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Zephyrus from down under

Let us all watch your new project progress.
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RobbieB
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Joined: 07 Mar 2015, 22:22
Location: North West

Re: Zephyrus from down under

Post by RobbieB »

Looking really good Vince - keep at it.

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terry white
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Joined: 18 Mar 2015, 21:08
Location: wareham,dorset.england

Re: Zephyrus from down under

Post by terry white »

Hi Vince,
Far from 'amateur status' This is a great build log. I love it when builders show the things that go wrong as well as the things that go right, needing great thought and ingenuity to get around the problem,shows me that Im not the only one.You know what I mean,your watching T.V. but your mind is in the workshop.Your wife is having her one way conversation with you while your working out how to deal with the latest problem, and saying yes to her mother coming to stay and wanting a new outfit for the purpose!! You go to bed but can't sleep,you toss and turn with the problem running around and around in your head.The birds start to sing so you know its morning and you have to be up in an hour to go to work.These are the beautiful things that ARTF fliers will never experience, poor souls. ;) Regards Terry.

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Barry_Cole
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Joined: 10 Mar 2015, 09:30
Location: Hampshire UK

Re: Zephyrus from down under

Post by Barry_Cole »

Great stuff, Vince. Keep it up.

BC

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VinceC
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Re: Zephyrus from down under

Post by VinceC »

AnyTrans.jpg
Building continues with the skinning of the wing top and bottom and installation of top and bottom opposing opening airbrakes.

Progress was delayed due to problems with the aileron hinging. The original was top hinged and a complicated progressive rotation of the outer wing requiring the rib nose to be dropped allowed the top hinge line between the aileron and wing to remain straight on deflection. Unfortunately I failed to achieve this almost impossible task and went for an easier centre hinge

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VinceC
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Re: Zephyrus from down under

Post by VinceC »

You know when you are taking a long time when you have to search a long way down the Topics to add another post. The project is still under way and I have finally got the second wing just about built. All I can say is I am glad it's not a bi-plane. The second wing went easier than the first as I was aware of all the pit falls and will have to go back to the first wing at some time to make a few minor mods.
IMG_0817.jpg
One of my new problems is the method of securing the wings to the fuselage. The top of the fuselage cabin is glazed and rubber bands stretching across would be intrusive, so I am trying a system I heard of many years ago by using TENAX fasteners, which are used for securing the hood to the bodywork of convertible cars. The ones I purchased have a 1" stud with a 2BA thread. Fortunately the thread seems to be common to 5mm, so I have placed a 5mm 'T' Nut on the inside of the wing. The holding attachment is spring loaded so that a pull on the domed head release the connection. Well that's the theory over......
IMG_0815.jpg

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VinceC
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Re: Zephyrus from down under

Post by VinceC »

It is all built, but I have a wing joining problem to overcome

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VinceC
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Re: Zephyrus from down under

Post by VinceC »

Here is my problem.

The cabin of the Zephyrus is almost totally glazed on the sides and top offering little in the way of strength.

The wing leading edge is raked back almost to the spar.

My first idea was to fit a mechanical locking system halfway along the root rib, but with the weight of the wings it just bowed the root ribs on the fuselage and would have pulled it apart on a landing

I then resorted to non scale and visible rubber bands across the fuselage which I would later box in and although they held the wing, the leading edge had a tendency to open up by the wing swivelling on the struts. Maybe the gap is made worse by the fact the hooks are behind the line of the strut

I think I should go back to a mechanical connection, but I am reluctant to secure the wing to the fuselage. One idea is to pin the outer ends of the wing joiners through the wing using nylon bolts tying both wings together, but I am open to suggestions on this one
Gap3.jpg

Christian Baron
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Joined: 16 Jan 2018, 17:08
Location: Haltern am See

Re: Zephyrus from down under

Post by Christian Baron »

Vince,
maybe you could use a 3mm steel rod with both ends bended 90 degree. This steel rod should be reach from one wing half to the other inside the fuse.
I would make steel connectors like the original has at the main spar that goes into the fuse area between the wings. Into these connectors you could press the steel rod and secure this with a screw, that the steel rod can't be remove by vibration or and move.
Hope that my english could explain what I mean.

Christian Baron
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Re: Zephyrus from down under

Post by Christian Baron »

Vince_1 1.jpeg
Made a simple drawing by hand.

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chris williams
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Joined: 10 Mar 2015, 10:50
Location: Blandford Dorset

Re: Zephyrus from down under

Post by chris williams »

094.JPG
Vince, IMHO, a rigid wing mounting set up may be fine for aerotow, but much more liable to damage on the slope. The system on the Spalinger, with a similar wing configuration works a treat, with the wings springing out and pulling back in again. Of course, the top of the open cockpit puts a spanner in the works, but I think if it was me I'd just paint it silver and hope the Scale Police aren't watching... ;)

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