Laister LP-15 Nugget
Laister-Kauffman Aircraft Corp was later succeeded by Laister Sailplanes Inc and in 1970 Jack Laister and his son Bill, an aerodynamicist, started design work on the LP-15 Nugget Standard Class single-seater of metal construction.
It is a cantilever shoulder-wing monoplane with a T-tail and long-span flaps which are raised slightly for high speed flight, are lowered 8° for soaring in thermals and can be extended to 85° for use as air brakes. Up to 185lb of water ballast can be carried on the center of gravity. The wings and top-hinged plain ailerons are of Chem-Weld bonded aluminium alloy construction, while the semi-monocoque fuselage has the forward portion of moulded glassfibre and the rear part of bonded aluminium alloy construction which incorporates the swept fin. Landing gear consists of a retractable monowheel and the pilot sits in a semi-reclining seat under a two-piece canopy with a removable section and a sliding ventilation panel.
They decided to wait for the recommendations of the CIVV conference on Standard Class requirements before starting construction of the prototype in February1971, and this first flew in June that year, its maiden flight also being a contest flight; the Nugget was certificated in mid-1975.
The ship was available only as a factory-built product and 15 were built. One Nuget belongs to the National Soaring Museum.
Wingspan: 15m / 49 ft 2.5 in.
Wing area: 10.13sq.m / 109sq.ft
Airfoil: Wortmann FX 67170/150
Wing aspect ratio: 22.2
Length: 21 ft
Height: 4ft 2in
Gross Weight: 408kg / 900lb
Empty Weight: 193kg / 425lb
Wing loading: 40.27 kg/sq.m / 8.26 lb/sq ft
Payload: 215kg / 475lb
Water Ballast: 84kg / 185lb
Max airspeed: 135 kts
Rough air speed: 135 kts
Stall: 31 kt
Lift to drag: 37 at 93 kph / 50 kts / 58 mph
Sink: 0.66 m/s / 2.16 fps / 1.29 kt at 43 kts