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Albatros DVa 54"
R/C Scale Model Instructions
CONTACT INFORMATION
Designed by Kurt Bengtson
Prototype by Dave Ottney
Manufactured and Distributed by:
Bengtson Company
Pacific Grove CA 93950
Phone and Fax: 831‐393‐0991
e‐mail: sales@aerodromerc.com
www.aerodromerc.com
Copyright© 2005 Kurt Bengtson All Rights Reserved Rev 10/05
PO Box 51102
Albatros DVa 54"
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Summary of Contents for Bengtson Company Albatros DVa 54"
- Page 1 Albatros DVa 54” Albatros DVa 54” R/C Scale Model Instructions CONTACT INFORMATION Designed by Kurt Bengtson Prototype by Dave Ottney Manufactured and Distributed by: Bengtson Company PO Box 51102 Pacific Grove CA 93950 Phone and Fax: 831‐393‐0991 e‐mail: sales@aerodromerc.com www.aerodromerc.com Copyright© 2005 Kurt Bengtson All Rights Reserved Rev 10/05 ...
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Page 2: Building The Model
Albatros DVa 54” Page 1 Laser cut IP struts (can be used as templates for bass or Albatros DVa spruce) Thank you for purchasing the 54” Albatros DVa model for Laser cut tail parts included electric flight. BUILDING THE MODEL THE MODEL Before Starting A note about the photos: The photos were taken of a prototype and the parts supplied may look slightly different from them. However, the concepts illustrated are the same. WINGS Wing Construction Pin down, over the plan, the t/e, spars and wing tip, gluing as required. Add the leading edge stock after the basic frame is done as the stock is inserted in a rotated fashion. Add the wing tips and align the front tip along the center Finished Model by Dave Ottney of the leading edge. Sand the leading edge stock to be A semi scale adaptation of the Albatros DVa, this model is rounded and meet the ribs. designed to be easy to build and exciting to fly. POWER SET UP The model is powered by the Mega 22/20/2 with MEC gearbox and a 14x7 prop. Battery power pack is a 10cell 1700 maH Nicads or an equivalent weight Nimh SPECIFICATIONS More than 290 laser cut parts Scale: 15% scale Top Wing Construction Detail Channels: R/E/A/T Wingspan: 54ʺ Wing Area: 718 sq in Prop: 14x7 ... -
Page 3: Fuselage Construction
Albatros DVa 54” Page 2 Aileron Construction Detail The leading edge of the aileron is rounded over with Left Plywood Riser in Place sandpaper to make the aileron movable with a minimum gap. The trailing edge of the wing in that section is left flat. IP strut attachment points are made from a lamination of three plywood ribs. Two outer 1/8” ply ribs are attached to a 1/32” ply core. Dubro landing gear straps are used to serve as attachment points and are epoxied into the slots provided in the 1/32 plywood. Left Fuselage Construction Detail Finishing the left side and stringers The frame is removed from the building board. Glue the right side F2 and F7 former carefully and add the side keel as before. The formers are glued to the frame using the left side as a guide. Be sure that the internal ply risers are in place early in this stage of construction or there will not be room to add them later. They are labelled to insure that IP Attachment assembly right motor thrust is built into the fuselage. The down thrust is also built in due to the top and bottom FUSELAGE CONSTRUCTION keels. Attach the F1 motor mount former and the fuselage The fuselage is of former and keel construction with two is ready for the stringers. Attach stringers alternately left internal ply risers that serve to fix the cabane attachment and right in a symmetrical fashion to avoid a banana points, undercarriage attachment points, motor mount, fuselage. The stringers serve as support for the lower wing and battery into a unified structure. sheeting/planking process. Building the Fuselage ... - Page 4 Albatros DVa 54” Page 3 Adding the Undercarriage mounts Fuselage Ready for Stringers 1/16 balsa sheeting required over the stringers. The balsa sheets that Dave used in the prototype proved to be difficult to conform to the compound shape of the Undercarriage Mount fuselage. Dave got around this by adding additional stringers. There are places where the stringers interfere The undercarriage is mounted using brass tubing epoxied with the cabane and lower wing placement. This is not a into basswood mounted to cutouts in the internal problem as after the sheeting/planking is applied, they are plywood sides. superfluous anyway. Just cut them out as needed. The stringers are there for support of the sheeting/planking Note: The kit now contains a second 1/16” plywood only. former to be laminated to the motor mount. If sheeting is to be used and to avoid the difficulties that Dave had in sheeting, choose the lightest balsa. Cut to a rough shape and soak in hot water then bind to the fuselage with paper towel and rubber bands or tape and let dry. This should set a curve in the balsa. Motor Mount w Brass Tubing Fuselage with Stringers Use blue/pink Styrofoam for the tail end of the fuselage. Sand the foam to shape. It too can be covered in balsa. ...
