I just got through test running my first YS 61AR engine...This is a NIB engine...It's been a while since I've run one fresh out of the box like this...All went well and she is a good running engine...You can tell she's starting to loosen up a bit...The traditional YS tight spot/clunk @ TDC is beginning to relax, idles smooth @ 1850, transition is great and she'll start with just a back flip of the prop...If you have ever owned any YS engines you know first runs can be a bit of a pain sometimes...So I'm really pleased with the way it's running...

But...I am a little disappointed in the performance...I was "expecting" it to be a little stronger than it appears to be...Maybe I was "expecting" a little too much?? I was kinda hoping these AR's would run like my old used ebay Hanno's...Everything I had read basically eluded to the AR being able to hang right there with the Hanno...This one is kinda "in between" my standard YS 61LS/OS 61RF-P's and the Hanno...Now this is all on the test stand...And it only has one gallon of fuel through it thusfar...But it's pretty apparent at this point it's not gonna keep up...I'm a little surprised...

I suppose it could be that all the Hanno's I have are well broken in?? Maybe the Hanno's are truly a stronger engine?? I'm running my Hanno's on a Bolly pipe...That may account for a little of it right there?? I may swap the Hatori 650 out with a Bolly pipe next run and see how that does...

I'm kinda looking at it like the AR should be a pretty strong performer...It comes with a nice AAC piston and liner from the factory (Kinda looks like some Shadel style porting too)...It's defiantly a lighter set-up than the standard YS LS piston/liner...It's nice looking stuff...

I started out with a 12x12 APC prop and was shooting for mid to high 9's on the RPM's...Won't do it...About 8800-9000 was all I could get...Then I was lucky to see I had a 12x11 laying here and it's running about 10,100 with that...I settled on that prop for break in and after a few tankfuls I saw a little increase to 10,200 or maybe 10,300 peak...The pipe seemed pretty dialed in...So maybe that is it?? I figure I'll wind up with a 12x11.5 prop as she wears in a bit more but don't expect she'll ever turn the 12x12 with Authority like the Hanno does...Both my Hanno's run exactly the same...They will turn the 12x12 @ 10,300...Constant, with Authority, No fluctuation at all...Very Impressive!! I suppose that is what I was "expecting" the AR to do also...I doubt it ever will...It appears it will be a tad bit stronger the the standard YS LS but that is about it...

Which is really fine...And I know I'm probably being a little over critical...But since I have always been such a YS fan...I suppose I'm just a little sad to realize that the Hanno is gonna whip my Prize YS AR's arse...And not break a sweat doing it!!

Oh Well...

Chuck

Chuck, You'll never be happy with that old YS engine. I'll take it off you hands for $50 with the pipe!

Chuck, my advice is to give the engine a bit of running time (at least a gallon's worth) before expecting to see the true potential power that the motor is capable of. My experience with the YS 61 is that a 12 X 12 is the absolute biggest prop it can turn comfortably. I actually prefered a 12 X 11 on those motors.

Not sure how you break your motors in but I always used a slightly smaller prop initially (guessing a 12 X 10) otherwise you run the risk of the motor slugging through the break-in....which might result in the motor not reaching it's potential.....IMHO.

Jeff

It's been a few years so my memory might be "clouded" but I remember running an AR in in my Saphire, I used a Hatori pipe and Mac's header. I remember running a APC 13x10 and it was able to spin it in the low to mid 9's. Engine unloaded a bit and vertical was very good. .

Thanks guys...

I'm off today so I'm in the driveway messing around with it right now...Like I say..It "runs" nice...I know it will be a good engine...It does a little better with the Bolly Pipe...But I think I'll keep the Hatori on there because the difference isn't substantial and I have the Bolly's allocated to the OS's...

I'm gonna work on tuning a little more...

Yeah...I was hoping to run a 12x12 or a 13x10 depending on the Aircraft...I get the feeling it "may" do it...But it's seems pretty clear to me that the Hanno is a stronger engine...Since I've always been a YS guy...It hurts a little...Ya Know...


Have fun...

Chuck

What do you mean by that? (unloaded a bit)

I hear that term a lot at the field, but was to timid to ask.

