SOP with piped planes (probably same for rear mufflers) is to hand carry and store with tail down, or at least flat. You don't want that stuff clogging up the glowplug. I'm running 10/22 GMA in my PA .51, which makes Randy Aero happy. Might be good to read the pinned posts at the top of this forum. Randy has some good info in there. If you'll read it tonight, I'll read it tomorrow.    Steve 

Hi Brett,

It sounds like this is normal, I was worried it was back to the drawing board. Yesterday the air was very heavy and I had to open up the needle about a 1/4 turn and she seemed to use a lot more fuel??? The first run the R's was low and I didn't change the setting about half way thru the flight she acted like she went lean but smoke was just pouring out the end of the pipe. She wants to run at 11,200 and that's it, no more no less. If you try to change her she just throws a fit. Yes I can change things, if I change props, venturie, amount of nitro, pipe length, she will change  but she really just like to run at that rpm and she will give ya a great ride. When I get the different props and glow plugs I ordered from Randy I'll try to change things just cause I want to play. The plane weighs 61 ounces and flys like a Nobler size plane. I'm really enjoying running pipe engines, soon maybe the Brett type Ro Jett will come in and I'll get to start all over again, Yes I'm going to try and follow Brett's set up to the letter.
Gary

Yup, I make a special Landing gear cradle to hang my piped stuff wheels up. Often put a rolled up hunk of paper towel in the rubber pipe deflector to stop the drip mess. Make it big enough to see so that you'll remove it before starting! Stow it flat on the way to the field.

W.