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Everything posted by DerekB

  1. OK, work on the physical model has slowed to a crawl, but some CAD work is still happening... The rear seat in the Wirraway can spin around and face reverse, so the observer can use the rear gun, sight and shoot the camera or lie on the floor to use the bomb-sight. To do this, the rear seat is mounted on a complex frame with a rotating mechanism at the centre of its base. Here is my almost-complete CAD model of the frame, soon to be sent to Shapeways for them to do their magic. Wirraway 32 rear seat frame CAD model by Derek Buckmaster, on Flickr And here's a view of the actual seat framework in A20-10: P1040098 by Derek Buckmaster, on Flickr
  2. Great to see you working on this subject Chuck, I have four of these kits, all destined to end up somewhat modified. So I'm very interested to see what you can do with this one. Great choice of subject too! I'm always amazed to see kit manufacturers coming out with so many inaccuracies in their kits... some are understandable if the subject is rare or poorly documented. But with so many Texans and Harvards around, the mistakes in this kit are unforgivable!! The tail-wheel detail by KH is stupendously poor, and I noticed your solution based on Max's fine work. Since I have 4 of these kits, I've been working on a 3D printed solution to the tail-wheel "knuckle", see my photos below for how it should look: Harvard tail wheel collage by Derek Buckmaster, on Flickr You can see the shape of the fuselage cut-out and the triangular shape of the "knuckle" when viewed from below. It was nice of the Imperial War Museum (Duxford) to hang their Texan up in the air to enable lots of photos of the underside, which you can't normally get! Also, the amount by which the tail-wheel protrudes from the fuselage is due to the fuel and crew load, not related to the position of the tail-wheel. Since the tail-wheel is sprung with an internal pneudraulic cylinder, if the fuel tanks are full and there are 2 pilots on board, the tail-wheel doesn't protrude much at all. In the photos above you can see that with no load on the wheel it is fully extended. Cheers, Derek
  3. splendid work on the model Max. That prop looks like it's ready to slice off a finger!
  4. That looks excellent Max! Great work, and lots of innovative solutions!
  5. OK, work has started. I've added some stringers to the insides of the fuselage side panels and started some interior green painting. And now some playing around... here is the Kitty Hawk Texan kit with a set of CAC Boomerang wings from the cool Alley Cat resin kit... this gives an idea of where this is going... P1080728 by Derek Buckmaster, on Flickr The colours of VH-SNJ are exactly as shown for RNZAF colours in the Kitty Hawk kit. OK, no, I'm not really going to donate the wings from my Alley Cat Boomerang! I'll be converting the Kitty Hawk kit wings to match the Boomerang wings...
  6. Starting another build based on the 1/32 Kitty Hawk Texan kit... Back in 1993, Guido Zuccoli fitted a pair of CAC Boomerang outer wings (built from detailed drawings by Matt Denning) to his Harvard III VH-SNJ! According to Matt, this resulted in a "Hotrod" Harvard which had 10% faster cruise speed, 50% faster roll rate and aileron deflection loads 40% lower! Below is a drawing of a standard Harvard III with the Boomerang outer wings overlaid... Harvard with Boomerang outer wings fitted by Derek Buckmaster, on Flickr Apart from the swapped outer wings, the aircraft was stock, and painted in its original RNZAF colours as NZ1085. Luckily the Kitty Hawk kit includes RNZAF markings, so the fuselage and wing centre section will be quite straightforward and OOB. The canopy framing will need to change.
  7. Max, yes, the Wirraway and the Harvard I shared the same wing design. The conversion of the KH Texan kit to a Wirraway requires lots of surgery, but it's the only thing close in 1/32 scale, so it's a useful starting point. My build log is here: I'm still researching for the other two KH Texan kit builds, so I'll start the build logs for those soon...
  8. I should also have explained that I'm working on 3 of these kits at the moment. Two as Harvards and two as Wirraways. If that doesn't add up, that's because one of the Harvards is a Wirraway. And that statement will make sense when I put up the build logs on these particular models...
  9. Nice work on the tail wheel Max - it's hard to imagine how KH could have got this so wrong on a 1/32 scale kit!
  10. Hi Paulo, actually, my project is an Australian civilian-operated target towing Mustang, with a second seat and target winch installed behind the pilot. Luckily this conversion used a standard canopy. Here's a link to the (slow) build log: https://forum.largescaleplanes.com/index.php?/topic/75745-aussie-target-tug-mustang/
  11. Continuing my preparations for this build... Firstly, I decided that the Hasegawa kit's sparse cockpit details were not going to cut it, since most of the focus for this model is around the cockpit and the modifications for the target towing gear and rear seat. So I sourced a cockpit sprue from the Tamiya P51-D/K Pacific Mustang kit from eBay. Second, I needed better seats, so I purchased two Barracuda Cast seats. So far I haven't found any photos showing the interior of VH-BOZ in target towing configuration, but these seats will be a good start. Third, I picked up an excellent set of photos of VH-BOZ from "The Collection" (search for them on eBay), selected by David Muir, author of Southern Cross Mustangs. These are all very useful. I'm currently working on a 3D CAD model of the Type B towing winch, so that I can get one printed by Shapeways...
  12. I'm enjoying watching this Paolo, as I have to add a rear seat to my Mustang project (although facing rearwards, since the second seat was to operate the target towing winch). Nice work on the two-seat conversion!
  13. Looking fabulous Eric! Curious reversed CAC lettering on the right hand side speedbird. But then I checked, and that's how it comes in the kit!
  14. Nice one Eric, wish I had one of those! Enjoying this CAC build very much!
  15. DerekB