CGr

OK...Fine...I'm an Impatient Winer... [X(]

Time...That's all it needed...Just a little Time...

My little AR isn't gonna let me down...She's running pretty dang strong now...12x12 @ 10,200 on the stand running rich...

I am Happy!!

Chuck

My memory isn't in the best condition these days, so, with that in mind - didn't the Hanno Special cost about twice as much as the YS .61AR? Seems to me the Hanno damned well better provide more power in order to justify its existence and its price.


Ed Cregger

I can't say for sure either...But I saw somewhere on the world wide web..an old YS price list...If I remember correctly the standard model YS 61LS was about $325 and the AR version was about $520...

Not sure what the Hanno's ran money wise back then??

Have Fun...

Chuck

Can't really speak for cllaurit...But I think he means...The engine will actually turn more RPM's while in the air flying than it will while on the test stand or running the engine up on the ground while holding your plane...

Not sure if this is a good analogy?? But kinda like having your pickup truck chained to a telephone pole and flooring it -vs- the chain breaking with the truck floored...

ahh..Scratch that analogy...Got a better one:

Like having your boat floored but tied to the dock -vs- the rope breaking with the boat still floored... ....Better...Huh...

Oh Well...

Chuck

I mean it gained RPM's when in the air.

I remember the YS .61 selling for around $250 and the Hanno Special for $499.95 from Tower.


Ed Cregger

Hey Ed,
The prices are about right. but the engine was the Hanno Special MK II. The price for the MK II was significantly higher than the MK I while no significant performance advantage was enjoyed by the II over the I. When sales of the MKII dropped (stopped...) the price went down as well. I bought a MKII from Singapore Hobbies a few years ago and paid a whopping $212. The YS .61AR price was already heading down when the new version of the Hanno was released because YS (Mr. Yamada) accurately foresaw the impending demise of the 2-stroke 60 as the pattern powerplant of choice and by that time had released the 1.20AC which was the king of pattern 4-strokes for several years (until the brief lived 1.20SC and the 1.40L arrived).

Hey Chuck,
put your tach away. The YS .61AR is a strong engine [X(]! I've seen too many pattern 60s damaged by pilots wanting an extra 200rpm on the ground. Once airborne, the engine is a bit lean or the pipe a bit too short so the engine runs hotter than optimal. Pattern is about reliability; so run the pipe a little longer and the mixture a little richer and the engine will last for 1,000+ flights . Plus, you are now running an 'antique' - there are no more being made and no more parts available (commercially).
As for the AR, I found the APC 12x11 to work best. The engine likes to 'turn up' a bit more than the Hanno (I think the throat diameter of the carb is a bit larger on the AR). I've run nothing but K&B 1L gloplugs in my pattern engines for more than 30 years. If you're not getting 40-60 flights on a plug with no distortion of the element then the engine is probably too lean or the pipe too short.
Enjoy your AR!!
Will Bartlett

Thanks!!

Yesterday while "Tuning" I shortened the pipe to where the needle started to become "Sensative"...I was getting MAX RPM's of 10,700-10,800 on the 12x11 APC...Then I add .5" back on the header...I like it there because I have a good needle with 4-6 clicks between lean and rich...While I loose 2 or 3 hundred RPM's...It's allot more "comfortable"...Then I'm running her rich to boot...

Now it's just down to getting an Aircraft ready to FLY!!

I am really pleased with the AR now...I will put the Tach down and enjoy...

WaHoo...

Chuck

I try to have the airplane ready to fly before I run the engine... 'flying' the test bench isn't really much fun
Will BArtlett

That AR would be great in an Atlanta!



DM

See...I'm sure to most people that is true...But for me this whole process of dusting off or acquiring these engines I always wanted...Taking them apart and going through them with a fine tooth comb...Running them on the test stand...It's been a Blast...

Of course I do have planes in the works too...I'm enjoying the building process...I'm enjoying this whole experience...

Yes...I do believe this will go well on an Atlanta...

Chuck

Are you running that monster in front of your house? I saw that picture and I was tempted to run up a Rossi I have here. My neighbor is doing an addition... maybe they wont mind.



