Falcon (oz1679)

 

Falcon (oz1679) by Paul Plecan from Model Airplane News 1940 - plan thumbnail

About this Plan

Falcon. Free flight gas model, from September 1940 Model Airplane News. This is not a full size plan, this is a scan of the original article pages and drawings.

Quote: "How To Build a Distinctive Stable One Wheeler that Will Turn In Consistent Winning Flights. Building the Falcon, by Paul Plecan.

EVER since the days of Maxwell Bassett and Joe Kovel, gas model builders have all strived towards a common goal - a gas job that would be perfectly stable, climb like a sky rocket, and have a sinking speed so low that it would make a sailplane pilot turn green with envy. Although this month's gas model is not the ultimate in perfection, it nevertheless incor-porates many features that the au-thor feels are necessary in a high-performance gas job.

First and most important is the wing. A moderate aspect ratio (6:1 or 7:1) is used for strength. Although a higher aspect ratio increases efficiency, it also makes the wing more susceptible to folding in two in violent, and sometimes accidental maneuvers. Elliptical tips are used to lessen tip vortices. Little area is used in the center section, as it is not very efficient due to its proximity to the turbulence around the fuselage and wing mount. The Grant X-10 airfoil is used in the wing where the chord and efficiency are greatest, modified Clark Y sections being used at the center and tips for least drag.

Since the fuselage is planked, it is light and strong. The clean design, plus the one-wheel land-ing gear, minimizes drag to a great extent. A large stabilizer is used in con-junction with a moderate-ly long moment arm. To decrease tip vortices, and for genera 1 simplicity, twin rudders are used. The twin rudders give the needed ground stability, since the new rulings re-quire that gas models land without nosing over or falling off on one wing tip.

A high thrust line, bellied-down fuselage and slightly parasol wing mount complete the requirements for stability: The one wheel placed far forward makes nose-overs or ground-loops almost impossible.

Construction of the model is simple, due to the fact that full size ribs, bulkheads and other parts are given. If you contemplate building a Falcon, read through this article and study the plans to familiarize yourself with them before beginning construction.

Fuselage construction begins with the cutting out of all necessary bulkheads from 1/8 in sheet stock. Do not forget to mark off horizontal and vertical centerlines on each bulkhead, because each one has to be sliced along the horizontal centerline before actual construction begins. Bulkhead 1A is 1/8 in plywood, with only two holes (for motor bearers) cut into it. Bulkheads 1 and 2 are cut out as shown in sketch to make room for the rear end of the motor unit.

Draw a centerline on a board about 30 in long and space off bulkheads 1 to 8. All the bottom halves of bulkheads 1 to 8 are now pinned to the board, followed by the cementing of the two 1/8 x 1 in main planking strips on each side. Bulkheads 9 and 10 can now be cemented in place past the end of the board, since they project downwards past the bottom of the main planks. Their horizontal center-lines should be flush with the bottom edges of the main planks..."

Update 20/08/2012: Replaced this with a full size version of this plan, thanks to aeromeddler.

Quote: "enjoying the build. Plans on the Outerzone site are not full size, in fact the not full size bits are about 1/4 scale. I know most reading this thread will be able to scale up the scans themselves but for those who cannot I have full sized the necessary parts and collected the whole lot into a PDF for prospective builders."

Supplementary file notes

Planfile includes article.

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Falcon (oz1679) by Paul Plecan from Model Airplane News 1940 - model pic

Datafile:

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Falcon (oz1679) by Paul Plecan from Model Airplane News 1940 - pic 004.jpg
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Falcon (oz1679) by Paul Plecan from Model Airplane News 1940 - pic 006.jpg
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Scaling

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