Tipsy Junior (oz926)

 

Tipsy Junior - plan thumbnail image

About this Plan

Tipsy Junior. Control line scale ultralight aircraft.

Quote: "A 28 inch span control line model designed for motors from 1cc to 2 cc that combines scale looks with full maneuverability. Tipsy Junior Stunt model, by HG Hundleby.

One glance at the full-sized Tipsy Junior and I realised that here was an almost perfect scale stunt model. In fact, one could almost imagine the prototype machine having been designed for that specified purpose. EJ Riding, who has seen EO Tips' delightful little aircraft in flight, tells me that its manoeuvrability really is exceptional and the model I am happy to say, possesses very similar qualities. It is sensitive to control, and I warn beginners here and now that it is not a model on which to learn to fly. But for experts and those fliers similar to myself, who can manage loops and a little precarious inverted flying, here, as our American friends would say, is a 'dream ship'.

Finished in the correct colour scheme of silver, primrose yellow and red, it is indeed a pleasure to behold and the prototype with that astounding Elfin diesel is undoubtedly a pleasure to fiy. The prototype was designed around this particular engine, the cowling fitting it like a glove, with the intake and compression lever just protruding.

When first test flown the model was over-sensitive and provided many anxious moments, but once this was remedied by adjustment to the control plate no further trouble was experienced. The original has, however, suffered several prangs, including a vertical dive on to concrete. Nevertheless, it is still flying at the time of writing. I mention this because it is my considered opinion that all control line models should be so constructed as to withstand heavy smashes, which they all suffer at some time in their career, usually through pilot trouble. The crashes sustained by the Tipsy had the advantage of proving the durability of the particular construction used. The two-ply formers that link up with the wing spars are of course the most important items. They are the 'keys' which lock the whole structure into one, and I cannot over-emphasise the importance of making them accurately and from first class plywood.

Construction generally is quite straightforward, The two sheet balsa sides being inverted over the plan for the addition of the cross members, etc. When this basic frame is assembled add most carefully the two main formers, remembering to attach the undercarriage to F.5 before doing so. Build the wing flat in the usual way..."

Update 24/10/2018: Replaced this plan with a clearer copy thanks to DBHL, theshadow.

Scan from DBHL, cleanup by theshadow.

ref DBHL-30002.

Direct submission to Outerzone.

Supplementary file notes

Article.
Previous scan version.

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Tipsy Junior - completed model photo

Datafile:

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User comments

This is a Frog 150 powered Hundleby Tipsy Junior I built about 55 years ago [model photo]. Nice flyer and moderately aerobatic too.
Sundancer - 28/03/2016
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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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