DM

I am running it in front of my house...The local law enforcement already know there way here...I have a Suzuki RM 250 Motocross Motorcycle that I use to "aerate" my lawn..

I do try and be respectful...I wait till after 10:00am and try to quit by 9:00pm...They are normally short durations...They havn't called the cops about running the engines yet...

I think it's the wheelies on the dirt bike that get me in trouble??

Have Fun...

Chuck

Wheelies... on their lawn or your lawn

I have been know to Overshoot a time or two...

Hi Chuck,

You got a true gem there. I'm a YS guy too. I have a .45 (best in it's class even today) two FR 60s (best short stoke 60s, challenged only by Rossi) and an AR. It has been my experience that YS 2 strokers will reach their full potential only after about 4 or 5 gallons, so just give it a little time.
If the AR isn't as strong as the Hanno, it's only marginal. Where the Hanno is better, is how linear and accurate the throttle is. As for longativity, OS' stupid ABN thing ruins it all. If you want your hanno to last as long as an AR, you better put a Shadel AAC set. Speaking of that, I think your engine has a Shadel kit since (to the best of my knowledge) ARs weren't AAC stock.

BTW my AR is mounted in a Naruke Aurora - SWEET

Ohhh..Ohhh...Aurora!!! That is my absolute #1 Dream Aircraft...Do you have any Photos?? Would love to see them!! So how is the Aurora/YS AR combination?? That is kinda what I had planned for mine too...Aurora Baby!!

I've just acquired the AR's over this past year...I got 2 that were new and one that is well used and has turned out to be a basket case (unless I can happen across a piston/liner)...They all have the AAC set up in them..I think that was one of the differences between the YS 61R Long Stroke and the YS 61R AR versions...I wrote this in another post about the differences I have noticed between the LS and AR engines: http://www.rcuniverse.com/forum/m_6751396/tm.htm

Everything I have read during my research on these guys is the YS AR was basically going head to head with the Hanno "Back in the Day"...It seems to me the OS's were more popular...I have yet to see a person say one bad word about the RF-P's...But the YS's seem to have allot less of a following...I've seen comments that folks didn't like the AR engines and considered them a pain...I think that is pretty typical of YS engines in general even today...I would agree they can require some patience from an individual...The can be finicky that is for sure...But I've learned to only use good fresh fuel and "Don't Touch Anything" has resolved nearly 100% of my problems...Some folks love them and some folks don't..he he

I'm looking forward to it...Seems it's coming around already...I think it will be good!!

Have Fun...

Chuck

Hi Chuck,
This is for you and everybody else who's interested: RPM figures... yippee...
OS Hanno Special MK I --\\---------OS RF ABC-P w/stock liner-----\\-------YS longstroke----------\\----------YS AR
RCM review 10% nitro ---\\-----------%nitro - unknown-------------\\------% nitro unknown--------\\--------25% nitro
11x8 zinger - 12,500----\\---------12x11 apc - 10,800-----------\\------12x10w apc - 10,800--\\--------13x9 apc - 10,500
11x10 zinger - 11,400----\\---------12.5x10 apc - 10,600-----------\\------12x11 apc - 10,600
11x12 apc - 11,000----\\---------12.5x11 apc - 9,900------------\\------12x12 apc - 9,300
12x8 zinger - 11,500----\\---------13x9 apc - 10,300
12x10 zinger - 10,400----\\---------13x10 apc - 9,800
12x10 apc - 11,100
12x12 zinger - 10,300
13x10 zinger - 9,500
14x6 zinger - 11,000
Model Builder review %10 nitro
15x8 graupner - 7,592
13x10.5 mk - 9,066
12x12 apc - 9,592
13x6 mk - 11,268
11x10 apc - 11,263
%nitro unknown
12x11 asano - 11,200
12.5x11 asano - 10,300

The rpm figures NOT from reviews were found in old issues of the K-Factor
NOT a complete list. It would be nice to have had each engine tested with the same nitro/prop combination.
One of these days... I'd like to fly the same airplane with a Hanno and an AR (same prop and nitro), probably not any significant difference!

-Will Bartlett

Very Awesome Will!!! Thank You Very Much!!!

Chuck