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A Depron Sea Vixen.FAW2

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Simon Chaddock13/08/2017 00:52:12
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Moving on with plan B, top deck planking.

Top planks 1

One last plank still to do - always the most difficult to fit - then onto the cockpit and 'coal hole'..

In the interests of saving weight they will be solid, no glass, being planked in 2 mm Depron like the rest of the fuselage.

Tom Thomas13/08/2017 03:41:28
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170 photos

Magnetic wires? And why did the vixen have a side mounted cockpit do you think?

Model and techniques here are very impressive by the way yes

Colin Leighfield13/08/2017 06:28:03
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2031 photos

The cockpit was offset to make room for the "coal hole" described by Simon, in which the radar operator/general dogsbody was incarcerated to operate the electronics. Rather him than me. The Sea Vixen had a pretty lousy accident record and I wouldn't have enjoyed being stuck down there with no real view of the outside world.

Edited By Colin Leighfield on 13/08/2017 06:28:39

Dave Hopkin13/08/2017 08:13:50
3603 forum posts
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Posted by Colin Leighfield on 13/08/2017 06:28:03:

The cockpit was offset to make room for the "coal hole" described by Simon, in which the radar operator/general dogsbody was incarcerated to operate the electronics. Rather him than me. The Sea Vixen had a pretty lousy accident record and I wouldn't have enjoyed being stuck down there with no real view of the outside world.

Edited By Colin Leighfield on 13/08/2017 06:28:39

The theory was that with early CRT throwing the operator into the coal hole (with no widow) he would be able to see the display better

Simon Chaddock13/08/2017 11:23:16
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The Sea Vixen off set canopy was not quite unique as some marks of the Canberra had the same particularly the B(I)8 and the PR9 but at least on these marks the second man had an ejector seat!

"Magnet" wire.
Its the name used for lacquer insulated solid copper conductors as used in the winding of an electro magnet.wink 2

Edited By Simon Chaddock on 13/08/2017 11:27:47

Tom Thomas13/08/2017 17:53:10
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173 forum posts
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I never knew it was 2 up, thought it was just the pilot, and thanks for the magnet wire explainations Simon, something new everyday! smile

Simon Chaddock13/08/2017 19:07:24
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4965 forum posts
2577 photos

Colin

I am not sure the Sea Vixen's 38% accident record was all that bad for carrier operations of the first generation 'heavy' fast jets. Its compatriot the Supermarine Scimitar suffered a 51% accident rate!

It does rather show just how risky it was at the time. wink 2

Simon Chaddock13/08/2017 22:03:22
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4965 forum posts
2577 photos

With the rear fuselage skin complete planking the cockpit area begins.

Cockpit skin 1

A bit of a fiddle to do but it is at least getting near the end! wink 2

Stephen Jones14/08/2017 00:31:12
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2381 forum posts
1388 photos

Looking good now you are on the home stretch.

Steve thumbs up

Simon Chaddock15/08/2017 23:15:45
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4965 forum posts
2577 photos

At long last all the planking is complete!

Skin cpmplete

So all ready to cut it open again at the appropriate point when I have the battery! smile o

It weighs 9.3 oz (263g) so positioning the 3.7 oz (105 g) battery will be fairly critical. wink 2

Simon Chaddock18/08/2017 22:57:40
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4965 forum posts
2577 photos

An initial bit of the underside painted.

Paint 1

Really a bit of an experiment to explore what sort of surface finish can be achieved and how heavy it is likely to be using Scola water based (foam safe) acrylic paint.

The white Depron underside of the wings only need one coat but the planked fuselage areas really need 2 or maybe 3 with each well sanded to hide the plank edges.

So far so good.

Stephen Jones19/08/2017 00:30:50
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2381 forum posts
1388 photos

Nice workmanship,

And good luck with the maiden.

Steve

Simon Chaddock21/08/2017 22:56:31
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4965 forum posts
2577 photos

 

Painting is going very slowly largely due to the need to let each coat dry hard before attempting to sand out the imperfections but its getting there slowly.

Paint 2

The reason the outer panels have not yet been painted is I have identified a bit of a problem - one wing has a couple of degrees incidence than the other! smile o

I thought I was very careful when I glued it all together but obviously not. sad

It looks a bit more than I could reasonably expect to 'twist out' so I fear a wing outboard of the boom is going to have to be cut off and re fixed or possibly both as it would reduce the degree of 'adjustment' required.

Still thinking about the best way of doing it. wink 2

 

Edited By Simon Chaddock on 21/08/2017 22:57:28

Colin Leighfield21/08/2017 23:07:55
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5263 forum posts
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Looks fantastic Simon.

Andrew Price 222/08/2017 00:24:40
790 forum posts

Doesn't it just!!

Simon Chaddock28/08/2017 12:00:15
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4965 forum posts
2577 photos

After much thinking I think i have successfully 'cured' the wing incidence problem.

By completely cutting about 40% (from the tailing edge) of the RH wing just out board of the boom I was able to lift the trailing edge by 2 mm which in effect 'twisted' the whole wing thus reducing its incidence. The wing skin was simply then glued into its new position. Painting started on the outer panels.

Wing adjust 1

As the majority of the strength of a monocoque wing is generated by the first 60 % of the wing chord this 'surgery' does not appear to have weakened it significantly.

Hopefully any residual unequal lift will now be within the capability of the ailerons for the maiden and can be subsequently overcome by judicious local wing twisting and the application of a bit of heat.wink 2

Colin Leighfield28/08/2017 18:33:45
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5263 forum posts
2031 photos

I was going to say that it looks as if you've cracked it, but thought again when it sunk in that cracking it was the way you fixed it! Looks as if you've sorted it anyway, I'm sure it will be fine.

Simon Chaddock31/08/2017 00:07:59
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4965 forum posts
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At last the battery has arrived so with a bit judgment and guess work this is about the required position.

Batt position 1

A bit further forward than I had imagined.

The intention will be use the radar operators "coal hole" as the battery hatch with the battery inserted and slid forward into a box built into the nose.

Well that's the plan!

Simon Chaddock02/09/2017 18:58:11
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4965 forum posts
2577 photos

According to the weatherman today Saturday was going to be ideal for a maiden so I rushed to complete the Sea Vixen enough to fly.

Complete top

Any further detail can wait!

I took this picture a 9:30 am just before leaving for the field in case it might never look like that again ans i was not far wrong! wink 2

The first flight lasted no more than 2 seconds. It just rolled over into he ground. This was the result. Nose severely crushed  - the picture is after it was pulled back into shape!.

Nose crush

The nose of the LH pinion tank was broken off.

Pnion off

It was a school boy error. I had to reverse the aileron servo but I forgot to reverse the gyro as well! smile o

So with a bit of fiddling with the Tx and struggling to actually see (no glasses) the tiny dip switch on the Rx it actually flew quite well despite the damage.

Video next time.

 

.

 

Edited By Simon Chaddock on 02/09/2017 19:01:10

Simon Chaddock03/09/2017 14:16:17
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4965 forum posts
2577 photos

Just to complete the story the maiden damage is now all repaired and repainted.

Nose repair

And a bit of canopy detail added.

The only problem is wind (gales) and rain forecast!

Edited By Simon Chaddock on 03/09/2017 14:16:48

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