Sporty (oz338)

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Sporty (oz338) by JS Humphreys 1950 - plan thumbnail

About this Plan

Sporty. Free flight biplane sport model for .75 to 1.8 cc power.

Quote: "THIS neat little biplane was sent by the designer to the Editorial offices for us to test and photograph. As a result we enjoyed a very pleasant hour's flying with a model that is delightful to handle, surprisingly stable in flight and very pretty indeed to watch.

Biplanes have flight characteristics that are different to the ordinary run of models. We can never really explain what it is, we only know that we never tire of watching them in the air and this one is no exception. And now let us make way for the designer's own comments:

Sporty, as the name suggests, designed for sport flying, was thought out originally, for ease of construction, straight-forward trimming, good looks and use with small engines. It has proved to be a reliable and consistent flyer in all weathers, powered with a variety of engines from .75 cc to 1.8 cc.

All radially mounted engines have used the same bulkhead, and for beam mountings, Juneero metal strip formed the bearers. Differences of engine weights have so little effect on the trim, that slight alteration of tailplane incidence is all that is necessary. If ignition equipment is used, locate it directly above the lower wing.

Construction is quite straightforward and should present the newcomer to power models with no difficulties. The fuselage is of the orthodox rectangular type with formers and stringers added, to which the pylon is attached. The latter is constructed first, and should be weighted while setting, to avoid distortion. The front formers 'C' are next cut from 1 mm. ply and 1/8 sheet balsa, laminated as shown on the plan. Cut slots in F2 and F3 for location of the pylon and cement them together..."

Update 21/07/2016: Replaced this plan with a clearer copy (patterned background removed) thanks to TonyP.

Supplementary file notes

Previous scan version. Also, article pages.

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Sporty (oz338) by JS Humphreys 1950 - model pic

Datafile:

Sporty (oz338) by JS Humphreys 1950 - pic 001.jpg
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Sporty (oz338) by JS Humphreys 1950 - pic 002.jpg
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Notes

* Credit field

The Credit field in the Outerzone database is designed to recognise and credit the hard work done in scanning and digitally cleaning these vintage and old timer model aircraft plans to get them into a usable format. Currently, it is also used to credit people simply for uploading the plan to a forum on the internet. Which is not quite the same thing. This will change soon. Probably.

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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