De Havilland Beaver (oz14047)

About this Plan

De Havilland Beaver. Control line scale model, for .19 - .35 engines.

Originally published in Feb 1952 issue of MAN. This here is a reprint from RCMW-FSP, Dec 2014. As hosted on the mac34.fr site [see datafile]. Note this plan is also stamped as: "Plan from Dave Shipton".

See https://mach34.fr/bibliotheque.php

Note this plan is also stamped as Archive #000014 from the Cooperative Plans Service. See their website at www.co-op-plans.com

Quote: "As the subject for a scale control liner, the De Havilland Beaver leaves very little to be desired. The ruggedness and dependability found in the big plane are equally duplicated in our 3/4 in to 1 ft scale model. With its straight lines and square fuselage, the construction is as simple as any box-car to take the air. And yet a mere glance at the model is sufficient to tell you that the Beaver is no box.

Our model is built around an Ohlsson 23, but you can look forward to good performance with any glow plug engine of .19 to .35 displacement. For larger engines we would recommend increasing the size by 1/4 to make a 1 inch to 1 ft scale resulting in a 48 in wing span model.

The full size aircraft is detailed in the June 1951 issue of MODEL AIRPLANE NEWS so no words are needed on that score. May we suggest that you obtain the full size plans before starting construction? Study the plans carefully and read the construction details thoroughly several times and we are sure that you will have no difficulty.

The fuselage is constructed by cutting two side panels from median grade 3/16 sheet balsa as shown in the side view. You may butt join two sheets to obtain the necessary width. The top and bottom of the fuselage are cut from 1/4 in sheet by 3 in wide. Although the fuselage is over 3 inches in width, allowing for the rounded corners, the 3 in width sheet is sufficient. Cement the fuselage together and allow to dry thoroughly.

The landing gear is now cut and bent to the shape shown. You may use 25ST or 17ST for this member. Bolt the landing gear to the top surface of the fuselage bottom. Use very large (at least 1/2 in dia) washers next to the balsa. If you cannot obtain these large washers you may inlay 3/4 in squares of 1/16 plywood to act as washers.

The engine bearers are spaced to suit your own engine. The spacing shown in the plans is for the Ohlsson 23. Fill-in between the bearers and the fuselage sides with 1/2 in hard balsa. You may install the 3 in Veco bellcrank at this time. Install the gas tank above the engine bearers and just aft of the firewall position. Now carve the cowl block to shape, hollow out if necessary and cement in place. Before filling in the 1/4 in sheet firewall, slip the gas and filler lines in place on the gas tank.

Note that the firewall below the engine bearers is a double layer of 1/4 in sheet. This is to allow the trimming away of the fuselage sides to the shape of the rear of the cowling.

For maximum strength we recommend that you paint the side windows in place rather than cutting them out and installing celluloid. The windshield is celluloid and is installed in place after the wing is set on the fuselage.

The cowling may be purchased if you are lucky enough to find a spun aluminum one of the proper size, or turned from a block of hardwood or built up as shown. To build the cowl, cut three rings from 1/4 in sheet balsa as shown and connect with soft 1/16 sheet balsa and sand to the proper cross section.

It was found necessary to add a 1/16 plywood disc to the third cowl bulkhead for strength due to cutting away for engine space. The cowl may be attached with dress snaps or other hooks.

Cut the tail surfaces to the proper shape as shown in the plans. Use only warp-free 1/16 plywood for these members. You will note the stabilizer is made in one piece. Cement the tape hinges in place and then add the control horn..."

Supplementary file notes

Article.

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