- Glasflügel H-201
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The Glasflügel H-201 Standard "Libelle" (German: "Dragonfly") is an early
composite Standard Class single-seatsailplane produced byGlasflügel from 1967.Development
The H-201 Standard Libelle was a follow-on Standard Class sailplane to the successful H-301 Libelle Open Class glider. It was similar to the H-301, with modifications to meet the Standard Class requirements. The prototype made its first flight in October 1967, with a total of 601 being built. The type soon made its mark in contest flying; one flown by Per-Axel Persson of Sweden, winner of the 1948 World Championships, came second in the Standard Class at the 1968 World Championships at Leszno in Poland.
The Libelle and Standard Libelle were very popular and influential designs. Their very light wings and extremely easy rigging set a new benchmark. Their handling is generally easy except that they are quite sensitive to sideslipping and have relatively ineffective
airbrake s that make short landings tricky for inexperienced pilots.The Standard Libelle was superseded by the Hornet.
Design
The Standard Libelle is of similar glassfibre construction to the H 301 Libelle. The changes required to consisted of removing the flaps and tail braking parachute, fitting a fixed instead of retractable monowheel and raising the height of the canopy. A new Wortmann wing section was featured and terminal velocity dive brakes were fitted.
With a change in the Standard Class rules, the H-201B of 1969 introduced a retractable gear and a water ballast system as an option, with one 25 litre bag per wing located before the spar, with valve and dumping orifice on the fuselage underside. Other improvements in the B variant were larger upper surface dive brakes, a larger stabilizer for better low-speed handling, PVC foam sandwich core for the wing (instead of balsa) to increase durability and profile accuracy, increased gross weight and higher operating speeds.
The canopy is unusual in having a catch that enables the front to be raised by 25mm in flight to provide a blast of ventilating air if required, instead of the more conventional small sliding panel used for this purpose.
The connections for airbrakes and elevator are automatic. The aileron connections are manually connected.
Variants
* Glasflügel 202 (1 built)
* Glasflügel 203 (2 built)
* Glasflügel 204 (1 built)
* Glasflügel 205 Club Libelle with a high-set wing and fixed undercarriage intended for less experienced pilots (176 built)pecifications (H-201B)
aerospecs
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met or eng?= metcrew=One pilot
capacity=50 kg (110 lb) water ballast
length m=6.19
length ft=20
length in=4
span m=15.00
span ft=49
span in=3
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width m=
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height m=1.25
height ft=4
height in=1
wing area sqm=9.8
wing area sqft=105
swept area sqm=
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rot area sqm=
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volume m3=
volume ft3=
aspect ratio= 23
empty weight kg=ca. 185
empty weight lb=407
gross weight kg=350
gross weight lb=770
lift kg=
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eng2 number=
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eng2 lbf-ab=max speed kmh=250
max speed mph=160
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range km=
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glide ratio= ca. 34.5
climb rate ms=
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sink rate ms= 0.57
sink rate ftmin= 112armament1=
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lists=References
*Thomas F, Fundamentals of Sailplane Design, College Park Press, 1999
*Simons M, Segelflugzeuge 1965-2000, Eqip, 2004
* [http://www.sailplanedirectory.com/ Sailplane Directory]
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