Propeller conversion chart

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    Tom Neff
    Keymaster

    PROP CHART FOR 2-STROKE ENGINES

    ENGINE SIZE
    (CU. IN.)

    STARTING PROPELLER

    ALTERNATE PROPELLER

    .049

    6-3 5.25-4, 5.5-4, 6-3, 6-4, 7-3
    .09 7-4 7-3, 7-4, 7-5
    .15 8-4 8-5, 8-6, 9-4
    .19 – .25 9-4 8-5, 8-6, 9-5
    .29 – .30 9-6 9-7, 9.5-6, 10-5
    .35 – .36 10-6 9-7, 10-5, 11-4
    .40 10-6 9-8, 11-5
    .45 10-7 10-6, 11-5, 11-6, 12-4
    .50 11-6 10-8, 11-7, 12-4, 12-5
    .60 – .61 11-7 11-7.5, 11-7.75, 11-8, 12-6
    .70 12-6 11-8, 12-8, 13-6, 14-4
    .78 – .80 13-6 12-8, 14-4, 14-5
    .90 – .91 14-6 13-8, 15-6, 16-5
    1.08 16-6 15-8, 18-5
    1.2 16-8 16-10, 18-5, 18-6
    1.5 18-6 18-8, 20-6
    1.8 18-8 18-10, 20-6, 20-8, 22-6
    2.0 20-8 18-10, 20-6, 20-10, 22-6

    PROP CHART FOR 4-STROKE ENGINES

    ENGINE SIZE
    (CU. IN.)
    STARTING PROPELLER ALTERNATE PROPELLER
    .20 – .21 9-6 9-5, 10-5
    .40 11-6 10-6, 10-7, 11-4, 11-5, 11-7, 11-7.5, 12-4, 12-5
    .45 – .48 11-6 10-6, 10-7, 10-8, 11-7, 11-7.5, 12-4, 12-5, 12-6
    .60 – .65 12-6 11-7.5, 11-7.75, 11-8, 12-8, 13-5, 13-6, 14-5, 14-6
    .80 13-6 12-8, 13-8, 14-4, 14-6
    .90 14-6 13-6, 14-8, 15-6, 16-6
    1.20 16-6 14-8, 15-6, 15-8, 16-8
    1.60 18-6 15-6, 15-8, 16-8, 18-6
    2.40 18-10 18-12, 20-8, 20-10
    2.70 20-8 18-10, 18-12, 20-10
    3.00 20-10 18-12, 22-8

    MODEL AIRPLANE ENGINE SIZE CONVERSION CHART

    CUBIC INCHES = CUBIC CENTIMETERS

    .049 CU. IN. = .8 CC
    .09 CU. IN. = 1.5 CC
    .15 CU. IN. = 2.5 CC
    .19 CU. IN. = 3.1 CC
    .21 CU. IN. = 3.5 CC
    .25 CU. IN. = 4.1 CC
    .29 CU. IN. = 4.8 CC
    .35 CU. IN. = 5.7 CC
    .40 CU. IN. = 6.5 CC
    .46 CU. IN. = 7.5 CC
    .50 CU. IN. = 8.2 CC
    .61 CU. IN  = 10.0 CC
    .80 CU. IN. = 13.0 CC
    .91 CU. IN. = 14.9 CC
    1.20 CU. IN. = 20.0 CC
    1.50 CU. IN. = 25.0 CC
    1.60 CU. IN. = 26.2 CC
    1.80 CU. IN. = 30.0 CC
    2.00 CU. IN. = 32.8 CC
    2.40 CU. IN  = 39.3 CC
    2.70 CU. IN. = 44.3 CC
    3.00 CU. IN  = 49.2 CC

    ENGINE CRANKSHAFT THREAD SIZE

    ENGINE SIZE DESCRIPTION CRANKSHAFT THREAD
    COX .010 ALL MODELS 2-56
    COX .020 ALL MODELS 3-48
    COX .049 – .51 ALL MODELS 5-40
    COX .09 ALL MODELS 6-32
    ENYA .09 – .11 2-CYCLE 5MM X .8
    ENYA .15 2-CYCLE 6MM X 1.0
    ENYA .19 – .21 2-CYCLE 1/4 – 28
    ENYA .29 – .60 2-CYCLE 7MM X 1.0
    ENYA .25 – .45 2-CYCLE SPORT 1/4 – 28
    ENYA .46 – .80 4-CYCLE 7MM X 1.0
    ENYA .90 4-CYCLE 7MM X 1.0
    ENYA 1.20 4-CYCLE 8MM X 1.0
    FOX .15 ALL MODELS 10-32
    FOX .19 – .50 ALL MODELS 1/4 – 28
    FOX .60 – .78 ALL MODELS 5/16 X 24
    HB .12 – .15 ALL MODELS 5MM X .8
    HB .20 – .61 ALL MODELS 1/4 – 28
    HP .21 – .61 ALL MODELS 1/4 – 28
    IRVINE .20 .61 ALL MODELS 1/4 – 28
    K&B .15 ALL MODELS 10 – 32
    K&B .19 – .65 ALL MODELS 1/4 – 28
    MAGNUM .21 – .61 ALL MODELS 1/4 – 28
    MERCO .35 – .60 ALL MODELS 1/4 – 28
    O.S. .10 ALL MODELS 5MM X .8
    O.S. .15 ALL MODELS 10 – 32
    O.S. .20 – .50 2-CYCLE 1/4 – 28
    O.S. .61 – .91 2-CYCLE 5/16 – 24
    O.S. 1.08 – 2.1 1.08FSR, BGX-1, 3500 3/8 – 24
    O.S. .20 – .61 4-CYCLE 1/4 – 28
    O.S. .70 – 1.60 4-CYCLE 5/16 – 24
    O.S. 2.40 FF-240 5/16 – 24
    O.S. 2.40 – 3.20 FT-240, FT-300, FR5-300 3/8 – 24
    PICCO .21 – .45 ALL MODELS 1/4 – 28
    PICCO .60 ALL MODELS 8MM X 1.25
    QUADRA 2.0 Q-35 5/16 X 24
    ROSSI .21 ALL MODELS 1/4 – 28
    ROSSI .40 – 1.05 ALL MODELS 8MM X 1.25
    ROYAL .21 – .46 ALL MODELS 1/4 – 28
    SAITO .40 – .60 4-CYCLE 6MM X 1.00
    SAITO .45 – .91 4-CYCLE 7MM X 1.00
    SAITO .65 – .90 4-CYCLE 7MM X 1.00
    SAITO 1.20 – 2.70 4-CYCLE 8MM X 1.25
    SAITO 1.20 – 3.00 4-CYCLE 8MM X 1.25
    SUPER TIGRE .11 – .15 ALL MODELS 5MM X .8
    SUPER TIGRE .19 – .56 ALL MODELS 1/4 – 28
    SUPER TIGRE .60 G & ST SERIES 1/4 – 28
    SUPER TIGRE .61 – .90 ALL OTHER MODELS 5/16 – 24
    SUPER TIGRE 1.20 – 1.80 S-2000, S-2500, S-3000 10MM X 1.25
    WEBRA .20 – .61 ALL MODELS 1/4 -28
    WEBRA .80 – .90 ALL MODELS 8MM X 1.25
    YS .45 – .60 ALL MODELS 8MM X 1.25

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