If TD .020's are anywhere as touchy on needle settings as Pee Wees can be at times (usually improved if perhaps not eliminated with the old trick of silicone tubing on the needle to seal air leaks), I could see plug life being a roller coaster ride. I've owned several Pee Wees and generally I find TD .010's easier to start and needle. I've never owned a TD .020, though some years back I started and flew a buddy's many times (on was it a Micro Star? A small parasol wing thing on infernally unreliable Cannon micro gear.. Pilot kit maybe?). As I recall it was a pretty sweet engine to run as long as it was treated it well and in accordance with the golden rule of small engines, keep it clean and feed it good quality clean fuel. Oh yeah, and if you have an adjustable glow panel, take care to set it at minimum and work up to a nice glow setting by watching a plug outside of the engine and out of the sun or bright light. They're expensive little buggers to burn out. And if you disassemble a Pee Wee, be really careful how much you torque the backplate bolts. Sausage fingers on screwdrivers can crack the hub in the backplate, and good luck fixing that leak. That one grounded my .020's more than once at a young age due to a lack of sense for small fastener torque.
Something tells me 3" pitch just may be too much for the engine, or at least at a useful prop diameter that lets you get it up to peak power if you want to boogie along. But I could be all wet, it's just a gut feel. I tend towards the 2-1/2" to maybe 2-3/4" range. 23k at 2.5" = pitch speed approx. 57mph, 2.75" 63mph, neither of which ain't slow for an .020. The combat props come in a variety of pitches around those numbers.
But whatever - it will be fun and hopefully not frustrating experimenting with the limited choices.
I saw one fly in a small low wing thing with ailerons. It used a small balloon tank immediately behind the firewall, and seemed to run steadily enough through maneuvers.
Last edited by MJD; 11-23-2013 at 10:35 PM.