Gas Bag (oz7994)

About this Plan

Gas Bag. Free flight power model.

Quote: "Gas Bag on Wings. By Steve Kasprzak.

THE OUTSTANDING feature of the 'Gas Bag' is that once it is on the loose it has a tendency, more so than not, to emulate a free roving gas bag. And that means time on your hands. Simple construction eliminates the use of too many uprights and cross braces while at the same time it has been designed for maximum strength. The plans presented herewith are drawn to a quarter scale while other parts are shown half and full. Let's begin by making the fuselage and landing gear assembly.

Both sides of the fuselage are made identical by building them one on top of the other. The whole frame is made from 3/16 square hard balsa. The construc-tion is very simple and should not cause any headaches, however, be sure that plenty of glue is used in each joint.

After the fuselage is assembled cut the fire wall to the dimensions on the isometric drawing. The longerons should extend 3/32 beyond the first up-right.. The fire wall should be notched to fit tightly. It is then fastened in place with plenty of glue. The landing gear is bent from 3/32 dia piano wire to the dimensions given on the isometric drawing. After this is done a piece of hard 3/32 sheet is cut to fit the inside of 'U' bend of the landing gear. This piece is then glued to the fire wall so that the upper section of the U bend in the landing gear is wedged between bottom of the motor bearers and the piece of wood itself. This distributes the shock of a hard landing to the rest. of the fuselage.

When this piece of wood is secure and the landing gear is fitted around it, another piece of hard 1/8 balsa is cut so that it covers the wire of the landing gear on the three sides. It is mportasst that the grain of this piece of wood runs across the width of the fuselage. Many coats of glue should be applied all around the landing gear. The motor bearers are pushed through fire wall and glued to the inside of the fuselage and trussed up as shown on Plate 1. The cowling is no more than a sheet of medium hard balsa. 3/16 thick cut to the proper shape, with the grain running up and down. The under cowling is made by cracking the sheet to fit the curve..."

Quote: "Here's the Gas Bag that Tony (fizzlestik) started the build thread on. As always, interesting scaling on this plan: If you build from it, apply the old adage: Measure twice, cut once! Chuck"

Update 29/08/2016: Added scan of original drawings (unscaled) thanks to TonyC.

Supplementary file notes

Article pages, text and pics. Also, scan of 2 drawing pages as printed.

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