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Mountain Models Flashback Manual

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Flashback Specifications
Wingspan: 36in. (91cm.)
Length: 36 in. (91cm.)
2
2
Wing Area: 265in
(1710cm
)
Weight (without battery): 12oz. (340g.)
2
Wing Loading (depending on battery): 8.5 – 10.0oz/ft

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Summary of Contents for Mountain Models Flashback

  • Page 1 Flashback Specifications Wingspan: 36in. (91cm.) Length: 36 in. (91cm.) Wing Area: 265in (1710cm Weight (without battery): 12oz. (340g.) Wing Loading (depending on battery): 8.5 – 10.0oz/ft...

  • Page 2: Revision History

    Revision Notes/Comments 10/04/03 Document initial creation. Thank you for purchasing the Flashback. This plane is an aileron/elevator/rudder (full house) setup, designed for the intermediate to advanced pilot who wants a plane with outstanding performance that will fly in a limited space.

  • Page 3: Before You Begin

    Before You Begin Before you begin building your Flashback make sure you read and understand all of the instructions thoroughly. Additionally, you will need to have the following items. Check to make sure that all of your parts are there and in good shape, and review a couple quick building tips to make this whole process go quicker and easier.
  • Page 4 Figure D: 1/16” laser cut balsa sheet Figure E: 3/32” laser cut balsa sheet Figure F: 1/16” laser cut balsa sheet Figure G: 1/16” laser cut balsa sheet Figure H: 1/16” laser cut balsa sheet Figure I: 1/8” laser cut balsa sheet Mountain Models Flashback...
  • Page 5 Figure J: 1/32” laser cut balsa sheet Figure K: 3/32” laser cut balsa Figure L: 1/8” laser cut balsa sheet Figure M: 1/64” plywood sheet Figure N: 1/4” laser cut balsa for cowl Figure O: 1/16” plywood sheet Mountain Models Flashback...

