PROPS FOR SPORTS 4-CYCLE ENGINE

The most common mistake with 4-stroke (cycle) engines is to under-prop them, especially under pitched. It must be noted that 4-stroke engines rev slower than 2-strokes, hence when used in a similar model the 4-strokes must use a high pitch prop to fly at the same speed.

Higher pitch props. Although lacking in initial acceleration usually deliver a much smoother style of flying for reduced noise levels.

Below is a suggested prop size for the OS range of engines. Other brands (Saito, Enya etc.) will be similar.

FS 120 Supercharged 16.5 x 12.5, 15.5 x 10, 15 x 11, 14 x 10 3B, 14 x 10 4B

FS 120 Surpass 15.5 x 10, 15.5 x 8, 14.5 x 12.5, 14 x 10 3B, 14 x 10 4B

Old FS 120 15.5 x 8, 15 x 7, 13.75 x 10, 12 x 10 3B, 12.5 x 11.5 3B

FS 91 Surpass 14 x 8, 13.75 x 10, 13.25 x 10, 12 x 10 3B

FS 90 14 x 8, 13.25 x 10, 13 x 7, 12.5 x 8 3B

FS 70 Surpass 14 x 6, 13 x 7, 12 x 8, 12.5 x 8 3B,

FS 61 13 x 6, 12 x 6, 11.25 x 8, 11 x 7.5 3B, clubman 12.5 x 6 (nya)

FS 48 Surpass 11.25 x 8, 11.5 x 6.5, clubman 11.5 x 6 or 11.5 x 7

FS 40 Surpass 10.5 x 8, 11 x 6, 12 x 4, clubman 10.5 x 7

FS 40 11 x 6, 10.5 x 8, 11.5 x 6.5, clubman 10.5 x 6

FS 26 Surpass 9.5 x 4.5, 9.5 x 7, 10 x 6, clubman 9.5 x 6

The list is not complete, as it does not list many of the alternative 2-blade pattern, 3 or 4 blade choices.

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