Great Profile (oz12562)
About this Plan
Great Profile. Control line profile trainer model.
Quote: "A Rugged control-line trainer for .049 to .09 engines. The Great Profile, by Walter A Musciano.
This solid-balsa control-line model plane is easy to build, economical, and a snap to fly on any engine from an .049 to an .099. The wing is not oversize as on many trainers. Very large wings make models 'float,' thereby threatening slack lines on every upwind pass of the circle. With a moderate wing and long tail-moment arm our model has more speed than the.average trainer but with considerably reduced control sensitivity. The speed increases the centrifugal force thereby reducing the chances of slack lines which spell 'crash' for any beginner.
This model is built from only two sizes of balsa sheet and one size of plywood plus scrap boxwood from a fruit crate. For ease of operation the engine is installed upright instead of on its side. Styling follows that of an 'old timer' or a contemporary open cockpit homebuilt design. Modern jet styling can be incorporated by carving a streamline canopy on the fuselage as the plans illustrate. A two-seater is also shown.
Control-line models are captive planes tied to the flier with thread, fishing line or fine wire and fly in a circle around the operator. The flier holds a short C-shaped handle vertically in his fist; to each leg of the 'C' is attached a length of line that leads to a pivoted lever-type three-armed mechanism on the model called a belicrank. A rod leads from this bellcrank mechanism to the elevators or horizontal hinged tail surfaces. When flying, the lines must be taut. By pulling on one of the lines the bellcrank pushes or pulls the rod thereby forcing the elevator up or down. This causes the model to climb or dive.
As the model circles the flier he must turn at the same speed, facing the model at all times. The flier can than change the model's altitude by merely raising or lowering the outstretched arm that is holding the control handle. Raising the arm pulls the upper line which makes the model climb, and lowering the arm pulls the lower line which makes the model head toward the ground.
Construction: Start with the fuselage or body. For economy this must be pre-assembled by cutting the 1/2 x 2 x 36 inch balsa plank in three pieces and then cementing them together as the plans illustrate. When dry, the fuselage outline is traced onto tissue or other semi-transparent paper. If none is available, tape the plans to a window during daylight and tape a clean piece of paper over them. You should be able to see clearly the outlines of the fuselage. Trace the outline, including the wing and tail cutouts, and the notch for the engine mount.
To transfer this cutting outline to the wood, place the tracing atop the balsa and redraw the lines so that the wood is scribed with the cutting line. With a soft pencil or ball-point pen redraw the scribed lines on the wood. This tracing procedure must be done with accuracy. Use a hand coping saw or an electric jig saw to cut the fuselage to shape. The wing opening is made this way. First, drill a hole through the opening. Now detach and pass the thin saw blade through the hole. Reassemble the saw, and the opening for the wing can be cut.
Trace the plywood doublers for the fuselage as described and cut to shape with coping or jig saw. Smear balsa wood cement on the inside surface of each doubler and press firmly against the fuselage side. Slide the doublers around so the cement is well distributed, then remove the doublers and let the cement dry. Apply a second coat of cement to the doublers and again press firmly against the fuselage..."
Direct submission to Outerzone.
Scans from dfritzke, cleanup by Circlip.
Update 09/11/2020: Added vectorPDF and CAD (dxf and dwg) versions of this plan, thanks to Valeria367.
Quote: "Hi! Steve and Mary. Good afternoon. How are you? I hope all are fine. Years ago, I bought one copy of the Walt Musciano's "Great Profile" plan (oz12562). And, some days ago, I saw you published one copy of it on your web page. How she is one beautiful little model, I worked in the last days to make one CAD version, and now it's ready, and I sent it to you. As usual, I add the PFD vector, and both CAD vectorial formats: DWG and DXF. All the best, from your friend. Valeria367"
Supplementary file notes
VectorPDF plan tracing.
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User commentsThis is without doubt my favourite Walt Musciano photo, ever. From his 'late Vegas' period.
SteveWMD - 11/11/2020
Not even Ziggy Stardust would wear those pants!
Miguel - 11/11/2020
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- Great Profile (oz12562)
- Plan File Filesize: 239KB Filename: Great_Profile_oz12562.pdf
- Supplement Filesize: 3452KB Filename: Great_Profile_oz12562_article.pdf
- Supplement Filesize: 484KB Filename: Great_Profile_oz12562_vector.pdf
- CAD Zip Filesize: 124KB Filename: Great_Profile_oz12562_cad.zip
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