Mountain Models Magpie Manual de usuario

Magpie

Foam Trainer

Magpie Specifications

Length: 34in.

Wingspan (SF): 46in. Wing Area (SF): 414in2

Wingspan (SP): 40in. Wing Area (SP): 360in2

Weight (without battery): 12oz.

Thank you for purchasing the Magpie. The SF or Slow Fly model is an elevator/rudder setup,

designed for the beginner pilot who wants a robust trainer. The SP or Sport model also has

ailerons for the pilot who wants to step up to the next level of flying. The wings are

interchangeable. Built properly, the Magpie should survive the majority of crashes you are likely

to experience learning to fly.

Sincerely, Mountain Models

DougBinder

[email protected] P.O. Box 9557

Colorado Springs, CO 80932

www.mountainmodels.com

Phone: 719.630.3186

Last updated Dec 19, 2004

Mountain Models Magpie

Before You Begin

Before you begin building your Magpie, make sure you read and understand all of the

instructions thoroughly.

Additionally, you will need to have the following items.

What You Will Need

•Smooth and flat work surface

•Wax paper to protect the plans

•Thin Cyanoacrylate (CA) glue

•Foam Safe Glue – 5 minute epoxy, white glue, or foam safe medium CA. We

recommend a tube of 5 minute epoxy.

•Hobby knife with #11 blades

•Needle nose pliers

•Wire cutters

•Sanding block with 200 grit sandpaper

•2" packing tape or wing tape for covering the wings and fuselage

•3M77 spray adhesive

•3 channel radio/4 channel for SP wing.

•GWS EPS350C-C motor

•2 micro servos (3 for the SP)(we recommend either the Hitec HS55s, GWS Pico,

Naro)

•Electronic Speed Control (ESC) capable of handling at least 10 amps

•KAN650 battery pack or 1000mAH or higher 2S LiPoly battery

Parts List

Quantity Description of Part

Wood

1 1/32” Laser cut plywood sheet

4 1/16” Laser cut plywood sheet

Foam

2 Wing sections

2 Fuselage sections

5 Depron tail surfaces

Additional Parts

1 1/8” round x 7 3/16” hardwood dowel

2 1/8” round x 2.5” hardwood dowel

2 6” heat shrink tubing

1 6” Velcro strip for mounting the battery

1 150” Plastic strapping

2 1/32” x 18” thin music wire for the pushrods

1 3/32” x 18” landing gear wire

2 Wheels

2 Wheel retainers

1 #2 x 3/8” motor retaining screw

Mountain Models Magpie 3

Quantity Description of Part

Additional Parts for the SP wing

1 1/32” x 18” music wire

1 6” heat shrink tubing

1 88” Plastic strapping

1 1/16” plywood control horns sheet

1 1/32” plywood control horn reinforcement sheet

2 Depron ailerons

General Building Tips

•Use only foam safe glue to attach the foam sections. Regular CA will dissolve the

foam.

•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.

Assembly Instructions

Step 1: Assemble the Wing

The first thing you are going to assemble is the wing of your airplane. This involves

assembling the wing halves, attaching the spar strips, and then applying the packing tape.

Both the SF and SP wing build the same. The SP wing has less dihedral than the SF wing

and has ailerons. The ailerons will be covered later.

Do not let non-foam safe CA touch the foam. Regular CA will dissolve the foam.

1. Glue the wing halves together with 5 minute epoxy. You can hold them together

with tape while the glue sets. Be sure that the two halves line up correctly. Do not

worry about the dihedral angle. The wings are cut with the proper angle at the

factory.

Mountain Models Magpie

2. Install the spar. Measure and cut two lengths of 1/2" plastic strapping so that they

are the length of the wing. Sand the strapping to help the glue adhere. This is

very important. Lay a strip down on a sheet of wax paper and apply epoxy to the

strapping, ensuring that there is an even layer of epoxy with no dry areas. Lay the

strapping in the notch on the wing and apply a length of wing tape or packing tape

over the strapping to hold it in place. Install the second spar in the same manner.

