Ruhig Tigre (oz12174)
About this Plan
Ruhig Tigre. Radio control sport trainer model.
Quote: "Your big 60 span FREE Superplan sportster by Colin Dickinson.
Ruhig was designed after listening to part of a conversation between a couple of club members; it was heard: W‘hy do most trainers have to look like ruddy boxes with wings, etc? This is a sentiment I fervently agree with so, after a few outline sketches, I drew up the plans and built my own solution to the problem and, a couple of weeks later it flew!
The prototype went very well on an old Super-Tigre 45; this gave it quite a lively performance, but where the model really comes into its own is when the throttle is closed. Its slow speed handling is something to see. Then just crack the thing open and go vertical - it's great fun! So on with the building.
Fuselage: First cut yourself a kit of parts front balsa and liteply including two fuselage sides front medium 3/16 square, 3/16 front panels, complete with 1/32 ply inner doublers and 3/16 sheet gussets. Next join the side assemblies: start at the front over the upper side view, allowing the longerons to extend 17 in rearward, past F5. Complete the open frame panels by aligning the assembly over the rear side view from F1 to F4. Use epoxy for this and, when dry, clean away any excess glue, etc, cheek that all is square then add the top formers and stringers. Fit the cockpit floor and finish off with two laminations of 1/16 sheet to form the cockpit coaming and decking back to F4.
Now mark out and fit the undercart mounting; this is formed from two laminations of 1/8 lite-ply, the upper one fitting inside the fuselage and the other fits over the edges of the fuselage and F2. Epoxy this in place then mark, drill and bolt the commercial undercarriage with four 4 mm bolts and captive nuts. Do all your engine fitting and plumbing at this stage, then you can decide what type of cowl you fancy. made up front scrap ends of balsa and ply. The next 'Ruhig' I build will have a dummy radial fitted, so why not try this.
Wings and things: These are as straightforward as you could wish for. Make up your kit of parts, cover the plan with polythene then cut some small 1/16 sheet packing pieces to go under the main 3/8 x 1/4 spar at the starboard wing. Pin down the spar over the plan and place all the ribs in position. Mark all rib positions on the 1/16 trailing edge sheet, slide under the ribs then glue the lot at one go. Next, glue in place the top spar and false leading edge.
Repeat for the port wing panel, the symmetrical section allows the 'Superplan' starboard wing drawing to be used for the port wing. Remember to position the appropriate ribs with the slots facing up on the starboard and down on port. (Otherwise the braces B1 and B2 will not fit!) When this is complete you then position botlt panels over the plan to build the centre section, inserting B1 and B2 from the top. After this is finished complete the job by sheeting all the areas marked on the drawing. No we have not forgotten the wing tips - these are made separately with laminated strip outlines, and are best tackled while the tailplane is being built.
Tailplane, fin and wing tips: Pick yourself some very light 1/ 16 sheet and make up some edge-joined panels, large enough to enable all the core pieces to be cut out. These are made to the inside dimensions (leading edge to trailing edge) on the drawing. The only exception is for the rudder, which goes fully to the outer trailing edge. Mark the rib positions on each side of the core panels. Do this by working from the hinge spar sides: ie use a 1/2 x 1/8 upper main spar followed by the 1/8 sq half ribs. When these are dry sand them flush and square with the edge of the core panels. Now turn the assembly over and repeat the process on the other side.
Finally, laminate the outline and apply to the edges. then round it off per the sections shown at 'A-A'. You can now return to the wing tips. Glue the upper half ribs (W3) in position on the tip cores. Put 1/8 in packing under the core, flat on the board, and add the outline laminations and angled tip spars. Turn the assembly over and fit the lower W3s and spars. Trim and glue to the otherwise finished wings - they should look like section 'B-B'. Finally sheet each tip from main spar to leading edge and blend it into the wing sheet. There are no cap strips on W3.
Radio: Fit the servo in the wing centre section and mark the two ribs each side with the centre of the hole you decided to use in the output arm. Then, with a piece of sharpened tubing, cut holes through each rib to accommodate a length of Sullivan hard snake. Cyano this in position, make up two small ply plates to fit between the ribs and mount the 90 degrees bellcranks. Ensure that there's a nice free movement with no binding or tight spots anywhere - sheet under the pushrod exit bay after a trial hookup of pushrod and horn. Fit the other three servos abreast in the fuselage just above the wing bolt position; the receiver is stuck to the cockpit floor with servo tape and the battery goes under the tank.
Flying: Set up all the flying surfaces to these instructions; wing 1/2°+, tailplane 0°, engine 1-1/2 to 2° right thrust, ailerons 1/2 in each way. Hell, that sounds like a bet on the horses! Check that all movements are the right way. Pop her out on the strip and gently open the throttle - giving a touch of rudder to keep her running true. Ease back on the stick and away you go - just do a few circuits to get the feel of things, then see how slow she will fly. Both of mine can be made to fly in still air down to about 10 mph and in a bit of breeze you can make them hover!
I hope you enjoy flying the Ruhrig as much as fellow club members have had flying mine. Happy landings folks!"
Direct submission to Outerzone.
Quote: "Ruhig Tigre: Colin Dickinson's 60 in out-of-the-rut trainer, the second (super) plan from the November '90 Radio Modeller. Though not mentioned in the article, 'Ruhig' is German for calm, quiet or peaceful. Not sure why it's Tigre rather than Tiger though."
Note this plan was originally printed in colour (blue and red lines). Here the main planfile is monochrome. See supplement file for colour version - a compressed jpg file at at 240 dpi.
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