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GMK

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  1. GMK
    Asked elsewhere - any pointers for where to obtain references for the Scorpion/Scimitar turret? cheers.
  2. GMK
    During a periodic reference check of contemporaneous photos of ‘my’ M113, I noticed that the engine bay fire extinguisher pull housing was different to the standard one I’d modelled. The standard rectangular one is visible behind the triangular antenna brush guard. Turns out ARN134329 had an oddball one. Also turns out that the exhaust was bent rather than curved. Bent. Also realised that I may have to turn up a flash hider for the 30 cal. The internet provided some decent references from a Canadian work instruction to modify US M6 flash hiders for whatever purpose. Seen here modelled, with the mocked up 50 cal to help with the visualisation. Took some inspiration from @Bandsaw Steve and invested some time to tweak the track shoes & end connectors. Outer face. First tracks are on the printer. Only 15 print batches. Here’s a view of the upper deck & glacis. & a side view. Ignore the track spacing, they haven’t been laid out correctly, yet. Thanks for looking in.
  3. GMK
    The .338 Norma Magnum cartridge case geometry is better suited to machine gun & semi-automatic rifle use than .338 Lapua Magnum. Coincidentally (?), the US, NZ, & Australia have recently adopted sniper rifles is .338 NM to replace their .338 LM systems.
  4. GMK
    I’m looking to CAD up a CVR(T) turret…and don’t have much in the way of references. Really looking for anything atm, dimensions, drawings, angles, that kind of thing. Thanks in advance.
  5. GMK
    They were all a bit hand made, so that doesn’t surprise me! When I was using the T50 turret, the armament was a Browning M2 HB .50 cal & a Browning .30 cal…in 1998! For the model, I’m using Aber turned brass barrels. Thankfully there’s aftermarket WW2 barrels in 1:16. This will be one part of the model that has to interface with someone else’s parts. Another view. Thanks for looking in.
  6. GMK
    I was unhappy with the fit of the roof & glacis, so I merged the bodies for a single print. Regrettably, this is now a proof of concept thanks to the recently discovered turret spacer ring location error. Much happier with the quality of the glacis, too. Having a bit of trouble with the exhaust, caused by the sharp bend in the original. I’ll FITFO that later. After consulting the brain’s trust, I solved the exhaust. In the meantime, the Diehl 513 dual-pin track came in for attention. I’ll be printing these as individual track shoes & end connectors, with 1.1mm metal tubing connecting the track. Haven’t drawn the end connectors, yet. The 1:1 has 61 shoes on the LHS and 62 on the right, for a total of 123 shoes. The scale width of the track is 23.9mm. ‘Dual pin’ means two, 23.9mm-long pins per track, which calcs out to a bill of materials of ~5,879mm of 1.1mm metal rod. A lazy 5.9 metres or 19 feet! That’ll be fun. Thanks for looking in.
  7. GMK
    Too kind, Vytautas. I’m using Fusion360 for the CAD. Did identify some errors with the model, namely the turret spacer ring being located a scale inch too far rearward. This error meant that the physical model’s turret would be located too far to the rear, interfere with the gun depression rail, overhang the cargo hatch, & be unable to rotate. After the fix, which was complicated by having to keep the gun depression rail in the same location. The recesses in the turret & GDR are for magnets to keep the turret on. Of course, now I have to reprint the hull roof! Finally finished the glacis & trim vane. As well as the rear plate. Still need to add the combat door latch, combat door handle, & pintle tow hitch to the ramp, which will finish up the entirety of the back end. Thanks for looking in.
  8. GMK
    First pics.
  9. GMK
    Pushing to finish the design of the glacis, trim vane, & fittings. The headlights, blackouts, & horn took longer than hoped. Progress from a month ago! Thanks for looking in.
  10. GMK
    Work on the glacis is largely complete. As always, details will be printed in resin. The stl render. Sliced into gcode. And…printed. Initial clean up & fit check. The model as is. Almost time to move on to the turret. Thanks for looking in.
  11. GMK
    The roof is now done! After some initial cleanup & test fit on the hull. Design work has shifted to the glacis & trim vane. Thanks for looking in.
  12. GMK
    The first Seahawk fleet - S-70B-2 - comprised 16 aircraft, in service from 1988 - 2017, accrued >88,000 flight hours. No breakdown of land based to shipboard ops. Couldn’t find public domain data on the SH-60R. https://www.navy.gov.au/aircraft/sikorsky-s-70b-2-seahawk “Seahawk has given the RAN more than 29 years of service accruing in excess of 88,000 flight hours,” Using massive assumptions & shonky maths, that’s an average of ~190 hours per aircraft per year. That number doesn’t account for the delivery window (1988-1992), or the long running upgrade program, and how that affected availability.
