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Fidd88

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Everything posted by Fidd88

  1. After nearly 5 years, I've just completed the pair of FN5 turrets for an RC model. The turrets are designed to be filmed from within, when the eventual model is in flight. So whilst the model isn't complete, a major portion of the effort is, in the form of the turrets. I attach a single picture, in case it might interest you, and a film and still taken from within the turrets. Cheers, 15 minute youtube film with narration
  2. Ever had one of those days? One where everything just goes completely pear-shaped? As of first thing this morning, I'd retrofitted both cupolas with the 3d printed scale "penny-washers" and only had the pair of small windows above the slots to glue into position. This all went beautifully, until I noticed a deeply unwelcome drop of superglue had somehow arrived in the middle of the front half-left window, the one with the cut-out for the ventilator. "Bugger"! - quoth I (with feeling) I then mopped it off, and tried polishing it out with some acylic polish. This extended the d
  3. Bit of a red-letter day. Over the last day or two I've assembled the cupola for the rear-turret and married these to the internal mechanism. I decided to rework the clips which hold the perpex panels in place with the addition of 3d printed scale "penny washers", painted to a brass colour. These make putting the nuts on easier, as the screws can't fall out when trying to start the nut on the thread, and look much better from the inside. So when they've arrived and been painted, I need to refit most of the clips, this'll be much easier to do second time around with each window panel being regis
  4. Cheers Phil. The hard work was really the CAD side of things. Not that I'd really want to do it all again but when it finally prangs - as all RC aircraft eventually do - I hope to have lots of film footage to remember it by! Having built the turrets, I now reckon I could rebuild them inside 6 months - as opposed to the best part of 5 years to go from initial drawings to where we are now.. Further to this, I've just posted a new film: https://www.youtube.com/watch?v=ppVC-NaSqBM
  5. Well, to remains to be seen if it can. as there's plenty of potential "show-stoppers". The intention all along has to be produce a large model Wellington 1c, in Polish/RAF service, with interior cameras - some FPV - to take footage from within the model in flight - hence use of proper geodetics internally. The second aim, is to build the model using alloy geodetics, as close as possible to those used on the original machine. Possible problems are radio-interference from the metal "basket" structure (it's basically a Faraday cage!) to expense and difficulty in construction, to metal-fatigu
  6. After a marathon effort today, the front turret cupola is finished, bar for the ventilators in the quarter right and left window panels, the position of which I need to research. In the cup2.jpg note the 3 M1 machine screws and nuts per attachment. Each nut was started with my cocktail-stick with a blob of blutak, and has to be placed on the thread end, then very gently teased with the stick until the nut starts on the thread, whereafter I can go on in with nut-spinner and jeweller's screw-driver to finish it. Once the cupola is complete, I'll put a little locktite on the exposed threads to pr
  7. The vac-forming for the forward windows of the turrets has now been done, and some properly sized poly-carbonate 1mm sheet sourced for the side and overhead windows which are simple-curvatures. vac-forming film Edit - Addendum: Pictures of front and front quarter panels, with as yet unpolished view through Perspex panels in 3rd shot. Very hard work on the fingers! By Sunday evening, gremlins permitting, I should have completed the front turret cupola completely, which will involve refitting all the brass strapping on the exterior of the turret, and then bolting these through the Per
  8. I've been more or less stalled on this project, for want of materials and restrictions on movement due cv19, meaning that I can't get the vac-forming done. I did get a small tranche of final parts yesterday which have since been painted and fitted. These consisted of a pair of flanges to widen the apertures of each of the spent-cases chutes, and a reinforcing plate on the face of the chute as viewed by the gunner. In both cases these were to widen the apparent width of these chutes which although width'd from the best drawings I could find at the time, are rather too narrow. Also in this last
  9. That's coming on really nicely! You could, if you were feeling really keen, have a go at adding the various hydraulic pipes which are visible especially on the outsides of the arch and thence forwards around the forward face of the chordal braces. Very fine single-strand copper wire could do the job nicely. I don't know if Manchester turrets had them, but Wellington turrets of this era had rotatable ventilators in the top corner of the half left and half right (as viewed by the gunner) front window panels. These were to clear cordite-fumes, which otherwise could make the gunner feel pretty unw
  10. An absolutely fascinating build to follow, thanks for posting this. The planking is particularly clever.
  11. We seem to be talking cross-purposes. A Pegasus is a single-banked 9 cylinder radial, a Hercules is a 14 cylinder double-banked. In the shot above, there are two exhaust ports per cylinder, so if a Pegasus, we'd expect 18 feeds into the Townend ring, an if a Hercules, only 14 (I think!) because they join the ports of the rear bank with those exiting the front bank of cylinders, before they enter the Townend ring. Do you agree?
