Torque chart for Super Sport model airplane rubber in 1/8″ size. This is my conservative starting point for rubber motors in various sizes that I use when flying. While different batches of rubber can yield far different results, this chart does give you a good starting point and basic information on what super sport rubber can take.
I find that I often exceed these limits but prefer to wind to approximately 75% of maximum torque and get more flights out of the rubber motor. In heated competition, this is not always possible and you find yourself pushing the winding to the limits. Winding to a lower level of torque and gradually increasing it on each flight allows the rubber to be broken in for multiple flights on a single motor.
It is always a good idea to test your own batches of rubber so you can come to your own conclusions on the quality rubber you have.
Conservative breaking torque in inch ounces for 1/8 Inch Super Sport Rubber Motors
| Strands of Rubber | Torque Inch Ounces | |
| 4 | 5 | |
| 6 | 7.5 | |
| 8 | 10 | |
| 10 | 15 | |
| 12 | 20 | |
| 14 | 25 | |
| 16 | 30 | |
| 18 | 35 | |
| 20 | 40 | |
| 22 | 45 | |
| 24 | 50 | |
| 26 | 55 | |
| 28 | 60 | |
| 30 | 65 | |
| 32 | 70 | |
| 34 | 75 | |
| 36 | 80 |
I was looking for exactly this info, thinking winding to torque makes sense. But, whata bout other sizes of rubber,:1/16″, 3/32″? Can values be extrapolated from your chart? I am (will be after 60 years off) a sport flyer so an extra 10 seconds will not matter that much to me.
Thanks,
Bob
Hi Bob,
Actually I did fly some rubber competition models awhile back but my expertise is in things like NOS Gas power free flight models and the old kind of Ignition model engines used in SAM type flying.
Thanks,
Larry
Torque is measured in u it’s of length x weight. Your chart just shows oz. What is the length of arm? Can I assume inches so 55 is oz x inches?
Hi Ivor,
Actually someone else put this on my web for me some time ago. It’s way above my pay grade! HaHa
Thanks,
Larry
It can be labeled in in-oz of torque.