Wright Cyclone R-1820-97 Radial Engine

Discussion in 'Aircraft & Aviation' started by Gil, Sep 8, 2004.

  1. Leif Oh

    Leif Oh Member

    Joined:
    Jan 27, 2004
    Messages:
    725
    Likes Received:
    0
    This is very exciting to follow. - L.
  2. bfam4t6

    bfam4t6 Member

    Joined:
    Jun 29, 2004
    Messages:
    317
    Likes Received:
    0
    Wow! It is looking amazing Gil!
  3. Gil

    Gil Active Member

    Joined:
    Jan 25, 2004
    Messages:
    1,981
    Likes Received:
    0
    Developable Cylinder

    Hello All,

    After messing about for some 20 sketches the following is the final cylinder drawing. Approximating the real engine in paper turned out to be quite challenging but the final results were worth the effort. Several test builds were made to test ease of assembly before the resulting final version. More updates as they occur...,

    Gil
  4. Leif Oh

    Leif Oh Member

    Joined:
    Jan 27, 2004
    Messages:
    725
    Likes Received:
    0
    Hanging on to every update. - L.
  5. bfam4t6

    bfam4t6 Member

    Joined:
    Jun 29, 2004
    Messages:
    317
    Likes Received:
    0
    Looking good Gil. Also, any news on the C-47?
  6. Gil

    Gil Active Member

    Joined:
    Jan 25, 2004
    Messages:
    1,981
    Likes Received:
    0
    Update

    Progress Report:

    First thanks for your interest. Dustin, the C-47 will follow the Cyclone and modified cowl for the GPM -17G which will finish that project. The C-47 is next. Development of the R-1820 Cyclone will ease the design process for the Pratt & Whitney Twin Wasp R-1830.

    Besides, I noticed you've got B-17Gs as your avatar..., could this be an indication?

    Below is a 3D shot of progress so far..., pushrods, regulator, sump, ignition distribution and shaft need to be added. What isn't shown is the internal structure which facilitates building the engine without too much fidget. Most of the difficult parts are now complete (means that they've been through Pepakura successfully and test built). Getting the head cooling fins and valve assemblies to look real while making them easy to build devoured a disproportinate amount of time. Developing the Ignition Distribution design has led to a new method for constructing piping (no I'm not going to do an exhaust sytem) not to mention development of domed rocker covers...,

    Need to pass the parts through Illustrator to add a detail, arrange on sheets, convert to .pdf and devlop the build instructions. One other point is the inclusion of the offset regulator for early versions used on SBD and I -16s.

    More as it happens, Gil
  7. Gil

    Gil Active Member

    Joined:
    Jan 25, 2004
    Messages:
    1,981
    Likes Received:
    0
    Alpha Build Begins

    Hello All,

    Design of the Wright Cyclone is now at the Alpha Build milestone. Photos of the build will follow. The screen shot below is the build sheet.

    Best regards, Gil
  8. Leif Oh

    Leif Oh Member

    Joined:
    Jan 27, 2004
    Messages:
    725
    Likes Received:
    0
    This is great. What a fine contribution this will be. - L.
  9. bfam4t6

    bfam4t6 Member

    Joined:
    Jun 29, 2004
    Messages:
    317
    Likes Received:
    0
    This is exciting. It will be a wonderful sprucing up for all of the B-17 kits. This also means that you are one step closer to the C-47 that all of us are looking forward too :D

    Yes Gil, my picture is an indication of what's ahead. I actually started working on the GPM B-17G, finished up the cockpit, and then needed the bubble piece of plastic that sits on top of the fuselage between the windscreen and the nose. I decided my best bet would be to wait a bit and buy either another canopy set, or buy or build a device for vacforming. I messed around a bit with boiling the plastic, but it was already too hard to pull the second it came out of the water. I will get something worked out eventually.
  10. cmdrted

    cmdrted Active Member

    Joined:
    Jul 9, 2004
    Messages:
    1,728
    Likes Received:
    0
    An alternative would be to find a ready made blister from the clear plastic that covers a host of articles that you can buy like candies kids toys cough drops and such. Vacuforming isn't that hard, when this flu epidemic peters out I'll resume the vacuform thread started last month. Anyways good luck.
  11. Gil

    Gil Active Member

    Joined:
    Jan 25, 2004
    Messages:
    1,981
    Likes Received:
    0
    Alpha Build Progress

