ORIGINAL: mk1spitfire
Your engine will be alot free'er after 1st run in. The pinch is tight on 50v1 and 36v1,so i assume the same for 52. Its another debate on how to run it in but basically the quicker the engine can get up to to temperature then the pinch will be less due to expansion and things won't wear out, but bed in! I'm sure instructions will say run rich for 1st tank, or more like 4stroke sound tuning,but its not a ringed engine.
Ohters here can give more tech advice.
What fuel you going to use? Prosynth 10%? Weston say use that because they sell it and thats part of the warranty. My only comment on that is the unknown oil content they refuse to disclose.
I've used it for a season but im convinced the low oil wears things out quicker but performance is good as there is more methonol to burn instead of oil.
I've switched to another synth called propower 18% oil or may try techpower 15% both by model technics. Pro sythn cheaper though.
Watch out for flooding, be prepared to take plug out and turn her over to spit fuel from glow plug hole.
pp7 plug? sometimes 2v gives a better glow for starting.
Your know when its tuned right because it sounds angry. It might pay to get someone to launch it for for first flight until trimmed but after that its very simple to launch. I've found a THIN rubber glove very useful to launch to give grip. 9x7 it will fly out your hand likewise 9x6, with gentle push 45 degrees, watch out for torque to left.
I`m gonna be using coolpower 10, which has 18% oil.
As for runing in, i was gonna set the needle for pretty much peak power and maybe back off a 1/4 of a turn something like that, and run it for two minutes or so and then stop it and let it cool down, and just do that untill a couple of tanks are through it ?
I have a 9x6, 9x7, 8x8 and 8x10 props for it, i`m leaning towards the 9x6 for the first runs and flights, but the information supplied between the instructions with the aeroplane and their website is a bit confusing.
On the kit instructions they say for maximum speed the aircraft is capable of you need to shorten the pipe/manifold and use the 8x8, but the website says leave the pipe the standard lenth and use the 8x10 ?
But they stress not to use any other prop than the 8x8 if you shorten the pipe/manifold !
I`ve read stories about the conrod blowing on them, but i`m hoping to avoid that sort of thing by warming the head up before the first runs.