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| David Duckett, Comment for image # 13831 | 06 Oct 19 12:18 |
| You can do it, Ed!! |
| hjlittman, Comment for image # 13831 | 16 Dec 18 16:51 |
| Counter rotating props were not a problem for Allison engines. The original V-1710 was intended to replace the Maybach diesels in Navy Zeppelins and was designed to be able to be stopped and reversed in flight. In the later production engines the direction of rotation could be changed by simply reversing the cam shafts end for end, putting an idler gear in the accessory drive, rearranging the ignition wiring, retiming the engine and installing a different propeller. It was simple enough to be done in the field.
Multi engine airplanes do not need counter rotating propellers to avoid torque problems unless they are intended to do aerobatics on the rolling plane, like the P-38. If you don't believe this, build a multi motored rubber powered model with the propellers turning in the same direction and try to get it to not fly straight.
One persistent misconception about the Allison engines is that in remote installations (P-39, P-63, XFL, FM-1, B-42) the drive shaft turned at crankshaft speed. There was a 2:1 set of reduction spur gears behind that flat front engine cover. The remote gear box was to raise the thrust line for the fighters that had cannon firing through the prop hub and to contain propeller pitch controls and gun synchronizers. I have the maintenance manual. |
| mark eggebeen, Comment for image # 13831 | 15 Dec 18 10:49 |
| Just found out these are “invasion stripes”. Didn’t know that , |
| rayl, Comment for image # 13831 | 02 Apr 15 19:52 |
| The P-82 Mustang also has counter rotating props with distinct engines and gear cases. Funny thing: the Engineers originally designed the plane with the props turning so that met on the upward sweep in the center wing area. After the prototype failed to get off of the ground for several test flights the drive-trains were switched side-for-side and the problem was cured. It was calculated that by turning the props in the original direction, they were canceling out the lift of the wing center-section, which was about 25% of the wing's total lifting area. |
| David Duckett, Comment for image # 13831 | 02 Apr 15 18:59 |
| Yeah, and I would bet that's exactly why nearly every other plane avoided them. Engines are constantly being replaced so it makes sense that they fit in both sides the same. |
| David Duckett, Comment for image # 13831 | 02 Apr 15 18:39 |
| If it's mechanical, I'm clueless. It is the only kit I've built with props like this. |
| David Duckett, Comment for image # 13831 | 02 Apr 15 18:11 |
| There's a difference in counter-rotating and contra-rotating props. The P-38 and the Wright Flyer have counter-rotating propellers. The de Havilland did, as well, and there are a few civilian light aircraft which do. The only four engine plane which had them was the German Gigantica, according to Wikipedia. |
| Pauli72, Comment for image # 27365 | 29 Sep 12 11:19 |
| :-) |
| David Duckett, Image # 27365 | 29 Sep 12 08:03 |
This is one of several Guillows ,odels in the museum. This one seems appropriate for Poppy's visit:-) |
| David Duckett, Image # 26637 | 15 Jun 12 10:28 |
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| David Duckett, Comment for image # 13831 | 15 Jun 12 06:28 |
| These are the plastic ones in the kit. |
| Pauli72, Comment for image # 13831 | 15 Jun 12 01:16 |
| David, did you carve these propellers yourself,or are they the 2 piece plastic ones from the kit? Either way they look awsome! Just curious. |
| Pauli72, Comment for image # 26636 | 15 Jun 12 00:51 |
| RedRum! RedRum! LOL! Thanks David. I rememberd seeing some pictures of "Yippie", the 5000th P-38 off the assy line, while I was doping mine with streetwalker red. |
| David Duckett, Image # 26636 | 15 Jun 12 00:11 |
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| deckape, Comment for image # 22091 | 09 Apr 11 22:12 |
| The Fork Tail Devil and the tigercat flying low over the water. VERY VERY Nice diorama on the Dynamic dual. HARDY WELL DONE. |
| Roring40, Comment for image # 22091 | 09 Apr 11 20:07 |
| Brings a tear to the eye. What a brilliant picture ! |
| David Duckett, Image # 22091 | 09 Apr 11 16:50 |
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| intruder 1400, Comment for image # 20922 | 03 Feb 11 13:28 |
| Tissue covering can be a nightmare, it's all trial and error, the longer you do it the better you get at it. I have learned the bigger the pieces the better it turns out, less wrinkling when you shrink and less glue lines that will show. Any favorites for the SuperBowl this year ? I am going with the packers even though I don't like them, I don't want the steelers to get 7 rings. I am a cowboys fan. |
| lukebozek1, Comment for image # 20922 | 03 Feb 11 06:28 |
| I just finished a crane project at a steel company in Thomasville Georgia. I hate doing covering, but i did learn that prepping the framework was the key ingredient. That and an umlimited supply of tissue. |
| intruder 1400, Comment for image # 20922 | 02 Feb 11 20:41 |
| Thank you lukebozek1, this P38L was my first of the 3 big birds I built and of course the other 2 turned out better, I guess you get better with each build. No I don't work on a fishing boat, I am a structural steel estimator at Allied Steel Construction here in town, been there for almost 17 yrs now. I have to tell you I was quite blown away when I found out I won the contest with my B-17G, I just put it in the contest for people to see, had no expectations of winning. Keep at the covering you will get better at. |
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