  • Page 6: General Building Tips

    If you want to remove the charred edges caused by the laser cutting process, dampen a cloth with bleach and gently rub the affected areas. Removing the char will not increase the strength but will make it look better. Mountain Models Flashback...
  • Page 7 Assembly Instructions Okay, so now you are ready to actually build the Flashback. If you follow these simple instructions, we can have you flying in no time! The Entire Process Demystified Step 1: Prepare your workspace for assembly. Step 2: Assemble the fuselage.
  • Page 8 You may find that you need to carefully trim the extra pieces of wood that originally held the piece to the sheet. Using the notches and grooves on each fuselage side, position them as shown in the following picture. Mountain Models Flashback...
  • Page 9 This includes making sure that the doublers are mirror images. But don’t worry, we’re coming to the rescue, the pictures below show both sides just so there’s no confusion… For each fuselage side, you will need: • Fuselage Doubler (Figure B) Mountain Models Flashback...
  • Page 10 You will find that if the doubler is in the wrong spot, the larger oval slot in both the doubler and the fuselage side will not line up. Make sure everything is lined up, including the wing opening, the larger oval slot, and the outside edge, and then glue the fuselage doubler into place. Mountain Models Flashback...
  • Page 11 Attaching the final set of fuselage doublers Line up one of the fuselage doublers from Figure E with the slots and the top and bottom fuselage edges. Fuselage doublers Mountain Models Flashback...
  • Page 12 You will be using all of the fuselage bulkhead pieces shown, but these pieces are also going to be shown again for each step, highlighted so you know which pieces are being used at each step. Mountain Models Flashback...
  • Page 13 Line up the arch of the reinforcement piece with the top edge of the F4 bulkhead. Do NOT line up the tabs along the side the reinforcement piece; instead use only the arch section of the pieces for this purpose. Bulkhead reinforcement Mountain Models Flashback...
  • Page 14 Wipe off any excess glue. We recommend using paper towel to wipe off the excess, as compared to clothing or flesh, but hey, really that’s your call. Mountain Models Flashback...
  • Page 15 Line up all of the available edges of the landing gear spacer to the F3 bulkhead, and then glue the pieces together. Attaching the Bulkheads to the Fuselage Bottom In order to attach all of the bulkheads to the fuselage bottom, you are going to need: • Fuselage Bulkhead F2 (Figure O) Mountain Models Flashback...
  • Page 16 Position the F4 bulkhead into the appropriate fuselage slots as shown in the following picture, making sure that the doubler is facing aft (towards the tail), and then glue it into place. Mountain Models Flashback...
  • Page 17 F4 bulkhead. The piece will now be on an angle with the opposite side resting against the F5 bulkhead. Carefully flex the F5 bulkhead so that you can gently push the servo tray down into the three slots of this bulkhead. Mountain Models Flashback...
  • Page 18 Attaching the left fuselage side Line up the left fuselage side with the left sides of the bulkheads, pushing everything gently into place as you move down the fuselage. Make sure that the doublers are facing the inside of the fuselage. Mountain Models Flashback...
  • Page 19 Glue it into place. Position the larger balsa brace in front of bulkhead F2, into the slot parallel to the fuselage bottom. Don’t glue this into place yet, you will do that after you attach the F1 bulkhead. Mountain Models Flashback...
  • Page 20 F2 and F4. Do not glue beyond bulkhead F4 yet. There are a couple more braces to put in place and it will be much harder if the pieces are glued. Mountain Models Flashback...
  • Page 21 Making sure that the braces you just positioned are flush with the fuselage sides, glue them into place. Smaller brace Larger brace Attaching the F1 Bulkhead Next, you are going to attach the F1 bulkhead. To do this, you will need: • 1 Plywood bulkhead F1 (Figure O) Mountain Models Flashback...
  • Page 22 Position and connect the bottom of the fuselage with the F1 bulkhead using the tabs and slots, and then glue it into place. Make sure that all the fuselage joints around bulkhead F1 and F2 are securely glued, including gluing the remaining fuselage brace in front of F2. Mountain Models Flashback...
  • Page 23 Make sure that they are centered within the fuselage, and then glue into place. Attaching the Rear Bulkhead Stringer Okay, so now you are ready to attach the rear bulkhead stringer. Only a few more steps and you can move on to the wings… You will need: Mountain Models Flashback...
  • Page 24 Once the mount is dry, lightly sand its outside surface so that the motor slides on snugly, but is not overly tight. Slide the motor mount through the square motor mount support cutouts, making sure that the rear of the mount is flush with the back of the rear support. Mountain Models Flashback...
  • Page 25 Secure the piece into position using five rubber bands, one at each bulkhead. Let the sheeting dry completely. Glue the underside of the sheeting where it meets each bulkhead, and to the outside edges of the fuselage sides. Mountain Models Flashback...
  • Page 26 Once the glue is dry, trim the edges so they are flush with the front of the F1 bulkhead and the rear of the F2 bulkhead, and then remove the rubber bands. Assembling and Attaching the Cowl • 3 cowl pieces (Figure N) Mountain Models Flashback...

