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90 in X-Cell 60 Pro Graphite?

NewHeli

Key Veteran

Pittsburgh, Pennsylvania, USA

Hey guys.

It's going to be a while before I do this, but has anyone ever put a 90 engine in their X-Cell 60? I have pics in my gallery if you don't know what heli I mean.

In order to do this I know that you need longer blades/tail boom and a gear change--but what are the stock numbers for all of this?

Thinking about the OS 91 C-Spec w/ pump--good engine? What muffler?

Thanks,
NewHeli

Nathaniel Rice
Team HeliWholesaler/Miniature Aircraft
Team YS Engines

03-06-2005 Over year old.
GM1

Elite Veteran

Tallahassee, Florida US

Yup

Dennis Purduski has done this exact change and has been competing with it for a full year with good results. If he is not registered here, you can contact him through the competition heli list or email me and I will forward to him.
Gordie

On a dog sled team, if you're not the lead dog, the view never changes.

03-06-2005 Over year old.
NewHeli

Key Veteran

Pittsburgh, Pennsylvania, USA

I don't know what "list" you mean. Also I don't know his RR sn, so maybe you could just forward it to him?

Thanks,
NewHeli

Nathaniel Rice
Team HeliWholesaler/Miniature Aircraft
Team YS Engines

03-07-2005 Over year old.
GM1

Elite Veteran

Tallahassee, Florida US

Hmmm

The Yahoo "Competition heli list" at Yahoo groups. If you want me to forward, send me an email so I have your addy to forward.
Gordie

On a dog sled team, if you're not the lead dog, the view never changes.

03-07-2005 Over year old.
junkpilot

Veteran

Alamogordo N.M.

90 into 60

My everyday ship is an excell 60 Graphite with pro 2 head swinging SAB 710s tail boom is 33 inch with 105mm tail blades.
I'm not sure how it compares to to newer ships but mine flys just fine!
Junkpilot

When you fly JUNK it's hard to tell when you've crashed!

03-07-2005 Over year old.
NewHeli

Key Veteran

Pittsburgh, Pennsylvania, USA

All right I'll check it out. Get back to you on that...

NewHeli

Nathaniel Rice
Team HeliWholesaler/Miniature Aircraft
Team YS Engines

03-07-2005 Over year old.
GM1

Elite Veteran

Tallahassee, Florida US

Pro IIKs

I'm running YS 91s in my Pro IIK-Ts with a 7.9:1 gear ratio (12 tooth pinion and 95 tooth main gear) with a 33 in tail boom. I'm currently running 720mm blades with 105 mm TR blades. Model has great performance but requires some care when setting up the clutch assembly as the motor is so torquey that it can overpower the clutch. The fix for that is simple, run the 4 stroke clutch from the old Minair kit. Works great and does not slip at all. The problem with the 4 stroke clutch assembly is that it is a bolt on style clutch, not a uniball self aligning clutch so it requires a little care in building and aligning. Once installed and aligned, it is bulletproof. I have one model with the stock clutch and one with the 4 stroke clutch and both seem to work fine for me.
Gordie

On a dog sled team, if you're not the lead dog, the view never changes.

03-07-2005 Over year old.
NewHeli

Key Veteran

Pittsburgh, Pennsylvania, USA

This Xcell originally had a clutch with 2 pins in on the bottom for alignment, but the one it has now is a bolt on one (with 2 holes for screws into fan). Is this what you mean? I'm not sure what my current gear ratio is, but it's running a YS 61ST2.

NewHeli

Nathaniel Rice
Team HeliWholesaler/Miniature Aircraft
Team YS Engines

03-07-2005 Over year old.
GM1

Elite Veteran

Tallahassee, Florida US

Gear ratio

The normal gear ratio for a YS 61ST2 was 9.3:1, that is a 93 tooth main gear and a 10 tooth pinion. If this is an older model, then the main gear is black and has the TR crown gear molded in. There is a new system that has separate gears which are white machined delrin and a constant drive for the TR, definitely an improvement on the older slipper drive.
As for the clutch, the older stock size clutch that bolted on hasn't been around since around 1995, having been replaced ith the uniball clutch which has two pins stickin out and a plastic ball arrngement in the middle. The 4 stroke clutch is a much larger affair using a completely different clutch bell. As I stated, it is a bolt on and does require dial indicating and careful adjustment but works extremely well when you get it right.
Both the Pro and SE were great flying models with mCCPM but neither is now in production although both are still being supported with parts, a big plus for those of us that prefer mCCPM. I hope to keep both my ProIIK-Ts flying for the next few years until I find a better FAI model.
Gordie

On a dog sled team, if you're not the lead dog, the view never changes.

