Delta Lady. Radio control aerobatic slope soarer.
Quote: "Design parameters of a not-too-orthodox but highly aerobatic soarer has been met with the Delta configuration for our unusual but neat sailplane that can be fun or businesslike for contesting! The Delta Lady, by Mike Trew.
After taking the natural progression from a trainer type soarer up to a highly aerobatic soarer I looked around for something new to build and fly. I desired a model that was different and original but not too unorthodox such as a canard or 'tail first' design. I struck on the delta type planform as it had the obvious advantage of low wing loading, sleek drag-free lines, and plenty of room to stow away the radio equipment.
I tried to find a suitable design but there was very little available and those that were had only been developments from free flight models. Therefore, I decided to design my own. I gave considerable thought to designing a layout that was as efficient as possible yet not too complicated to make the construction lengthy and tiresome. Right from the outset I discarded the use of elevons as they are a compromise giving too much pitch effect but not enough roll, and if mechanical linkage is used there is invariably too much linkage slop.
The trailing edge was raked forward to give a straight hinge line, giving a large area of elevator which only has to move through a small amount to give the required degree of effect. This had the effect of considerably reducing surface drag. The ailerons are placed outboard where their effect is greatest. The wing section is fully symmetrical SI .03006 and the reflex is incorporated by deflecting the elevator upwards. It may be a temptation to raise the aileron also to obtain a constant line through the trailing edge but this is inadvisable as the inverted flight characteristics will suffer.
A low wing design was chosen to make it look more scalish and the fuselage nacelle is bolted on to the top of the wing. The large fin was used to obtain good directional stability and a generous rudder surface is incorporated to give a good stall turn effect..."
Delta Lady, MAN, February 1979.
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