Propulsion systems - Barton Control Line Speed Forum https://cl-speed.bmfa.uk/community/propulsion-systems Control Line Speed Discussion Board en-GB Thu, 16 Apr 2026 09:20:12 +0000 wpForo 60 Progress? https://cl-speed.bmfa.uk/community/propulsion-systems/progress Thu, 24 Sep 2020 15:59:14 +0000 I'm curious. I'm having a clearout of stuff I will never use, including loads of plans/details of various models etc.

One thing I will no longer need is an excerpt from Model Aviation Dec. 1978, details of a jet model called Super Burp, which held various records, best speed of 211.18mph That was 42 years ago. Am I right? Not a lot seems to have happened in the last 42 years? 211.18mph is of the same order that we seem to be flying today?

]]> Propulsion systems Anonymous 10 https://cl-speed.bmfa.uk/community/propulsion-systems/progress 40 size engines https://cl-speed.bmfa.uk/community/propulsion-systems/40-size-engines Mon, 21 Sep 2020 16:21:59 +0000 Recently JH mentioned that he had a gaggle of 40 size engines to try in some upcoming projects.

"I have a couple of K&B .40's on the way plus I have two K&B DF 7.5cc motors and also 1 Rossi .40 and two OPS 40 pylon engines."

I know the OPS 40 pylon engines very well, in the 80's and early 90's I was an OPS works sponsored pylon race pilot, so know those engines like the back of my hand.

Which version of the OPS engine do you have? the engines up to the late steel front housing sit in a funny place on exhaust timing, they are timed at 170 degrees which is too much for running open face or on a mini pipe, I did run one of these on a mini pipe in F1 pylon at the 86 US Nats at Lake Charles but I struggled to stay on the led lap, where as in F3D I had fast time.

B.

]]> Propulsion systems Barrie Lever https://cl-speed.bmfa.uk/community/propulsion-systems/40-size-engines