Fluf Duf (oz12494)
About this Plan
Fluf Duf. Competition indoor HLG.
Quote: "The Fluf-Duf represents the current state of the art in indoor hand launch glider for low ceiling (35 feet) indoor flying. This model is consistently successful in the hands of beginners and experts alike, and if built as shown in the plans, can be a winner for you.
Light weight is very important, and for anyone who does much indoor hand launch glider flying, knowledge of the site is probably as important as good design. Ideally, a design should be matched to the site it's going to be flown in.
Looking at the parameters of good glider design, the following appear to be useful, and provide a rule of thumb for use:
1. A glider should only be heavy enough to be thrown to the ceil-ing when you give it full effort.
2. A glider should be able to be trim-med to glide in as large a circle as the flying site will allow. Tight turning decreases flight time - the wider the circle, the longer the ship will stay in the air.
3. Good recovery is important. Usually this is accomplished by a fairly forward center of gravity or a spiral climb. In small gyms with low ceilings (35 feet or less), the climb and glide are usually in the same direction, as in this month's 3-view. As ceiling heights increase, the trim can change to a more conventional right climb, left glide pattern. This ceiling height break-off point is somewhere between 35 and 50 feet, depending upon the site. In a very high site, 60 feet or more, the times will usually increase with a right-left pattern, just as in outdoor hand launch glider.
Flying the Fluf-Duf should be such that the launch actually is a high over-head throw which is banked to the right so that the model is arched into its glide pattern. A full-bore, baseball-type throw will not do the trick, unless breaking something is what you intend. Save this method for the more sturdily-built ships and the larger sites.
While on the subject of indoor building and flying, there is a fascinating world of free flight available to you by just giving it a try. Sites are usually more available for indoor than for out-door free flight. Any gymnasium will do. The best ones to look for, if you have a choice, are those which have the highest, unobstructed ceiling, and a wide floor area. Of these recommendations, the unobstructed ceiling is probably the most important..."
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