About this Plan
Schooler. Rubber contest model.
Quote: "A 30 inch wingspan lightweight rubber model for contest beginners. Schooler, by RM Thorogood.
SCHOOLER was designed as a competition model with the emphasis on simplicity, and intended to be suitable for modellers with experience of elementary sport models, such as can be gained from many popular kits. It was thought that a model of small size would be most suitable but with a minimum still air performance of 3-1/2 min. To obtain this performance a wing span of 30 in was the minimum size that could be used, so the design was based on this dimension.
For simplicity and stability a parasol wing mounting was used - this avoided the use of a pylon mounting with its inherent complications, and dictated the use of a slab-sided fuselage. The folding propeller and dethermaliser are an essential part of the competition light-weight and these were naturally incorporated in the design. The resulting model has a performance in calm air of 3-1/2 to 4 min, with a rapid climb and floating glide, and the design has been built and flown by juniors and seniors with highly satisfactory results.
Fuselage: Commence construction by building the fuselage sides. The first side should be built over the plan omitting the sheeting and gussets. Care must be taken to set the 1/16 in sq spacers with their lower faces flush with the bottom of the longerons. The second side must be built directly over the first but with the top faces of the 1/16 sq spacers level with the tops of the longerons.
All the cross spacers should then be cut to size from the top view of the fuselage, and the three central pairs of 3/32 sq spacers cemented to the inside face of one of the fuselage sides, taking care with their alignment. The second side can now be cemented to the spacers, the assembly being held together with elastic bands; it is important to keep the fuselage square at this stage. When dry the remaining spacers can be added ; the nose and tail being drawn together first, then the intervening spacers added outwards from the centre.
The nose sheeting and gussets can now be added, also the plywood reinforcements. The parasol supports should be bent from 20 S.W.G. wire and also the dethermaliser hook; these must be bound to the fuselage with thread and given a liberal coating of
cement. Finally, the motor peg must be carved from hardwood, be careful to see that the peg is sufficiently strong for its job.
Wings: Lay down the leading and trailing edges on the plan, packing up the trailing edge to allow for the under-camber, also remember to pack the lower main spar to the correct height when placing it in position. Cement all the ribs in place except the centre one, then when dry remove the wing from the plan and cement the upper main spar in position, finally building up the wing tips as shown. To set the dihedral angle, pin one wing panel flat on the building-board and pack the other panel up until its tip is 2-1/2 in above the board. Trim the spars to fit at the centre and cement them together, then cement the dihedral braces in position, followed by the centre rib - trimming this as required..."
Schooler, Model Aircraft, January 1959.
Direct submission to Outerzone.
Supplementary file notes
Article pages, thanks to RFJ.
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