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Related Manuals for Bengtson Company Fokker Dr.I 35"
Summary of Contents for Bengtson Company Fokker Dr.I 35"
- Page 1 Fokker Dr.I 35” Fokker Dr.I 35” R/C Scale Model Instructions CONTACT INFORMATION Designed by M.K. Bengtson Manufactured and Distributed by: Bengtson Company e‐mail: sales@aerodromerc.com Web Site: www.aerodromerc.com Copyright© 2005‐13 M.K. Bengtson All Rights Reserved Rev 04/13 ...
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Page 2: Specifications
Fokker Dr.I 35” Page 1 different from them. However, the concepts illustrated Fokker Dr.I are the same. John Boeck built the Fokker Dr.I prototype. Thank you for purchasing the Fokker Dr.I model for electric flight. COWLING THE MODEL Begin construction of the cowl by gluing C1 and C2 to a strip of 1/32” ply with the grain of the plywood running the short way. After the assembly is secure, trim off the bottom ends of C2 as indicated on the plan. Glue two C3ʹs together with C4 and glue this assembly to the C1/C2 assembly and sand to shape. WINGS Wing Construction Pin down, over the plan, the pre‐cut trailing edge plywood, spars and wing tip, gluing as required. Add the leading edge stock. Sand the leading edge stock to be Finished Model by Jason Haslam rounded and meet the ribs. The middle wing spars are to A semi scale adaptation of the Fokker Dr.I, this model is be left extending as shown on the plans. The spars serve designed to be easy to build and exciting to fly. The most in the alignment of the middle wings to the fuselage. The significant change from scale was that the airfoils were bottom wing halves are built with spars connecting them made flat bottomed. over the plan. Keep them bottom wing in one piece for POWER SET UP strength. The AXI 2217/20 brushless outrunner and 11x6 or 12x6 prop powers the model. SPECIFICATIONS ... -
Page 3: Fuselage Construction
Fokker Dr.I 35” Page 2 The Leading Edge of the Aileron 1/16 Balsa sheeting covers the front/top of the fuselage between formers F1 andF2. The area aft of this is dealt The leading edge of the aileron is rounded over with with later in this manual. sandpaper to make the aileron movable with a minimum gap. The trailing edge of the wing in that section is left MOTOR MOUNT/DUMMY ENGINE flat. Items needed to finish the motor mount: FUSELAGE CONSTRUCTION 3 – 2‐56 x 2” machine screws The fuselage is built as two separate box structures, the Heavy Card Stock paper front balsa sheet and ply area and the rear built up String section, which are then joined over the plan. This system 1/32” music wire, for push rods not only keeps each stage simple, but it also helps to The motor that will power this model ensure a straight fuselage. Find the two 1/16” plywood motor mounts plates. Compare the mounting pattern on the plate to your motor. Adjust the holes if necessary. Laminate the two plates together. Find the 8 3/16” balsa motor core pieces. Laminate them together – one section of 5 pieces and another section with 3 pieces. Check the plans for correct order of pieces. Use the 2‐56 screws to line up the pieces properly. Laminate the 1/16” ply pieces to the 3‐unit section, with the 1/8” notched piece between the 5‐piece section. Mount your motor inside the core unit. A hole for the three motor wires to exit will need to be fashioned. Find the three different sized circular pieces for the engine Fuselage Construction Detail cylinders as well as the 3/32” square balsa center sticks. This builder made a small fixture to glue the pieces square Building of the rear of the Fuselage and proper distance apart. ... -
Page 4: Landing Gear
Fokker Dr.I 35” Page 3 end of the glued string and unwind the unglued string. You have evenly spaced cylinder fins. Paint with dope or polycrylic to fix the string. Repeat for 8 more cylinders. Glue the cylinders onto the motor core using the 1/8” notched piece for proper spacing. Don’t add the horns or hinge the surfaces until after covering is complete. LANDING GEAR Landing Gear Trial Fitting Paint the motor unit and add whatever detail you wish. Add some wire push rods to finish off the unit. Add washers to the top and left screws to get the proper down and right thrust for the motor. There is lots of room behind the cylinders to mount the ESC and nose weights. The landing gear is made from 1/16” music wire and is attached to plywood cross members in the fuselage using Kevlar thread threaded through holes provided. Use Epoxy or CA to strengthen the joint. Bass wood fairings securely bound to the uprights can add significant strength. It is also possible to fashion a shock‐absorbing axle by adding a second axle on top of the one that secures the undercarriage. Secure the floating axle in the center of itʹs span to the fixed axle with Kevlar thread and epoxy. Rubber bands are applied to both ends of this floating axle where the wheels attach act as shock absorbers. The bands should go around both the fixed and floating axle. Finally attach the wheels to the ends of the floating axle. TAIL SURFACES Lay out and glue parts of the tail surfaces on the plans. Tail Surfaces w optional horizontal stab center balsa omitted Copyright© 2005‐13 M.K. Bengtson All Rights Reserved Rev 04/13 ... - Page 5 Fokker Dr.I 35” Page 4 COVERING Any lightweight covering material can be used. Polyspan with dope or Minwax Polycrylic