03-08-2005 Over year old.
NewHeli

Key Veteran

Pittsburgh, Pennsylvania, USA

Check out my gallery. The picture might help you identify what all is in my ship. I'll look up the gear ratio. Mine uses the slipper drive for the tail, which works very well.

NewHeli

Nathaniel Rice
Team HeliWholesaler/Miniature Aircraft
Team YS Engines

03-08-2005 Over year old.
GM1

Elite Veteran

Tallahassee, Florida US

AHA!

Model looks like an early #1004 graphite, not a Pro, which later became the SE when they added a new carbon fiber front tray . I would bet this model has a 9.5:1 gear ratio (95 main/10 pinion) You can still put a 91 in it but it would require a clutch bell with 12 tooth pinion, some motor shims, a larger volume 91 size muffler, longer tail boom and tube drive (33 inch) longer blades, 700-710mm, and longer TR blades 100-105mm.
Gordie

On a dog sled team, if you're not the lead dog, the view never changes.

03-08-2005 Over year old.
NewHeli

Key Veteran

Pittsburgh, Pennsylvania, USA

Looked up the ratio on my governor, its 9.00 : 1

Thing I don't get is why does a 91 need blades that are only 20mm longer? What's the point? I think the blades on it now, for the 60, are 690s.

NewHeli

Nathaniel Rice
Team HeliWholesaler/Miniature Aircraft
Team YS Engines

03-08-2005 Over year old.
NewHeli

Key Veteran

Pittsburgh, Pennsylvania, USA

Got in touch with Dennis, he gave me some part #s. I should be in good shape when it comes time for the upgrade... Hehehe...more power!!!

NewHeli

Nathaniel Rice
Team HeliWholesaler/Miniature Aircraft
Team YS Engines

03-11-2005 Over year old.
kjkelly

Heliman

Austin, TX

Another SE changing to YS91 power but....

I have read Gordie and DavidH both posting about needing shims to change an SE from 61 to 91 (YS in this case) power. Since the motor clearly needs to move FORWARD I cannot see how the shims function? Shimming between the motor mount and the motor only serves to move the motor REARWARD. The only solution I can see is to drill out the sideframes.

What am I missing?

"Great ideas will always encounter violent opposition from mediocre minds"
Einstein

09-04-2006 Over year old.
KCT

Veteran

Ontario, Canada

kjkelly,

I converted mine some time ago to YS80 with 8.45 ratio. I machined about
1mm off the face of the engine mount to space pinion/clutch correctly
and have it ligned up with the engine.

Cheers

Kay


That's not flying, that's crashing with style...

TeamBob00, WildCat, Helitron,

09-04-2006 Over year old.
HOMEPAGE  
NewHeli

Key Veteran

Pittsburgh, Pennsylvania, USA

Maybe you need a different motor mount all together. When I talked to Dennis long ago he gave me the part number for the "correct" engine mount. I think mine might already have it but I will look it up for you. By the way, I think Dennis' email has changed. I tryed to contact him but my email was rejected. Anyone know how to contact him?

Nathaniel

Nathaniel Rice
Team HeliWholesaler/Miniature Aircraft
Team YS Engines

09-04-2006 Over year old.
kjkelly

Heliman

Austin, TX

That engine mount is no longer available

Thanks Nathaniel,

DavidH had suggested the same, but I can't get it. How did you machine the motor mount? If it can be done with a dremel, then I'm up for it. Otherwise, I don't have access to any milling equipment.

Any heartache about widening the slots in the sideframes slightly?????

"Great ideas will always encounter violent opposition from mediocre minds"
Einstein

09-04-2006 Over year old.
KCT

Veteran

Ontario, Canada

kjkelly,

I machined it off on a lathe with milling attachment. Not really the
way to do it but it worked ok for me. I don't think it can be done with
a dremel, the results would not be satisfactory.
Modifying the engine mount is sifficient, no need to modify the lower
frames at all. Check out the CAD forum there are some folks that do
machining for a living, perhaps a fellow would help you out with the
milling job.

Cheers

Kay


That's not flying, that's crashing with style...

TeamBob00, WildCat, Helitron,

09-04-2006 Over year old.
HOMEPAGE  
New Jedi

Heliman

Chicago

Hi guys...
can i just put ys90 in without changing anything? such as gear ratio, longer tail...etc...

Just pure drop my ys61 off and then put ys90 in instead...can i do just that!

freedom flying

09-05-2006 Over year old.
KCT

Veteran

Ontario, Canada

New Jedi,

no not relly, you need to adjust the gear ratio form 9:1 to 8.45:1,
otherwise your 90 engine is not going to be happy and operating on
the sweet spot.

Cheers

Kay


That's not flying, that's crashing with style...

TeamBob00, WildCat, Helitron,

09-05-2006 Over year old.
HOMEPAGE  
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90 in X-Cell 60 Pro Graphite?

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