O.S. Engines
SUGGESTED PROPELLER SIZES


Suggested propeller sizes are given in the table. Note that your ideal propeller diameter, pitch, and blade area should be chosen by trial and error depending on your particular engine type, model size, and usage. Even if propellers have the same size, their properties vary considerably depending on the manufacturer. Please select blades for proper balance on the left and right.  

Never touch, or allow any object to come into contact with, the rotating propeller and do not crouch over engine when it is running.


TWO-STROKE ENGINES
DIA X PITCH
 
Running-in
Trainer / Sport
10LA
7x4
7x3-5,8x4
25LA
9x5
9x5-6
46LA
11x6
11x6-7
65LA
12x6
12x7-8,13x6-8
  Running-in
Aerobatic / Sport
25LA-S
9x6
9x6,10x5
40LA-S
11x5
11x5-6
46LA-S
11x6
11x6-7,12x5-6
 
Sport
Aerobatic
15CV-A 7x5-6,8x4-6,9x4 8x4-6
25AX 9x5-6,9.5x5,10x5 -----
35AX BE 10x6-7,10.5x6,11x6 -----
46AX 10.5x6,11x6-8,12x6-7 -----
55AX-BE 12×7-8,13×6-7 -----
61FX 12x6-8,13x6-7 -----
75AX 13x8-10,14x6-8 -----
75AX-BE 13x9-10,14x6-8,15x6 -----
120AX RING 15x10-12,16x8-10 -----
120AX RING-BE 15x10-12,16x8-10 -----
140RX ----- 16x14,17x13
160FX RING 15x13-14,16x12-14,
17x12-13,18x8-10,20x8
-----
BGX-1 RING(RN) 18x10-12,20x8-10 18x10-12,20x8-10
 
Running-in
Sport/Acro/Scale
GT33 18x8 18x10,18x12,19x10,20x8,20x10
GT22 15x10 16x8,16x10,17x6,17x8


FOUR-STROKE ENGINES
 
Single-cylinder
Sport & Stant
Scale
FS-30S 9x6-7,10x4 10x5-6
FS-40S 10x7-7.5,11x6 10x7,10.5x6,11x7,
12x5-6
FSα-56 12x6-8,13x6 12x6-8,13x6-7
FL-70 12x7,12.5x6,13x6 12.5x6,13x6-7
FSα-72 12x7-8,13x6-8,14x6-7 12x7-8,13x6-8,14x6-7
FSα-81 13x7-9,14x6-7 13x7-9,14x6-7
FSα-81-P 13x7-8,14x6-8 13x7-8,14x6-8
FS-91S II
FS-91S II-P
11x11-12,12x10-12,13x9 13x9,14x7,15x6,16x6
FSα-110 13x9-11,14x8-10 15x8,16x8
FSα-110-P 13x9-11,14x8-10,
15x8,16x8
13x9-11,14x8-10,15x8,16x8
FSα-155-P 16x8-12,17x8-12 16x8-12,17x8-12
FS-120S-E 13x11-12,14x10-11,
15x8,16x6-7
15x8,16x6-7,18x5-6
FS-200S-P 16x12N-15,16.5x12-14,
17x10N-13,18x6W-12,
20x8
16x12N-15,16.5x12-14,
17x10N-13,18x6W-12,
20x8
FS-200S 15x12-14,16x12-14,
17x10-13,17x12-13,
18x6-10,18x8-12,20x8
15x12-14,16x12-14,
17x10-13,17x12-13,
18x6-10,18x8-12,20x8
Twin & Multi-cylinder
Sport & Scale
IL-300
18x10-12,20x8-10,22x8
FT-300 (Super Gemini-300)
18x10-12,20x8-10,22x8
FR5-300 (Sirius)
18x10-12,20x8-10,22x8


WANKEL ROTARY ENGINES
 
ROTARY ENGINE
Sport & Scale
ROTARY ENGINE 49PI TypeII
9x6-7,10x4-6,11x4-5



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