RunRyder RC
 0  Topic Subscribe
WATCH
 1 page 879 views
HelicopterJR Heli Vibe 90/50, Sylphide 90, GSR260 › YS 91 upgrade for Vigor CS
06-06-2004 05:45 AM  13 years agoPost 1
Ralphw

rrKey Veteran

Spring, TX

My Posts: All  Forum  Topic

I just bought a used CS, and I now have an opportunity to pick up a clean very low time YS 91.

What I need to know is, just what changes are required for the YS to work? I plan on using a 10t pinion for the 8.4-1 gear ratio which I understand should work with no mods. What else needs to change (other than blades) and where do I get the parts if they are required??

Thanks for the help!!

Ralph W.
"Life's Short, Fly Fast"

PM  EMAIL  GALLERY  Attn:RR  Quote
06-06-2004 07:13 PM  13 years agoPost 2
mardy

rrNovice

New Hampshire

My Posts: All  Forum  Topic

I'm in the same boat, almost. I just finished upgrading my standard Vigor to CCPM and a YS91. I went with the 8.4 gearing as it was simpler than having to take a fly cutter to the motor mount. You can get the 10T Pinion from HeliProz (JR PN: 960321). It's running with a set of 700mm VBlades (because that's what I had on hand). I just finished setting it up this weekend and took it for a quick spin. All that I can report at this point is that it does fly. The added power from the YS91 is awesome!

PM  EMAIL  GALLERY  Attn:RR  Quote
06-07-2004 05:19 PM  13 years agoPost 3
archangel

rrApprentice

Pasadena, CA - USA

My Posts: All  Forum  Topic

You did not mention this, but it is a REALLY GOOD IDEA to get a governor now that you have a 91. There is A LOT of power there and it is really easy to overspeed the system. No matter how well you set up your pitch/throttle curves, there will always be flight situations where you will "unload" the disk. While this is ok with a .30 size, and acceptible with a well set up .60, with a .90, you will get into trouble fast.

I have two Vigor CSs, both with YS.91 and they are a lot of fun but the power is abundant and can be dangerous if not respected.

Have fun!

PM  EMAIL  GALLERY  Attn:RR  Quote
06-07-2004 09:33 PM  13 years agoPost 4
Ralphw

rrKey Veteran

Spring, TX

My Posts: All  Forum  Topic

Thanks Guys!! I'm assuming from your replies that no additional mods are required to install the YS other than the 10t pinion. I had seen or heard something about a different collet being required, but I can't find anything more on that. As for the governor, thats on my list after I get the motor. I appreciate the help.

Ralph W.
"Life's Short, Fly Fast"

PM  EMAIL  GALLERY  Attn:RR  Quote
06-07-2004 09:47 PM  13 years agoPost 5
mardy

rrNovice

New Hampshire

My Posts: All  Forum  Topic

I used the same collets as was used on the OS .61. The only other thing is that you don't use a washer on the drive shaft.

Archangel, what gear ratio are you running with?

PM  EMAIL  GALLERY  Attn:RR  Quote
06-07-2004 11:20 PM  13 years agoPost 6
archangel

rrApprentice

Pasadena, CA - USA

My Posts: All  Forum  Topic

Hey Mardy,

First, on one of my Vigors I am running a 10T pinion and on the other an 11T. Both have the stock 84T Main Gear. To be completely honest, with the Governors, I can't tell a difference, but I will try over the next couple of weeks to come up with comparisons and do some tests to check climb out, top end, etc.

Second, on the subject of washers and Collets; I am running the original, stock collets and they work good. HOWEVER, In the manual, there is an illustration and note that says to remove the washer when using a YS engine. I had never noticed this note until two weeks ago when I rebuilt one of my ships (it was old and a small landing mishap encouraged me to do a complete overhaul and re-engine).

I was pretty sure that I had the washer in with the old engine, but, after reading the note, I decided to remove it. This left the brass (soft) collet tightened down on the front bearing of the engine (hard and rotating). I figured the JR manual was right so off I went to the field.

I fired up the motor and began hovering. All was well. I even commented that it was hovering really smoothly with no YS Vibration. About 5 min into the hovering (new engine, break-in) the engine stopped and I autoed the two feet to the ground. I figured that I was too lean and the motor overheated.

I let it coon and tried to start it. The whole works was siezed. On the advice of some of the guys at the field, I left it alone until I could get the motor out and see what the problem was.

As it turned out, the 1/16th of an inch or so of brass collet that stuck out the bottom of the fan hub facing the front bearing consumed itself and was now distributed all over the fan shroud. The loss of material brought the fan into contact with the senson for the GV-1 and stopped the whole works.

I went home and quickly took apart my other heli to see if I used a washer. I did and that heli flies great.

I should be getting the parts to repair my ship today and I will be putting the washer in, mostly to protect that soft brass collet.

As a sidenote, there was another stream earlier where they discussed clutch shoe to clutch bell spacing. The aim is to keep the top of the clutch shoe from touching the bell (that's why no washer on the YS engine). I checked and with the washer in place, there is plenty of clearance once everything is tightened down between the shoe and the bell. When looking at it from the outside, the shoe should be flush with the bottom of the bell, not sitting up inside it.

I highly recommend use of somekind of washer between the brass collet and the front bearing, if not the stock one. Even the fan hub (aluminium) is pretty soft to be up against the front bearing without a barrier of somekind.

PM  EMAIL  GALLERY  Attn:RR  Quote
06-08-2004 03:58 PM  13 years agoPost 7
archangel

rrApprentice

Pasadena, CA - USA

My Posts: All  Forum  Topic

One other, minor thing that can be a pain in the a$$ if you are not aware: The lower mainshaft bearing block rearmost bolt holes in the frames have to be elongated by 2-3mm to provide the necessary clearance for the larger pinion gear. Stock, these hole are round and do not provide enough room for the main gear. You will have to loosen all the bolts holding the start shaft and gears and do some general fiddling to reset the gear mesh properly, but elongating those holes helps a lot.

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 879 views
HelicopterJR Heli Vibe 90/50, Sylphide 90, GSR260 › YS 91 upgrade for Vigor CS
 Print TOPIC  Make Suggestion 

 0  Topic Subscribe

Wednesday, December 13 - 11:24 am - Copyright © 2000-2017 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online