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Mountain Models Tantrum Instructions Manual

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Tantrum Specifications
Wingspan: 37in. (94cm.)
Length: 37in. (94cm.)
2
2
Wing Area: 370in
(2388cm
)
Weight (without battery): 10oz. (255g.)
Wing Loading (depending on battery): 5.0 – 6.0oz/ft
2

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  • Page 1 Tantrum Specifications Wingspan: 37in. (94cm.) Length: 37in. (94cm.) Wing Area: 370in (2388cm Weight (without battery): 10oz. (255g.) Wing Loading (depending on battery): 5.0 – 6.0oz/ft...

  • Page 2: Revision History

    Revision Notes/Comments 6/1/03 Document initial creation. Thank you for purchasing the Tantrum. This plane was designed for the pilot who wants something more than the everyday parkflyer, and that when using proper mixing, is 3D capable. Please keep in mind that this plane is an aileron/elevator/rudder (full house) setup, intended for the intermediate to advanced pilot.

  • Page 3: Before You Begin

    Before You Begin Before you begin building your Tantrum 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 C: 1/16" laser cut balsa sheet Figure D: 1/8" laser cut balsa sheet Figure E: 1/16" laser cut balsa sheet Figure F: 1/16" laser cut balsa sheet Figure G: 1/16" laser cut balsa sheet Figure H: 3/32" laser cut balsa sheet Mountain Models Tantrum...
  • Page 5 Figure K: 1/16" laser cut plywood sheet Figure L: 1/16" laser cut plywood sheet Figure M: 1/64" plywood sheet Figure N: 5/16" laser cut balsa for cowl Figure O: 1/4" square x 18” balsa leading edge (x 2) Figure P: 1/64" plywood sheet Mountain Models Tantrum...

  • 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 Tantrum...
  • Page 7 Assembly Instructions Okay, so now you are ready to actually build the Tantrum. 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 stabilizers, rudder, and elevator.
  • Page 8 The glue will be wicked into the balsa to form a secure bond, so it won't take much glue to do this. Make sure that you are only working on one joint at a time, and that the pieces are firmly connected before moving to the next joint. Mountain Models Tantrum...
  • Page 9 Assembling the Vertical Stabilizer The process for the vertical stabilizer is pretty much the same as for the horizontal stabilizer; therefore, the following section is mostly for reference purposes, so you can refer to the pictures as necessary. Mountain Models Tantrum...
  • Page 10 Once the parts are dry, carefully remove them from the wax paper. ° Bevel the entire leading edge 45 . This should ONLY be done on one side of the piece. Mountain Models Tantrum...
  • Page 11 In other words, once the elevator halves are together, simply flip one over, so it is the mirror image of the other one. Glue the joints for each of the elevator halves, using thin CA. Mountain Models Tantrum...
  • Page 12 Glue all of the joints, following the process described for the horizontal stabilizer. Once the parts are dry, carefully remove them from the wax paper. Remove the Aileron 2 pieces shown in black from the balsa sheet. Aileron 2 Mountain Models Tantrum...
  • Page 13 Attaching the Wing Root and Tip Ribs to the Vertical Spar For each wing, you will need: • 1 wing tip rib (Figure B) • 1 vertical spar (Figure C) Mountain Models Tantrum...
  • Page 14 This is where you can begin assembling the second wing, making sure that it's a mirror image of the first one. Did I mention that this was important?? Wing tip rib Wing root rib Mountain Models Tantrum...
  • Page 15 Putting the pieces together • While you are still holding the vertical spar with the slots towards the ceiling, wing rib slot with the remaining cutouts, and then slide them into match up each place. Wing ribs from Figure E Mountain Models Tantrum...
  • Page 16 This is so that the CA doesn't over saturate the wood and cause strength issues down the road. Attaching the Spar Caps For each wing, you will need: • 2 spar caps (Figure F) Mountain Models Tantrum...
  • Page 17 The Tantrum is meant to be a lightweight plane, so make sure you use the CA as sparingly as possible, but you shouldn’t sacrifice strength for weight.
  • Page 18 Trailing edge Make sure that everything lines up, push the trailing edge firmly against the ribs, and then glue the joints. Attaching the Leading Edge For each wing, you will need: • 1/4" leading edge balsa stick Mountain Models Tantrum...
  • Page 19 Sanded leading edge, shown on wing tip side Attaching the Aileron Servo Mount For each wing, you will need: • 1 plywood aileron servo mount (Figure P) Mountain Models Tantrum...
  • Page 20 Using the other servo screw reinforcement, perform the same process as Step 1, using the other available hole on the servo mount. Mark a line 1/4" on the servo mount, following the guide shown below. Aileron Servo Mount with Line Guidance Mountain Models Tantrum...
  • Page 21 Upper spar cap Balsa servo mount reinforcement piece Attaching the Wing Reinforcements For each wing, you will need: • Wing reinforcements – 3 Long, 1 Short (Figure H) Mountain Models Tantrum...
  • Page 22 Topside of the Wing Tip Side: Using the last of the long wing reinforcement pieces, butt it up against the trailing edge, making sure that the “fingers” are meshed with together with the wing reinforcement you glued in Step 4. Mountain Models Tantrum...

