FN5 turrets for Wellington

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mickszysler
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Re: FN5 turrets for Wellington

Postby mickszysler » April 19th, 2019, 6:53 pm

Timothy,
I, like many others, have been following your progress through the years and are utterly amazed by your craftmanship and dedication. Is this model ever destined to take to the sky when complete, or is it intended to be a static museum masterpiece?
Mick

Timothy Huff
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Re: FN5 turrets for Wellington

Postby Timothy Huff » April 19th, 2019, 11:15 pm

Thanks, but it's not really craftsmanship. The hard work is really on the CAD side, producing the drawings for each part, and then some time-consuming and fiddly painting and cutting of threads etc. I'm self-taught on CAD, although I did an O level in technical drawing 35 years ago or so, which has helped a bit. Everything I've done on this project has been learned or researched over the last 3 years or so. A lot of it has been trial-and-error, finding out what the limitation are of SLS nylon 3d printing in terms of minimum thicknesses, or smallest details that'll resolve etc.


It's certainly my intention to fly the turrets, within a Wellington model. The whole point of the exercise was to mount FPV cameras in the turrets. I daresay I'll loan them to Brooklands whilst the airframe is being built, as they've been terrifically helpful over the years with research on the geodetic side of things.

To be honest, I've learned so much doing these turrets, that were I commencing the turrets now, there's a lot of areas I'd redesign, mostly from an 'ease of assembly' point of view. I may yet revise the design to improve that aspect, and cost out producing them as kits, in case anyone else wants a crack at 'em.

I have some surplus parts, so if anyone would like an operating 1/4.5 scale reflector gunsight, I can provide it as parts or assembled and painted. (Ian - I think you have all the required parts bar an amber grain-of-rice light-bulb)

Timothy Huff
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Re: FN5 turrets for Wellington

Postby Timothy Huff » April 27th, 2019, 9:59 pm

Well yesterday the most enormous - and unexpectedly so - delivery of "parts" arrived from the printers. For some reason, they seem to print multiple copies of the smaller components, far more than are on the drawings sent. So there was a fairly mammoth sorting session as I sorted and bagged parts before feeding them into the now well oiled system for processing prints from polishing to drilling to tapping threads, to airbrushing to lacquering if needbe. else to hand-painting, before they end up the "ready to assemble box", where-after the real fun begins!

The first job, however, is to rebuild the rear-turret LH door, to verify the design changes made will now allow the full-movement of the handle and latching bolt mechanism. It'll certainly be easier to put together I think. (I hope!)

The latest video:

https://www.youtube.com/watch?v=I14ZXCpX5Po&t=46s

- which is pretty much just a survey of the new parts that have turned up for the cupola, and a bit of footage of some of the new parts lashed-up atop the previously built turret stuff. I couldn't resist it!

So I expect that'll be it from me for a few weeks, until these parts start to be assembled properly

Timothy Huff
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Re: FN5 turrets for Wellington

Postby Timothy Huff » May 10th, 2019, 8:57 am

The last week or so has been sorting parts, getting a few reprints done, and painting parts with grey primer, mostly cupola parts. When they're assembled and painted I'll post a picture or two. In the meantime I've started collaborating with an amazingly talented German chap, -another "Tim" - who has produced quite the most incredible miniaturised working instrument panel for use with an FPV camera, and a far far better collimating gunsight than I was able to make. His gunsights are really works of art optically speaking, but are designed to be fitted as the gunsight for various fighter's fixed armament. Consequently he is able to achieve the focal length (If I understand the optics correctly) by having quite a long stem under the sight, which would of course disappear behind the instrument panel.


With the Mk III non-gyro sight as fitted to the FN5 turret, however, it's not possible to have such a "stem", so we're looking at bouncing the image around mirrors within the sight-box before it is reflected to a proper lens and thence to the reflector. Should be interesting!


Do please visit his Youtube channel, his work is quite extraordinary.
https://www.youtube.com/channel/UCJm4ZSKF0ZT3guMskwZp3Eg

I've also put up a couple of new films
https://www.youtube.com/channel/UCQslWREMy2zKgQW4ASDuh6Q

When driven out of the workshop by paint fumes, I've been drawing-up the gunner's lap-strap - a bit of a bugger to draw it has to be said - it's not perfect, but it's fairly close. If anyone is able to tell me if the release to undo an RAF lapstrap of this type is fitted to be pulled with left or right hand, I'd be most grateful to learn!
600lapstrap3.jpg
The lap strap - right way around? (view from rear to forward)
600lapstrap3.jpg (46.11 KiB) Viewed 568 times


In other developments I've established the stencilled warning on the exterior of the turret doors, and had this translated into Polish, having learned that all cautions and placards were translated into Czech or Polish for squadrons crewed by those nationalities. A stencil will be made to put those on in the closest font I can find to the exemplar I have.

An so it continues!

