RunRyder - Anybody tried the hard o-rings in the Jetcopter head??

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Got Jet Fuel? Turbine Helicopters > Anybody tried the hard o-rings in the Jetcopter head??

DStJohn
Senior Heliman
Location: Ft. Collins, CO

I have read that some people have been complaining about the Jetcopter head being too soft and mushey. Has anyone tried changing to the hard o-rings and shimming the head so it's tighter? If do, did it help?
I don't seem to really notice much with my Jetcopter head, but I am flying the same unit on my 23 lb Benzin Bell 47. Maybe that's why I have not noticed the head feeling soft, I am use to the Bell 47.

I wanted to get your input before I tear the head apart.
Thanks for the input!

Dan St.John
East Coast Scale Helicopters Vario Field Rep

04-16-2003 Over year old.

Bill Ludwig
Veteran
Location: Tucson, AZ

I don't know about the harder o-rings, Dan, but I put the extra shims in it and it didn't help at all.

Bob Wilcox is sending me a new set of 'gears' to speed the head up to 1400-1450. It's going to be a pain to install them, but I'm anxious to see if it helps the soft head problem. I'll post the results in this forum.

- Bill

04-16-2003 Over year old.

Peter Wales
Key Veteran
Location: Orlando Fl

I read about you guys having this complaint and having had experience of this with Vario before, I am converting my latest Jetcat to system 88 and I am fitting a Robbe Cuatro head on it. It should be finished today with a bit of luck.

The Cuatro head is designed to run 800 mm blades super smooth in an FAI regime so it should solve that problem......I hope.

Peter Wales

04-16-2003 Over year old.

HOMEPAGE

optikaman
Veteran
Location: EnglishTown N.J.

Gear Change?

Bill how can we get the gear upgrade, is it available for general release?

Peter please update us on the system 88 change to the SX flight performance.

04-16-2003 Over year old.

Bill Ludwig
Veteran
Location: Tucson, AZ

I don't know about the availability of the new gears. You'd have to ask Bob Wilcox. I just know that he only got a few sets in for evaluation purposes.

04-16-2003 Over year old.

Phil Cole
Veteran
Location: Redwood City CA

Dan,

I have the hard o-rings in my Jetcopter, and some more shims. If anything it made hovering a bit less locked in, but I didn't leave the soft o-rings in there for more that a few initial test hovers.

My main motivation was the possibility of bottoming with large cyclic inputs, leading to non-linear behaviour.

Another thing that I noticed was that the grips are a somewhat sloppy fit on the bearings. This adds unintended delta (I assume it's unintended) which can be good or bad, depending on lots of other things. I haven't thought it through for the Jetcopter yet.

There was a long thread on delta with some useful input from people who've done experiments with this stuff. The effect of sloppy grips was specifically mentioned. It was about a month ago. Search for posts from Wayne Mann since he doesn't post that much, making it easy to find.

Bill,

It that the wider belt that can take the extra power when you increase the engine RPM, or are you actually changing the gear ratio.

Phil

04-16-2003 Over year old.

DStJohn
Senior Heliman
Location: Ft. Collins, CO

Thanks for the info Phil!
I think I will get some more time on it before I change the o-rings. Interesting that it made it feel less locked in. I am planning on coming to Circumgyration, I may have to bring the Jetcopter with me. Maybe we can get a gaggle of turbines out there at one time!!

Dan St.John
East Coast Scale Helicopters Vario Field Rep

04-17-2003 Over year old.

Phil Cole
Veteran
Location: Redwood City CA

It's gonna be turbine city, Dan.

My Jetcopter need a bit of assembly work at the moment, but I'm putting all my spare time into a scale model (non-turbine) for the sport scale competition.

It's a collection of bits from various places, and never appreciated just how long it takes when you have to make everything fit with everything else instead of just buying it that way. I figured I needed practice building something instead of just assembling it, and I'm getting it.

Phil

04-17-2003 Over year old.

Vario_Canada
Heliman
Location: NB, Canada

One modification that seams to help a lot is to install the Swivel bearing (joint bearing Order No. 72/31) in the head center piece. See Cat 6 p 76. The helicopter's weight is now supported by the bearing and not the o-rings. I also use the longer 600mm flybar 70/30 and the 060/4 on the inner ring of the swashplate on the JetCopters. .

Buy using the shims, bearing, flybar and longer balls Control authority is much improved !

Dan

04-17-2003 Over year old.

HOMEPAGE

DStJohn
Senior Heliman
Location: Ft. Collins, CO

Thanks Dan!
I hadn't thought about adding the center bearing and the longer flybar. I'll have to order the bearing from Josef and fit it to the heli. I think I have an extra flybar in the shop. I was digging through my spares yesterday and saw the hard o-rings and wondered if anyone had tried them. We'll get this figured out yet!

Dan St.John
East Coast Scale Helicopters Vario Field Rep

04-17-2003 Over year old.

Bill Ludwig
Veteran
Location: Tucson, AZ

Phil,

Bob Wilcox is sending me a different gear ratio - same belts.

- Bill

04-17-2003 Over year old.

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Got Jet Fuel? Turbine Helicopters > Anybody tried the hard o-rings in the Jetcopter head??

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