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Maupin Windrose

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Designed by Jim Maupin and Irv Culver to meet SHA Homebuilt Sailplane Design Contest criteria: easy to built, low cost, soarable, self-launching, safe, the definitive powered Windrose first flew in 1984. The structural backbone is a hollow plywood box with corners longerons which carry the engine mounts, landing gear and fiberglass cockpit shell. The wings are shaped foam covered with fiberglass, but without a conventional spar. The spars are bands of unidirectional roving expoxied into recesses in the upper and lower wing skins, and separated by rows of vertical dowels between the bands to take compression loads off the foam. Ailerons are set inboard from the root to approximately two-thirds span operated by pushrods from the fuselage. The wing structure is free of controls, pushrods, cables etc. Glidepath control is by a triangular spoiler which rises above the wing center section. Both tail surfaces are all-moving. The design comes in 12.65 and 15.0 m models.
Windrose was offered as partial or complete kit, or plans only. Plans used to cost $175 in the US and Canada, airmail overseas for $195.

The Windrose II motor glider has an optional shorter wing span or Cuyuna UL-II-02 engine.

Windrose
Wing span: 12.65 m / 41.5 ft
Wing area: 8.92 sq.m / 96 sq.ft
Aspect ratio: 17.9
Empty weight: 355 lb
Gross weight: 565 lb
Wing loading: 5.93 lb/sq.ft.
Airfoil: Culver
Seats: 1

Windrose
Engine: 25 kW/ 33 bhp Cuyuna ULII-02 / Rotax 503, 46 hp
Wing span: 12.65 m / 41.5 ft
Wing area: 8.92 sq.m / 96 sq.ft
Empty Weight: 177 kg / 390 lb
Payload: 95 kg / 210 lb
Gross Weight: 272 kg / 600 lb
Wing Load: 28.51 kg/sq.m / 6.3 lb/sq.ft
Aspect ratio: 17.9
L/D Max: 29 84 kph / 45 kt / 52 mph
Min Sink: 0.70 m/s / 2.3 fps / 1.36 kt at 46 mph
Airfoil: Culver
Seats: 1

Windrose
Gross Wt. 650 lb
Empty Wt. 440 lb
Wingspan 41’7”
Wing area 95.25 sq.ft
Aspect ratio 18.25 to 1
Wing loading 6.82 lb/sq.ft
Engine 35-hp Cuyuna UL 11-02
Takeoff run, standard day 600 ft
Climb rate 500 fpm @ 52 mph
L/D max 30/1 @ 49 mph
Min sink 2.3 fps @ 41.5 mph.

Windrose 15M
Wing span: 15m / 49.2 ft
Wing area: 9.54 sq.m / 102.66 sq.ft
Empty Weight: 232 kg / 512 lb
Payload: 104 kg / 228 lb
Gross Weight: 336 kg / 740 lb
Wing Load: 37.67 kg/sq.m / 7.7 lb/sq.ft
Seats: 1
L/DMax: 38 82 kph/ 44 kt/ 51 mph
MinSink: 0.56 m/s / 1.85 fps/ 1.10 kt
Aspect ratio: 23.26
Airfoil: Culver
Engine: 34 kW/ 46 bhp Rotax 503

Windrose II
Cruise: 132 mph
Stall: 50 mph
ROC: 700 fpm
Take-off dist: 500 ft
Landing dist: 300 ft
Service ceiling: 13,000 ft
Engine: Rotax 503, 46 hp
Fuel cap: 5 USG
Weight empty: 512 lb
Gross: 740 lb
Length: 21.6 ft
Wing span: 49.2 ft
Wing area: 102 sq.ft
Seats: 1
Landing gear: single wheel

 

 


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