Mini Egal (oz10626)
About this Plan
Mini Egal. A/1 glider model. Uses a Jedelsky style all-sheet wing.
Quote: "Mini-Egal. A High performance A/1 glider with sheet wing structure, by Reino Hyvarinen.
DESIGNING A HIGH performance, yet easy to build A/1 glider is difficult. Using common construction methods, the wing of relatively high aspect ratio having a thin modern section demands careful construction, and many hours of work. 'Standard-Bauweise' developed by Austrians Jedelsky, Czepa, etc is an astonishing way of cutting down building time. Trying this method of construction, and checking the numerous claims of flying performance of these sheet wings led to the design of MINI-EGAL.
Due to the fairly long span of 55-1/8 in (A/R. of 12.8) and the bending strength of this sheet wing, the halves are joined together with one piece of 12 swg piano wire. This gives the already flexible wing extra safety during the tow in gusty and windy conditions. By bending this wire, dihedral angle can be changed, as well as the angles of attack on different wing halves. Yet another advantage of this system is that MINI-EGAL can be packed in a box of only 34 inch length.
One 1/4 x 4 x 36 in and two 1/16 x 3 x 36 in, medium weight, quarter grain balsa sheets are needed. Quarter grain sawn sheets are essential, because most of the strength against flutter at higher than usual speeds (for example after a bad tow release) depends on stiffness. The sheet weights on the original were 2 oz for 1/4 in, and 1/2 oz for each of the 1/16 in sheets.
First step in building the wing is to cut the 4 in broad 1/4 in sheet into two strips of 2 in each. One is used in the centre panels, the other can be used for the wing tips and the sheeting of the fuselage nose. Then the 3/32 by 3/16 in spruce 'buffers' are cemented to one edge of these centre panel 1/4 in sheets. The pieces of 3/16 by 1/4 in spruce spar enclosing the thin walled 3/32 in ID metal tubes for the wire are prepared according to the plan. The tubes and the ply strengthener are cemented on their places using Araldite. When completed, they are accurately set in and cemented to the roots of centre panel 1/4 in sheets.
Meanwhile the tips may be assembled. The elliptical shape is carved first after assembly, so the ready-bent (by moistening and drying) buffer spar can be cemented first after LE has been carved to correct lines..."
Mini Egal, Aeromodeller, August 1962.
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Supplementary file notes
Article pages, thanks to RFJ.
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User commentsI had a 4.5 hour flight with one of these, around 1973! Came off the line inverted at 10am and went out of sight upwards in about 10 minutes. And of course because it was a test flight, no DT set. The day was dead calm. I had my name, address and telephone number on it, though. Later in the day, I had a phone call from someone a few miles away who said it had hit his little brother in the head when landing! At 2:30pm. I got the model back in good shape. Great memories.
Hugh Blackburn - 29/03/2021
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