Time Flies (oz4822)

 

Time Flies (oz4822) by John Krickel 1967 - plan thumbnail

About this Plan

Time Flies. Beginner's control line 1/2-A proto speed model. Simple profile construction.

Quote: "Is there such a thing as a beginners' contest model? Well, the answer is YES, and here is one that holds an official National Junior record as well! Many beginners are discouraged when they visit a contest because all of the events seem too complicated to fly or else require a model that is too hard to build. The Academy of Model Aeronautics (usually called the AMA) sets the rules for contest-flying and has come up with an exciting event intended especially for beginners - 1/2A Prow Speed. This is a flying drag-race, allowing Juniors (up to 16 years old) to use simple profile control-line models.

Let's see how it works: Imagine that you have arrived at your first contest with a new 1/2A Proto model, your little brother is helper. First, you register at headquarters tent and pay your entry fee. At the processing table a judge checks your AMA license; weighs your model and marks the weight on your score card; and then checks the wingspan, area, etc to make sure it conforms to the rules. You report to the flying circle where your contestant's badge lets you by the crowd of spectators lined up behind the rope barrier to watch the competition. Several other junior contestants are getting ready to fly so you decide to watch before trying your luck.

The first boy has trouble starting his engine and barely gets it going before the five-minute deadline for becoming airborne. He fusses a long time with the needle valve setting until the engine is screaming at its highest pitch. The little proro leaps off the ground, and you hold your breath. The model looks even faster than yours! After only a few laps, though, the engine seems to slow down a little.

One of the adult contestants from the speed circle nudges his companion - 'He set the needle too lean on the ground; now the engine is sagging out when centrifugal force builds up'.

You store this bit of information in the back of your mind for future use. Nevertheless, when the time is annouced, it is 64 miles per hour - the top speed of the contest so far.

The next model to fly is decorated with a beautiful paint job, but you suspect it is heavy - and a heavy model is always slower. On takeoff the pilot gives it full UP and the ship almost loops. lie has trouble getting it straightened out. Almost two laps go by before it is flying level about three feet off the runway. It's easy to see that this will be a slower flight. The erratic first laps took up precious seconds of time, and flying too low made the model travel in a slightly larger circle, which also cut down on the speed. It's no surprise, he gets 59 miles per hour.

Suddenly, your heart skips a beat. The judges are calling your name for an official flight! You hook up your new steel lines and the contest director measures them to make sure that the distance from the centerline of the fuselage to the center of your controline handle is at least 42 feet. With lines stretched tightly, they measure exactly right, since you know that every inch longer causes a drop in speed. Next comes the pull test to make sure both model and lines will take the stress of flying. Since half of the speed-reducing drag of the model is in the control lines, you have used the smallest diameter allowed by the AMA contest rules..."

Direct submission to Outerzone.

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Time Flies (oz4822) by John Krickel 1967 - model pic

Datafile:
  • (oz4822)
    Time Flies
    by John Krickel
    from Sig Air Modeler
    January 1967 
    19in span
    IC C/L Trainer
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 11/09/2013
    Filesize: 94KB
    Format: • PDFbitmap
    Credit*: JJ
    Downloads: 1967

Time Flies (oz4822) by John Krickel 1967 - pic 003.jpg
003.jpg

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