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Seedwings Inc Sunseed
The 1975 Sunseed is a double surface, diffuser tip flying wing. It has outboard control surfaces. Canted tip wings provide self righting characteristic. It has a fibreglass leading edge with an aluminium trailing edge wedge. Draggons on the wing tips can be operated as glide path control devices to reduce glide angle from 12-1 to 5-1. The wing tip design provides induced drag and tip vortex reduction. The lower wing surface is ribless.
The airframe is made from 2024-T3 anodised aluminium. Rigging cable is 3/32in 7 x 7 stainless steel aircraft qualiy, vinyl coated. Hardware is all aircraft quality parts. The sail is 1.8oz stabilised dacron and is fitted with zippers and Velcro tapes. There was the option of seated or prone harnesses.
The Sunseed dissembles to a bundle 10 ft long and 1 ft in diameter.
The Sunseed has a stable stance even in steep turns with no tendency to dive or stall.
The run out distance before touchdown is about four times that of a Rogallo. It has a 13.7% airfoil and a load factor of 6G.
Wing span: 32.8 ft
Wing area: 128.5 sq,ft
Aspect ratio: 8.36
Wing sweep: 15˚
Weight: 50 lb
Pilot weight: 125-180 lb
Takeoff speed: 15 mph
Stall speed: 16 mph
Max speed: 40 mph
Best glide ratio (L/D): 12-1
Best L/D speed: 25 mph
Min sink: 275 fpm

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