    RAN A4G

    very sweet work Chris. I was admiring two of these birds in the flesh at Nowra just 3 days ago.
  16. Wonderful work Eric! I'm a big fan of 1920s/30s race planes. Imagine if this had flown! The pictures of this machine "floating" almost fully submerged are mind boggling!
  17. Some small progress this evening from aboard my floating workshop... Here's my "production line" for 1/32 scale Pratt & Whitney R-1340 Wasp engines. I need 2 complete geared engines (one for the Wirraway and one for a Ceres). On the left is the engine from the Kitty Hawk Texan kit, with all the cylinders molded integrally with the crank-case. I'm building this as a test-piece for colours and weathering. On the right are the two resin engines from Vector, with the 3D-printed gear reduction drive housings in front. P1080572 by Derek Buckmaster, on Flickr The 3D printed propeller hubs are back from Shapeways, and here is my "production line" for the Hamilton Standard 3D40 propellers: P1080573 by Derek Buckmaster, on Flickr The nose of the Wirraway is quite different to the later Texan. I need to remove 9mm from the equipment bay to fit the new "dish-pan" at the rear of the cowl. Here I've marked the section to be removed: P1080574 by Derek Buckmaster, on Flickr
  18. In addition to getting 3D printed parts from ShapeWays, I'm also experimenting with using my home-made Tevo Tarantula printer to print some parts at home. The Tarantula is a kit which you assemble yourself. I purchased it via a web vendor in China for about A$395. Being a low-cost printer with only about 0.1mm resolution (layer thickness), I don't expect to be printing complicated parts (I'll save those for SW), but there are still a few less complex parts which should be doable with the Tarantula. Here you see an almost-finished print of the engine "dish-pan" which covers the engine mount. This is a simple part with features that I'll scribe and glue into place. IMG_7356 by Derek Buckmaster, on Flickr
  19. Spent some time looking for better blades for the Hamilton Standard prop. The blades in the Kitty Hawk kit are far too thick, so I hunted around for some alternatives to better match the HS 6101A blade as shown in the photo below. On the left (silver) is the Hamilton Standard prop from a Monogram Grumman Gulfhawk II kit. The shape is better than the Kitty Hawk kit prop, but the diameter is too small. In the middle (bluish grey) is the Kitty Hawk Texan kit prop, too thick and with an oddly tapered root section. On the right (brownish resin) is a Quickboost after-market resin blade from a Mk.Vb Spitfire. This was a Hamilton Standard propeller made under licence by deHavilland, and the blade shape correctly matches the 6101A drawing shape. HS 6101A blades 2 by Derek Buckmaster, on Flickr
  20. The next part to get the 3D printed treatment is the Hamilton Standard propeller hub. I decided my attempts to kit-bash the 2-bladed Hamilton Standard 3D40 hub from the Texan kit into a 3-bladed 3D40 hub weren't going to satisfy me. After looking at the possibility of substituting a 3-bladed hub from a couple of different kits in my stash (Williams Brothers Seversky P-35 and Monogram Grumman G-22 Gulfhawk II use the same hub) I still wasn't happy, so I've drawn up the 3D40 hub in TurboCAD and sent the STL file off to Shapeways... 3D40 hub 02 by Derek Buckmaster, on Flickr
  21. The 3D printed reduction drive housings have arrived from Shapeways, and I'm very pleased with the results... IMG_0311 by Derek Buckmaster, on Flickr On the left is an unpainted 3D printed housing, in the middle is a painted version and on the right is the crank-case for a non-geared Pratt & Whitney R-1340 Wasp engine from the Vector resin kit. The ribs and bosses on the 3D printed version look fabulous. The 3D printed part will now be attached to the front of the resin crank-case, after removing the non-geared front housing detail. The unpainted 3D printed part on the left also has nuts added (as shown in the 3D model above), but they're not visible in the unpainted state.
  22. I've been looking at the Wasp R-1340 engine in the kit, and I'm thinking there must be some way to do better than this. The induction system on the back is all wrong, the spark plug leads are molded onto the front of the cylinders, and the fin detail on the cylinder heads is poor. I picked up a Williams Brothers Gee Bee R, and that has a nicely detailed engine. So that's an option. But then I picked up several Vector resin engines, and these are little works of art! So I'm planning to use one of these. But in all three cases (the kit engine, the Gee Bee R engine, or the Vector engine) these are non-geared Wasps, so I need to do something about the reduction-drive housing on the front of the Wirraway's geared engine. This is a tapered housing, with lots of ribs and mounting bolts. Since I'm going to need several of these engines (at least one Wirraway, plus a Ceres) I decided to model the reduction drive housing in 3D CAD, and I've loaded this onto Shapeways and the first piece is being printed as I type. Here's a look at the CAD model: PW R-1340 reduction drive housing assy by Derek Buckmaster, on Flickr If this works OK, I'll model up some more components to be used...
  23. Spent a couple of hours in the reading room at the RAF Museum in Hendon (London) yesterday, so now I have copies of a full set of manuals and details for the Type B target towing winch, including the drawings below. IMG_7249 by Derek Buckmaster, on Flickr Muir's Southern Cross Mustangs book shows details of the external section of the towing winch, but nothing about the internal part. This collection gives me all the detail I need for the section of the winch inside the cockpit, so now I just need to scale this to 1/32 and start work on building it...
  24. Maru, yes, I can understand the confusion! Derek B from UK (not me) and Derek B from Australia (me)! And to cap it off I'm on vacation in London for 2 weeks at the moment, so Derek B from Australia is in the UK!
  25. Lovely work Brad! I love those golden-age racers. I built the same kit as a teenager, but didn't have the patience to paint the thing!
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