Kiwi Cavu (oz13696)

 

Kiwi Cavu (oz13696) by Alan Wooster 2007 - plan thumbnail

About this Plan

Kiwi Cavu. Radio control sport parasol model. Wingspan 670 in, for .25 2-stroke engines.

Direct submission to Outerzone.

Quote: "I have been a fan for Ken Willard designs for as long as I can remember. Back in the 1980's I came across a small, approx 100mm x 25mm drawing in a monthly newsletter from the Auckland Model Aero Club in New Zealand where I was a member at the time. That small basic drawing took my fancy and I saved it in order to later produce a 3-function r/c sport model based on that design. Much water under the bridge, marriage and relocation etc, and it was getting on for 20 years before I eventually put pencil to paper to produce my plan. That small [1938] drawing is the same one now published here on Outerzone as [page 1 of] the Cavu (oz1081).

There was no indication on the small drawing of the wing other than mention somewhere of it having elliptical plan. That was easy enough to produce. My model is 60 in span (the original was 42 in) and powered with an OS 25 FSR 2-stroke engine. I elected to go with regular balsa and ply construction methods and the model was covered with plastic film. The cowling was produced using lightweight glass-cloth over a simple urethane foam plug. If I was to do this cowling again I would use the easier and neater method involving several layers of nylon stocking over the foam plug.

The completed model weighed in at 3lb 5oz (1502 gms). The OS 25 provided ample power and overall performance was a delight. It could loop, both inside and outside, and roll from straight flight and level and also easily maintain inverted flight. All in all, a surprisingly agile and fun flying sport model, much more than I expected from this rather sedate looking 1938 vintage design. It could easily handle a smaller engine, or conversion to electric power if desired.

This design was published as a free plan with full construction article in the now defunct RCMW magazine in April 2007. By the time RCMW decided to publish the plan, I had already parted with the original prototype model and so required to build another in order to obtain the sundry construction photos. Both models shared the same agile performance."

Update 19/3/2022: Added article, thanks to RFJ.

Supplementary file notes

Article.

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Kiwi Cavu (oz13696) by Alan Wooster 2007 - model pic

Datafile:
  • (oz13696)
    Kiwi Cavu
    by Alan Wooster
    from RC Model World
    April 2007 
    60in span
    IC R/C Parasol
    clean :)
    all formers complete :)
    got article :)
  • Submitted: 09/03/2022
    Filesize: 599KB
    Format: • PDFbitmap
    Credit*: AlanWooster

Kiwi Cavu (oz13696) by Alan Wooster 2007 - pic 003.jpg
003.jpg
Kiwi Cavu (oz13696) by Alan Wooster 2007 - pic 004.jpg
004.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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