Laister LP-46 / LP-49
The LP-49, popularly known as the 'Forty Niner', is a Standard Class single-seater that was first rolled out in prototype form, designated LP-46, on 4 July 1966. It is of metal and glassfibre construction, but designed to be sold in kit form for the amateur constructor, and more than 50 LP-49 kits had been sold by early 1976, about 35 of which had been completed and flown.
The high cantilever wings are of laminar flow section, the extruded aluminium main spar booms being curved in a chordwise direction to follow the aerofoil section; the roll contoured aluminium sheet wing skin is butt jointed and flush riveted with blind pop rivets. The semimonocoque fuselage is made up of two premoulded glassfibre halves joined over aluminium bulkheads and fittings. The tail unit is of aluminium with a swept back fin and rudder, and the landing gear consists of a shock- strutted retractable monowheel with a brake and a glassfibre nose skid with a steel shoe; a fixed shrouded tailwheel replaces the retractable tailwheel of early production aircraft. The LP-49 has an automatic aileron and dive-brake control hookup and internal control- surface counterweights.
The ship is approved for spins, loops and wing-over, and has been static tested to 12 g. The LP-49 was sold in both kit form and as a complete, ready-to-fly sailplane.
Span: 13.56 m. / 44.5 ft.
Span: 15m / 49 ft 2.5 in
Length: 20 ft 7.25 in
Wing area: 13.29 sq.m / 143 sq ft
Aspect ratio: 16.9
Airfoil: NACA 64(3)-618
Empty Weight: 215 kg / 475 lb
Gross Weight: 340 kg / 750 lb
Payload: 125 kg /275 lb
Wing Load: 25.58 kg/sq.m /5.25 lb/sq.ft
Max speed: 135 mph
Min sinking speed: 2.07 ft/sec at 50 mph
Best glide ratio: 36.5:1 at 58 mph
No. of Seats: 1
No. Built: 53