  • Page 23: Step 5: Assembling The Fuselage

    Fuselage pieces (Figure I) • Matching fuselage pieces (Figure H) Each fuselage side is on a different balsa sheet. The first side uses all of the remaining pieces from Figure I, while the second side uses the Mountain Models Tantrum...
  • Page 24 The following image shows the bulkheads with codes that will be referred to on both the plans and in this section. Attaching the Fuselage Tail The fuselage tail attaches at the rear of the fuselage bottom. Mountain Models Tantrum...
  • Page 25 Glue the fuselage tail in place. Reinforcing Bulkhead F2 You will need to reinforce the F2 bulkhead, using pieces you remove from these balsa sheets: • Bulkhead F2 (Figure C) • Bulkhead Reinforcement (Figure G) Mountain Models Tantrum...
  • Page 26 Position the top bulkhead reinforcement from Figure G onto the front of bulkhead F2, matching the curve and notches, and then glue it into place. Top bulkhead reinforcement - Front Position the F2 bulkhead into the slot on the fuselage bottom, as shown in the following picture. Mountain Models Tantrum...
  • Page 27 Position the bottom bulkhead reinforcement from Figure F over the top of the reinforcement piece you glued on in Step 5, match up the edges, and then glue it into place. Bottom bulkhead reinforcement, on top of previous piece Mountain Models Tantrum...
  • Page 28 Attaching the Battery Mount Support to Bulkhead F3 The battery mount support attaches to bulkhead F3, and requires only one piece from Figure L. • Bulkhead F3 (Figure E) • Plywood Rear Battery Mount Support (Figure L) Mountain Models Tantrum...
  • Page 29 Position the F3 bulkhead into the slot on the fuselage bottom, as shown in the following picture. For additional strength, you may want to flow CA into the holes in bulkhead F3, these are going to be used for routing the pull-pull cables later. Mountain Models Tantrum...
  • Page 30 Before you begin assembling, you need to flow thin CA around the lightening holes of the F6 bulkhead. This is to strengthen it so that the Pull-Pull cables do not cut into the wood. Position F4, F5, and F6 into the fuselage bottom slots, as shown in the following picture. Mountain Models Tantrum...
  • Page 31 Inserting the Servo Mounts and Attaching the Other Fuselage Side You need to insert the servo mounts into the fuselage. This needs to be done while the F3 bulkhead is still able to flex. Mountain Models Tantrum...
  • Page 32 You will need to reinforce the F3 bulkhead, using one piece from Figure G. • Bulkhead reinforcement (Figure G) Reinforcing the bulkhead • Position the top bulkhead reinforcement from Figure G on the back of bulkhead F3, matching the curves, and then glue it into place. Mountain Models Tantrum...
  • Page 33 Glue the bulkhead into place, and then finish gluing the rest of the fuselage sides and rear joints. Attaching the Bulkhead Stringer The bulkhead stringer goes from the F7 bulkhead back to the rear of the fuselage. • Stringer (Figure D) Mountain Models Tantrum...
  • Page 34 From the outside of the fuselage sides, slide the wing alignment brace through the fuselage body and into the slots just in front of bulkhead F3. Wing alignment brace in front of the F3 bulkhead Servo mounts Mountain Models Tantrum...
  • Page 35 We chose to use thick CA at the corners for its added strength. These spots are fairly stressed, so they need a bit more than average strength. Flow thin CA around all of the joints to make sure that everything is glued solidly together. Mountain Models Tantrum...
  • Page 36 F1. Motor mount supports inside the fuselage Make sure that they are centered and flush with the fuselage sides, and then glue into place. Assembling and Attaching the Motor Mount • 4 motor mount pieces (Figure L) Mountain Models Tantrum...
  • Page 37 Fuselage Top Sheeting (Figure J) Attaching the fuselage top sheeting Spray the entire piece with a 50/50 mixture of water and alcohol so that it’s more flexible and less prone to splitting while you are manipulating the piece into place Mountain Models Tantrum...
  • Page 38 The cowl piece is already attached and sanded here for reference and positioning purposes only, you should not have this attached to yours yet. Secure the piece into position using two rubber bands, one at each bulkhead. Mountain Models Tantrum...

