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About eweidenh

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  1. Thanks very much! I was looking at the OX-5 and the V-4 while trying to figure out the gear-driven water pump. I didn't run into the handbook, which will be useful. I should get some detailed archival images in January from the CASM/ Ingenium archive in Ottawa. Hopefully those photos will show more detail.
  2. Thank you all very much for your helpful replies! I'll keep digging around for better photos of the water pump. It's a mystery to me how it was mounted, given the surviving motor. I have a further question about the firing order of the cylinders: Do you know whether that was standard at the time? You can deduce part of it as there are a couple of photos that show wires leading from the magneto to the plugs. Also, assuming that the camshaft is intact, I could measure the angle of the rocker arms in the scan.
  3. Second question: There is a row of alternating elements on the top surface of the engine case that are mostly missing from the surviving engine. These appear to be threaded plugs alternating with some sort of adjustable opening. Any idea what these these are for? * Detail from Smithsonian National Air and Space Museum archival photo NASM-CW5G-0917 https://airandspace.si.edu/collection-objects/aerial-experiment-association-cygnet-ii-propulsion-engines-curtiss-v-8-silver * Detail from Smithsonian National Air and Space Museum archival photo NASM-CW5G-0903 https://airandspace.si.edu/collection-objects/aerial-experiment-association-aerodrome-no-4-silver-dart-propulsion-engines
  4. Here is my first question: There appears to be an additional assembly that is missing from the motor as it survives today. It looks to be gear drive--possibly an oil or water pump, though I'd assume that the oil pump would be inside the engine case. It's evident in various photos as a smaller gear above the valve timing gear, roughly in line with the lower portion of the carburettors. Any ideas or information on this? You can see it in the following images: * Detail from Smithsonian digitized journal "Aeronautics" Sept 1909. *Detail from Parkin 1964, p. 126. * Detail from Smithsonian National Air and Space Museum archival photo NASM-CW5G-0911 https://airandspace.si.edu/collection-objects/aerial-experiment-association-aea-aerodrome-no-4-silver-dart-mccurdy-john-d
  5. The engine as it survives today is missing various parts, including spark plugs, electrical cables, cooling water tubing, and (I think) a gear-driven water pump between copper cooling jackets and radiator. I'd like to try to model a more complete version based on some archival research. This is challenging because: 1) The engine was modified pretty radically over its operational life. For instance, the engine that left the Curtiss Factory had one carburettor for each cylinder, one mechanical exhaust valve per cylinder (the intake valve was a suction valve), and the distributor located directly in front of the valve timing gear. The later engine had two carburettors (one per cylinder bank), two mechanical valves per cylinder, and the distributor moved to the opposite side of the engine. I'm more interested in this final configuration. * These are details from Smithsonian National Air and Space Museum archival photos NASM-CW5G-0908 and NASM-CW5G-0917 https://airandspace.si.edu/collection-objects/aerial-experiment-association-aerodrome-no-4-silver-dart-mccurdy-john-d-glass https://airandspace.si.edu/collection-objects/aerial-experiment-association-cygnet-ii-propulsion-engines-curtiss-v-8-silver 2) I haven't found a lot of photo documentation so far. 3) My knowledge of piston engines (not to mention historical aircraft engines) is very limited. I was hoping that some of you pros could help me with some technical questions, or provide suggestions about where to look for archival info. In any case, this topic should serve as a repository of info on this engine, which isn't particularly well studied. Here is how the engine was described in Scientific American on December 12, 1908 (p. 434). This refers to an earlier configuration as mentioned above. The engine of the “Silver Dart” is a 3 ¾ [bore] by 4-inch [stroke] 8-cylinder, water-cooled, Curtiss motor, capable of developing 50 horse-power at 1,600 R. P. M. Including radiator, water, oil, etc. the weight of the complete power plant is 250 pounds, but the engine alone can be stripped to 165. The cylinders are fitted with copper water jackets and auxiliary exhaust ports. Circular concentric valves are located in the cylinder heads, the inlet valves being automatic. The crank-shaft is of specially treated vanadium steel. It is bored out hollow and is 1 ⅜ inches in diameter. The connecting rods are steel forgings, the cylinders and pistons being cast iron. The crank case is made of special aluminum alloy. The main bearings of the crankshaft are continuously flooded with a bath of oil by means of an oil pump of the gear type. Individual aluminum carbureters are employed with all eight cylinders.
  6. Hello All, I'm new here. I hope that this is a reasonable topic for this forum. I'm working on a 3d-printable model of a classic aeroengine--basically an (intermittently) working prototype from the early history of aircraft. This is the Curtiss No. 3, which famously powered Silver Dart, Cygnet II, and various other experimental craft created of the Aerial Experiment Association (AEA) that included Alexander Graham Bell, Glenn Curtiss, and others. The engine first ran on 23 October, 1908 and was used by the AEA through at least February 1909. It was later used in a small fishing boat in Nova Scotia, which sank. The engine was later recovered and now sits in a display case at the Canada Aviation and Space Museum (CASM) in Ottawa. The good people at CASM made a scan of it for me a month or two ago. I've been using that scan as the basis for a printable model. Here's a rough 1/8 version FDM printed version in primer: Here's a 1/25 version in UV-cured resin that I've painted up:
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