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Guillows Series 2000 - P-38 Lightning by David Duckett. Viewed 2104 times.
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Image Comments
David Duckett24-Aug-09 21:24
This was my second P-38.
jrmartinez5927-Aug-09 14:40
GORGIOUS!
Pauli7215-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.
David Duckett15-Jun-12 06:28
These are the plastic ones in the kit.
David Duckett02-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.
David Duckett02-Apr-15 18:39
If it's mechanical, I'm clueless. It is the only kit I've built with props like this.
David Duckett02-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.
rayl02-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.
mark eggebeen15-Dec-18 10:49
Just found out these are “invasion stripes”. Didn’t know that ,
hjlittman16-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.
David Duckett06-Oct-19 12:18
You can do it, Ed!!
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