  • Page 27: Step 3: Assembling The Wings

    Assembling the Wing Spars and the Trailing Edge For this section, you are going to assemble the vertical spars, the top and bottom spar caps, and the leading edge. Mountain Models Flashback...
  • Page 28 Make sure all of the slots on the vertical spars are facing the same direction. This is EXTREMELY important due to the slight dihedral in the wings. Glue the vertical spar joint, and then repeat for the two remaining vertical spars. Notch and groove assembly Mountain Models Flashback...
  • Page 29 Position the pieces by aligning the notch and groove, forming one long spar, and then glue the pieces together. Notch and groove assembly Repeat for the two remaining spars. Assembling the Trailing Edge You will need: • Trailing edge (Figure I) Mountain Models Flashback...
  • Page 30 Once everything is in place, THEN you’ll glue it all together. Positioning the Wing Ribs You are going to need: • 14 Wing ribs (Figure H) • Vertical spars (previously assembled) • Top and bottom spar caps (previously assembled) Mountain Models Flashback...
  • Page 31 Here’s where you to need to understand what’s the top and bottom of the wing, based on the dihedral. Place the wing onto your workspace and take a look at it; when the bottom is down, the wing tips should be slightly elevated. Mountain Models Flashback...
  • Page 32 Position the trailing edge along the wing ribs, lining up the slots with the tail of each rib. Trailing edge Make sure everything is aligned and flush, and then glue all of the joints with thin CA. This includes the wing ribs, vertical spars, top and bottom spars, and the trailing edge. Mountain Models Flashback...
  • Page 33 You may need to trim the hardwood dowel where it goes into the center leading edge. Glue the center leading edge piece to the wing ribs using thin CA, but use thick CA to glue it to the dowels. Mountain Models Flashback...
  • Page 34 W i n g t i p Assembling the Aileron Servo Block You are going to assemble the aileron servo block, which will be used to house the aileron servo in a later section. Mountain Models Flashback...
  • Page 35 The first things that you are going to assemble are the stabilizers, rudder, and elevator. When assembled, these are also known as the tail feathers. Assembling the Horizontal and Vertical Stabilizers To assemble the horizontal and vertical stabilizers, you will need: • Horizontal Stabilizer(Figure E) Mountain Models Flashback...
  • Page 36 Avoid beveling the indented area on both sides Now you can set both this and the vertical stabilizer aside until you attach the tail feathers. Mountain Models Flashback...
  • Page 37 Bevel two 45 ° angles into the leading edge of the rudder to form a “V” shaped point. If it’s easier to think about it this way, it should be 45 ° to the center on both sides, which will cause a point to appear. Mountain Models Flashback...
  • Page 38 Bend the 1/32” x 18” wire following these steps and referring to the plans: Needle nose pliers work pretty well to shape the wire. Put a 90 ° bend into the wire 3/8” in from the end. From that bend, go in 1/2” and create a slight 45 ° bend. Mountain Models Flashback...
  • Page 39 Using a ½” strip of the CA hinge material, wrap it around the rudder and the tail wheel wire, and then glue into place. Assembling the Elevator To assemble the elevator, you are going to need the following pieces: • Elevator Assembly (Figure K) Mountain Models Flashback...
  • Page 40 Trim the dowel to fit if necessary. Glue the dowel into place with thick CA. Dowel connecting the two elevator halves together. Step 5: Assembling the Ailerons Okay, so this stage where you are going to assemble the ailerons. You’re going to need: Mountain Models Flashback...

