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Arizona SOMMER MONOPLANE Assembly Manual

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Model Aircrafters
Sommer Monoplane
Assembly Manual
1/4 Scale

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Summary of Contents for Arizona SOMMER MONOPLANE

  • Page 1 Model Aircrafters Sommer Monoplane Assembly Manual 1/4 Scale...
  • Page 3 Smithsonian and Musee de l Air, some pictures and written materials are available. The ¼ scale Sommer monoplane has been flight tested for over a five-year period. It has competed very well in the U.S. Scale Masters qualifiers winning a First Place at one and qualifying at others. It has also won first place in static competitions.
  • Page 4 Please feel free to email me at anytime if you have questions during construction. And certainly let me know any questions or concerns you may have before your first test flight. I sure would like to see a photo of your Sommer monoplane when it is finished! Good luck, Designer: J.R.
  • Page 5 Rudder photo 2 A small 90 degree piece of wire is added after mounting the rudder hooking together the pivot spar and the bottom rib. This keeps the rudder from bending side to side after installation on the fuselage. When mounting the rudder after final completion, do not omit this step! A nylon bushing is added between the pivot post on the fuselage and the top of the rudder pivot spar.

  • Page 6: Wing Panels

    Wing Panels The first step in wing construction is to reinforce and cap all the ribs. First, glue on the vertical reinforcing pieces to each rib using the 3/32 x 1/4 inch balsa pieces. The position is not critical, just space them about as shown on the plans.
  • Page 7 Wing photo 3 tip material to the notch in the leading edge. A wrap of nylon thread soaked in ca reinforces the joint. Notch the top of the spars and mate the tip to them. (the bottom of the spar is tapered afterwards so it will not interfere with the covering) Wing photo 5 Wing photo 4...
  • Page 8 Using the rigging reference points on the plans, cut and glue the balsa material to the top and bottom of the spars at all locations between the appropriate ribs. Use the 3/8th x 5/8 in for the front spar top and bottom, and the ¼ in x 3/8in pieces for the rear spar top and bottom.

  • Page 9: Landing Gear

    Some of the best sources I surveyed about the Sommer monoplane agreed that rib stitching was probably used on all ribs except the first four inboard ribs.
  • Page 10 After a careful wrap of fine brass or copper wire, and a check that all parts are aligned, solder the structure together with silver solder. The mid cross brace is added last along with the flying wire rigging tabs. Note: The manner in which you solder the basic structure together can affect the position of this upper cross brace.
  • Page 11 Landing gear photo 5 After all tabs are added, you may proceed to glue on the balsa fairing pieces and shape them to a common elliptical shape. This is not a fun job as you must do a little creative glueing here, but I know of no other way! In both prototypes I covered the fairing with Coverite”...

  • Page 12: Fuselage Construction

    Fuselage Construction Begin by splicing the ¼ square basswood longerons to make the necessary length. Two splices on the bottom, and one splice on the top longerons are necessary. Note the angle of the joint in the longerons at the bottom of the doubler and the splice on the lower longerons at the stabilizer area.
  • Page 13 A servo arm about the same width as the warping bellcrank should be used. Once those openings have been cut, and with the fuselage upside down, proceed to glue in place the F2 sub firewall, and the F3 bulkhead making sure all is “squared up”...
  • Page 14 Finally, cut and glue into place each of the criss-cross 1/16th inch dowel braces into each of the bays from the cockpit sides to the tailpost. Dowels are not installed in the top and bottom of the tailpost bay. Install the aluminum rudder pivot post to end of the fuselage.
  • Page 15 Pulley photo 1 After soldering, the 2 aluminum sheeves, brass bushing and 2x56 s.s. bolt with lock nut make up the complete pulley system. When removing the upper assembly there may some springing action of the feet in the holes. Some bending of those feet may be necessary when permanently reinstalling the pylon.
  • Page 16 Fuselage photo 8 The top pylon is epoxied in after final finishing. Glue the F15 cockpit bottom into place. Notice that the forward edge of this piece extends forward of F3 slightly and is adjusted to line up with the forward beveled edge of the hardwood landing gear block.
  • Page 17 The bellcrank will be installed at the time of rigging. It can be retained with a wheel collar or a washer soldered in place Temporarily install the stabilizer. Shape the rear stab block material to conform to the fuselage outline and trim the front block material for best fit.
  • Page 18 Tailskid photo 1 Solder the bottom of the “V” together using a wire wrap and set the angle of the legs so they will fit to the fuselage as show on the plans. After the basic V is done, and the length is cut on each leg (leaving enough for a “foot”), sleeve with a length of the 3/32 aluminum tubing.
  • Page 19 Glue in F11 rib. It adds a slight radius to cockpit decking. This is an optional piece. On a couple of the Sommers I used it, on the third I left it off. You may add the F7 cockpit deck material now or after covering. At the skid area, add a ¼...
  • Page 20 Sommer 3 photo Final Assembly and Rigging It is a simple matter to attach the rudder. When sliding the rudder into place be sure it sits about 1/8th inch or so above the fuselage top. Glue a bushing of sorts on the spar of the rudder of the same size as the rudder pivot post after you have test fitted for the proper height.
  • Page 21 Rigging photo 5 The cable and crimps supplied in this kit are the same as used in fishing applications. There are other more “aircraft” oriented types, however this kind has been used quite successfully in the other Sommer aeroplanes. . Use the large size turnbuckles in rigging the wings. First attach the main landing wire from the upper pylon to the outer mounting point on the wing.

