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11-13-2005 07:42 PM  14 years ago
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Phil_Mart

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Newcastle UK

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Alouette Tail!
Today the weather was good (for a change) and I got some nice flight testing time in:

However, this seems to be a case of the weak Vario tail construction:

Fortunately this was noticed after landing the heli Kind of proves the value of flying the carcass before spending time to paint it

I've heard about this problem before, anyone got any pics of a recommended fix ?

I will be talking to Vario tomorrow.

Philip Martin.
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11-14-2005 01:51 PM  14 years ago
Peter Wales

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Orlando Fl

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💎Sustaining Member
My analysis of that is the tail drive shaft is too long and the vibes from the engine went through it and had to break something. It looks like the dogbone coupler is well inside its socket. Did you leave about 1mm play in there?

The cure? I would unbraze that tube on the end and get another piece of tubing to replace it. I would hate to see my tail rotor depart the heli in mid flight. There will obviously be a lot of sideways stress on the joint in flight if you repair it ands it may not stand up to it.
Peter Wales
http://scalehelicopters.org
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11-16-2005 08:04 AM  14 years ago
Phil_Mart

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Newcastle UK

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Thanks for the comments.

I fully agree with the concept that the welded area should be
after brazing and feel that this has not been done here. This would lead to embattlement of the socket and hence the crack.

As to the set-up, yes there was the required 1mm slack in the drive rod and the alignment of the two bearings supporting the shaft was spot on. There was also very little vibration from the engine, only the once every few seconds twitch where the engine is on the rich side whilst running it.

A copy of the photo has been forwarded to Vario for their comments and I await their response.

Tig welding repair, plus fitting a slightly beefed up furrel seems to be the route to go on this one

Philip Martin.
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