Stevens AeroModel Avro 558 Build Instructions

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Build Instructions

1923 Avro 558

A record setting motor glider from the 1923 Lympne light aircraft trials.

Wing Span: 33 inches | Wing Area: 205 square inches | Average Flying Weight: 7 ounces

Build Instructions - Version 1.24 (revised 08.21.2014)

Page 1

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Summary of Contents for Stevens AeroModel Avro 558

Page 1 A record setting motor glider from the 1923 Lympne light aircraft trials. Wing Span: 33 inches | Wing Area: 205 square inches | Average Flying Weight: 7 ounces Build Instructions - Version 1.24 (revised 08.21.2014) Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 1...
Page 2 Build Instructions WARRANTY Stevens AeroModel guarantees this kit to be free from defects in both material and workmanship at the date of purchase. This warranty does not cover any component parts damaged by use or modification. In no case shall Stevens AeroModel’s liability exceed the original cost of the purchased kit. Further, Stevens AeroModel reserves the right to change or modify this warranty without notice.
Page 3 Avro 558 - Background The Avro 558 biplane motor glider, was designed for the 1923 Lympne light aircraft trials. It is certain to delight, with it long slender lines and efficient glide. Two examples were built. The aircraft did not win the competition, but one later went on to establish a altitude world record for its class of 13,850 ft.
Page 4 Many of the suggested items listed below are available at your local hobby shop. For your convenience, Stevens AeroModel stocks all the power system components and most of the building supplies required to complete this kit. If you have difficulties sourcing any of these items locally, please visit our website, stevensaero.com to purchase the items necessary to complete the model.
Page 7 Please check our website for updates to these instructions before starting the build. To obtain downloads and updates to this model aircraft kit, please visit the product page at stevensaero.com Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 7...
Page 8 A small hammer may be used to assist in seating the nut. Bond by wicking small drops of medium CA around the flange on the nuts. Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 8...
Page 9 Build Instructions Neo-Magnet Step 1 Step 5 Bond Bottom Step 2 Step 6 Neo-Magnet Bottom Step 3 Step 7 Bond Step 4 Step 8 4-40 Blind Nut Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 9...
Page 10 Fit the ply strut mount plate F12 (sheet 12/12, 1/16 in. ply) to the slots in F1 immediately forward of former F10. □ Fit former F13 (sheet 12/12, 1/16 in. ply) to the next set of slots in F1, immediately forward of F12. Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 10...
Page 12 Cut the plastic retainers from the inside of the wheels (DUB200ML) supplied in the kit. Discard these retainers, they will not be used in this model. Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 12...
Page 14 With the wheels mounted, mark the landing gear wire 1/8 in. beyond the outer face of the □ each wheel. Remove the wheels and trim the wire at this mark. Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 14...
Page 15 Build Instructions Step 25 Step 29 Step 26 Step 30 Sand to a Streamlined Shape Step 27 Step 31 Step 32 1/8 in. Step 28 Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 15...
Page 16 Fit the scale motor mount F24-L (sheet 12/12, 1/16 in. ply) to the slots on the left side of F22. □ Fit F25-R (sheet 12/12, 1/16 in. ply) to the slots on the right side of F22. Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 16...
Page 17 Step 36 Back Washer Back Step 34 Step 37 Front Magnets on Right Side Step 38 F24-L Step 34 Cont. Step 35 Step 39 F24-L Neo-Magnets F25-R Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 17...
Page 18 Fit and bond doubler F30f (sheet 10/12, 1/16 in. balsa) to the notches at the bottom rear of the fuselage sides. Ensure that F30f is fully seated, leaving a recess to receive the tabs at the rear of F30. Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 18...
Page 19 Step 40 Step 44 Parallel Bottom View Step 41 Step 44 Cont. F26b Recess F26a Fuselage Bottom F30 Step 42 Step 45 Step 46 Recess Step 43 Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 19...
