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 Free Flight Systems Sierra
 
FFS-Sierra2-01
Sierra II
 
The Sierra II has an adjustable centre of gravity plate, skid late, adjustable wing stiffeners, 5ft control bar and a ‘shur-lok’ quick release spreader bar tha allows for speedy folding of the wing without tools.
 
The airframe is made from 6061-T6 1.5in x .058 aluminium tubing. All airframe parts are anodised in gold or black, fully sleeved and doweled.
 
The rigging is stainless steel 3/32in 7x7 aircraft qualiy, all vinyl coated. All harwre is aircraft quality stainless steel and aluminium.
 
The sal is 3.8oz Howe & Bainbridge stabilised dacron that wasin 11 colours. It has 8in reinforced wing pockets and a non-symetrically cut trailing edge. A prone harness was included.
 
The Sierra III was a high performance glider with a deep scalloped centre section cambered keel. It was for advanced pilots only because of its very fast handling and long glide ratio. This model has an adjustable centre gravity plate, skid plate, 5 ft control bar, and a “shur-lok” quick release spreader bar that allows for speedy folding of the wings without tools.
 
FreeFlt-Sierra3-01
Sierra III
 
The Sierra III airframe is made from 6051-T6 1.5in x .058 aluminium tubing. All airframe parts are anodised in gold or black, fully sleeved and doweled. Rigging is stainless steel 3/32 in 7 x 7 aircraft quality, all vinyl coated, and the hardware is all aircraft quality stainless steel and aluminium parts.
 
The sail is made from 3.8oz Howe and Bainbridge stabilisd dacron in a choice of 11 colours. He sail has tapered leading edge pockets, triple flared wing tips to increase the tip chord, and three tapered tubular fibreglass batten per side. A prone harness was included.
 
Sierra II 19x17
Leading edge: 19 ft
Keel length: 17.5 ft
Wing span: 26.9 ft
Wing area: 185 sq,ft
Aspect ratio: 3.9
Nose angle: 90˚
Sail billow: 3.5˚
Weight: 40 lb
Pilot weight: 105-150 lb
off speed: 12 mph
Stall speed: 14 mph
Max speed: 50 mph
Best glide ratio (L/D): 6-1
Best L/D speed: 26 mph
Min sink: 300 fpm
 
Sierra II 20x18
Leading edge: 20 ft
Keel length: 18.5 ft
Wing span: 28.2 ft
Wing area: 208 sq,ft
Aspect ratio: 3.9
Nose angle: 90˚
Sail billow: 3.5˚
Weight: 45 lb
Pilot weight: 130-80 lb
off speed: 12 mph
Stall speed: 14 mph
Max speed: 50 mph
Best glide ratio (L/D): 6-1
Best L/D speed: 26 mph
Min sink: 300 fpm
 
Sierra II 21x19
Leading edge: 21 ft
Keel length: 19.5 ft
Wing span: 29.8 ft
Wing area: 230 sq,ft
Aspect ratio: 3.9
Nose angle: 90˚
Sail billow: 3.5˚
Weight: 48 lb
Pilot weight: 180-240 lb
Takeoff speed: 12 mph
Stall speed: 14 mph
Max speed: 50 mph
Best glide ratio (L/D): 6-1
Best L/D speed: 26 mph
Min sink: 300 fpm
 
Sierra III
Leading edge: 20 ft
Keel length: 12 ft
Wing span: 32 ft
Wing area: 187 sq,ft
Aspect ratio: 5.8
Nose angle: 105˚
Sail billow: 1.5˚
Weight: 45 lb
Pilot weight: 110-210 lb
Takeoff speed: 15 mph
Stall speed: 15 mph
Max speed: 45 mph
Best glide ratio (L/D): 7-1
Best L/D speed: 28 mph

 

FFS-Sierra2-ld
Sierra II
 

 

FreeFlt0Sier3-ld
 
Sierra III

 

 

 
 
 
 


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