Give the epoxy a chance to set up before moving on to the next step.

3. If you prefer, you may shape the wingtips. I like to cut a radius into the front of the

wingtip to give the wing a more sweeping look. This is also a good idea if you expect

to be crashing as it makes the wingtip stronger. Cut the radius with an xacto then

sand the cut even and rounded.

4. Glue the .75”x2”x1/64th plywood reinforcement plates to the center of the wing at

the leading edge and the trailing edge. These are to protect the wing from the rubber

bands.

Installing the servo plate (SP wing only)

Mount the aileron servo reinforcement plates so that they are centered on the wing joint and

the front plate is directly behind the strapping plastic. Separate the plates enough so that

your servo will fit between them with about 1/16” extra gap. Glue the plates with epoxy.

You may want to hold the plates in place while the glue sets.

Mountain Models Magpie 5

Covering the Wing

Next, you are going to cover the Magpie wing using either colored wing tape, or clear

packing tape. You can use additional colored tapes to give your wing detail.

Choosing a Pattern

Make sure you choose a high contrast pattern using at least two colors, with the darker

color on the bottom and the lighter color on top. This will help you differentiate up from

down and left from right. Try drawing your pattern out on paper before attempting it on

your wing.

Applying the Covering Tape

For the Magpie, we recommend using wing tape (a colored tape) which can be purchased

from Mountain Models or clear packing tape which can be purchased at many office supply

stores.

1. Lightly sand the entire wing. Remove all the dust or the tape will not adhere.

The adhesive spray is known to contain acetone which will eat foam. In order to

minimize the problems, you must have a clean nozzle emitting a fine mist, which is

kept a good distance away from the wing and moved quickly. Apply a very light

coating on the surfaces, allow some dry time, and then apply another light

coating, letting it evaporate a bit before bonding. The slight eating of the foam

ends up being part of the bond.

2. Spray the wing with 3M 77 and let it set for about 5 - 15 minutes, until it is tacky.

3. Reinforce the center of the wing where it will be held on with rubber bands. Do this by

laying down 4 strips of tape, 4” long on the top of the trailing edge of the wing,

overlapping the bottom of the wing by ½”. Do the same for the leading edge.

Mountain Models Magpie

4. Starting from the trailing edge, run a strip of tape across the length of one wing,

overlapping the center by one inch. The first strip should wrap around the trailing edge by

1/2". Continue laying down strips of tape to cover the bottom of your wings, overlapping

each piece by 1/4" or more. The tape should also extend past the wingtip where you will

wrap the tape around the tip before trimming.

Keeping your scissors or hobby knife clean is very important to the covering

Mountain Models Magpie 7

process. After every five to ten cuts, wipe your blade with a Windex dampened

paper towel. The residue from the tape can make clean cuts almost impossible

since the tape will stick to the blades and just rip instead of cut.

5. Repeat Step 3 for the rest of your wing.

You can use permanent markers to decorate your covering if you don't want to add

weight or covering complexity.

Smoothing out the Covering Tape (Optional)

Using a heat gun or hair dryer, you can carefully shrink the tape until you get a glassy

finish. This is not a required step, but will make the surface look more polished. Be very

careful as the tape can shrink enough to pull away from the adjoining tape. It is also very

easy to melt the foam. Start with the gun on a low setting and increase the heat till the

tape just starts to shrink. Too much heat is a bad thing.

1. Start shrinking the bottom of the wings first, beginning at the leading edge and moving

towards the trailing edge. Do the middle areas last.

2. Follow the heat gun's path using a covered hand (you can use a thick, clean sock or a

towel), pressing down firmly, smoothing the surface and allowing the tape to adhere to

the adhesive.

3. Once the bottom is done, shrink the top in the same fashion.

Step 2: Assemble the Fuselage

You will assemble the fuselage by first gluing the two fuselage halves together, adding

strapping plastic for reinforcement, sanding to shape, adding servo mounting plates, then

taping the fuselage. Follow along carefully as there are a few critical steps along the way.

