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Edgar

Sadly Missed
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Everything posted by Edgar

  1. The "Meredith effect" was known in 1935, when Meredith published his paper, "Note on the cooling of aircraft engines with special reference to ethylene glycol radiators enclosed in ducts," in which he said that he believed that, at speeds over 300 mph, a net thrust was possible, but trials were needed to ascertain this. It seems likely, looking at the design of the Spitfire radiator, that Mitchell took note of Meredith's work, and incorporated it. There is a school of thought that the Spitfire did achieve thrust, eventually, or, at best, was "drag neutral," but I haven't found any test reports on that score. Meredith used the same theory in his "Invention relating to the jet propulsion of aircraft," even earlier in 1935, for which D.D.S.R. reckoned that the Air Service could not find a use; did they ever get that one wrong!
  2. 1/. Probably, since the plastic seat didn't enter the production line until mid-May 1940 2/. No. the armour on the firewall was probably fitted pre-war (though an order/mod remains stubbornly missing,) the armoured glass was fitted around the time of Dunkirk, the headrest armour was fitted in February 1940, and the behind-the-seat armour was fitted, airfield by airfield, from June 1940, with priority going to those in the south of England. 3/. Oleo legs, initially, were painted silver, never left in natural metal. 4/. Door interiors were silver
  3. Didn't think it helped much:-
  4. I don't have dimensions, but the compressed length appears (hah!) to be half the extended length between the two locating holes in the wing's upper surface.
  5. There's an American expert on racing aircraft, and their design, who is highly dismissive of the Spitfire, reckoning that it could have been much faster, and should have been fitted with a curved windscreen. He's probably unaware that curved screens were tried, on a V & the RV VIII, but were rejected because distortions, caused by the curved glass, meant that, at times during simulated combat, the target disappeared from the attacking pilot's view.
  6. Seafire R/V hoods were smaller than the Spitfire type, but solely because Westland's tool couldn't produce them to the same size (sorry, but I have no idea of by how much they differed.)
  7. These come from the IX A.P. Note that it was expected that aircraft carrying wing bombs should have extended elevator horns, Mk.XII pointed rudder, and four-spoke wheels.
  8. The drawings just call for a grey primer, and a wartime paint list simply shows a dark grey and light grey, both being suitable for cellulose or synthetic finishes on surfaces other than fabric or magnesium alloy. The cockpit grey-green was also a top colour, not a primer; it, too had to have a grey primer.
  9. This is a presentation aircraft "paid for" by the Belgian Congo Fighter Fund, so I think that you should not just consider the bit that you can see. The fuel tank cover runs from frame 5 back to the cockpit, so it's entirely possible that the deflection armour was first removed, then the whole panel replaced (for whatever reason,) and the armour refitted over the top, keeping the donor's name intact. It was standard practice for spares to be supplied in primer (grey for the Spitfire,) which seems (to me) the likeliest possibility.
  10. The Merlin 45 was identical to the Merlin III, except for the carburettor intake being fed into the centre of the blower; Airfix never did that lot of work, so you can forget it. If you don't want a very early Mk.I, with the push-me-pull-you u/c retraction, the later version is on the Vb sprues, and the kit should also have more choice with the cockpit canopy.
  11. A draft copy was sent to the Under-Secretary-of-State 10-4-40, and the D.T.D. replied 15-4-40, saying that the Air Staff had approved the circular, and it would be sent out in a few days, so it seems fairly safe to assume early May for its despatch and receipt. Serby also suggested that "dope firms" should get a copy, and the D.T.D. didn't demur.
  12. Edgar

