ORIGINAL: JohnBuckner

Tunning to a pinch I beleve originally came from the high performance free flight fellows and migrated to the pylon crowd where it is very common and where I picked it up.

It is an acquired technique that does require some sound interpretation but is not only very accurate but can be accomplished in seconds easily. It is so fast that you can completely needle the high speed in just seconds with no aids such as tacks or need to keep flailing the airplane up in the air blowing dust and stuff on everone in sight. More importantly is so fast that you do not get poor needles that is typical when sitting there overheating the engine in a long drawn out procedure and gunning the engine. It is like CGR said just done simply by running the engine up WOT letting it stabilize and pinch the tank line just for a fraction of a second almost as quickly as you can do it. Its more obvious than all the other methods on which way you need to turn the needle and multiple pinchs and tweeks of the needle can be done in one quick WOT and your done.

It works and I teach it to any in earshot and the fellows I am mentoring. It is the most used method here now and consistancy of the result becomes noticible over time. It is not as effective with four strokes and for them recommend using more convertional techniques.

So for all my fleet that uses two strokes (the majority) I alway make sure that there is easy accessability to the carb feed line even with cowled installation to facultate easy pinching.

John