1. Glue the two fuselage halves together. You can use epoxy, white glue, or foam safe CA.

Hold the fuselage halves together with tape till the glue sets. Take great care to keep the

fuselage straight.

2. The rear of the fuselage is tapered, making it difficult to apply the strapping plastic in the

next step as the fuselage will bend when you press down on the strapping plastic. If you

shim the back with the wedges that were cut from the rear fuselage, it will be much easier

to keep the fuselage straight.

3. Glue the two fuselage reinforcement straps into place. Measure and cut the 1/2" plastic

strapping so that it fits from the motor cutout to the tail. The strapping will be positioned

1.5” up from the bottom of the fuselage at the front of the fuselage, and 1.25” up from

the bottom of the fuselage at the rear of the fuselage. Glue as you did the wing spar and

hold the strapping down with wing tape or packing tape. Don’t forget to sand the

strapping plastic before you glue it. The tape can be removed when the epoxy is set.

Mountain Models Magpie

NOTE: This is your last chance to make sure your fuselage is straight. Sight along the top

of the fuselage from front to back and check for any curving. The strapping can correct a

curved fuselage but, if you are not careful, can make the fuselage curve.

4. Sand the fuselage to round the edges as shown in the photo below. Start with 220 grit

sandpaper and round the top and bottom. You will find it easer if you only sand in one

direction. I like to completely round the top and bottom but just a little is fine. You'll want

to sand outside as the foam dust will make quite a mess. Remove as much of the foam

dust as possible before continuing. DO NOT SAND THE WING SADDLE (The area

where the wing meets the fuselage).

5. Mount the rear servo reinforcement plates so that the elevator servo plates are 1/4" in

front of the horizontal stabilizer and the bottom of the plates are just above the plastic

strap. The rudder servo plates are just below the plastic strap. Separate the plates

enough so that your servos will fit between them with about 1/16” extra gap. Glue the

plates with an even layer of epoxy.

Mountain Models Magpie 9

6. Glue the two 1/16” plywood wing mounts to the fuselage. The wing mounts fit on either

side of the wing saddle and are raised up about 1/8”. They have an engraved line on

them to help align them to the fuselage. Ensure that the wing mounts are aligned with

each other or the wing will be crooked. You can use a straight edge to check for level.

Glue with epoxy.

7. Lightly spray the entire fuselage with 3M77 and completely tape the fuselage with wing

tape. I find it easiest to start with the bottom. To wrap the tape around compound

curves, you can make small slits in the tape along the curve and perpendicular to the

curve. Make sure to wrap completely around the rear of the fuselage. When you are done

taping, you will need to go back and cut the tape away from the horizontal stabilizer slot,

the motor mount slot, and the left side of the receiver hole (the opening under the wing

saddle.

8. Put a fresh blade in your xacto and cut out holes in your fuselage for your servos. You

will use the servo plates as a guide and cut the width of the slots 1/16" narrower than the

width of your servos. This will give the servos a nice tight fit. I like to not cut completely

through the fuselage and just work the foam out with a screwdriver. This is just for

looks.

Mountain Models Magpie

!Building and attaching the motor mount

There are two types of motor mounts provided: a GWS stick type mount and a

firewall type mount. If you use the GWS EPS motor, you will use the stick

mount. We will only describe the stick type mount as the firewall mount is quite

similar.

1. Glue the motor mount together with thin CA. Be sure that the glue is

completely dry before sliding the mount into the fuselage as the uncured CA

will dissolve the foam.

2. Ensure that a GWS type motor/gearbox will slide over the mount stick. You

may need to sand the motor stick a bit to get the motor on.

3. Slide the motor mount into the fuselage and tape it into place. One piece of

wing tape per side will hold the mount in nicely. In the photo, the mount is

not taped yet. You can angle the mount to the right before taping to give

the motor some right thrust. About 3 degrees should be right.

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