Hi folks,
I was a pretty active combat flyer in the 80’s & 90’s, but work and family took me away from it until recently. Now retired, I’m trying to climb back into it, starting with speed limit. It’s going pretty well. I have several OS 25 FP’s which run really well, until about the last half ounce or so in the bladder, when the pressure increase causes a rich run for the last few laps.
This is not a new problem. We had to deal with it in fast combat, but with the 36’s it only seemed to last a couple laps, plus by that point I had usually killed or been killed. With these speed limit engines it seems to last about 10 laps, and those can be important laps when flying for cuts only.
I think Norm McFadden designed and used a pressure regulator that fit inside the back cover cavity of a Mk III which solved the problem. Does anyone have details of that design? Are there other solutions? I understand one solution is to carry enough fuel to run 5 minutes. Unfortunately, the bladder tube on some of my planes is a bit too short for that.
Suggestions?
Thanks,
Mike