  12. Correct. I think it's from a Wellington, probably a MkIII, as it's configured for the "Hercules" 14 cylinder sleeve-valved and double-banked, rather than the 9 cylinder "Pegasus". I'd be interested to know if the Pegasus also branches exhausts in the same way two into one.
  13. The confusing thing is that each pipe into the townend ring is served by two cylinders, one a straight pipe, the other forking into it the adjacent cylinder. So I presume the cylinders have two exhaust ports per pot.
  14. They're the chaps. Sorry I didn't mean to impugn your model-making, but you'd be amazed at how often it's wrong in the RC modelling world.
  15. I can't tell you how much I've enjoyed seeing this build. My own father died when I was 5 or so, and one of a handful of clear memories I have of him is building the 1/72 Airfix-kit of the torpedo armed "Beaufighter" ("Beaufort?") variant. I got confused about the instructions, and stuck it on the top wing hard by the nacelle, and was inconsolable, I imagine, at getting it wrong. I can remembers him working with me for hours to remove to the torpedo and remedy the damage with files and sandpaper... I did RTFM more carefully after that, but it's a fond memory all the same. I can also clear
  16. I've had a very difficult couple of days, demoulding the resin from the silicone and plaster mould, made all the more tricky by an error when applying the 2nd and 3rd coats of silicone. It took so long to demould, as I was very mindful that if I became impatient, it was going to be very easy indeed to damage the casting, as whilst the resin is very strong in compression, it's pretty weak in tension, and that any overly enthusiastic attempts to part one with t'other was going to result in a bust casting. Two days later, I'd got the bugger to separate cleanly. I learned lots throughout the whole
  17. Cheers, I'm pleased you're getting something from it. Yesterday, I did the resin pour, which for various reasons was harder than I expected. Altogether far too many bubbles I think, which may prove disasterous when the casting is under vacuum or during the heat-treat. I didn't know at the time, but I wasn't at my best. By later afternoon I had a high temperature, and slept over 20 hours straight. Hey ho. Latest film here: FILM
  18. Cheers. I thought it quite remarkable in the hands of an expert. It's fairly redundant for me as I can 3d print parts much more accurately, but of you can't draw in CAD then this has some merit I think.
  19. I took a few more pictures this evening having sorted the male-mould attachments. The little sticks on top are to tension the wires so that if can't move fore / aft or athwartships, they'll be tacked in-situ to hold them fast for the duration of the cure. I still need to cover the ABS male mould with mould-release spray before setting it up again for the pour. So you can now see how the whole edifice goes together. It's a bit "Heath Robinson", but should do the trick. There'll be an additional sandbag under the plaster-mould so that not all of the weight is being carried by the flanges of the
  20. Isn't the normal method some Tamiya putty and a blunt knife-blade or clay sculpting tool?
  21. Thanks, it's really great to get feedback and suggestions for my videos - I'm no David Lean! I'll try and film the pour, but its likely to be a slow process. Not sure when it will happen as my daughter possibly has Cv19, and we're therefore self-isolated, so rather than popping out to the shops to fetch plastic jugs etc, I have to order from Amazon. Grr! This is all first time stuff for me, so naturally I'm a bit more concerned about not ballsing it up, than I am about filming! I'll try. I need to do some calculations for the weight, but I've bought 20kg of the EP426 which will give me a finis
  22. This may just be me catching up with the 21st Century (some consider I've only begrudgingly entered the 20th!), but I've never seen one of these pens before, much less seen it used by someone able to turn out phenomenal small and intricate parts. A very worthy 30 minute film: https://www.youtube.com/watch?v=29dsCVFI0HM
  23. So, I put my rather questionable wood-working skills to use today making a box to manage the top-heavy plaster/silicone mould which will shortly be used to pour the resin tool for vac-forming the cupola windows. Blimey what a performance! Hopefully this will side-step the possible eventuality of the mould falling over and depositing 150 quids-worth of curing resin all over my workbench/tools/my feet/the floor. This would not have brightened my day. So, after a good clear-up tomorrow to de-dust the workshop as far as possible, the resin-pour should happen soon. The resin needs a complicat
  24. This too will eventually be a 3d-printed model turret kit. Many many hours are now required of CAD, to translate the wireframe into .step files of individual components, and a great deal of work checking the geometry. The FN25 was not a success, although technically it was very advanced. It had two hydraulic rams in the turret, for elevation, and a hydraulic pinion type motor for traverse. Additionally it had two rams to retract and deploy the turret, The gunner stepped down into it once it was deployed, "being very careful not to kick the jettison lever as he does so" (!) - from the manual. A
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