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Colinís Spanish Fury

The only one that actually did anything apart from looking pretty(!)

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Colin Leighfield17/12/2018 15:41:50
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5590 forum posts
2284 photos

327f10a3-38f5-4b3c-a6b5-ab2909d5c051.jpegThe conversation on Danny’s thread lead me to think that the gap between FS3 and F7 was too long, so I made an extra former and the stringers are now better supported.7694ec64-6804-4e71-b22b-28d84b9bf9e4.jpeg

Colin Leighfield02/01/2019 22:30:50
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5590 forum posts
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e3bab4b2-a788-43b6-b17c-fc9e8ca6ca9b.jpegAfter the inactivity caused by Christmas I have done some more work on the fuselage sheeting and also the undercarriage. To increase the surface area of the wire to be imbedded in the rubber shock absorber I have encased it in carbon fibre tube. The box that the rubber will be cast in is made from 3mm liteply. Just started on this. I did an experimental cast of the two pack material and it looks spot on for toughness and resilience. I will shortly mix enough to fill the box with the wire in situ. It looks promising. I have also worked out how to make sprung wheels. Not sure it will be necessary though.2780d77b-2337-4d37-b9bd-e34735f9eef8.jpeg

Edited By Colin Leighfield on 02/01/2019 22:32:22

Colin Leighfield04/01/2019 18:07:18
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5590 forum posts
2284 photos

a10a0550-e793-4f4e-95b2-f798def1bece.jpeg

I have mixed and poured the synthetic rubber into the box. It sets in a couple of hours but fully cures in a week. I will build in some reinforcement before closing it off.a389c19e-b95e-4ba3-b852-5f5417b44ea4.jpeg

Martian04/01/2019 18:28:26
2033 forum posts
986 photos

Nice progress Colin ,a question how are you connecting the rear U/C wires from the wing counterpoint

Colin Leighfield04/01/2019 21:39:26
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5590 forum posts
2284 photos

Hi Martian, thank you. This is intended to be the version with the single cantilever legs and Dowty sprung wheels, quite different from the standard Mk1 and 2. As far as I can see there aren’t any wires there. Also the undercarriage is completely clear of the wing. The reason I have made the undercarriage this way and dreamed up the moulded shock absorber idea is to resolve some of the difficulties in making it strong enough and still have acceptable spring reaction. I hope it will work, but I’m optimistic!

Martian05/01/2019 19:02:29
2033 forum posts
986 photos

Now it makes sense .I,m sure it will work optimists rule the world

McG 696905/01/2019 19:16:55
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2383 forum posts
975 photos

... still following, Colin.

Despite the former Festive Season and the accompanying beverages, I'm still wondering about the final result of your 'rubber' suspension, but I really like your approach.

Cheers

Chris

Ernie06/01/2019 13:48:00
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2480 forum posts
16 photos

Hi Colin, Really impressed with how neatly you have folded the brass around the steel wire for the UC. how you do you do it A wee tutorial would be appreciated

ernie

Colin Leighfield06/01/2019 21:20:43
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5590 forum posts
2284 photos

Thanks Martian, I can’t see any reason why it won’t. If I had thought of it earlier I’d have mounted the whole u/c this way. I think it has potential for other planes.

Colin Leighfield06/01/2019 21:22:06
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5590 forum posts
2284 photos

Chris, it was you that convinced me to go the two pack synthetic route. I think it’s a good idea.

Colin Leighfield06/01/2019 21:30:09
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5590 forum posts
2284 photos

Ernie, I don’t think I’m competent enough to teach anyone anything! Basically I bent them into a curve using pliers, then formed them around the wire using a hammer and a flat chisel. The important thing was shaping them to be flat on the face that would be against the wood former and when I had that more or less right, I crimped them up in the vice.

Colin Leighfield09/01/2019 22:29:42
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5590 forum posts
2284 photos

0a2ad7e5-e554-47e7-9183-993c31ecb14a.jpegNow it has had a few days for the polyurethane rubber to cure the undercarriage feels very good, resilient and strong. Starting now to work on blocking in the nose. 8752caaa-892b-4184-a26f-53de7a27c8c5.jpeg

Tony Bennett10/01/2019 09:16:21
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4986 forum posts
129 photos

nice work Colin.

looks to be an interesting suspenion set up.

Tony B

Colin Leighfield10/01/2019 11:01:39
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5590 forum posts
2284 photos

Thanks Tony, I can’t match your skill and speed though. I think this idea for mounting an undercarriage has a lot of potential. Because of the range of Shore hardness/flexibility there is scope for optimisation as well. It might be the answer to making a sprung wheel, I’m thinking about that,

Colin Leighfield13/01/2019 00:00:30
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5590 forum posts
2284 photos

5f22122d-2280-404c-baf2-aa1de392a0c4.jpegSlow progress, but happy so far. I need to sort out wing and cabane detail next.

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