Ugly Twin (oz9481)

 

Ugly Twin - plan thumbnail image

About this Plan

Ugly Twin - Radio control twin sport model. For 2x OS Max .40 engines.

Quote: "To start building this model, first read the plans. All of the materials listed (not necessarily in alphabetical order) can be found in most hobby shops in moderate supply. In keeping with everything else you want to buy today, you may have to substitute bed sheets for covering, since silk is incognito! But, please do not break up the furniture to replace balsa. Wives and mothers frown upon this. I am sure these emergencies can be taken care of as they appear. When you have all of the knotty balsa wood and warped plywood, along with assorted spit and bailing wire assembled, construction may begin.

Some people like to build wings and hate fuselages, while some like to build fuselages and hate wings. I always start with the one I dislike — that way the model has a fraction of a chance of getting finished. Starting with 3/32in balsa, make a box, putting the formers into place if you can reach them. Of course, some formers must be placed in the fuselage or you may get some flutter in flight, constituting a very crazy flight pattern. After all of this is glued together, it makes it easier to run the nose into something hard. This gives the snubbed nose effect. It is best to be absolutely sure all glued parts are dry before you complete this part of construction or you may have to start all over again. After this is completed, some sanding may be necessary. As this expends a certain amount of energy, I always use my own judgement as to how much is needed. (Often as little as possible; usually, none.)

Now, make sure the wing cutout is made in the right direction. The fatter part goes toward the nose (this is done to make a better fit for the ailerons). According to how much time you want to spend on this model, fillets may or may not be used. They don't have too much to do with how the plane flies. But some modelers prefer staying in the workshop to watching TV before the kids go to bed. Now that you have some idea of how the fuselage goes together, it is time to think about the flappers that hold this thing up in the air. Wings are fun! They have nice curves and forms. We try to copy birds for airfoils which works out very well. They should, since birds had them first..."

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Ugly Twin - completed model photo

Datafile:

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User comments

Here's a couple of pictures of my current build, a George Kostura design, called the Ugly Twin, Oz 9481 [more pics 005, 006]. Other than a few minor changes to the wing planform, the balance is built to plan. Super simple design. Easy building. Power will be a pair of Thunder Tiger .25's. Will forward pictures of completed plane when finished.
RobertS - 08/01/2019
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Scaling

This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.

 

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