Iolanthe II (oz12354)

 

Iolanthe II (oz12354) by NM Braun from Aeromodeller 1948 - plan thumbnail

About this Plan

Iolanthe II. A 72 inch high performance sailplane.

Quote: "Iolanthe I first flew in the Spring of 1945. I wanted to I design and build a model having a reliable and consistent all-weather performance. Furthermore it should possess pleasing lines coupled with straightforward and strong construction. In those days a six foot glider represented a major venture in my aeromodelling career, so I summed up all practical knowledge, and straining my matriculation mathematics to its limit drew up plans for Iolanthe I. Some two weeks later the model was completed and launched upon its maiden voyage. To my delight it flew straight off the drawing board, but little trimming being required.

This model had twin tow hooks and auto rudder control. The fuselage was sheet-covered on balsa formers but without a central boom.

Iolanthe II had a larger span with a corresponding higher aspect ratio. Twin tow hooks and auto rudder control were cut out, since the rudder could be set for a fantastically tight circle without any sign of towline instability.

The model flew away on its first day out from a hillside hand-launch; it was timed for seven minutes before the small red speck was finally lost to view amongst the woodland glory of the Mendips. Flights of seventy seconds were usual off a hundred foot line.

Building the model is simplicity itself, and if the following sequence of construction is carried out even a novice will be ensured of a correctly aligned model. In a job such as this, true assembly is more important than a first rate finish. Commence construction with the wings and wing boxes. When this unit is completed the formers are made and glued to the boom. It is advisable to use Durofix for all hardwood to balsa, and hardwood to hardwood joints. '

The fin is built and aligned with the fuselage which is now completed. The balsa. stringers are added` after the front half has been planked. Finally the tailplane is made, and used as a guide when the tail platform is glued to the fin. The upper fin completes the construction.

The drawings provide all other details. The model is double covered with the exception of the tail unit which is single covered. Two coats of glider dupe, with one coat on the tail unit, and on the original the fuselage and leading edges were painted red, using Nu-Brik.

The model will be found to possess pleasing glide characteris-tics, its descent being majestically slow and stable and if accurately built will reward its constructor with good and consistent flying."

Direct submission to Outerzone.

Supplementary file notes

Article.
Original scan (patterned background).

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Iolanthe II (oz12354) by NM Braun from Aeromodeller 1948 - model pic

Datafile:
  • (oz12354)
    Iolanthe II
    by NM Braun
    from Aeromodeller
    July 1948 
    72in span
    Glider F/F
    all formers complete :)
    got article :)
  • Submitted: 16/07/2020
    Filesize: 601KB
    Format: • PDFbitmap
    Credit*: RogerClark

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  • Supplement Filesize: 2432KB Filename: Iolanthe_II_oz12354_original.pdf
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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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