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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › Setting up a YS61ST2
02-16-2003 07:46 PM  15 years agoPost 1
G.Man

rrProfessor

Bristol

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Okay, today I finally had enough of my tired OS61 and as it lost power at 20 feet and I had to virtually auto it in, i decided today was its last flight...

I found a quality replacement in the YS61ST2 which just looked too darn sexy for me to resist...

Anyway, to cut a long story short, I installed it without a hitch and fueled it up with some CP30 and it sprang into life almost instantly....

Took it into the hover and it already gave me a good increase in head speed but the smoke!!!!!

I am sure it is running rich and it is running on virtually stock settings except for a little increase on the low runner (it was a little too lean)...

It gave a pretty solid hover for most of the tank full, but started to get a little boggy towards the end... is this likely to be coz its too rich?

I am probably gonna get someone experienced to set it up for me but anything I should watch for with this engine, as it seems to re-write the rule book in terms of design for the fueling...

My first impressions were WOW!!!! what a sweet engine, but I was not used to such a smoke trail with my OS and WC15...

Any experienced YS users out there?

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02-16-2003 08:42 PM  15 years agoPost 2
Chris Hinds

rrApprentice

Loughborough, Leicestershire, England

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Galifrey,

Yeah CP30 + YS = SMOKE!

Well actually CP30 + anything means lots of smoke, even a TT36 can happily out smoke a cruise missile.

As to tuning the YS it should tune more or less the same as the 3 needle OS. Be aware that they don't like running lean on the top so keep the main jet on the fatter side.

By nature of the fuel system it should stay consistent from full to empty so if it is bogging it suggests that the diaphragm may be a little stiff (has the engine been in storage?) or there may be a little gunk in the check valve. YS engines have to have a virgin clean fuel system, but once set up you'll love it forever.

Ordering a YS91 soon... haven't got a heli for it but I want one

Chris

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02-16-2003 09:35 PM  15 years agoPost 3
Dr.Ben

rrMaster

Richmond, VA, USA

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Idle: About flush with the barrel.

Hover: 1 1/4 - 1 1/2 turns open

High speed: 1 ish open. Maybe a little more or less depending on the weather and moon phase.

Idle: Set up is whatever gives a nice idle. Nothing fancy.

Hover: Get this roughed in first. Keep leaning it until the mixuture gets ratty, then back off at least a few clicks. The YS is smoothest in hover if the hover needle is as lean as SAFELY reasonable. THE HOVER NEEDLE DOES AFFECT THE HIGH SPEED MIXTURE. Never forget this point.

High speed: Sensitive needle. Tweak a few clicks at a time until the engine holds a nice clean song at WOT. Don't overdo it. You'll want the smoke trail.

Fine tuning: Engage idle up from stable hover and listen for how smoothly the engine transitions. If it doesn't spin up cleanly, lean the hover needle a tiny bit. When in FF, come out of the throttle a bit from WOT. If the engine goes a bit rich, lean the high speed a click or two more. The engine should stay pretty clean down to about 2/3 throttle, when the midrange richness comes in a little by design.


Ben Minor

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02-16-2003 10:59 PM  15 years agoPost 4
G.Man

rrProfessor

Bristol

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thanks guys, will give it a go

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