    Stencil or roundel

    The "national markings" were always supposed to be inviolate; when the orders, for the D-day Stripes, was issued, it specifically said that they were not to encroach on the markings (didn't stop it happening, though.) It seems that the underside markings did encroach, at times (the Spitfire's "trestle" markings are an example,) but that might be due to them being underneath; top side walkway lines and stencils were definitely not to encroach.
  13. Further information just received:- "Edgar I spoke yesterday to a friend of my late Mums who worked in the Spraying shop in Skeltons Lane E10, this was also part of Wrightons Aircraft. Although she tells me her memory is rather weak once we started talking a lot of memories came flooding back. As to the use of mats she said that she seems to remember that the hides were not fully tanned so that after time the hide would take the shape of the fuselage conforming to all the curving parts. These are my words based on what she told me. She also remembers the change over to smooth paints which at the time was not as easy at it seems lots of painted fuselages were rejected resulting in all the sprayers being sent back on courses to learn how to use the new paints. Another down side to working there was not only the bad smell which she remembers really well she also said that many workers also suffered from skin rashes. No Health and Safety those days she did not get a spray mask issued till after 1945.(She still has this somewhere). Due her to age I did not push her too hard but she has promised to sort out some picture taken at the time for next time I will pop round She also told me She enjoyed recalling these times so she thanked me for asking."
  14. On some photos there's a stamp visible, which reads "MOD 817." This mod was on the IX, only, aimed at rudders of metal, rather than wooden, construction, and incorporated new hinges. As it dates from March/May 1943, it's a strong contender. They remain a mystery; on the "Mk. XII" rudder, "frames" were doped over the positions of the trim tab pivots, but they were both sides, top and bottom, and that doesn't match with the photo, or the rudder type.
  15. It rather needs a little lateral thinking, since Supermarine drawings advocated interior areas (except the cockpit and engine bearers) should be silver, but it's a rather moot point if you consider the wheel wells to be interior areas, or not. Oleo legs and door interiors started off silver, but anything could (and did) happen in the first two years of war. Given that the Defiant, Hurricane and Typhoon wells were all silver, I tend to go with the idea that the Spitfire would have been the same (cue photo of Spitfire with black & white wells,) but the block and noose are now obsolete, so it's really your choice.
  16. I've just received this, via PM, from a member, who wishes to remain anonymous, and, seeing the angst that this has, at times, generated, I can't blame him:- "My late Mum worked on the Mosquito at two locations in East London. The first in Leyton E10 were she was trained as a sprayer. Later she worked in Walthamstow E17 at the Wrighton Factory I have a photograph of her and work mates sitting in front of the 1000th Fuselage built there. Now for the reason for sending this by PM.She told me that she could not get on with spraying as the smells that came off the HIDES that were used as Mats used for masking the Fuselage! My mother worked in Leather trade both before and after the War so she did know a lot about Leather from hides to Brief Cases used by the City toff. The smell given off these hides was as she explained because they were not top quality and were in fact not fully tanned so mixed with paint and thinners gave off a the terrible smell. I have avoided posting on the Rubber Mats thread as it throws out another idea for some to pull apart and as I do not know if this was used in other factories or just where she worked I now have no way of knowing. So yes I agree with you Mask were used what ever they were made of."
  17. And one of the reasons I don't like it is because the effect stops where a decal begins, then restarts where the decal ends, which loks daft. Then don't use an airbrush, and use a different medium; I was influenced by Peter Cooke, whose method used Designer's Gouache (a water-soluble tube paint) over his enamel finish. He would smear it all over the (finished) model, decals and all, then use a saliva-moistened handkerchief, and wipe in the direction of the airflow. This has the effect of imparting a subtle streaky finish, and leaves a slight build-up in panel lines across the airflow, but none in those that follow it. The colour used was often black, but could be changed to suit the terrain/camouflage; oil leaks could be simulated with a dot of brown "pulled" by the damp cloth (saliva might sound disgusting, but it seems to have a stickiness about it, which helps the gouache to stay put.) The beauty of the whole idea was that, if you didn't like it, a wash with clean water would remove it, and leave a clean "slate" to start again.
  18. Painted silver; leaving anything unpainted, in our climate, is not recommended.
  19. Eduard do have wide bulges in at least one version of their IX, and John Adams (Aeroclub) does (did?) a set of IX improvement parts, V230, which includes two rudders and three sets of bulged covers.
  20. According to Ted Hooton, "Scale Aircraft Modelling" November 1982 (it's really worth getting a copy for the rest of the information) it was even-numbered serials "A" scheme, odd "B," except for:- K9787-9882, K9888-9891, N3160-3203, N3264-3295, P9557-9565, R6751-6780, R6799-6800, R6804-6818, R6829-6840, R6879- possibly 6880, but certainly R6904 which were A odd/ B even. Castle Bromwich A even/B odd: P7350-7389, 7490-7509, 7590-7629, 7730-7759; A odd/B even: P7280-7329, 7420-7449, 7520-7569, 7660-7699, 7770-7789. Supermarine deleted the mirror type scheme from 26-4-41.
  21. The leather might well have been basil (sheep) leather, as used in some areas of the Spitfire, so could have been dyed; with several million pairs of army boots required, cow leather could have been rather scarce.
  22. The prototype Spitfire was built from anodised aluminium, which probably had something to do with the greenish colour when it first flew. When Spec 16/36 was issued 28-7-36, out of 33 changes/improvements decreed by the Air Ministry, one said that the fuselage and wings could be covered with Alclad. Wheel wells and gunbays were painted silver, and probably remained so on the Hurricane, since the Typhoon was the same, but the Tempest went over to green. The Spitfire might have gone to green around 1943 (MH434's fuselage interior is green, as were the Mk.22's wheel wells.) As for standardisation, drawings were made, printed and modified by the drawing office, and large parts were built on jigs, making them interchangeable. Westland's (now retired) historian worked in their drawing office during the war (and after,) and he told me how Westland's and Supermarine's removable panels were always interchangeable, but Castle Bromwich's were "made to measure," so unique.
  23. Why this obsessive desire for me to praise the models of others, and why the implication that criticism wouldn't be welcome? My view of any model, as a modeller who was never any better than average (and who only won a class at the IPMS Nationals when there were only three entrants) means absolutely nothing. I am a retired factory worker, who now spends time as a researcher, and am not, nor have I ever been, a master model-maker. Modellers build for their own enjoyment (with the odd exception, who builds to compete,) which, in a hobby, is as it should be, and they don't need a rank amateur sticking his oar in. I have friends, on and off this website, who cheerfully send photos of their work, and ask for my honest comments, because they know they won't get sycophantic praise or a fearful lambasting, but an honest appraisal from what I know about the real thing, and the way it was really painted and looked after.
  24. I mean only that the aircraft had wing stiffening carried out. As far as I know, the Vb only had two wing stiffening mods; there was 455, which added only 4.8 ounces in total (which implies only a thicker grade of aluminium,) and 532 (which cancelled 455,) which added 6.3 pounds, and incorporated the over-wing stiffeners. There is no record of 532 being withdrawn, or cancelled, and there are aircraft, here, which still carry the strakes, which implies (nothing more) that the mod remained.
  25. I concur with Mr. Roberts. In fact, "early" or "late" should probably only relate to the date, since aircraft had a rolling system of modifications, which were supposed to be incorporated during the life of the airframe, and especially during major overhauls. Any "early" (i.e. 1942) Mk.IX, which survived to post-D-day, would probably have had Mk.III I.F.F., broad-chord rudder, tropical intake, extended-horn elevators, narrow cannon bulges, gyro gunsight, plus sundry other minor mods, thereby qualifying for the appellation "late."
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