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| Skyediamonds1985 | Guillows Series 800 - Stearman PT-17 | Build | 03-Jul-15 21:09 |  | | Views : 665 | | Just a dash of flat black spray but not too much. Want to allow that silver from the rings to show through for that metallic look. It was at this point I fabricated extra cooling fins for the exhaust side by cutting small sections of extra rings over a small piece of balsa. Then painted a flat gray as seen on the real engine. Besides, it kind of highlights the added detailing anyway. |
| Skyediamonds1985 | Guillows Series 800 - Stearman PT-17 | Build | 03-Jul-15 21:04 |  | | Views : 738 | | Ahem...again. Note the cylinder is starting to take shape. It only took a dash of Spackling compound on top of each end to simulate the valve covers. Again, a quick build without the added hassles of vacuum forming (of which I don't have anyway). I simply cut some extra rings in half and glued them in between the "V." |
| Skyediamonds1985 | Guillows Series 800 - Stearman PT-17 | Build | 03-Jul-15 20:56 |  | | Views : 650 | | Cylinder is starting to take shape |
| Skyediamonds1985 | Guillows Series 800 - Stearman PT-17 | Build | 03-Jul-15 20:52 |  | | Views : 653 | | This photo is only for illustrated purposes as the elongated ring would have been slipped over the balsa support before gluing onto the top of the upper cylinder half. |
| Skyediamonds1985 | Guillows Series 800 - Stearman PT-17 | Build | 03-Jul-15 20:49 |  | | Views : 579 | | This may seem a bit out of sequence, but just using a pin vise over a previously set hole from the use of a T pin, at an apprx. angle to the "V" for the extra cooling fins and support. |
| Skyediamonds1985 | Guillows Series 800 - Stearman PT-17 | Build | 03-Jul-15 20:46 |  | | Views : 556 | | Let's try this again. I'm still learning to post, so sorry about that guys. I should point out that I purposely kept the upper and lower halves of the cylinders apart as I found out (the hard way, of course) that when slipping down the tightly squeezed rings, I kept breaking them apart. So each half had its respective sized rings slipped on. To make the "V: portion, I simply squeezed the rings to form an elongated "O" to suit the size of the two balsa strips used as formers. Again, a bit of fussing around, but still better than the alternate methods. |
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| Skyediamonds1985 | Guillows Series 800 - Stearman PT-17 | Build | 03-Jul-15 20:41 |  | | Views : 564 | | urse) that when slipping those tightly squeezed rings, I kept breaking them apart. |
| Skyediamonds1985 | Guillows Series 800 - Stearman PT-17 | Build | 03-Jul-15 20:34 |  | | Views : 622 | | As you can easily see from my practice sessions against the Guillow's plastic cylinders in the background, all I had to do was slip each "cooling fin" over the appropriately sized dowel. Although the rings were close enough in diameter to the dowels, I still had to open them up a bit to squeeze them over. Still, the rings helped to give a sharp definition to the cooling fins as opposed to thread or string or Heaven forbid, cutting up thin plastic rings. |
| Skyediamonds1985 | Guillows Series 800 - Stearman PT-17 | Build | 03-Jul-15 20:29 |  | | Views : 676 | | Okay so far. Now comes a bit of imagination (at least on my part). What to use to simulate cooling fins? Wrapping threads or strings? Cutting out thin slices of plastic rings? Still thinking of "quick build" I visited the local arts & crafts store and....my cooling fins were neatly packaged and waiting for me. |
| Skyediamonds1985 | Guillows Series 800 - Stearman PT-17 | Build | 03-Jul-15 20:26 |  | | Views : 564 | | Since weight was not a consideration, and plastic tubing isn't readily available in the sizes I needed, I chose hardwood dowels of two approximate sizes for each cylinder. Thinking of it as a quick build, the dowels were already round and sized to suit my needs. I only had to cut them to the approximate size of each cylinder |
| Skyediamonds1985 | Guillows Series 800 - Stearman PT-17 | Build | 03-Jul-15 20:06 |  | | Views : 632 | | I decided early on to use the plastic nose/crank case provided by Guillow's as a quick-build version of the radial. This allows me to focus more on the cylinders and some of the accessories such as intake and exhaust manifolds, spark plugs and their wiring. |
| Skyediamonds1985 | Guillows Series 800 - Stearman PT-17 | Build | 03-Jul-15 19:45 |  | | Views : 605 | | Unique characteristics of the Continental R-670 are: intake and exhaust pipes are behind the cylinders with the main exhaust manifold hidden behind in the nose, the main electrical harness is wrapped around the main crank case behind the cylinders with the front spark plug wiring routed around the cylinders to go behind, the push rods are also behind the cylinders and each cylinder has additional cooling fins for the exhaust. Those were the details I wanted to highlight on the scratch radial. Finally, the engine had to be in 1/20th scale to the aircraft model itself. |
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