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| 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 |
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| 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 |
