Champ

 

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Champ  
by Doc Mathews
from Flying Models
December 1981 
52in span
Tags: Scale IC R/C Cabin Civil
all formers complete :)
got article :)


Submitted to Outerzone: 18/05/2018
Outerzone planID: oz10124 | Filesize: 992KB | Format: • PDFbitmap | Credit*: Circlip, RFJ

   

About this Plan

Champ. Radio control scale model. Wingspan 52in, wing area 390 sq in, for .09 - .15 engines.

Quote: "A Silhoutte Scale version of an all time favorite. Aeronca Champ, by Doc Mathews.

When the long latent urge to build a 'Champ' struck recently I checked over my extensive bibliography and some cataloges to determine what was available. Much to my considerable surprise, the preponderance of published Champs have been 1/2A free flight designs. Certainly several slab sided window-less Champs have been published and kitted, but I'll be darned if I could locate anything like I wanted.

While no obvious explanation for the oversight is apparent, it is certainly regrettable. Perhaps no other American light plane possesses more visual charm than Aeronca's Champ. If one were to draw a caricature of this pot bellied, stub-nosed charmer, it would no doubt resemble some talking airplane in a Walt Disney cartoon. This charm is the underlying motivation in developing the design for publication.

Athough the Champ, as presented in this article, is of scale dimensions, some delib-erate liberty has been taken to simplify con-struction. At first glance, this Champ is identifiable either on the ground or in flight, yet it would certainly not satisfy the scale perfectionist with his 3-views and ruler.

Design and development was directed toward producing a light, well stressed, stable flying model that was easy to construct and maintain. It's silhouette is recognizable as a Champ, yet it is much less complex than a stand-off or museum scale. Therefore, we refer to these oversized 10c rubber models as 'silhouette scale'.

Originally powered with an inverted O.S. Max 15, the model was a very lively per-former. After photographing and flying the Champ for a while in the original form, we opted to abandon the inverted engine with its associated annoyances. An upright 16 year old Enya .09 was retrofitted, converting the model into an absolutely delightful school-yard sized sport 'putt-about'.

Potential builders who desire a inverted (concealed) engine are certainly encouraged to take that route. If, on the other hand, utility and ease of maintenance are more important than impression points, stick the engine out in the breeze!

Flying characteristics are outstanding! With the .09 the model takes off the deck after a tail up roll of about 15 feet (dependent on wind velocity and grass length). She cruises around a 50-60% throttle for 10 minutes or more on just 2 ounces of fuel. Landings are slow, gentle and not the least bit unlike those of an old timer converted to R/C. Touch and goes are a thing of beauty even in brisk winds, and the Champ is willing to shoot landings for as long as the pilot has the urge. This model can be classified as an excellent trainer with the added bonus of scale appearance.

Construction. All balsa and spruce joints are glued with aliphatic resin such as Sig-Bond or Tite-Bond. All plywood joints use five minute epoxy. Wood sizes and hardware items are all standard stock. No unusual tools are required..."

Champ, Flying Models, December 1981.

Direct submission to Outerzone

Supplementary files

Article pages, thanks to RFJ.

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Notes

* Credit field

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Scaling

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