GP Airplane Engines

Displacement: 0.069 cu in (1.13 cc)
Bore: 0.472 in (12 mm)
Stroke: 0.394 in (10 mm)
Crankshaft: M4x0.7
Practical RPM: 3,000 - 18,000
Output: 0.19 hp @ 17,000 RPM
Weight w/muffler: 3.33 oz (94.4 g)

Displacement: 0.277 cu in (4.53 cc)
Bore: 0.763 in (18.7 mm)
Stroke: 0.65 in (16.5 mm)
Practical RPM: 2,500 - 16,000
Output: 0.70 hp @ 15,000 RPM
Weight w/muffler: 7.80 oz (221.1 g)

Displacement: 0.396 cu in (6.49 cc)
Bore: 0.0.835 in (21.2 mm)
Stroke: 0.724 in (18.4 mm)
Crankshaft: UNC 1/4 / 28
Practical RPM: 2,000 - 17,000
Output: 1.10 hp @ 16,000 RPM
Weight w/o muffler: 12.6 oz (357.2 g)

Displacement: 0.646 cu in (10.58 cc)
Bore: 0.953 in (24.2 mm)
Stroke: 0.906 in (23.0 mm)
Crankshaft: UNC 5/16 / 24
Practical RPM: 2,000 - 16,000
Output: 2.00 hp @ 15,000 RPM
Weight w/o muffler: 24.46 oz (693.4 g)