    Hello All,

    A small bit of progress to report. An important note is that very expensive illustrator board has a tendency to delaminate and does not harden well. Common ordinary "Cheerio" cereal breakfast box material hardened easily becoming not unlike styrene sheet. The illustrator board was used anyway as it is more photogenic than cereal box board...,

    The following photos show the crankcase former and alignment assembly in several stages of being built. The inner spider has to be cut very carefully. Center alignment of the three layers is accomplished with a pin through all layers. Thinned PVA (white glue) was thinly painted on all bonding surfaces and then clamped using miniature close pins. Center hole was cut using a sharpened brass tubing cutter.

    The last photo shows a cylinder former dry fit to the crankcase assembly. The tab on the cylinder former has had the front and back sides sanded into a "wedge" shape which was then hardened with a drop of lacquer to facilate insertion and to resist layer separation.

    Only nine more cylinder formers to go then....,

    Gil
  12. Atomsk

    Atomsk Member

    Joined:
    May 1, 2004
    Messages:
    114
    Likes Received:
    0
    Hmmm, your cylinder assemblies look strangely similar to clothespins...

    OOOOOHH, I get it now. Clever engineering. I like it already.
  13. bfam4t6

    bfam4t6 Member

    Joined:
    Jun 29, 2004
    Messages:
    317
    Likes Received:
    0
    Gil, that is going to be awesome. As always, please show us more when you can.
  14. Leif Oh

    Leif Oh Member

    Joined:
    Jan 27, 2004
    Messages:
    725
    Likes Received:
    0
    VERY nice trick with the formers enabling a saddle shape! - L.
  15. Atomsk

    Atomsk Member

    Joined:
    May 1, 2004
    Messages:
    114
    Likes Received:
    0
    Thanks Leif. That's a very interesting site. I was particularly interested in this early R-1820. It was obviously designed for fixed pitch props, due to the lack of a prop governor. That allows for a much flater crankcase cover, and a shorter output shaft.

    One of the "photo tours" on the site shows that there are a large number of engein exhibits at the Cavanaugh Flight Museum, which is not too far from me. I plan to visit there soon, whith camera in hand. Unfortunately, I'll have to wait for the weekend, since they're not open in the evenings.
  16. Atomsk

    Atomsk Member

    Joined:
    May 1, 2004
    Messages:
    114
    Likes Received:
    0
    Yes, R-1820 powered civilian "Gooney Birds" were known as DC-3s (or DSTs, etc.). Those that mounted the P&W R-1830 had an A suffix added to their designation. They were known as DC-3A, DST-A, etc. Many of these were "drafted" in the early days of the war, and recieved various "C" series MDS designations.

    AFAIK, all C-47s and C-53s used the R-1830 (P&W "Twin Wasp"). Other users of the "Twin-Wasp" were the B-24, and many Wildcats (most F4F and all FM-1). The FM-2 changed over to the "Cyclone".
  17. Gil

    Gil Active Member

    Joined:
    Jan 25, 2004
    Messages:
    1,981
    Likes Received:
    0
    Cylinder Build

    Update:

    Built up a cylinder to test the fit..., kind of a sanity test to see if the 2D geometry is right. The illustrator board frame is covered with 24# copy paper thinned white glue used all around. To put the photo in perspective the total height of the cylinder to the top of the valve boxes is 13 mm.

    Gil
  18. Leif Oh

    Leif Oh Member

    Joined:
    Jan 27, 2004
    Messages:
    725
    Likes Received:
    0
    Hey, that's great! The fins really seem to be there - what a nice pattern! - L.
  19. Gil

    Gil Active Member

    Joined:
    Jan 25, 2004
    Messages:
    1,981
    Likes Received:
    0
    Gear Case Test Build

    News:

    Tried out a new technique to build reverse petal hemispheres. I'll let you be the judge..., The unexpected success of this experimental test build has resulted in a redesign of the gear case housing. The case is about a half inch (13 mm) in diameter.

    Gil

    [​IMG]
  20. Leif Oh

    Leif Oh Member

    Joined:
    Jan 27, 2004
    Messages:
    725
    Likes Received:
    0
    Oh boy, this just calls for further instructions, as you of course realize, Gil! Learning how to shape a thing like this could set a new standard for the whole paper modeling community & industry. - Leif