Page 20 Fit and bond former F34 (sheet 09/12, 1/16 in. balsa) to the slots at the rear of F1, ensuring □ that it is perpendicular to F1. □ Fit and bond former F35 (sheet 09/12, 1/16 in. balsa) to the slots in crosspiece F2e. Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 20...
Page 21 Build Instructions Bottom View Step 51 Step 47 Step 48 Step 52 Step 53 F32a Bottom F32b Step 49 Bottom View Step 54 Bottom Step 50 Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 21...
Page 22 1/2 in. Secure the tube at each former and the exit slot with medium CA. Trim the excess tube flush with the fuselage side at the exit slot. Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 22...
Page 24 □ Hold H6 against H5, and wick CA around the outer edges of the formers to bond them to each other. Remove the brace supporting H5. Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 24...
Page 25 Build Instructions Step 59 Cont. Step 62 Step 63 Trim Flush Step 59 Cont. Rear Portion of Notch Step 60 Step 64 Step 61 Step 65 Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 25...
Page 26 When both H10 and H11 are completely dry, remove the tape and final bond them to the hatch structure. Lightly sand the finished hatch, ensuring that the edges of H10 and H11 are flush with the lower surface of H1. Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 26...
Page 28: Tail Surfaces
□ of the spar. LW3 will fit in the outer portion of the slots, with LW4 occupying the inner portion. Ensure that LW2 is behind LW1. Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 28...
Page 29 Step 78 Slot Step 74 Step 79 LW1b LW1a LW1b Step 75 Step 80 Bottom 45 deg. Step 76 Rear View Step 77 Scrape Step 81 Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 29...
Page 30 Fit and bond the wing tip LW10(L) (sheet 03/12, 1/16 in. balsa) to LW9(L). □ □ Fit and bond wing tip trailing edge LW11(L) (sheet 03/12, 1/16 in. balsa) to LW10(L). Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 30...
Page 31 Center Wing LW5b LW3/4 Step 87 LW3/4 LW8b(L) LW9(L) Step 83 Step 84 Step 88 LW10(L) LW9(L) Rear View Step 85 Step 89 LW11(L) LW10(L) LW9(L) Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 31...
Page 32 Fit rib LW18 (sheet 01/12, 1/16 in. balsa) to the next set of slots in the spars outboard of rib LW7. Continue fitting ribs LW19 through LW23 (sheet 01/12, 1/16 in. balsa) in order, proceeding toward the wing tip. Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 32...
Page 33 Step 91 Step 93 Cont. LW12(L) Recess LW8(L) Rear View Step 91 Cont. Fit and Bond Step 94 Step 92 Step 95 LW13 LW14 LW18 LW15 LW23 Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 33...
Page 34 LW7. Hold the assembly down on a flat surface and bond the leading edge stock to the leading edge web and ribs with CA. Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 34...
Page 35 Step 97 Step 101 LW18 LW36 LW27 LW35 Step 98 Step 103 LW32 LW31 3/16 in. x 3/16 in. Stock LW30 LW29 Angled to Match Rib LW28 Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 35...
Page 36 Carefully align the holes in LW6 and LW37. Ensure the the rear of LW37 is flush with the rear of LW6, and does not overhang the trailing edge. Bond with CA. Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 36...
Page 37 Step 107 3/32 in. x 3/32 in. Stock Recess Inner Face Step 105 Inner Face Step 108 Contour Step 105 Cont. Step 110 Align Step 106 Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 37...
Page 38 UW3, engaging the center notch in UW6. □ 118. Fit ribs UW7 (sheet 01/12, 1/16 in. balsa) on the next set of slots on each side of rib UW3. Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 38...
Page 39 Step 115 Step 112 Step 116 1/4 in. Step 113 Step 117 UW1b UW1a UW1b Rear View Center Notch Step 118 UW1a Step 114 Rear View Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 39...
Page 40 CA. Fit the second turbulator spar the the set of notches in the front part of each rib. Align carefully, and bond. Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 40...
Page 41 Center of Rib UW9 Step 120 Step 121 Step 127 Leading Edge Notch Turbulator Spars Step 127 Cont. Turbulator Spar Turbulator Spar Notch Center of Rib UW9 Step 122 Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 41...
Page 42 Note that the notches in the spars are angled outward. Ensure that the ribs match this angle, and are fully seated within the spar notches. Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 42...
