4 Cycle Props
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 General Suggested Prop Sizes for 4 cycle Engines by Engine Size		  

FORUM CONTENTS

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2 Cycle Props
4 Cycle Props
Prop Balancing
Load Factors
By Manufacturer
Engine Size Basic Prop Alternate Props Load Factor
.20 - .21  9-6  9-5, 10-5  23 - 25
.40  11-6  10-6, 10-7, 11-4, 11-5 11-7, 12-4, 12-5  26 -29
.45 - .48  11-6  10-6, 10-7, 10-8, 11-7, 
12-4, 12-5, 12-6 		 26 - 30
.60 -.65  12-6  11-7, 11-8, 
12-8, 13-5, 13-6, 14-5, 14-6 		 30 - 34
.80  13-6  12-8, 13-8, 14-4, 14-6  32 -34
.90  14-6  13-6, 14-8, 15-6, 16-6  32 - 38
1.20  16-6  14-8, 15-6, 15-8, 16-8, 17-6, 18-5, 18-6  36 - 42
1.60  16-6  15-6, 15-8, 16-8, 18-6, 
18-8, 20-6 		 36 - 46
2.40  18-10  18-12, 20-8, 20-10  46 - 50
2.70  20-8  18-10, 18-12, 20-10  46 - 50
3.00 
 20-10  18-12,  48 - 50
Recommended Prop size by Manufacturer
  Break-in Alternate Props Load Factor
SAITO
      FA .65 12x6 Scale   12x6,  12x8,  13x8   
Sport    13x8   14x5   14x6
   3D     11x9    12x8   13x6
MAGNUM
   52      
   91

 

    
XL-1.20
RFS		 15-6 15x6, 15x8, 15x10,16x6, 16x8 36 to 40