  • Page 41: Step 6: Assembling The Landing Gear

    Step 6: Assembling the Landing Gear At this point you are ready to begin assembling the landing gear. You will need: • 2 plywood landing gear reinforcements (Figure M) Mountain Models Flashback...
  • Page 42 Insert the landing gear wire into the landing gear mount. Position the other plywood landing gear reinforcement over the top of the balsa and plywood landing gear assembly you have created, making sure all of the edges line up, and then glue them together. Mountain Models Flashback...
  • Page 43 Using a fine point marker, mark the front, sides, and rear of the plastic canopy where it meets the canopy mount. Basically, trace an outline of the canopy mount onto the plastic canopy. Cut out the plastic canopy, using the marks you created above. Mountain Models Flashback...
  • Page 44 200 grit sandpaper for sanding What to Sand This is a fairly small chore for the Flashback; apparently the air prefers sharp edges to rounded ones, so we aren’t going to round any of the pieces. Mind you, by sharp edges we don’t mean pokey bits, you ARE going to have to sand those, we just mean non-...
  • Page 45 Using a tack cloth, carefully remove the balsa dust once you are done sanding. • Covering the Flashback Determine what material you’ll use to cover, we recommend using Solite covering material since it is extremely lightweight and won’t crush the fragile balsa when shrinking.
  • Page 46 CA hinges. Also within this section we are going to install the elevator and rudder servos, and route the pull- pull system. Once you’re done with this entire step, you will have a finished tail feather section! Mountain Models Flashback...
  • Page 47 You can check that the horizontal stabilizer is perfectly centered by measuring the distance from the outermost point of the horizontal stabilizer trailing edge to the rear of the fuselage on both sides; the numbers should match. Mountain Models Flashback...
  • Page 48 Mark a line on the sheeting to show where the vertical stabilizer will sit. GENTLY cut and remove the covering from between the marks. Be EXTREMELY careful that you are only cutting the covering and not the wood when you’re doing this, since scored wood is weak wood. Mountain Models Flashback...
  • Page 49 Position the two hinges into their slots on the vertical stabilizer, and then maneuver the rudder so that one by one, the hinges can be lined up and slid into the slots in the rudder. Glue the hinges into place. Rudder Mountain Models Flashback...
  • Page 50 Attach the ailerons to the wing with 3/4” packing tape. Make sure that you pay attention to which is the left and right aileron when you are attaching them to the wings. The aileron control horn needs to face towards the nose of the plane. Mountain Models Flashback...
  • Page 51 Elevator servo Rudder servo (on the spacers) Step 12: Attaching the Control Horns Next, you are going to attach all of the control horns, you will need: Mountain Models Flashback...
  • Page 52 Tie one end of the thread to one of the cotter pins, seal the knot with thin CA, and then remove the extra material. Feed the cotter pin through the opening, and then guide it through the fuselage toward the servo tray. Mountain Models Flashback...

  • Page 53: Step 13: Installing The Aileron Servo

    Getting the pushrod through the fuselage is a bit difficult. You're going to have to flex the wire to get it into the proper position. Center the aileron and then tighten the pushrod adjuster over the pushrod. Repeat Steps 3-7 for the second pushrod. Mountain Models Flashback...

  • Page 54: Step 14: Installing The Motor

    Screw in the motor retaining screw. Step 15: Attaching the Receiver and Speed Controller We are not going to cover the receiver and speed controller (ESC) specific information, please refer to your manufacturer’s instructions for more information, if necessary. Mountain Models Flashback...
  • Page 55 Attaching the Tail Wheel This is one of those highly overlooked, but extremely important pieces if you want your backend to remain in one piece. For the Flashback we are using a tail wheel. You will need: •...
  • Page 56 F2 bulkhead. Secure the back of the battery mount to the 1/16” plywood fuselage battery mount brace, using a #2 x 3/8” screw. Attach the soft side of the Velcro strip to the bottom of your battery pack. Mountain Models Flashback...
  • Page 57 Close the canopy and press it down until it's flush with the fuselage. The tack will be pushed to the correct height into the stick. Wait for the CA to set up. Mountain Models Flashback...
  • Page 58 On the other hand, too far back and the plane will be hard to control, requiring constant input to keep the plane flying straight and level. For the Flashback, refer the position shown on the plans. Use this as a starting point, you can slowly move it back as you get more comfortable with the plane.
  • Page 59 A Few Pattern Flying Maneuvers Half Cuban Eight Knife Edge Mountain Models Flashback...
  • Page 60 Immelmann Turn Modified Immelmann Turn Mountain Models Flashback...
  • Page 61 Humpty Bump Hammerhead * Pattern flying images are brought to you in part, from the Dundee Model Aircraft Club Web site, http://www.dmac.org.uk. All images have been modified. Mountain Models Flashback...
  • Page 62 If You Own/If You Rent 50 hours $13,583.07/$5,000.00 100 hours $15,573.07/$10,000.00 150 hours $17,563.07/$15,000.00 Or you can continue with your R/C airplane building hobby. See if THIS doesn’t smooth things over next time you want to buy a new kit!! Mountain Models Flashback...