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CONVERSION CHARTS

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  UNIT                         SYMBOL                                  10 MM     =    1 CM     
                                                                                         25 MM     =     1 IN.
                                                                                        One Ounce =  29.5CC
  MILLIMETER         MM                                O/027 GAUGE  =      1/48 SCALE
  CENTIMETER         CM                                    HO   GAUGE  =     1/87 SCALE
                                                                                   N   GAUGE  =     1/160 SCALE
                                                                                   G   GAUGE  =     1/24 SCALE

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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