  • Page 39: Step 6: Assembling The Landing Gear

    Once you've finished building the fuselage, you can begin assembling and attaching the landing gear. Necessary Pieces • 2 plywood landing gear reinforcements (Figure M) • 1 balsa landing gear mount (Figure E) • 1/16" x 13.5" landing gear wire (Thicker Wire) • 2 wheels (Bagged Parts) Mountain Models Tantrum...
  • Page 40 Once done, the balsa pieces and the landing gear wire should be encased within the plywood landing gear reinforcement pieces. Roughen up the bent ends of the landing gear wire, slide one of the aluminum tubes over each end, and then glue into place. Mountain Models Tantrum...
  • Page 41 200 grit sandpaper for sanding What to Sand This is a fairly small chore for the Tantrum, 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- rounded bits.
  • Page 42 Figure F, and then repeat for the second set. Cut two 1/2" x 1/4" pieces off of the 1-1/2" clear mushroom head Velcro piece. Remove the backing of the Velcro pieces, and stick them inside each canopy mount. Mountain Models Tantrum...
  • Page 43 Canopy mount in the fuselage side Covering the Tantrum 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 44 The wing alignment brace was put in place within the fuselage earlier in this process, now it's time to glue it in place. • Make sure that the alignment brace is centered, and then glue the joints. Mountain Models Tantrum...
  • Page 45 This will ensure that the control horns don’t touch each other. Position the servos onto the servo mounts so that they are straight, and then screw them into place using the screws that came with your servos. Mountain Models Tantrum...

  • Page 46: Step 9: Attaching The Control Horns

    Ailerons: Using the pieces shown above, insert one of the control horns so that its holes are facing where the wing will attach, into the same side that has the aileron servo mount. Repeat for the other aileron. Mountain Models Tantrum...
  • Page 47 Run a bead of thick CA along the top of the bulkhead stringer where the covering was removed, and position the vertical stabilizer, making sure that the rear of the stabilizer lines up with the rear of the fuselage and that it’s perpendicular to the elevator. Mountain Models Tantrum...
  • Page 48 You are going to route two of the cables out of the bottom oval cutout on the right side of the fuselage, one cable out of the smaller oval cutout at the top on the right side of the fuselage, and one cable out of the bottom Mountain Models Tantrum...

  • Page 49: Step 11: Installing The Aileron Servos

    Using the thin music wire, z-bend one end and insert it into the correct hole of the control horn. Correct Control Horn Hole Selection Hole closer to the control surface = more throw Hole further from the control surface = less throw Mountain Models Tantrum...

  • Page 50: Step 12: Installing The Motor

    The hole in the inner cowl should be at least 3/16" wide, so that the supplied motor retaining screw fit. Once you get through the cowl, stop with that drill bit and use a 1/16” drill bit to complete the hole through the gear box and the motor mounts. Mountain Models Tantrum...

  • Page 51: Step 13: Attaching The Wings

    Battery Mount and Front Battery Retainer (Figure L) Front Battery Retainer Battery Mount Attaching the wings Position the wings so that the servos are on the underside, and then slide the fuselage attachment pieces, through the wing slots on both sides of the fuselage. Mountain Models Tantrum...
  • Page 52 Insert the motor retaining screw into the hole, located on the battery mount. This is to make it so that the mount cannot move backward or forward from this position. Battery mount Motor and battery mount retaining screw Front battery retainer Mountain Models Tantrum...
  • Page 53 Attaching the Tailskid This is one of those highly overlooked, but extremely important pieces if you want your backend to remain in one piece. For the Tantrum we are not using a wheel, we are instead using a tailskid. You will need: •...
  • Page 54 The landing gear is pressure fitted into the bottom of the fuselage. Attaching the landing gear • Gently push the landing gear reinforcement piece up into the bottom of the F2 bulkhead slot. You may need to rock the gear slightly to get it into place. Once Mountain Models Tantrum...
  • Page 55 Setting the Throws You need to adjust your radio trim so that the elevator, rudder, and ailerons are all ° level. The throws are all the same for the Tantrum, with the low rates being 30 and the ° °...

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