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Fidd88

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About Fidd88

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  1. Hi, I know the collector-ring itself is steel, ie the ring into which exhaust gases are collected from the exhaust manifolds. What's less clear, is if the shroud containing the ram-fed cooling air is an alloy or steel. Looking at the Brooklands Wellington, it certainly appears to be alloy, but still might be this steel. The corrosion in the Beaufighter ring pictured in thread, does suggest you're correct though. Next time I'm at Brooklands I'll place a magnet on it.
  2. Excellent post, it's great to see some colour pictures of them. I can't speak to the Beaufighter, but I'm fairly certain that on the Wellington, these Townsend Rings are a steel inner-collector-ring, taking the hot gasses, with an alloy shroud around it, which is fed with ram-air, thus cooling the exhaust gases before they're emitted, which reduced both flame-flare and noise. That said, your picture appears to show corrosion on them more consistant with very thin steel on the hotter external (radially) portion of the ring, which does cast into doubt, my assumption that they were alloy. Perhaps
  3. I also would highly recommend Fusion 360, even though some features that were previously available on the free hobby use version have recently been rescinded.
  4. I know! I spent some time talking to some of the chaps that did it, with a single hundred plus year old fly-press - and some determination! Talk about patience! You could have bottled my expression and sold for thruppence a time, once the full horror of building it thus sank into my conscious! Blimey, but that was a labour of love! My planned method looks positively Henry Fordesque compared with that - tiny movments at a time, and then drifting out the wood blocks afterwards. Crikey! The found a better frame 50 bulkhead (the one to which the trailing edge of the wing and aft end of the bomb b
  5. Cheers! The issue with the rolling-machine making the channel is not difficult about the cross-section, it's curving the geodetic during that's the complex bit. Hence my decision to extrude first and curve after. Which, incidentally, is how the missing geodetics on R for Robert at Brooklands, was made. I'm not a trained engineer at all, I worked in a motorcycle workshop years ago, rebuilding engines and servicing, so I've a little mechanical common-sense, and an O level in technical drawing from 40 years ago - indeed initial drawings for the turrets were pencil on paper at a drawing board
  6. Hi lads, I can't tell you how brilliant it has been to get some encouragement at this juncture in the project, as well as going through a divorce after 26 years - the Wellington seemed stymied at every turn, and has been really hard to keep up the enthusiasm for it in the face of difficulties with the riveting, and then insane quotes for things I'd assumed - my error - would not be overly dear. I really needed some encouragement to get past this point, as the difficulties expenses and technical problems were seemingly stacking-up faster than I could deal with 'em. So THANKS! Much apprecia
  7. Some better news. I've had some assistance from some of the other RC chaps who've suggested using CNC to make a small number of these fixings, and to use them to make a mould from which wax positives can be cast and attached on a suitable wax sprue. These can then be investment cast in alloy, in numbers, and machined/drilled/ground as required after the casting. Which puts it financially at least, back on track, and I get to learn some more skills! I've also had the offer of a loan of a small forge, which is both kind and hugely good for morale! I'll also be looking into a different form of ca
  8. Hi all, More news on the Wellington project - but not "good" news. I'd budgeted around £1000 to have the two types of solid internal fittings for the geodetic joints, as shewn in the film above, and found a company in China who were able to undertake the work. When the quote came back it was (for 13,000 fittings) over £17,000! Which is a complete show-stopper if I can't work around it. I'm currently investigating making the "butterfly" and "wishbone" joints by folding flat sheet cut to shape - which is a much cheaper proposition to have done, but may be problemtical in practice, and
  9. After a couple of days at the pc the two main joint-types for the alloy "basket" which forms the fuselage and wings of a Wellington have been drawn up to ensure I can get all the internal metal fittings made before the extrusion die tooling costs are paid.
  10. Not much news, but at last a little progress. I've got a mate to turn up a rivet-gun tool-tip for placing the 2mm diameter rivets, with a long enough reach to place them in the majority of the "ordinary" geodetic joints. All 16 rivets and 2 machine-screws with nuts per single joint! I haven't counted all the joints on the Wellington, but I expect to use well over 20,000 rivets on the whole airframe. I'm now redrawing all the joint fixtures and fittings, and the profile of the channel, as well as the inserts used to prevent the cross-section collapsing as it is curved. Have now decided to
  11. No problem. It always amazes me the breadth of knowledge in forums such as these, this was just one I happened to know a bit about. I can't remember what groceries I need - but this sort of stuff just seems to stick in my memory! Lord knows why... I forgot to mention that such gas-indicating paint was also applied to British field-guns, trucks, tanks and much else from the pre-war period until 1941, until it became evident we'd not all be clobbered with this muck at the outbreak of war. The "Keep Calm and Carry On!" poster is thought to have been designed to be read wearing a gas-mask. It
  12. Yes. It would have reacted to Mustard, turning from a yellowy zinc-chromate colour to pink in it's presence. It may also have been reactive to phosgene. As the German stance on using chemical weapons was unknown at the outbreak of war, but they'd been enthusiastic exponents of chemical warfare, in the Great War, the RAF was fully ready retaliate with mustard, were the Germans to use it first, and It was likely as much to indicate contamination from our own gas ordnance as enemy chemical attacks. Bombers carried circular indicators, around 9-12 inches in diameter, usually (but not exclusively)
  13. Hi all, I trust you're all keeping out of the path of this bloody virus? I was not surprised today when the British PM "cancelled Christmas" by doing away with a 5 day relaxation of the rules to enable us to get together. People just don't get it. We're in the fight of our lives against this damn bug, and being able to get together or go to the pub or whatever must come a very distant second to keeping the infected people requiring treatment below the point where our health services cannot cope - or else we'll cop for it like the Italians and New Yorkers did with mass-graves and much high
  14. Hi chaps. What with Covid, and it's effect on lots of companies, I'm struggling a bit to make progress at the moment. The rivet tool company I'm working with are having difficulties determining the tool-head to use to apply these very small (2mm diameter) pop-rivets. Until the tool-heads size is known, I can't do the CAD to finalise the extruded alloy profile or the sheer and gusset fittings, or the inserts needed to curve the extrusions. So, instead, I've been having a clear-out and reorganisation in the workshop to gain more space to the right of the bench, which I'll need for operating
  15. I'm unable to work these days - legacy of an old car-accident, so have decided to see if anyone wants one of these models, and is prepared to pay to have one built. To that end, I've put "commissioning one" onto Ebay to see if there's any interest. As they take 5-8 months to build and paint, and thousands of pounds to print all the parts to the required finish and dimensional accuracy, these are far from a cheap model to build. If I get a lot of interest I may look into getting parts injection-moulded, which would bring the per unit cost down, but raise the initial tooling costs. The item
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