Page 43 UW14(L) UW16(L) UW22 Step 128 UW15(L) Step 132 UW23 Step 129 Step 129 Cont. Step 133 Fit and Bond Step 130 Step 134 UW29 UW30 UW31 Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 43...
Page 44 LW7. Hold the assembly down on a flat surface and bond the leading edge stock to the leading edge web and ribs with CA 142. Trim off the excess leading edge stock. □ □ Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 44...
Page 45 Step 139 UW24 UW32 UW39 Step 136 Step 141 UW36 UW35 L.E. Stock UW34 UW33 UW32 Trim Step 137 Step 142 UW37 Flush UW28 Against Trim Spar Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 45...
Page 46 148. Slide parts M7 (sheet 09/12, 1/16 in. balsa) M8, and M9 (sheet 11/12, 1/8 in. balsa) in order from the motor block out, onto each side of the aluminum tube. Bond with CA. Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 46...
Page 47 Step 143 Step 143 Cont. Step 147 Cont. Recess Front View Step 144 Step 148 Step 144 Cont. M7 M8 M9 M9 M8 M7 Step 148 Cont. Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 47...
Page 48: Final Assembly
153. Cover the upper wing with a lightweight, high quality covering material. We recommend AeroLITE , available from stevensaero.com. Only two examples of the Avro 558 were built, and both were finished in overall silver with black registration markings. Leave the top of the wing center section uncovered at this time.
Page 50 Ensure that the velcro does not interfere with the rim of the hatch. Wick a little CA around the edges of the velcro to further secure it to F1. Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 50...
Page 51 Build Instructions Step 156 Cont. UW11 Step 159 Step 156 Cont. Step 160 UW10 Step 157 Step 161 Step 162 Step 158 Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 51...
Page 52 ESC. When you are satisfied that the motor is turning in the correct direction, power down the system and disconnect the ESC from the receiver. Mount the recommended propellor to the motor. Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 52...
Page 53 Build Instructions Step 163 Step 167 Step 164 Step 168 Step 165 Step 169 Step 166 Step 170 10 Amp SA Sport Park BL250 GW/EP6030 Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 53...
Page 54 175. Connect the servos and ESC to the receiver. Feed the receiver and associated wiring back through the opening in former F9. This will free the servo arms to move without any interference. Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 54...
Page 55 Build Instructions Step 171 Step 173 Step 171 Cont. Step 174 Step 171 Cont. Step 175 Step 172 Step 175 Cont. Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 55...
Page 57 Step 181 Step 177 Step 181 Cont. Step 178 Step 182 Bevelled Side Down Step 180 Bottom View Bottom View Lower-Left Side of Elevator Bevel Step 183 Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 57...
Page 58 Position the cabane struts on the outside of the strut mount tabs. Mount the struts to the tabs using the four #0 x 3/16 in. screws supplied in the kit. Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 58...
Page 59 Bottom View Step 189 Pockets Bond Top View Upper Wing Step 186 Bottom View Pockets Right Side of Rudder Step 190 Step 187 Step 191 Bottom View Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 59...
Page 60 Congratulations, your Avro 558 is complete!! Admire your work of art, then proceed to the Setup and Pre-Flight sections to prepare your Avro 558 for it’s first flight.
Page 61 4-40 x 1/2 in. Nylon Screw Step 192 Bottom View Bottom View Step 197 UW30 Complete! Bond Bond LW25 Step 194 Step 195 Complete! Step 196 Avro 558 - Build Instructions © 2014 Stevens AeroModel, all rights reserved.! Page 61...
Page 62 Check Weather - The first flight should be outdoors in calm wind conditions. The Avro 558 is a joy to fly in winds up to 10 miles per hour.
Page 63 Congratulations! Once you’ve completed your first flights, you will have noticed that the Stevens AeroModel 1923 Avro 558 is a very stable model airplane. When built straight, and trimmed for level flight, it should readily return to “wings level”...

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Summary of Contents for Stevens AeroModel Avro 558

Page 28: Tail Surfaces

Page 48: Final Assembly