Akofly,
Very Nice Work!
I have only got my models to really fly in these past 2 weeks. The Guillow's Rubber I was using I believe is "Worn out and Tired" It is visibily strech damaged and I do not want to use those motors again for fear that they will break. I bought SIG in 3/16 width, along with the SIG rubber lube. So if you are following my Bf 109 F build I will be using lubricated SIG rubber in that... We will learn together.

I also plan on using a thrust washer and propeller bearing, which I also have never used before...
Cheers, Mitch