Cavu (oz1081)


Cavu (oz1081) by Ken Willard 1938 - plan thumbnail

About this Plan

Midget Cavu (Kenway Cavu). Free flight parasol gas model. This is not a full-size plan, this is a scanned copy of the original magazine pages, inc drawings.

Quote: "Building the Midget 'Cavu'. How You Can Construct a Small 'Convenient' Gas Model That Will Perform Like a Large One. By Ken Willard.

At a time when gasoline model design is showing an increasing tendency for complicated structural design, it will be a distinct relief for model builders with little experience, as well as for the expert, to find a model which is above the average in looks and performance, yet is simpler to build than the majority of rubber-powered models now on the market. The 'Cavu' (airway abbreviation for ceiling and visibility unlimited) was originally designed with that purpose foremost, and the fact was also taken into consideration that a large number of model builders do not have completely equipped workshops. Only the simplest tools are required in the construction of this model; a razor blade, a pair of pliers and other simple tools being all that are necessary.

Upon completion of the model, any builder will find that he has a model which he may well he proud of, both as to looks and performance. The specifications as given are as accurate as could be determined by actual measurement with a stop-watch. The speed of 24 mph was reached with the design propeller turning over at approximately 3200 rpm and by minor adjustments a speed of 27 mph can be reached. However, the cruising speed of 24 mph provides an excellent means for climb and radius of turn.

On its first flight, this model took off from a cinder runway without any aid whatsoever, climbed to a height of 200 feet, flew across the width of the airport, over the hangars and glided to a perfect landing in an adjoining pasture. The total length of the flight was seven minutes, of which two and one-half minutes was engine run. The flight was made at about 7:00 in the evening; obviously there were no thermals to aid the ship in its performance.

Since that time, the ship has completed 53 flights with times ranging from two to fifteens minutes, the length of each flight having been determined beforehand by the amount of gas put in the gas tank. The most gas that has been used to date was half a tank full, or approximately 1/8 of an ounce, which gave the model a flight of 15 minutes and 42 seconds.

With this performance, and the ease of construction, which will be apparent by studying the drawings, combined with the convenient small size and the fact that it can be carried completely set up and ready to fly in an ordinary car, model builders will find that, for purposes of demonstration or sport, this model is unequaled. Its simple though rugged construction makes minor repairs a matter of only an hour or so, and so far as the author can determine a model that can be seriously damaged only through striking some object head on, or being stepped on. Irregular landings (which incidentally are few and far between) caused by gusts of wind so far have no effect upon the model whatsoever.

In other words, fellows, this model's got everything, so let's get going, and by putting in a couple of hours a day, before you know it she will be flying right out of your workshop..."

Supplementary file notes

Planfile includes article pages.


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Cavu (oz1081) by Ken Willard 1938 - model pic


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