Tipsy Junior (oz3949)
About this Plan
Tipsy Junior. Control line scale stunt model.
Quote: "Scale? Roger! A good stunter? You betcha! Takes McCoy, OK, Bantam 19, even .29 motors. Tipsy Junior, by Aubrey Kochman.
HOW many times at a control-line stunt contest have you heard the expression - It sure does everything in the book, but it doesn't look like an airplane to me. Or - It's a beautiful model but I'd hate to see it crack up, it sure must have taken plenty of time to build!
With these thoughts in mind, I set out to find a model that would be a perfect scale model, or as near to scale as practical, a good stunt ship and a cinch to build. Things didn't look too well until I ran across the Tipsy Junior. It looked like the answer, and after carefully scaling up the plans, I found that this definitely was an ideal stunt model.
The Tipsy was designed by OE Tips who has been associated with the design of successful light aircraft since the middle thirties. The registration letters show that the airplane was licensed in Belgium. It is an ultra-light aircraft, having for a power plant a 60-hp four-cylinder, inline, inverted, air-cooled Walter Mikron, while another version is fitted with a 36-hp JAP horizontally opposed twin-cylinder engine.
The model as presented here was scaled up from the three-views to a size that would take a Bantam or McCoy 19 fully enclosed, except for the glow plug, and have good performance with either engine. A Bantam powers the model shown and construction was planned to keep the weight to a minimum without sacrificing strength. Choose your wood with this thought uppermost and you should have little trouble in keeping the weight to about 15 ounces.
If you like to fly control-line with models that look like the real thing and yet are not too fussy about exact scale, engines like the Ohlsson 23 or 29, McCoy 29 or OK 29 may be used if the nose of the model is widened just enough to take the engine and the cylinder head is allowed to protrude either in an upright or inverted position.
To begin construction you will first have to scale up the drawings. Better still, order a set of full size plans from Air Trails. In either case start by laying out the two sides on sheets of quarter-grained balsa 3/32 x 2 x 21 in. Check both the top and side' views when doing this as you will lose almost 1/2 in in fuselage length if you work only from the side view. With the two sides cut to shape, cement the 3/32 square longerons and uprights directly on to the sides.
Next cut through the longerons and lightly score the sides at the points in the fuselage where, seen from the top view, it bends sharp-ly just forward of the cockpit at former 4 and again at former 3. Apply glue at these breaks and start cementing in the cross braces..."
Quote: "Here are the plans and mag pages for a tipsy Junior controline plane from 1949 I am planning to build one of these for my Bantam 19."
Direct submission to Outerzone.
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ScaleType: This (oz3949) is a scale plan. Where possible we link scale plans to Wikipedia, using a text string called ScaleType.
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User commentsTipsy Junior, built from Air Trails plans, Webra Mach I engine, (1954) [more pics 003, 004].
JesusAbellan - 27/02/2017
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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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