Gymn Dandy (oz5120)

 

Gymn Dandy (oz5120) by Dan Walton 1987 - plan thumbnail

About this Plan

Gymn Dandy. Indoor CO2 model.

Quote: "Gym Dandy, by Dan Walton. Here's a nifty little design that would prove to be a dandy in the gym or outdoors. It's powered by a Brown Jr Campus A-23 CO2, and is easily built. Trimming is simple, and the flying is a gas!

The Gym Dandy came about as a matter of necessity. Over a year earlier I had purchased one of the new Brown Jr A-23 CO2 engines. Unfortunately, due to extenuating circumstances, I was never able to install the unit in a suitable model. Now, things have settled down a bit, and an opportunity has presented itself for some serious modeling.

The criterion for the design was that it have a wing representative of the Peanut class in span, construction, aspect ratio, and airfoil. The tail surfaces were also to be like those typically found on a Peanut. However, so as not to put the new and valuable engine and the entire project in jeopardy, a very stable model was desired.

So what is more stable then an 'Old Timer' type free flight model? After all, it had to fly indoors in a gym the local club uses in winter. So the fact that the Gym Dandy looks like a Lanzo Record Breaker (oz427) is no coincidence. The wing is held on with a rubber band and allows a very compact storage configuration plus an ability to adjust wing incidence if it should prove necessary. Thus the decision was made. Now off to the drawing board.

A quick search of my tip and tail forms box turned up some old Peanut Scale laminating forms to make suitable tail and wing tips. Wing cord was to be the same as my next planned model. Two and one half inches. The rest was actually quite easy. After about five or six evenings, the model was finished and ready for the next fun fly indoors.

I won't attempt to make this a blow by blow construction article, but feel it wise to give some pointers on the peculiarities of this model.

If you are new to CO2 or Peanut Scale, pick up some back issues of this magazine and read over the Peanut Scale articles carefully. You will probably note that light-weight is hammered upon quite heavily. There is a good reason for this. Heavy Peanuts don't fly very well, if they fly at all. This ship came in at about .47 oz. The same weight as a Cannon CE-9 Super-Micro servo. Most rubber power Peanuts are a good deal less than this. The CO2 engine, light as it is, does inflict a certain weight penalty so you will have to make up for it in the airframe to obtain good duration. Be particularly picky in the tail area. Note also a somewhat short nose moment. This also will help counteract the weight of the engine.

Construction is similar to the more commonly encountered Peanuts with a stick and tissue fuselage and sliced rib wing. Tail surface outlines and wing tips are laminated. If you have never tried laminating before, don't be scared off. It is very easy and results in an ultra-light model. My favorite method is to use indoor grade wood stripped into the necessary width and soaked in hot water for 10 minutes. The form is usually 3/32 or 1/8 sheet with the outside edge cut to match the inner contour of the desired outline. The edge is sealed with wax (I use a dark crayon) and the balsa wrapped around with glue between the layers. I usually can do two layers at a time..."

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Gymn Dandy (oz5120) by Dan Walton 1987 - model pic

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