Alex Jones
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Re: FN5 turrets for Wellington

Postby Alex Jones » May 15th, 2019, 9:08 am

Looking good Tim... I'm excited to see the cockpit :)

Timothy Huff
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Re: FN5 turrets for Wellington

Postby Timothy Huff » May 19th, 2019, 1:33 pm

LOL. That's rather a long way away, but I'll be looking to build a fully functioning instrument panel eventually, and whilst I'll not be building it for some years, it's interesting to see what's possible now. Air-brush issues have put paid to further painting of cupola parts, but the acid-etched brass-work is in progress, as well as the stencils. I've also made and fitted the two leather grab-straps per turret door, which the gunner reached behind to pull each door shut prior to bolting. Also completed are the four turret doors, hinges and connecting stanchions to which the hinges attach.


Yesterday I painted and fitted the 3d printed webbing "lap-straps". As with the seat-cushion these are able to be removed or folded back for the installation of the FPV camera (eventually). The printers sent me some 5 extra pairs of the 2-part lap-straps, so if anyone can use them (1:4.5 scale) let me know your postal address and I'll bung them in an envelope. These were designed to resemble a strap laying on the seat, rather than around a figures legs, so might not be appropriate if using a pilot or gunner figure.


The straps are attached to the seat anchor points with tiny brass shackles from Prime Miniatures, which one would need to source.

As I'm forestalled on painting and rams, the next jobs are to make the wiring loom and JST connectors, and to tidy away the rats-nest of wiring, as well as drawing the plugs to make moulds for the PETG cupola "glazing".

lapstrap.jpg
Completed lap-strap on front turret seat
lapstrap.jpg (48.1 KiB) Viewed 469 times

Timothy Huff
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Re: FN5 turrets for Wellington

Postby Timothy Huff » June 3rd, 2019, 9:22 pm

I've put a couple of new films on YT. The first is a look at the lashed-up Cupola structure. I can't proceed further with that until the brass parts arrive which will stiffen the members. The second film - slightly truncated due battery failure - shews how I attach SLS nylon parts together with machine-screws, by cutting threads or using internally threaded press-fit brass inserts (usually for blind holes), which may be of interest.

Note that cutting threads in ABS plastic doesn't work, the brass inserts are the only means I've found of creating threads in this type of plastic.

https://www.youtube.com/watch?v=UifJAvBqWCA Cupola film

https://www.youtube.com/watch?v=ptCIMADBk1k&t=2s Tapping and Brass inserts

Otherwise I've just been painting all the tiny brackets and plates which will ultimately fix the "plexiglass" (PETG) panels of the cupola to the internal structure.

Timothy Huff
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Re: FN5 turrets for Wellington

Postby Timothy Huff » June 26th, 2019, 2:26 pm

Hi all,

the last couple of days have been spent building the internal structures of the cupolas, and hanging the front-turret doors. Some gap-filling is required, a little trimming and some remedial painting, before moving onto the rear-turret doors.
https://www.youtube.com/watch?v=B3mgS9NKpSk


Today the Mk III (non-gyro) gunsights arrived from Tim Noack. These we collaborated on to combine his optics and electronics into my rectangular shaped box beneath the sight. Each box contains a sloped mirror, a reticule and LED, projecting through a lens onto a sloped glass reflector. Currently the automatic dimming components are not wired in, leading the reticule appearing overly bright in the shot below. I could not get my stills camera far enough into the turret to obtain the correct focal length, which also means the reticule is larger than will be the case when the smaller FPV camera is set closer to the sight.

600sight open.jpg
Smoked filter undeployed
600sight open.jpg (50.06 KiB) Viewed 193 times

600 pipper noack.jpg
Reticule overbright and overlarge for reasons above
600 pipper noack.jpg (40.91 KiB) Viewed 193 times

600sight closed.jpg
smoked filter (for searchlight glare) deployed
600sight closed.jpg (50.03 KiB) Viewed 193 times

Timothy Huff
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Re: FN5 turrets for Wellington

Postby Timothy Huff » July 4th, 2019, 4:22 pm

A couple of new films up on YT, showing the Polish/English caution stencils and some footage of the new gunsight with automatic dimmer wired in. Apologies for the camera-work on the latter. The strap brass for attaching the cupola windows has now been ordered, and wiring in the various electrical services had begun. After much experimentation and research the hydraulic rams will now be operated pneumatically, which should allow for both sides of the cradle to be elevated and depressed with equal and simultaneous forces applied - something that wasn't the case with the "electric ram".

So, getting towards being finished now, time to make the initial foam plugs which will eventually be used to make the moulds over which the PETG can be formed. The very last task will be to paint, construct and fit all the "cosmetic" hydraulic lines.

https://www.youtube.com/watch?v=-twklq8s3s4 stencils

https://www.youtube.com/watch?v=IQEOVeYPJYY&t=3s gunsight with new optics and reticule


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