Now that I am flying the E-flite Timber people want me to pull their gliders for them, is there a specific length that the tow rope should be? I have watched several videos of people pulling gliders with the Timber, it seems to me a safe distance would be 20 feet. Should this be OK?

https://www.iflytailies.com/aerotowing-tow-line/

An overly short line will make it easier for the glider to get out of position relative to the tug. An overly long line will result in a sudden lurch by the glider when the line goes taught, and this can result in a ground-loop or worse. My advice would be to tend towards a shorter line initially, and then gradually extend it until you find the optimal length. If, early on, the glider pilot is primed to pull-off the instant he gets out of position (typically too high in the tow, where the risk of a "slingshot" effect, pulling the tail of the tug upwards) then it should be safe to commence with shorter lines to start with.

All the preceding is advice regarding full-size gliding rather than RC, but the same principles apply.

Back when I flew full scale sailplanes 40 years ago, the tow lines were almost always 200' long. You can figure out the scale ratio for your plane(s).

Yes, I would also recommend to begin from the shortest length. Then you'll find your best variant. Also may be it depends from the airline policy?

Where did you find these video? I would like to watch them too. Thanks in advance

Outrider, I think it's a good idea

As I know, it should be no longer then 4.5 metres

When you choose tow rope size, you should remember about some factors such as pulling angle,suction, depth, rolling weight vs. stuck weight.

I recommend you choose a rope with a strength 2 to 2.5 times the weight of what you're trying to pull

As far as I know, better to choose a polypropylene rope because it has some advantages. It stored for a long time and it is not afraid of moisture. But as you speak about airplane, then aviation nylon is is inferior in strength. It can withstand heavy loads perfectly.

If to speak about manufacture, I advice you Belavto. This is a Belarusian manufacturer that has been manufacturing towing elements for over 20 years. Most of the items cannot be attributed to budget products, but its quality deserves attention.

I hope I could help you with my advices. But it would be good to talk with professional companies. May be they could recommend you something better

I've never had a deal with tow rope for airplanes. But I know almost all about tow rope for cars.

So, don't forget to share with us how you resolved this issue

You know, I don’t work with gliders but I work in the truck company. I know that you work in this sphere different issues can arise quite often. If I need in the help of high qualified people then I address at towing dublin company. They provide towing services 24 hours a day and I’m always satisfied in the end. Maybe you could address at this company with your issue, and they will find the best solution for you. You can never predict when you might be going to breakdown or you have some issues with your vehicle but it is always important to get a high qualified help. So, I tried to share with you my advices and now you will know what to do when so question arises. I wish you good luck in what you do.