makes a good choice. Litespan is also popular. Decal outlines for this model are available on www.aerodromerc.com/decals in Adobe Acrobat pdf format for printing on decal paper. Contact paper used for kitchen shelf lining makes excellent decals. Print out the decal on paper, glue with a glue stick to the paper backing on the shelf paper, cut the decal out with an Exacto knife or micro scissors. Peel off the paper and Paper cones are cut out. Use a ballpoint pen to score each adhere to your model. Use black material for the crosses line on the back to make an impression of “spokes”. It is and white for the backgrounds. helpful to do this operation on a paper tablet so that the WHEELS pen makes a good crease. Fold the paper along the crease Gluing the ply sides on the 3/8” balsa core makes the basis lines to exaggerate the raised lines. One of the sections for the wheels. Use the brass hub for alignment. Epoxy forming a wedge is cut out. Make cuts to the center of the the hubs in place and add a sufficient amount of epoxy circle along a pair of the spokes. Close the paper cut out around the base of the hub to reinforce the connection of to form a cone and tape the joint inside the cone. the hub to the ply. Plywood reinforcing hubs are The inside cones may now be attached to the wheels. The provided that are to slip over the brass tubing as shown. outside cones may be attached at this point if wheel Next, CA glue the neoprene cording together to from a collars are to be used. Alternatively, after installing the “tire”. Use thin CA sparingly as the CA bonds very wheels on the landing gear, a washer may be soldered to aggressively to the rubber. Press the CA wetted ends hold the wheel in place and then the cone is attached. together for an instant bond. The best way to align the This method makes a very nice scale appearance. ends is to glue them while they are in place on the wheel. Then attach the tires to the wheels and CA in place. A ...
- Page 6 Fokker Dr.I 35” Page 5 ASSEMBLY The top of the fuselage between the middle wings can be finished in several ways: 1) Fashion 1/16th sheeting to cover most of the area using the top of the ply risers as a guide. Fill in gaps with balsa filler. 2) Use 1/4ʺ balsa and sand to shape. 3) Cover with card stock. 4) Fill with blue foam. The top wing is then epoxied onto the cabane assembly. However, the wing addition process should be done last. Fitting Tail Surfaces Attach the elevator to the horizontal stabilizer. The horizontal stabilizer and elevator are glued onto the fuselage first and then the rudder. The rudder should be Dry Fit Model securely attached to the fuselage, as the area is relatively small. Wings Adding Control Horns On the Pushrod Ends The bottom wing is attached to the fuselage through two Slip the control horns onto the wire pushrod ends and, spars connecting the two halves of the bottom wing. The with both the servos and the control surfaces centered, bottom wing should be attached first, making sure it is glue the horns into their slots. Some prefer to delay aligned properly with the fuselage. The spars are adding the rudder until the elevator control horn is designed to epoxy into the slots in the ply sides. Then secure. Then add the rudder and itʹs control horn. It add the IP strut to the middle wing (It has a top indicated makes the job a bit easier. by a T mark) and epoxy the middle wing to the ply sides using the spars and slots as a guide. Epoxy the bottom of Fitting the Rigging Wires the strut into the bottom wing. At this point, the top wing ...
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Page 7: Contact Information
Fokker Dr.I 35” Page 6 full throw, is needed at takeoff to prevent nose over. Climb outs look scale with this power system. Climb rate is good and it turns very quickly. Throws are 1/4ʺ aileron, 1/4ʺ elevator w/ stop to stop on takeoff and rudder stop to stop. The aileron and elevator are set up on dual rates. At these settings I found her to be very easy on me in the air once I figured out the over correction mistakes I was making. It flies at the pace of good run at 3/4 to full throttle.“ “Just got back from a second flight in a wind of about 7 mph. It flies pretty well, but needs much more aileron throw to get it to roll. Dual rates or expoʹs work well for this. Iʹve found short grass provides much more control over pavement during takeoff.“ FLYING The model should ROG on grass, pavement or hard The model also flies well with this power system: surfaces. Use full throttle and full up elevator on takeoff. GWS 400C ‐ F, 12x8 GWS HD and uses a 3S 1500 Mah Li‐ Once the model is airborne, ease off the elevator to poly battery. The John’s model weighs about 30 ounces. neutral. Let the model gain altitude slowly off the Note: John’s model used spruce spars. Balsa spars are runway. In flight, applying too much up elevator at slow now recommended. Several ounces of weight are saved speeds risks a stall. Make your turns gently as tight turns and the model retains structural integrity. risk tip stalling in any model. Don’t expect the elevator to make the model climb. Think of the elevator as a device CONTACT INFORMATION to change the attitude of the model. The wing and airspeed ultimately make the model climb. Often down Distributed by: elevator applied at stalling can avoid a major crash. Fly Bengtson Company ...