A Handy Conversion Chart for Model Airplane Engines

While most of the servos and motors we carry won’t fit into RC planes, it doesn’t mean we don’t have a soft spot for the hobby. Here’s a handy conversion chart for when you just need the information quickly. You can contact AX Control, Inc at 1-919-372-8413 if you have any questions about our extensive inventory of surplus and reconditioned drives, drive boards, motor controllers, power supplies, and servos.

1 HP= 746 Watts

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

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