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HelicopterMiniature Aircraft Whiplash & Fury 55 › Pro2k YS 60 to 90 upgrade
06-01-2004 04:17 AM  13 years agoPost 1
Greg Faust

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Northern VA, USA

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I'm getting ready to wedge a YS 91 in my Pro2k that's currently flying with a YS 61. Has anyone done this? I'm currently flying 680 mains with a 9.3 gear ratio. I'm thinking somewhere around 8.45 with the same blade size or 8.36 with 710 blades. I'm sure the latter will work, but I'd rather do the former and maintain the agility of the shorter blades as long as I don't overspeed. I plan on running a Performance Specialites muffler and Mavrikk Pro Carbon blades regardless of which size. All feedback would be much appreciated, even if it's not a pro2k.... similar engine/blade setups on furys appreciated too. I've already searched runryder and I don't see people running super high headspeeds with taller gear ratios, but I've already put the 20 gram paddles on the pro2k and I want more cyclic and more power so the headspeed has to go up!!! AFTER SELLING MY TEMPEST 3D/YS91/710mm I NEED MORE POWER!!!

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06-01-2004 01:49 PM  13 years agoPost 2
ornatep

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San LUis Obispo, CA USA

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Should have kept the Tempest if your looking for the power and 3Dability but 8.45 is the ratio you want for the ys and your main shaft would appreciate a third bearing on it, good luck

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06-01-2004 02:57 PM  13 years agoPost 3
GM1

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Tallahassee, Florida US

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Done it

I am currently flying a Pro IIK-T with YS 91 in FAI. I am using the 7.75:1 ratio which uses a 12 tooth pinion and requires a little care to clear the fan shroud as the motor is moved forward quite a bit. With the 8.45 or 8.36 ratio using the 11 tooth pinion, about all that will be required is some motor shims and the new pinion. The muffler will move forward just a fuzz so you might have to trim the canopy, depending on your current clearance.
As far as control power, the white 3D paddles work OK if a bit "pitchy" but I'd suggest trying either the 20 gram SAB carbon paddles or the Funtech 3D paddles. They give great control response but are very predictable and have a very linear feel.
Let me know if you need any more info.
Gordie

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

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06-01-2004 05:55 PM  13 years agoPost 4
Greg Faust

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Northern VA, USA

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Gordie, what size blades are you running?

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06-01-2004 06:31 PM  13 years agoPost 5
GM1

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Tallahassee, Florida US

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Blades

Currently I'm running the RotorTech Symmetrical 720s and High Products TZ 91 IIS at 700 mm, both around 195 gr. With the NATS coming up, I'll probably stay with those until after July then make a final decision before the Team Trials.
Gordie

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

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06-01-2004 09:59 PM  13 years agoPost 6
Linley

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Rockville Centre - LongIsland, New York

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Pro II K is a very good machine

Had my Pro IIk for 6 years now and still think its one of the best helis out there. I also have a new tempest with an o.s 91 and its also a great heli but for now I prefer the Pro II K. Don't get me wrong, the tempest is really great - guess I need to get used to ut because its pretty powerful, but if my Pro IIk had the same engine (O.S 91) sure bet it would be an even better.


Pro II K is equipped with a modified O.S. 61WC AAC Performance Specialties piston/sleeve - Zimmerman Nitro Pipe, GY601, JR digital servos and Futaba 9Z. GP-4 700 Carbon Blades

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06-01-2004 10:01 PM  13 years agoPost 7
Nick Farmer

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Worcester, England

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I've just got my first X Cell pro 2 K and it has a YS 61 which is proving a dificult to set up. I've got a Freya with an OS 90 which you just leave and its great all day.

How often do you have to change set up the YS 6

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06-01-2004 10:01 PM  13 years agoPost 8
Nick Farmer

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Worcester, England

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I've just got my first X Cell pro 2 K and it has a YS 61 which is proving a dificult to set up. I've got a Freya with an OS 90 which you just leave and its great all day.

How often do you have to change set up the YS 61 is it the same as the OS engines in this way??

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06-01-2004 10:15 PM  13 years agoPost 9
GM1

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Tallahassee, Florida US

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Hmmmmm...............................

I ran a YS 61ST2 for three years in a Pro IIK. I think I reset the motor twice in all that time. It was pretty much set and forget unless the temp changed 20+ degrees F, then you changed the midrange needle about 2-3 clicks. A YS sets differently than an OS. The main needle on a YS is the midrange which affects tuning from approximately 20% to 80% throttle. The other needle is a high speed trimmer which affects high speed 70% and up only. If the midrange is wrong, the high speed is automatically wrong so make sure the model is dead smooth in hover before blasting off into full throttle to adjust the high speed. The little needle in the end of the throttle barrel is the idle adjustment. Set that so the model transitions form idle to midrange smoothly.
Gordie

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

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06-02-2004 04:43 AM  13 years agoPost 10
Greg Faust

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Northern VA, USA

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Thanks for all the help guys. I don't care about pitchy but I do care about rolls/sec. Gladerman has seen me not only mow the weeds, but sculpt the weeds. I miss the unlimited power. I've setup enough helis and helped others ehough to know my machine is tuned to perfection. Even though I don't have the power of the 90 i'm working on that. I'm used to flying 50s in my 30s and 90s in my 60s plus I'm in engineering school where they tell you to figure out what you need and then double it for safety (that ususally doesn't include power, but in this case I'll fudge it). Gladerman, next time it's inverted sculpting when I'm not rusty from a 3 month hiatus. Dr. Ben, thanks for the PM but I already have the PS pipe and even though it has a definite peak which must be tuned to, it's one of the few pipes that will draw the extra power from the YS without the untunable charastics of a fully tuned pipe. the blades and gear ratio are still up for grabs, but I think I'll start by sending the clutch in for a new lining and add a tooth to the pinion at the same time. As for blades, the mavrikk carbons are awesome in the 600 size (as proven on my EVO 50), but not stiff enough in the 680 size to deal with a .90 so I think I'll go with some Mavrikk Pro Carbon 700s. Maybe gladerman will let me give his a try if they'll work with a 4mm bolt.

The pro2k is unreal. I might upgrade the collective servo at some point, but not until I have more power. My end goal is to have the ultimate mechanical mix machine. I love the collective response of eCCPM, but mCCPM will eventually dominate unless linear, not rotary, servos are released by the major manufacturers and can out perform a rotoary servo.... or a radio program is written to make a rotary servo with a ball at a specified radius from the center behave like a linear servo. Both are possible. I'll write the program if Futaba will give me a job. If JR gives me a job first I'll have to think about it.

Have you ever thought about writing the code that runs a governor? What if instead of gradually increasing power as needed you spike the power all the way up and then back off as needed? Just a thought, maybe someday a governor will respond faster, not slower, than a curve.

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06-02-2004 05:44 AM  13 years agoPost 11
SkyfoxSXer

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Gainseville,VA

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Hey Greg,

I'll have my YS91 equipped Pro 2K at the MHA funfly this weekend. I put the maiden flight on it today, about four tanks of lazy forward flight to break in the engine. I'm using the TG Contest 700 blades for now but will most likely switch them out for a set of MAH 700's that I got laying around. The plan was to use this machine as an FAI machine but it is just begging to be flipped over. I'm using the 7.75 gear ratio which probably isn't ideal for high load 3D flying but I just love the way it sounds, so quiet.

Any of you guys running 91's in your Pro notice the clutch bell getting really hot? What can be causing this? It doesn't sound like it is slipping at all. This is a brand new clutch and bell.

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HelicopterMiniature Aircraft Whiplash & Fury 55 › Pro2k YS 60 to 90 upgrade
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