Nimbus (oz524)

About this Plan

Nimbus. Free flight power model. Streamliner.

Quote: "Building the Nimbus Gas Model. How You Can Build and Fly a Super-streamlined Gas Model of Great Flight Efficiency. By Benjamin Shereshaw.

In the building and flying of the Nimbus, one takes upon himself an advanced gas model project. This model is not recommended to anyone attempting his first gas buggy. The Nimbus in every line illustrates very advantageously the importance of streamlining and clean design. It will fly with the engine barely ticking over and it is almost impossible to describe its flat glide and shallow sinking speed after the engine has conked. At a recent gas model contest the engine ran about two minutes, yet the ship soared from sight at nine minutes. It is a plane of which yoo can well be proud when it is completed.

Fuselage: The first step in the construction of the fuselage is the cutting and building of the bolkheads. The best grade of model cement should be used throughout the entire construction. A series of clamps or heavy weights should he on hand for use in the lamination of the bulkheads. The nose bulkheads Nos 1, 2, 3, 4, 7 are made of two laminated sheets of medium grade balsa. The grain must run at 90 degrees. Cement the sheets together and lay them aside to dry for at least three hours before cutting them to their elliptical shapes.

You will notte that bulkheads Nos 8, 9, 10, 11, 12, 13 are hollowed to decrease the weight in back of the center of gravity. Throughout the entire building of this model. decreasing and saving weight behind the center of gravity should he of paramount importance in the builder's mind.

The greatest degree of accuracy must be used in the cutting of the notches for the four main longerons and motor mount bearers. The stringers are cut after the main longerons are in place and fuselage lined up.

The next step is the actual assembly of the fuselage. Select four hard balsa longerons of even texture and even bending qualities. In the selection of the wood, all longerons must have the same bending characteristics. The longerons are then marked at every point where they attach to bulkheads. It is best to take the two tipper longerons together and mark both at the same time. This also applies to the lower longerons. Insert the two upper longerons in the notches first and allow the glue to set. Follow the same procedure for the two lower ones. The insertion of our diagonal braces from bulkhead to bulkhead must not be forced to fit into space as they are apt to distort the fuselage.

The motor mount hearers are then slipped into position. Be sure that the negative thrust angle corresponds to Illustrated Plate No 1. Allow this to dry from six to eight hours.

Landing Gear: The landing gear members are made of 1/8 in diameter steel piano wire. Scale the front view showing the landing gear dimensions to full size and bend strut A and axle accordingly. These members are then placed below the lower longerons and against bulkhead No 2. Wrap with two layers of No 8 thread. It will be necessary to use a heavy needle to sew through the bulkheads. A generous portion of cement is then applied to the thread wrapping.

The rear strut 'B' is then bent to shape and wrapped to strut A with fine copper wire as illustrated on Plate No 1. The shock or tension, strut C is bound to struts A and B with fine copper wire. The entire joint is soldered with resin core solder..."

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