Found Collection

If anyone is interested, The YS 61 ST engine is the greatest engine ever
made for 60 size RC Helis!!  I had a OS61SX-WC in my Ergo and it was giving
me major problems when I was doing any inverted hovering and the main tank
dropped to 1/4 full.  Not to mention the fact that it never ran smoth and i
would allways notice some hammering from the engine.  I then replaced it
with the new YS and i cannot be happier.  It has unbelivable power, is
increadably smooth and will never run different (rich or lean) when inverted
due to the pressurized fuel system.  I think that anyone buying a new engine
for there heli or considering an upgrade should buy the YS 61 ST right away.
it is the greatest engine ever.

PS.. I broke the engine in in the heli and was doing 3D after two tanks.

Glad to hear it... Does yours have the 3 stage carb?

I don't fly one myself, but there are a few guys here who have them.
While you are right that they seem to produce great power, the guys
here have been having some problems with reliability with them.  Also,
from what I hear, they are a bit finicky in terms of carb
settings/nitro %.  Have you seen any problems like this?

Chris

On Thu, 14 May 1998 11:09:31 -0700, "thomas noto"

There are a couple of things you need to do though.

1  As walter said, you need to change the gearing to lower RPM's.  I did
this in my Ergo by changing to the 10 tooth Pinion Gear, as the engine likes
to run at lower RPM's but will produce considerably more speed and power.
2 You need to run this engin on nothing but 30%.  Cool Power or Power Master
seems to be the best but i am sure Wildcat 30% will work as well.
3 Only a Hatori Muffler can be used on this engine.  The 666 or 669 have
been found to be the best.
4 Only a Enya #3 or a OS #8 will give best performance.

I have been using this combination in both my YS Engine/ Heli combination
and have not had any prolems with reliability at all.  Also, you need to
make sure you filter the fuel going into the carb and your fuel tubing is
properly setup.  10 CM from pressure fitting on back of engine to check
valve.  I hope this works for all of you.  It did for me.

Beav

--
E-mail me (if you want to) at
Beavis AT nachos dot Demon dot co dot uk

http://www.nachos.demon.co.uk

I've had a YS 61 for about a year now and have found it to be trouble free. It
did take a while (several gallons) to break in but I never change the needles.
I run it in a Futura and had to change to gearing to run it at a lower rpm. I
just switched to 30% Wildcat and am in the process of resetting the pitch
curves.  It is smooth, consistenet from tank to tank and has more than enough
power.

Thanks for the info Walter...
What fuel were you using before the 30% Wildcat?

I am running a YS in my ERGO 60 with a Hatori muffler with very good results.
While the power is good I have been considering going to a tuned pipe.

There was a review of the YS in Rotory Modeler (March/April 98) that tested this
engine:

1. Without an exhaust system
2. Hattori muffler
3  MA nitro pipe

There comment on the MA pipe was: "Clearly, this is the piece of equipment to
use if maximum power is sought, though equally obvious is the trade off between
power and sheer flexability.......".

While the Hatori is probably the most popular combination, it is certainly not
the only one.

Paul

P.S. Did anyone notice that this article is a copy of the one from Model
Helicopter World (June 97)?

Paul,

 It was definetly a poor choice of words on my end when i said "ONLY" a
Hatori Muffler can be used.  Really what I should of said is that Every heli
Flyer that I have had the privlidge to talk to about this engine, including
Dwight Shilling and Ray St. Onge have said that the Hatori gives the best
Performance/Smoothness and Quietness out of all other combinations.  Even YS
themselfes have said that they only recomend ussing the Hatori with this
engine.  If you would like to experiment with other types of setups then I
think that is great.  Myself, I think I will stick with wat is proven and
spend more time in the air than on the ground.
Tom

Tom,
Just flew with the MA nitro pipe/YS combination last night. After getting the
mixture and pitch curves set back up (2 tanks), I flew 3 more tanks. Although
the tuning is more sensitive, I had no problems and the power is up quite a bit
(~10% if you believe the article).
Paul

I haven't caught this trick on the newgroup before so if it's been mentioned,
please excuse my echo.  I've heard that if you remove one of the head shim
(there should be 2) on the YS, you can get a nice boost in power.  My flying
buddy did this on his machine and was very pleased with the results on 30%.
I'm rebuilding a second machine and have done this to my YS.  I'll let you know
what the results are on 15%.

Fly Safe,
Steve

Steve,
Good information. I am not sure why I am not having problems with my setup, but
right now things are running great. Currently using Enya #3 glow plug and 30% Cool
power fuel.
Paul

I don't know either.  Maybe your engine is set a little fatter on the idle side
from the factory than mine is.  All I know is, there is no way I'd live with
the idle and transition problems my engine demonstrated with the MA nitro pipe.
 I feel fairly confident that if I could have richened the low end, it would
have done much better.  I've always run 15% (Enya #3 or #4) because I don't
want to PAY for 30% but I've always been happy with it's performance.  My
friend, Mike, was able to pull another couple of degrees of collective on the
top end by removing one of the head shims.  I'm curious to see what the
performance does with 15%

I'll let you know!
Steve

Steve,
I just checked my YS and only have one shim. Also my manual only shows it having
one shim.
I wonder how many "versions" of this engine there are???
Paul

can 10%fuel be used instead of 30% in this eng? Rich

Scott,
What fuel, glow plug and exhaust are you using?
Paul