Waldo,
I have the OS-70 surpass on my Twist and she is one powerful engine. My Surpass is swinging a 13 x 4w and like yours she can be a rocket. I can get unlimited vertical at about 1/2 throttle on. She has about a half dozen flights on her and I am sure will get better as she really gets broken in.

As for the weight, Horizon's specs with a Saito 72 is about 5-6 lbs. with the Saito 72 including the muffler is 16.6 ounces. The OS 70 Surpass with the muffler is 21.2 ounces, so I would think we are closer to 6 lbs. if not a little more. But I agree with you, the way she pulls a couple of more pounds would not hinder that engine at all.

I did have a Saito 80 in the Twist but I took it out to put that back into my Pizazz, as I needed the extra weight in the nose. The Saito 80 is another 4 1/2 ounces heavier than the OS-70. So my Twist actually went on a diet......


Another lousy weekend here in South Jersey. Hopefully the weather on island is better than here.