Grumman Widgeon (oz5797)
About this Plan
Grumman Widgeon. Radio control scale twin seaplane for 2 x .60 engines. Wingspan 80in, area 897 sq in.
Quote: "At last, a Sport Scale model of the beautiful Grumman Widgeon Amphibian.
The following construction notes have been kept brief and are only intended to highlight the major phases of construction and to call attention to some areas requiring special consideration. Good luck and we hope you enjoy building and flying your Widgeon as much as we have ours.
The construction techniques used in building our Widgeon are from the time honored old school of thought, namely, built-up balsa, plywood and spruce. The materials required for each phase of construction are clearly called out on the plans. Additionally, you will find numerous detailed sketches and building notes also located on the plans sheets.
The fuselage sides are built up from 5/16 sq balsa framework, directly over the plans on sheet 3. Note that nearly all joints are reinforced with 1/32 plywood gussets. Note: As the first step in the fuselage construction, the four 5/16 sq balsa longerons that are used to form the upper half of the fuselage must be notched to accept the .030 in thick window material, + .015 clearance, or .045 total. The notch can be easily cut using a table saw. The depth of the .045 notch should be 3/16, and the cut should extend approximately 2 in beyond the round windows. See plan sheet #1, section A-A for details. Remember, the notches will face outward, towards the 1/32 plywood skin, and be sure to make a left and right side.
Using 1/4 -3/8 plywood, cut out the fuselage construction templates and secure them upside down on a centerline drawn on your building board. Refer to the plans for the proper location of each station, A-F. Join the fuselage sides using the cross braces, then adding the keel and keel supports. Note: Don't forget to add the tapered 5/16" balsa filler pieces to the bottom of the fuselage sides to allow for the bottom angle. With F-1 installed and the fuselage sides joined together, the sides can be contoured to match the keel/hull bottom braces.
With the hull bottom shaped, the assembly can be removed from the building board and the templates removed. The top fuselage frame can now be assembled and added to the main structure. Again, refer to the plans and building notes on sheets 1 and 3..."
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Supplementary file notes
Article pages, text and pics, thanks to JPM.
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