  13. GMK
    Ack. To clarify, I was referring to the Australian Seahawk experience, which is nil fatalities in 34 years of ops.
  14. GMK
    Very nice work, Steve. Now that PzH2000 have made their way to Ukraine, that could present a possible colour scheme?
  15. GMK
    The Australian navy (RAN) has been operating Seahawk variants since 1988, in both S-70B-2 & SH-60R modes. It has recently ordered a further 13 airframes. Once delivered, that’ll bring their fleet to 36 Romeos. In that time, only one has gone into the drink, with no casualties. Maybe floatation gear isn’t as big a deal as postulated, especially if aircraft reliability is high?
  16. GMK
    The main part of the roof is complete enough to print. Here’s a render of the .stl from a couple of different perspectives. Details such as the footman loops, hatch covers, & the exhaust will be printed in resin. The .stl was sliced in Luban to produce gcode for the printer. Now on the printer. To procrastinate a little more before getting to glacis plate & trim vane, I added the jerry can holders to the back of the hull, either side of the ramp. Well, we’re off to the races with the glacis & trim vane. Thanks for looking in.
  17. GMK
    Design work continues. I’m hoping to get the hull roof & glacis plate on the printer ASAP, so they’re the priority for the design. The most work was the cargo hatch (not quite done) & the driver’s hatch (not quite done - will be a separate print). The last three items for the roof will be the fuel filler cap, antenna brush guards, & the bilge drain. Thanks for looking in.
  18. GMK
    My mistake, it was 369 hours… It also used more than a kilo of filament, so I had to swap the filament once the initial quantity had run out. The printer is pretty reliable. I place a premium on noise & upped the infill percentage more than normal. The result is a long, if very quiet, print.
  19. GMK
    First print is now done: only 369 hours. After cleanup, alongside a print of a model from Thingiverse. With a close up of the two ramps. My model on the left, the Thingiverse model on the right. The delta in size (6% vs. 1:16 scales) & detail are apparent. After some cleanup. Thanks for looking in.
  20. GMK
    Very close to finishing the hull roof. The footman loops are a single part located by two .9mm pins with associated recesses in the roof proper. They help busy the roof quite a bit. The 1:1: The CAD: Also added are the engine deck details & my first attempt at the brush guards for the antennae. Thanks for looking in.
  21. GMK
    Turns out my estimate for the width of the drive sprocket was too wide by 10%. Ah well, at least the redraw is more accurate. As the largest user of M113s, for some reason my unit ran ballistic shrouds on their vehicles. In the Australian Army, most units removed theirs. They change the look & hides a lot of the detail in the running gear. In order to aid indexation of the ballistic shrouds onto the hull, I extruded a lip that’s perpendicular to the hull sides, parallel to the sponsons, & gapped to accept the sponson armour. The bareness of the glacis was starting to bug me, so I figured I’d rough out the engine access hatch cover & the prop shaft access plate. The hatch cover doesn’t sit flush with the glacis plate itself, & is surrounded by a ballistic shield to prevent fragments getting to the engine via the gap between the two. Thanks for looking in.
  22. GMK
    It’s my understanding that the numbers & types of vehicles in the respective Berlin sectors was agreed & known between all parties. The uniformity of the pattern was to make differentiation between specific sub units & the like more difficult.
  23. GMK
    G’day Peter, I’m looking forward to these all becoming physical models. The hull is 168 hours into its print. Regarding the holes in the “Wheel, Sprocket Wheel, Sprocket, Final Drive”, I’ve read similar holes referred to mud relief holes in the context of Abrams, so ported the term across. I imagine they also reduce mass & add strength to the webs that join the hub to the ring. I don’t recall referring to them at all when I was crewing the 113, fwiw! cheers.
  24. GMK
    Managed to sort out the geometry of the sprocket wheel, including the mud relief holes. It was a little tricky. After creating the outer sprocket wheel, I mirrored it to create the inner. The inner wheel is offset by 36 degrees. Another view: Started on the Diehl track. I’ve got two 1:1 dimensions: a width of 341mm & a track pitch of 157mm. Imagine my relief when my 1:16 model conformed to those dimensions! Thanks for looking in.
  25. GMK
    The last pieces of the running gear before the track are the sprocket ring & sprocket wheel. “My” vehicle ran German Diehl 513 dual pin track. 513’s track pitch is different from the single pin T130 & T130E1 normally seen on M113A1s & A2s, necessitating a different sprocket ring. Here’s the sprocket rings for the Diehl track. Ignore the floating! I’m not 100% on the distance between the rings, but good on everything else. A wider view: And a lower one that makes the lack of a sprocket wheel less obvious. This is a pic of a 1:1 sprocket wheel that I’ve been describing. Thanks for looking in.
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