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Page 5: Tail Surfaces
Albatros DVa 54” Page 4 TAIL SURFACES Lay out and glue parts of the tail surfaces on the plans. Vertical Stabilizer and Rubber The vertical stabilizer can be sheeted with 1/16 balsa. Landing Gear Detail Sand the tail parts, rounding off all edges. Don’t add the Attach the second axle in the center of both axles with horns or hinge the surfaces until after covering is wire and solder. Then use rubber bands at the ends where complete. the wheels attach to provide the shock resistance for the freely moving axle and wheel (not shown). DUMMY MOTOR Assemble the dummy motor from the balsa parts supplied and sand to shape. Solid 16 gauge copper electrical wire (black insulated) makes an excellent “radiator hose”. Dave fashioned a hatch under his dummy motor for access to his motor and gearbox. Note: The kit now includes a removable dummy engine for additional access to the fuselage. Horizontal Stabilizer Laid Out On Plans LANDING GEAR The landing gear is made from 1/8” music wire and inserted into the brass tubing inside the fuselage. 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. Dummy Motor Copyright© 2005 Kurt Bengtson All Rights Reserved Rev 10/05 ... - Page 6 Albatros DVa 54” Page 5 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 adhere to your model. Use black material for the crosses and white for the backgrounds. WHEELS Gluing the ply sides on the balsa core makes the basis for Spinner Components the wheels. Use the brass hub for alignment. Epoxy the The spinner is composed of fiberglassed blue foam. The hubs in place and add a sufficient amount of epoxy spinner is made from blue foam which is tack glued to a around the base of the hub to reinforce the connection of piece of 1/32” ply. Epoxy a short 1/4” diameter dowel to the hub to the ply. Plywood reinforcing hubs are provided the back in the center of the disk. that are to slip over the brass tubing as shown. Next, CA glue the neoprene cording together to from a “tire”. Use Place the assembly in a drill chuck and sand the foam to thin CA sparingly as the CA bonds very aggressively to shape while it spins. Glass the foam using standard the rubber. Press the CA wetted ends together for an glassing techniques. instant bond. The best way to align the ends is to glue them while they are in place on the wheel. Then attach the When the epoxy is ready, cut the excess fiberglass away. tires to the wheels and CA in place. A thin bead of CA Then remove the plywood and carve out the necessary around the rim makes for a secure tire. recess for the propeller. Drill out the dowel on the Paper cones are cut out. Use a ball point pen to score each plywood disk. Glue the spinner to the plywood disk after ...
- Page 7 Albatros DVa 54” Page 6 INSTALLING THE RADIO CONTROL GEAR ASSEMBLY Servo Bay Wing Get the R/C gear fitted at this stage, and also the motor. Aileron Servos Aileron servos are mounted in wing and attached with short threaded rods to the ailerons. Battery Tray After all the above has been placed, mount the battery tray made from 1/8” balsa and use the battery position to balance the model as shown on the plan. Mounting/Aligning Bolts on Wing Panels The lower wing is attached to the fuselage through two 8‐ 32 nylon bolts that screw into blind nuts in the ply ribs located in the bottom wing. The cabane struts are made from 3/32” music wire and are formed using the plywood cabane strut fairing as a guide. After soldering the ring terminals on the upper portion of the music wire, and for assembly, bind the ply fairing to reinforce the struts. Use thin CA to harden the plywood. IP struts are made from a lamination of three‐ply pieces. Two outer 1/8” ply sides are attached to a 1/32” ply core. Small 1/32” ply reinforcements are added to the ends. Battery Placement Wing Attachment Construction Detail Copyright© 2005 Kurt Bengtson All Rights Reserved Rev 10/05 ...
- Page 8 Albatros DVa 54” Page 7 Dubro landing gear straps are used to serve as attachment Fitting the Rigging Wires points and are epoxied into the ply ribs as described Use strong thread or Kevlar fishing line or elastic beading earlier. cording to simulate rigging wires. Use small screws, fishing hook eyes, straight pinheads or small eyelets to attach the lines. These “wires” can add a degree of strength to your model. Windsock Datafiles “Albatros Fighters “ publication has details on placement and markings. Available at http://www.aeroplanebooks.com/ Battery hatch Fashion a battery hatch from soft balsa. Sand IP Struts to shape and secure with nuts and bolts. Fitting Tail Surfaces The horizontal stabilizer is in two halves and has tabs that fit into slots in the side of the fuselage. Insert the two halves, and dry fit the elevator using CA hinges. The elevator serves as an alignment tool so that the horizontal stab can be CA glued in place. The vertical stabilizer also fits into a slot in the top of the fuselage formed in F7. Adding Control Horns on the Pushrod Ends Battery Hatch Detail Slip the control horns onto the wire pushrod ends and, with both the servos and the control surfaces centered, Balancing the Model glue the horns into their slots. Balance the model at the point shown. It is best to position the battery to do this operation. FLYING The model should ROG on grass, pavement or hard surfaces. The model may require coordinated turns using both ailerons and rudder control. This is due to adverse yaw. Halving the aileron down throw may reduce this ...
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Page 9: Contact Information
Albatros DVa 54” Page 8 straight flight. During a couple of circuits I found that pure rudder turns with the appropriate elevator input made for very smooth turns. I took it up higher and throttled back applying full up to see what the stall would be. One shutter and it “mushed” straight forward regaining speed and lift. I kind of figured it would be like that, so landings would be simple as it turns into a real floater when slowed down. As with the other planes Iʹve done for Kurt, this one is a real nice flier. I didnʹt attempt any scale aerobatics but Iʹm sure it will be capable of loops, very ʺbarrellyʺ rolls and Finished Model by Dave Ottney nice stall turns. Again its slow speed characteristics relieve the fear of coming close to the ground. I also think that if Let the model gain altitude slowly off the runway. you wanted to try something like a Magnetic Mayhem or Applying too much up elevator at slow speeds risks a Endoplasma geared like in the E3D, it would work well stall. Make your turns gently as tight turns risk tip with this plane. Iʹve flown these systems also and I think stalling in any model. Don’t expect the elevator to make this plane would be fine with them‐ nice economical the model climb. Think of the elevator as a device to alternative. “ change the attitude of the model. The wing and airspeed ultimately make the model climb. Often down elevator CONTACT INFORMATION applied at stalling can avoid a major crash. The most important details for proper flight operations are: Distributed by: 1) CG location. Tail heavy models never fly well or at all. Bengtson Company ...