Mountain Models Flashback Manual de usuario
Flashback Specifications
Wingspan: 36in. (91cm.)
Length: 36 in. (91cm.)
Wing Area: 265in2(1710cm2)
Weight (without battery): 12oz. (340g.)
Wing Loading (depending on battery): 8.5 – 10.0oz/ft2
Mountain Models Flashback
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Revision History
Date 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.
Sincerely,
Doug Binder
Mountain Models
6975 Blackhawk Place
Colorado Springs, CO 80919
www.mountainmodels.com
Phone: 719.592.1387
Fax: 719.528.6125
Created by Ross Design Group for exclusive use by Mountain Models.
Mountain Models Flashback 3
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.
What You Will Need
• Smooth and flat work surface
• Wax paper to protect the plans
• Thin and thick Cyanoacrylate (CA) glue
• Hobby knife with #11 blades
• Needle nose pliers
• Wire cutters
• Sanding block with 200 grit sandpaper
• 90°triangle or small square to true the bulkheads and fuselage
• Covering material (if not using the supplied Doculam)
• Sealing iron for applying the covering
• Clear tape for aileron hinges
• 4 channel radio
• 4 channel receiver
• GWS EPS400-C motor with a GWS HD 10x7 propeller
• 3 micro servos (we recommend either the Hitec HS55s or the GWS Picos)
• Electronic Speed Control (ESC) capable of handling at least 15 amps
• 8 cell 950 mAH KAN NiMH battery pack (minimum)
Parts List
The following tables list all of the pieces that are in your Flashback kit.
Description of Parts
Wood
Figure A: 1/16” laser cut balsa sheet
Figure B: 1/16” laser cut balsa sheet
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Description of Parts
Wood
Figure C: 1/16” laser cut balsa sheet
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
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Description of Parts
Wood
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
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Number
in Kit Description of Part
Loose Wood
2 1/8” x 18” hardwood dowels for leading edge
Wire
1 3/32” x 14” landing gear wire
1 1/32” x 18” thin music wire for the tail wheel and aileron pushrods
Plastic
1 Plastic canopy
1 Doculam clear covering material
Bagged Parts
1 1/8” round x 2.75” hardwood dowel
1 1/4" x 1/4" x 3/4" balsa stick with metal tack
4 Motor mount plywood pieces
2 1 3/4” wheels
2 Internal star wheel retainers
1 1/2” tail wheel
1 6” Velcro strip for mounting the battery and receiver
1 6” double-sided Velcro strip for battery strap
1 Neodymium canopy hold down magnet
1 Tyvek strip for the rudder and elevator hinges and tail wheel
reinforcement (also referred to as CA hinge material)
1 Spectra thread for pull-pull system
6 Micro pushrod connectors
4 Cotter pins for the pull-pull cables
2 #2 x 3/8” motor and battery mount retaining screw
General Building Tips
• Tape your plans to the work table, and then cover them with wax paper to
protect them.
• Balsa is a lightweight and fragile wood, so you do need to be careful with it;
however, you will also need to use a little bit of force to make everything fit
properly, so don’t be too timid.
• Join all of your pieces using thin CA (Cyanoacrylate) glue, unless we tell you
otherwise. In general, only a small amount of CA is necessary to glue parts
together.
• Don’t remove any pieces from the balsa sheets until they’re ready to be used.
That way, parts won’t get mixed up or disappear.
• After you remove pieces from the balsa sheets, carefully remove any of the extra
material from where the piece was attached.
• Don’t over force your pieces together. If they aren’t going together properly,
make sure you have the right pieces and that they are oriented correctly.
• 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.
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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.
Step 3: Assemble the wings.
Step 4: Assemble the stabilizers, rudder, and elevator.
Step 5: Assemble the ailerons.
Step 6: Assemble the landing gear.
Step 7: Assemble the canopy.
Step 8: Sand, cover all your pieces, and remove the covering where described.
Step 9: Install the tail feathers.
Step 10: Position the wing and ailerons.
Step 11: Install the elevator and rudder servos.
Step 12: Attach the control horns.
Step 13: Install the aileron servo.
Step 14: Install the motor.
Step 15: Attach the electronics.
Step 16: Finish the kit up with the tail wheel, batteries, landing gear, canopy, throws,
and center of gravity.
Final Step: On a calm day, find a field without too many trees or light poles and go fly.
Experienced builders may notice that this building order
goes against the normal building conventions. We have found that fewer pieces get
mangled this way, since you are building the stronger pieces first. For example, the tail
feathers are at the end of the build process instead of the beginning, so that they are
less likely to get underfoot or under cat (which seems to be a recurring problem) and
are being built right before they are attached to the fuselage and each other.
Step 1: Preparing Your Workspace for Assembly
Before you begin assembling the Flashback, you must prepare your workspace.
! Making space in what is probably the most crowded place in your home
1. Lay out the plans on a flat worktable, and then tape them down.
2. Cover the plans with a sheet of wax paper. This will protect the plans from glue.
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Step 2: Assembling the Fuselage
The first thing you are going to assemble is the fuselage of your airplane. This involves
assembling the fuselage sides and bottom, attaching the bulkheads, assembling and
attaching the motor mount, and finally, attaching the sheeting.
It is REALLY important that the fuselage sides are mirror images of each other;
otherwise you will have two left or two right sides, which may work for a profile
plane…
Assembling the Fuselage Sides
For the fuselage sides, you will need:
• 2 Fuselage Pieces (Figure A)
• 1 Fuselage Piece (Figure B)
• 1 Fuselage Piece (Figure C)
! Assembling the sides
1. Remove the fuselage pieces, shown in black, from the balsa sheets.
To remove the pieces, gently flex the balsa sheets until the pieces fall out.
You may find that you need to carefully trim the extra pieces of wood that
originally held the piece to the sheet.
2. Using the notches and grooves on each fuselage side, position them as shown in the
following picture.
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3. Making sure the joints are snug and flush, apply thin CA to each of the joints. 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.
Be careful to keep your fingers as far away from the glue as possible; otherwise,
you might become a part of the model permanently. If you do get stuck, remove
yourself as carefully as possible, trying to avoid taking any of the wood with you.
Once separated, remove the CA glue from your fingers using nail polish remover, or
acetone, making sure you wash your hands thoroughly when done.
4. Once the glue is dry, carefully remove them from the wax paper.
Attaching the Fuselage Reinforcement Pieces
The fuselage reinforcement pieces, or fuselage doublers, are used to reinforce the
fuselage and are placed on the interior walls of each fuselage side.
Yet again, I am just going to quickly mention that the fuselage sides must be mirror
images of each other. 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)
Notches and
grooves you use to
create the fuselage
sides
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• Fuselage Doubler (Figure C)
• Fuselage Doublers (Figure D)
• Fuselage Doublers (Figure E)
! Attaching the first set of fuselage doublers
1. Line up the first fuselage doubler (Figure B) with the larger oval slot and the wing
opening, located on the fuselage side.
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.
2. 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.
Fuselage doublers
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