About this Plan
Trooper. Radio control sport parasol model for electric power.
Quote: "A sports model with a touch of the 1930s trainer, designed for geared 400 electric power. Trooper, by Peter Rake.
This model came about as the result of a sketch I made whilst on holiday. I have attempted to make the construction of the model as straight forward as I possibly could, whilst still managing to end up with an attractive end result. This includes making the model a one-piece structure. Don't be put off by this though, she is more than capable of withstanding the bumps and knocks of regular day to day flying. Over the years I have found that simple models often work out to be light models, and light models fly better and suffer less damage than heavy ones. So please, don't be tempted to 'beef up' the structure at all, it really doesn't need it.
Equipment. The motor/gearbox unit is one I hadn't tried before. It is the one that Multiplex suggest for their Hummel model, and very reasonably priced it is, too. For around the £14, you get the motor, gearbox, propeller driver and a propeller. It's true that the propeller is a bit smaller than I would normally use on a model of this type, but if it is supposed to fly the Hummel, then it should be fine. It's easy enough to change if not.
The urge is provided by a pack of 7 x 700AR Ni-Cad cells. That decision was made for me by the need for some nose weight. I would normally use 500AR cells, but I used the heavier 700s instead of adding lead. Don't try to save money by using cheaper cells, it will only work out more expensive in the long run. I have yet to find a cell that comes even close to the Sanyo AR for efficiency and durability.
Control functions on my model are provided by a Jeti 4 micro Rx, two 9g servos, available under various brand names, and a Kontronic Easy 1000 speed controller. This economic and very reliable combination provides us with an airborne control system that weighs less than two ounces and costs very little more than standard size equipment. You could of course use a standard size Rx. and mini servos if they are what you have, but no standard servos please.
So, having dealt with the hows, whys and wherefores of the model, let's get down to some serious building.
Wings. Begin wing construction by building the centre section complete with 1/16 ply dihedral brace. At this stage the brace is nothing more technical than a 1/2 in wide strip of ply. Once this assembly, which should have taken all of ten minutes, is dry, the wing panels may be built.
Before starting construction, notch the spar for the wing tip and taper it down to meet the tip. The taper should only run from the most outboard complete rib. Now pin down and glue together the wing tip pieces, the trailing edge, the spar and the leading edge. Build up the curved, inner section of trailing edge with layers of 1/4 in balsa sheet to match the height of the cut down root rib. All of the wing ribs may now be glued into position..."
Trooper, Aviation Modeller International, February 2001.
Direct submission to Outerzone.
Supplementary file notes
Article pages, thanks to RFJ.
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