Rubber Motors

[jmper29]

1. Is there a way to get more winds out of your motor besides using lubricant?
2. The rules do not specify a limit to the length of the motor. Is this a mistake? If not, wouldn't this allow for unreasonably large flight times?

[bjt4888]

1. Is there a way to get more winds out of your motor besides using lubricant?
2. The rules do not specify a limit to the length of the motor. Is this a mistake? If not, wouldn't this allow for unreasonably large flight times?

Read this and watch the rubber winding video. https://www.freeflight.org/wp-content/u ... 9-5-24.pdf


The links for this resource and others are in the first topic of this Heli forum.

Once you’ve fed and watched, ask questions if you don’t understand.

Brian T

[bjt4888]

"read" not "fed"

Oops

[jmper29]

The download link for the rubber motor calculator does not work.

[jmper29]

Additionally, what is a "backoff turn?" Thank you for all the help!

[nulluser]

So, when you are winding, since a rubber band has hysteresis, you want to wind to more than the target and then unwind to the target. So if I want say 600 turns, I would go to 700 and then backoff 100. The calculator works for me, try using a different browser.

[bjt4888]

The download link for the rubber motor calculator does not work.

If you have an apple device, you need to download Google sheets too. The calculator is an excel spreadsheet

Brian T

[bjt4888]

Additionally, what is a "backoff turn?" Thank you for all the help!

If you watch the winding video, you'll see me doing back off turns

Brian T

[jmper29]

Hi again! I tried the stepping back method on my 18' 20g lubricated rubber motor and after 4 feet (before winding), it snapped. It seems I can get a maximum of 45 turns on a 15 winder on a band with these specifications (length selected based on turns remaining) resulting in a time of 1:11. Do you (or anyone else) have any further recommendations on how to increase the number of turns or in general increase the flight time?

[bjt4888]

Hi again! I tried the stepping back method on my 18' 20g lubricated rubber motor and after 4 feet (before winding), it snapped. It seems I can get a maximum of 45 turns on a 15 winder on a band with these specifications (length selected based on turns remaining) resulting in a time of 1:11. Do you (or anyone else) have any further recommendations on how to increase the number of turns or in general increase the flight time?

Rubber break at low stress can only be due to a knot tying issue or a very rare flaw in the rubber. Have you read all the resource docs and watched all the videos. If you supply rubber winding and heli details, we can give very specific help.good job asking questions!

Brian T