  • Page 22: Control Throws

    Rigging 3 photo The last photo shows a typical rigging arrangement of turnbuckle and mounting tab. Rigging 4 photo A 2-56 socket driver on the bottom and ball driver on the top make rigging and disassembly very quick and easy. The rigging wires may then be wrapped around the upper pylon and the pilot figure for storage and transportation.
  • Page 23 Finished Sommer 2 photo Flying photo...
  • Page 24 Sommer ARIZONA MODEL AIRCRAFTERS A registered tradename of Digital Design LLC. 13814 N. 56th Place, Scottsdale Arizona 85254. 3 VIEW DIAGRAM COMPONENTS OF THIS DESIGN GRAPHIC AND REPRESENTATION HAVE BEEN DIGITALLY REDRAWN. SHEET 1 of 1 Model Aircrafters www.arizonamodels.com SCALE OUTLINE DRAWINGS Copywrite 2005 by Arizona Model Aircrafters ARE SHOWN AT 2”:1’...
  • Page 26 7 Cylinder Rotary Gnome All Scales...
  • Page 27 Always inspect the model before and after each flight. Gnome Aircraft Engine ARIZONA MODEL AIRCRAFTERS A registered tradename of Digital Design LLC 13814 N. 56th Place, Scottsdale Arizona 85254 ALL SCALES CONSTRUCTION DIAGRAM SHEET 1 of 3 Model Aircrafters www.arizonamodels.com...
  • Page 28 Gnome Aircraft Engine ARIZONA MODEL AIRCRAFTERS A registered tradename of Digital Design LLC 13814 N. 56th Place, Scottsdale Arizona 85254 ALL SCALES CONSTRUCTION DIAGRAM SHEET 2 of 3 9 Cylinder Gnome Shown Model Aircrafters www.arizonamodels.com...
  • Page 29 Gnome Aircraft Engine ARIZONA MODEL AIRCRAFTERS A registered tradename of Digital Design LLC 13814 N. 56th Place, Scottsdale Arizona 85254 ALL SCALES CONSTRUCTION DIAGRAM SHEET 3 of 3 Model Aircrafters www.arizonamodels.com...
  • Page 30 Vintage Wheel Assembly Directions...
  • Page 31 A registered tradename of Prototype Production and Engineering inc. 14715 North 78th Way Unit 600, Scottsdale Arizona 85260. Assembly Suppliment are ready to lace the wheel. SHEET 1 of 4 Copywrite 1998 by Arizona Model Aircrafters a registered tradename of Prototype Production and Engineering inc.
  • Page 32 ARIZONA MODEL AIRCRAFTERS A registered tradename of Prototype Production and Engineering inc. 14715 North 78th Way Unit 600, Scottsdale Arizona 85260. Assembly Suppliment SHEET 2 of 4 Copywrite 1998 by Arizona Model Aircrafters a registered tradename of Prototype Production and Engineering inc.
  • Page 33 ARIZONA MODEL AIRCRAFTERS A registered tradename of Prototype Production and Engineering inc. 14715 North 78th Way Unit 600, Scottsdale Arizona 85260. Assembly Suppliment SHEET 4 of 4 Copywrite 1998 by Arizona Model Aircrafters a registered tradename of Prototype Production and Engineering inc.
  • Page 34 Sommer Monoplane 1 /4 Scale Parts list Wing material: Description 4- 1/8 x 48 hardwood dowel Sub spars 4- 1/4 x 48 hardwood dowel L.E. and rear spars 2- 3/8 x 48 hardwood dowel Main spars 2- 3/32 x 1/2 x 48...
  • Page 36 Model Aircrafters www.arizonamodels.com Cw2006 by Arizona Model Aircrafters a registered tradename of Digital Design LLC 13814 N. 56th Place Scottsdale, AZ 85254...