About this Plan
General Aircraft Skyfarer. Rubber scale model by Earl Stahl.
Quote: "A Minature Flying Skyfarer. A Small Scale Reproduction of the Latest Light Plane - Unusually Stable and suitable for Contest Flying. Skyfarer, by Earl Stahl.
Recognizing that the overwhelming proportion of all flying accidents are caused by errors of the pilot judgment, the General Aircraft 'Skyfarer' was designed to anticipate and make inherently impossible these human mistakes. According to the designer, Otto C. Koppen, professor of Aeronautical Engineering at MIT, the Skyfarer cannot slip, skid or spin nor does it lose control when stalled. It is placarded as characteristically incapable of spinning by the CAA.
The Skyfarer is a high-wing monoplane, seating two passengers side-by-side; it is powered by a four cylinder Lycoming engine of 75 horsepower. Most unusual is the fact there is no rudder - turns being made by the ailerons. The ailerons are operated by a steering wheel which also steers the front wheel of the tricycle landing gear in much the same manner as an automobile. The ship is equipped with flaps which contribute to the control of takeoffs and landings.
In performance the Skyfarer compares favorably with other lightplanes. With a geared Lycoming engine top speed is 100 miles per hour. It climbs at a rate of 550 feet per minute and cruises for 400 miles at about 20 miles to a gallon of fuel. Because of the tricycle landing gear and hydraulic brakes, landings can be made at speeds from 45 to 80 miles per hour. Other specifications are: Wing span 31 feet 5 inches; length 22 feet. The useful load is 460 pounds, gross weight is 1350 pounds.
Because of its excellent proportions and interesting construction, this plane is ideally suited for a flying scale replica. The model was developed from data supplied by the manufacturer and is exactly to scale except for enlarged propeller and added dihedral. In spite of its snappy appearance, it flies very well. Standard construction methods are used throughout, so little difficulty should be experienced as your Skyfarer takes form.
Fuselage: A simple rectangular frame is the backbone of the fuselage structure; it is shown lightly shaded. Work directly over tracings of the plan and build two side frames, one atop the other to make certain they will be identical. While it is not absolutely necessary, it is best to steam or soak the longerons in hot water so they will dry with a natural curve, as required; this will aid in keeping the structure from springing out of shape. Hard grade wood is used and longerons and uprights are 3/32 sq stock. Invert the completed sides over the top view and cement 3/32 sq pieces to place at the body center; when dry, draw the backs inward and place the remaining cross-pieces. It will be necessary to crack the longerons so that they can be pulled into position at the front.
Cut the formers shown on page three of the plans from 1/16 sheet. Now, if the basic structure is dry, remove it from the workboard and attach the formers to their correct positions. The wing center section is constructed directly atop the fuselage; make this very accurately as the wing's correct placement is determined by its position. Since the stringers are merely fairing strips, they should be medium-soft balsa; they are cemented directly to the underframe except where there are formers, of course.
Before the nose can be completed it is necessary to attach the front landing gear fork. A full scale plan of the fork is given. Bend the halves from .034 music wire and then join them by soldering. Align the fork properly against former LG-1; then using needle and thread, firmly sew it to place. Apply several coats of cement over all the former and adjacent structure.
The rear landing gear strut can be made at this time also; it is bent from .040 music wire. The method of attachment is indicated by the perspective. A 5/16 deep piece of hard 1/16 sheet is cemented to the vertical members at section 5S. The wire strut is then fitted over this member and securely lashed to place by wrapping with thread. Add the triangular 1/16 sheet gussets, shown, and apply several coats of cement. Rubber tubing and balsa fairings are not added until later.
The nose is covered with light grade 1/32 sheet; all the shaded area, as indicated on the plan, is covered. Three or four individual pieces will be required. Cement the sheet to the adjacent frame, using pins and rubber bands to hold it in place until dry. The extreme front of the nose is made removable to permit the rubber motor to be stretched for winding. Roughly cut the nose block to shape, lightly cement to the fuselage and sand the entire front smooth and uniform. Remove the nose block and cement a piece of 3/16 sheet to the back so it will fit to the opening in section No.1. The rather blunt tail piece is carved from a very soft balsa block; it is hollowed, as shown.
Tail Surfaces: Construction of the tail surfaces is simple. First build flat frames for the two rudders - or rather fins - and stabilizer using 1/16 thick stock for the outlines and 1/16 sq. strips for the ribs. To give the stabilizer a streamline cross section, cement soft strips of 1/16 sq. to each side of each rib and then, when dry, cut them streamline. The fins are of flat construction. Trim and sand each structure to complete the tail surfaces construction.
Wing: Only the right wing plan is shown so it will be necessary to prepare an accurate plan of the left wing in order that construction can be done directly atop it. With exception of the two 1/16 thick end ribs, all wing ribs are cut from 1/32 sheet. Taper and sand the tailing edges before pinning them into position over the plan. Pin the ribs to their respective positions, then attach the leading edges and spars..."
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Supplementary file notes
Article, thanks to GTHunter.
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User commentsAnother couple of photos of models from your plans built a while ago: Earl Stahl Skyfarer, OZ 6595, rubber scale [model photo & more pics 003]. Another good flyer and looks nice in the air. It looks a bit tatty because it is getting on a bit and has done a lot of flying. Even I looked better when it was built.
TrevorT - 24/02/2019
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