Yes lovely to fly enjoyed again today but not yesterday, so here goes and some useful info hopefully:
Well, played around with the tuning and could not get back to where I was on Saturday which was odd, I had loads of advice, lean main, mid, idle blah blah, a few gentle flights but bogged like hell in loops and slight temp increase.
Got home and thought, needles way out of recommended, stop, re-evaluate and think, at least RTFM again.
Something clicked when the manual mentioned tuning the HOVER NEEDLE FIRST!
Why was that I thought, then found this on the web:
http://rc.runryder.com/helicopter/t445879p1/So why is this different from OS, surely the main needle controls fuel overall, NOT on a YS is doesn't I took the small fuel pipe link off the engine and put a spare piece onto the carb and blew whilst playing with the needle valves and throttle barrel position. The high needle did actually nothing until the barrel gets close to full throttle. The mid was nice and linear until it got near the top end where the high takes over, I had the high set so hardly any fuel was getting in.
Took the exhaust off and checked, all was well, slight coco brown but parts still shiny with a black ring so no harm done, probably cos I had not had it on full bore for more than a few secs! Lesson learned and telemetry probably saved me here.
So think of it like this, an OS carb has the high feeding the Mid, like it is in series ref the fuel flow, the YS has fuel available in parallel to both needles, simples heh. Looking at the throttle barrel outside it has CNC tracks to allow the fuel into the venturi, again seperate.
So today, went back to factory settings, tuned the mid until the boom wasn't twitching so much, then some big loops and leaned the high a bit. Temperature stayed fairly constant around 100 Deg C and LOTS OF POWER
Main is just over a turn and mid at 1.25, much better.
Great, nearly there but governor stopped working, head speed close to 2000 RPM, requested was 1800.
Moved the sensor about but no good. Went back to VBar governor from Aerospire multigov, thats working but twitching back, must be gain settings or something. Then someone mentioned that for YS change the Minimum Gov% from -50% to -20%. Now what this does is limits the lowest servo position that the throttle may go, its in the negative sector, so -50% is lower throttle than -20%.
Tried this, then crazy headspeed again, aha it twigged that the YS throttle needs to get lower to reduce the HS!
So -40% was the limit where the governor could take the throttle low enough. My multigov was set to 30%, betting that this was why the governor lower speeds were not obtainable.
So now I have great flying heli, only one issue, it burbles a bit at 1800 HS when I come off the pitch(also hangs a bit in hold), probably rich on the mid, but may just leave it for a few more tanks and enjoy the flying.
So any experienced YS users have this and maybe the hover mark on the carb has significance here?
My throttle position is -20% to get to that mark!
