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HomeAircraftHelicopterJR Heli Vibe 90/50, Sylphide 90, GSR260 › Sylphide Tail Belt question
03-04-2008 02:03 PM  10 years agoPost 1
Brett Horton

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No problem, but when flying my Sylphide, I can hear the belt slapping the tail boom in hovering maneuvers. I have tightened the boom to the point I want (not overly tight) but it still does it at times. Is this normal for this ship?

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03-04-2008 02:09 PM  10 years agoPost 2
steverobertsuk

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London, England

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Yeah it normal with the Sylphide and most 90 size belt drive machines when running a low head speed.

I would recommend that the belt tension is fairly tight.... you may find that with it loose you will loose teeth off the belt after a period of time.... did this to my machines and they have been ok for 18 months now.

Steve

Team JR, Motors & Rotors, OptiPower

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03-04-2008 02:15 PM  10 years agoPost 3
Brett Horton

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Yeah what I figured.
Such a long run I guess.
Thanks

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03-05-2008 12:10 PM  10 years agoPost 4
poerQwa

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Rotterdam, The Netherlands

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I fly with a fairly tight belt as well and every now and then you can hear the belt slapping.

Actually at the 2005 WC in Spain I was able to look into the japanese team(ito and the likes) Sylphides. The belt was soo loose you could not believe it but they were also flying with ridicully high head speeds 2100+.

Greetz,

Marc

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03-05-2008 12:49 PM  10 years agoPost 5
synodontis

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United Kingdom

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use K&S red pulleys if you need. They have more teeth than stock (one extra I believe).

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03-05-2008 02:11 PM  10 years agoPost 6
RotarSoft

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St Leonards On Sea UK

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I always ran my Sylphide tail belts very very loose and never lost a tooth. My old Hirobo machines were the same too... not sure where this really tight belt thing comes from as in my mind it's not good for the belt..

Cheers

Mark

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03-05-2008 04:47 PM  10 years agoPost 7
synodontis

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United Kingdom

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Mark,

I don't run my belt tight either. I'm sure the bearings don't like it too. But I do lose belt teeth, but not with the red pulleys.

The other thing is that most people are complaining that the tail pitch link control gets sloppy over time, but that has never happened to me, and the Vibe uses a similar version, so all this stuff is getting a little weird.

SKS

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03-06-2008 08:46 AM  10 years agoPost 8
Roak

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Almere, Netherlands

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I run my belt very tight also (Sylphide as well as Venture 90), mostly to prevent the slapping of the belt while hovering. It doesn't seem to robb too much power or damage the bearings. They are still fine after 4 years of service. It's funny you mention the tail pitch links Synodontis, Just this week I decided to do something about the play in the pitchlinks. The play develops because the hole where the pin goes through gets slightly bigger over time. I ran a drop of thin CA through the hole and let it dry first. Then I drilled it out again just enough to fit the pin again. Play gone !

regards,
Rob

Planks ? No Thanks !

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03-07-2008 08:55 PM  10 years agoPost 9
synodontis

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United Kingdom

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Rob,

Could you show me what hole to fix, there are two points of rotation on the pitch link. Are we talking about the hole that the long threaded bolts goes through?

Despite all this, I'm still crazy about the Sylphide. It really is an amazing machine, awesome in fact. Every time I take it out to hover I understand why I like flying.

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03-08-2008 10:27 PM  10 years agoPost 10
Roak

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Almere, Netherlands

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I'm talking about the holes through which the pins of the y-shaped ball-links go; the ones attached to the blade holders. The hole that needs fixing (with mine anyway) are the holes in the pitch plate where the pins run through.
The rest of the linkage is still slop-free.

Planks ? No Thanks !

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03-09-2008 01:02 AM  10 years agoPost 11
synodontis

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United Kingdom

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but then I don't have those issues.

But other users are telling me it's the tail pitch ITSELF that develops slop over time and I've not known that to be the case with me.

Update: looked in the manual, I'm actually suppose to be talking about the tail control lever, the black mechanism in your photo that is attached to the tail pitch link. Other people are telling me that it gets sloppy over time. This is not in my experience, and the vibe's tail control lever is essentially the same with one less point of rotation.

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03-09-2008 10:43 AM  10 years agoPost 12
Roak

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Almere, Netherlands

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That's strange, the linkage looks to be designed just for 1 reason: to stay slop-free over time. At with mine it still is (except for the pitch plate holes).The linkage in my Sylphide kit was built already, and I never took it apart (no need to ). Maybe the Vibe linkage has be be assembled and something goes wrong there ?

Rob

Planks ? No Thanks !

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03-09-2008 12:02 PM  10 years agoPost 13
synodontis

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United Kingdom

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Sorry, I mean to say that the Sylphide's one people are saying they get slop develop over time.

Mine have never developed slop at all. This tail control lever was the K&S 689 part number if you remember and JR just made it black and used it as their own. There is actually a newer K&S tail control that is simpler and lighter.

I also have not heard of anyone develop slop on their Vibes' tail control.

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HomeAircraftHelicopterJR Heli Vibe 90/50, Sylphide 90, GSR260 › Sylphide Tail Belt question
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