 14:46, 30 December 2023

Akaflieg Stuttgart fs29
The fs29 on display at the Deutsches Museum Flugwerft Schleißheim
Role Glider
National origin West Germany
Manufacturer Akaflieg Stuttgart
First flight 15th of June 1975
Number built 1

The Akaflieg Stuttgart fs29 TF Stadt Stuttgart is a glider designed and built in Germany from 1972.

Development

[edit]

The fs29 was designed and built to research the telescopic variable span wing. With the wing at full extension the fs29 could thermal successfully in very weak conditions and land safely in small spaces, conversely with the wing fully retracted the fs29 could cruise between lift at higher speeds, improving performance in distance/speed competitions, as well as perform aerobatics to higher load factors with faster control response.

Construction of the fs29 was as follows:-

  • Inner wing:
    • Spar: Carbon Fibre Epoxy.
    • Skin: Glassfibre Re-inforced Epoxy + Foam Sandwich.
  • Outer wing:
    • Rectangular section: Carbon Fibre Epoxy Skin.
    • Trapezoidal Section: Glassfibre Re-inforced Epoxy + Foam Sandwich.
  • Fuselage Structure: Welded steel tubing.
  • Cockpit: Glassfibre Re-inforced Epoxy + Foam Sandwich .
  • Tail Boom Skin: Aluminum Alloy.
  • Tail Unit: Glassfibre Re-inforced Epoxy + Foam Sandwich (derived from the tail of the Schempp-Hirth Nimbus-2).

Extension and retraction of the outer wings was made by a screw jacks and nuts operated by the pilot pumping a handle via two-way free-wheel mechanisms, toothed belts and torque shafts which pulled or pushed the outer wings over the inner wings as required. The gap between the inside of the outer wing and the skin of the inner wing could be as much as 3mm without causing excess drag or affecting the flying qualities. The fs29 was demonstrated in flight at the 1996 ILA airshow at Berlin Schönefeld Airport, along with the Akaflieg Braunschweig SB-10 and SB-13. The sole fs29 was damaged in an accident during the summer of 1997, but is being re-built; meanwhile the fs29 can be seen at the Deutsches Museum in Munich.

Specifications

[edit]

Data from https://akaflieg-stuttgart.de/en/projects/fs29-telescope-wing/

General characteristics

  • Crew: 1
  • Length: 7.16 m (23 ft 6 in)
  • Wingspan: 13.3–19 m (43 ft 8 in – 62 ft 4 in)
  • Height: 0.78 m (2 ft 6.5 in)
  • Wing area: 8.56–12.65 m2 (92.14–136.16 sq ft)
  • Aspect ratio: 20.67 – 28.54
  • Airfoil:
    Rectangular part: FX 73 -170
    Trapezoidal part: FX 73 - K - 170/22, β=0°
  • Empty weight: 357 kg (787 lb)
  • Gross weight: 450 kg (992 lb)

Performance

See also

[edit]

Related lists

References

[edit]
  • https://akaflieg-stuttgart.de/en/projects/fs29-telescope-wing/
  • Akaflieg Stuttgart 90 Jahre Forschen-Bauen-Fliegen (in German) (1st ed.). Stuttgart: Akaflieg Stuttgart e.V. 2016. pp. 249–271.
[edit]
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