Ringmaster oz2765

 

Ringmaster - plan thumbnail image

Ringmaster - completed model photo

This plan was found online 15/04/2012 at: http://www.rcgroups.com/forums/showpost.php?p=21326086&postcount=9393
Outerzone planID: oz2765 | Filesize: 424KB | Format: • PDFbitmap | Credit*: Modelholic, Uncle Willie

   

About this Plan

Ringmaster. Control line stunt model. For .19 to .35 engines, Veco .29 shown. Model Airplane News, October 1951. Harry Williamson's Ringmaster.

Quote: "The Ringmaster is a tried and proven stunt ship that originally took to the air in the summer of 1947. In the four years that have passed since that day, we have built many of these ships and with some changes, structurally and aerodynamically, have produced the version you see here.

This design has been scaled up for the big 'Sixties' and down to the tiny 'A' jobs. Regardless of the size, it has proven its ability. Speed, strength, ap-pearance and full-pattern ability are its features. Although designed for the K & B 29, the version shown on the drawings has also been flown with the McCoy 36 and will turn in a very creditable performance when flown with 0 & R 23's.

Construction is conventional and quite simple, even for the less experi-enced. The wing is of the single I-beam spar type, with sheet covered leading and trailing edges. Fuselage construction is a glorified box with flat sides and bottom and a rounded, planked top. Engine mounts that extend two-thirds of the wing chord, offer that much-needed strength in a crackup.

Fuselage Sides: Select two pieces of 1/8 hard sheet balsa and cut out the fuselage sides. Two nose reinforcement pieces are made of 1/16 plywood and cemented to each side. Hardwood mounts, 3/8 x 1/2 in, are cemented in place and additionally strengthened with #2 flat-head wood screws, through the mounts and into the plywood. Cut out each side for the wing and lay both halves aside.

Wing: This part of the airframe, since it takes all the flight loads in those violent manuevers, requires a great deal of care to obtain maximum strength and efficiency. Cut out 20 ribs from 1/16 hard sheet balsa and sand to shape. Two pieces of 1/8 x 1/2 hard balsa strip form the upper and lower halves of the I-beam spar. Pin one piece of 1/8 x 1/2 to your workbench and cement the ribs in place. Before allowing the cement to harden, cement the lower half of the trailing edge to the ribs and correctly align the assem-bly. After sufficient drying time has elapsed, the top half of the spar and the leading edge may be added..."

Update 07/01/2019: Added article, thanks to RFJ.

Supplementary files

Article.

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oz2765 datafile

Ringmaster  
by Harry Williamson
from Model Airplane News
October 1951 
40in span
Tags: IC C/L LowWing
all formers complete :)
got article :)

 

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User comments

5 channel because I programmed in the flaperons ..... [more pics 003]
Charlie - 02/06/2016
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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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