XL Series Aircraft Engines
 

Engine Bore (mm) Stroke (mm) Practical r.p.m. Power (b.h.p.) Weight (gram/ounce) Normal Propeller Shaft Threads
XL 15A 15.0 14.0 3,000-18,000 .45 165 / 5.8 7x6, 8x4 6 mm
XL 25A 18.0 16.0 2,200-12,500 .80 296 / 10.5 9x5, 9x6 1/4-28
XL 28A 18.55 18.4 2,200-12,800 .87 287 / 10.1 9x5, 9x6 1/4-28
XL 32A 19.0 23.0 2,200-13,000 .97 330 / 11.6 9x6, 10x5 1/4-28
XL 36A 20.0 23.0 2,200-13,200 1.10 311 / 11.0 9x6, 10x5 1/4-28
XL 40A 20.66 19.28 2,000-12,500 1.24 423 / 14.9 10x6, 11x5 1/4-28
XL 40AII 20.66 19.28 2,000-12,500 1.24 423 / 14.9 10x6, 11x5 1/4-28
XL 46A 22.25 19.28 2,000-12,800 1.43 418 / 14.7 10x7, 11x6 1/4-28
XL 46AII 22.25 19.28 2,000-12,800 1.43 418 / 14.7 10x7, 11x6 1/4-28
XL 53A 23.7 19.28 2,000-12,800 1.54 424 / 14.9 11x5, 11x6 1/4-28
XL 53AII 23.7 19.28 2,000-12,800 1.54 424 / 14.9 11x5, 11x6 1/4-28
XL 61A 24.0 22.0 2,000-12,000 1.89 609 / 21.5 11x7, 12x6 5/16-24
XL 61AR 24.0 22.0 2,000-12,000 1.85 609 / 21.5 11x7, 12x6 5/16-24
XL 75A 26.8 22.0 2,000-12,000 2.30 614 / 21.7 12x6, 13x6 5/16-24
XL 91A 27.5 26.0 2,000-12,000 2.68 672 / 23.7 13x6, 14x5 5/16-24
XL 108A 28.0 26.0 2,000-12,000 3.00 672 / 23.7 13x7, 14x6 3/8-24
XL 120AR 28.5 29.0 1,800-9,000 3.75 854 / 30.1 15x6, 16x6 3/8-24
XL 180AR 35.0 30.0 1,800-10,000 5.20 1560 / 55.0 16x12, 18x8 3/8-24

Four Stroke R/C Airplane Engines

Engine Bore (mm) Stroke (mm) Practical r.p.m. Weight (gram/ounce) Normal Propeller Shaft Threads
FS 52AR 23.0 21.0 2,000-10,500 399 / 15.7 10x8 - 12x6 1/4-28
FS 80AR 26.5 23.2 2,000-11,000 564 / 22.2 12x8 - 13x6 5/16-24
FS 91AR 27.7 24.8 2,000-11,000 569 / 22.4 13x8 - 14x6 5/16-24
FT 160AR Twin 26.5 23.5 2,000-10,000 1280 / 45.1 15x8-10 - 16x6-8 5/16-24