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Strojnik S-2

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The Strojnik S-2 is an American high-wing, single-seat motor glider that was designed and built by Aleš Strojnik. Said, Bob: 1983 Sailplane Directory, Soaring Magazine, page 133. Soaring Society of America, November 1983. USPS 499-920

Design and development

Strojnik completed and flew his S-2 design in 1980.
The S-2 is of mixed construction. The span wings consist of fiberglass skins built around a carbon fiber and aluminium spars. The wings employ a Wortmann FX 67-170/17 airfoil and have flaps for glidepath control. The wings are a constant chord design, with tapered wing tips. The fuselage is a pod-and-boom design, with the cockpit area made from wood, covered in fiberglass and the tail boom made from aluminium. The tail surfaces are of carbon fiber structure, covered in fiberglass. The powerplant is a Kohler Company engine of that drives a folding two-bladed propeller. The engine is mounted in pusher configuration behind the cockpit, with the tail boom running underneath the propeller. The landing gear consists of two small wheels mounted in tandem on the fuselage centerline.
A two-seat version with the same external dimensions was reportedly under development in 1983.
Strojnik reported that 22 sets of plans had been sold by 1983.

Operational history

Strojnik earned his silver badge flying the S-2. The prototype S-2 is no longer on the Federal Aviation Administration registry, but at least eight were built and in July 2011 six remain on the US register, including three S-2s and three S-2As.

Variants

;S-2
Initial version
;S-2A
Improved version
;S-4 "Laminar Magic"
One-off, registration number N85AS. Smaller, short-wing version, which set a US national aviation speed record in FAI Category C-1a/0 (European microlight, under 300kg gross weight) in 1987.
;S-5
One-off aircraft, registration number N51152. Added slightly greater wingspan to existing S-4 fuselage for better performance in recreational flying.

Specifications (S-2)

{{Aircraft specs
ref=Sailplane Directory and Soaring
prime units?=imp
genhide=
crew=one
capacity=
length m=
length ft=22.6
length in=
length note=
span m=
span ft=49.2
span in=
span note=
height m=
height ft=
height in=
height note=
wing area sqm=
wing area sqft=127
wing area note=
aspect ratio=19:1
airfoil=Wortmann FX 67-170/17
empty weight kg=
empty weight lb=617
empty weight note=
gross weight kg=
gross weight lb=980
gross weight note=
fuel capacity=
more general=
eng1 number=1
eng1 name=Kohler Company
eng1 type=
eng1 kw=
eng1 hp=28
prop blade number=2
prop name=folding
prop dia m=
prop dia ft=
prop dia in=
prop note=
perfhide=
max speed kmh=
max speed mph=
max speed kts=
max speed note=
cruise speed kmh=
cruise speed mph=
cruise speed kts=
cruise speed note=
stall speed kmh=
stall speed mph=38
stall speed kts=
stall speed note=at a wing loading of 6.6 lb/sq ft
never exceed speed kmh=
never exceed speed mph=149
never exceed speed kts=
never exceed speed note=
range km=
range miles=
range nmi=
range note=
endurance=
ceiling m=
ceiling ft=
ceiling note=
g limits=
roll rate=
glide ratio=34:1 at
climb rate ms=
climb rate ftmin=350
climb rate note=
sink rate ms=
sink rate ftmin=132
sink rate note= at
lift to drag=
wing loading kg/m2=
wing loading lb/sqft=7.7
wing loading note=
more performance=
avionics=

See also


External links

  • S-2A photos
  • Category:1980s United States sailplanes
    Category:Homebuilt aircraft
     
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