Schweyer Rhonsperber (oz7434)
About this Plan
Schweyer Rhonsperber. Stand off scale glider model for radio control.
Quote: "Mike Hollison has taken an early vintage German sailplane which was a contest winner and record breaker in the late thirties, and created a Stand-Off Scale model which flies great. Schweyer Rhonsperber by Mike Hollison.
The Rhonsperber was a gull winged German sailplane, first flown in 1935, and developed by Hans Jacob, the designer of such famous gliders as the Rhonadler and Rhonsbussard thermal ships of the early thirties. For three years, the Rhonsperber was the leading German glider in contests and record breaking flights, with two world record long distance flights to its credit, the first sailplane flight over the Alps and, in 1937, a new world height record of 18,890 ft.
The model Rhonsperber was conceived as a simple, easy to build, easy to fly scale ship capable of being launched by a hi-start, so that the modeler could enjoy scale soaring on a regular Sunday fun-fly basis. The Rhonsperber has also been flown very successfully on the slope and is equally at home in slope lift as it is in a thermal. Construction is of the traditional balsa and ply variety, controls are rudder and elevator only, and the whole project should prove no harder to build than the average standard class sailplane.
Construction. Start with the wings, building each in two sections as one would a polyhedral ship, and beginning with the inboard panel.
1. Cut the leading edge and bottom spruce spar to length and lay them out over the plan. Then cut the trailing edge to size, slot for wing ribs and position in place. Cut out all the wing ribs (two of W5) and glue ribs W4 in place. Glue the top spruce spar in position, then add W1, using the template to establish the correct dihedral angle.
2. Fill in the gap between the W3 rib location and W4 with 1/4 in balsa shear webbing between the top and bottom spars. Next, cut the forward wing brace W16 from 1/16 ply and epoxy between W1 and W4. Cut the 1/4 o.d. brass tubing to length and epoxy in place between W1 and W3 with microballoons as indicated on the plan, using a piece of scrap balsa to raise the end of the tubing to the correct angle. Epoxy the rear wing brace W16 in place, cut ribs W2 and W3 in half and glue them in position.
3. Cut two polyhedral braces W17 from 1/16 ply and epoxy to the wing, remembering to sandwich a piece of 1/4 shear balsa webbing between them. Cut rib W5 in half, and glue in place. Next, add the 1/16 balsa webs between ribs W5 and W4, the 1/4 x 1/8 spruce sub spar, and a length of 3/32 i.d. brass tubing between W1 and W2 for the rear wing alignment pin. Strengthen this with strips of scrap balsa as indicated on the plan.
4. Sheet top and bottom of the wing panel with 1/16 balsa as shown, and cut the root rib from 1/16 ply, drill for wing rods, and epoxy to Wl. Repeat steps 1 to 4 for the other inboard section.
5. Now start work on the outer wing panel by cutting leading edge, bottom spruce spar and trailing edge to length, slot the T.E. for the wing ribs and lay out over the plan. Glue ribs W6 to W15 in place, then add the top spruce spar..."
Hi Mary/Steve - Here is Mike Hollison's Schweyer Rhonsperber from RCM magazine issue 09-89.
Direct submission to Outerzone.
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