Top Flite Q7900 INSTRUCTION BOOK
TANK ASSEMBLY
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1. Lightly sand the outside of the drop tank halves with 400-grit
sandpaper.This will help the primer and paint adhere to the surface.
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2. Draw a line around the perimeter of each tank half about 1/8"
larger than the tank.This will leave a 1/8" flange for gluing.
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3. Trim off the excess plastic with scissors or a hobby knife. Use
220-grit sandpaper to even up the edge of the flanges.
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4. Use 220 or 150-grit sandpaper to roughen the inside of the
flange where the two halves will be glued together.
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5.The supplied 0.046" dia x 3" steel wire supplied needs to be bent
by following these steps:
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A. Mar k the midpoint on the wire.
WARBIRD DROP TANK
INSTRUCTIONS
Thank you for purchasing the Top Flite 75 Gallon Drop Tank kit.
This tank will add a great deal of realism and presence to many
1/7th scale warbirds.The tank is lightweight and easy to assemble and finish. It is easy to make droppable on a warbird under
construction. If you are going to add it to a model that is already
built, it would be easier to make it removable manually, without
servo control.
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B. Using Sketch #1 as a template, bend the wire to create a "U"
shape as shown in the above image .The center section is 1/4" wide.
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C. Using Sketch #2 as a template, bend the legs in opposite
directions as shown in the above image .The center section has a
height of 1/4".
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6. Cut out the slot in the top half of the tank to allow the Release
Loop to protrude through the top of the tank from the inside.
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7. Use 150-grit sandpaper to thoroughly roughen the inside of
the tank where the release hook is secured.With the Release Loop
inserted through the top half of the tank, test fit the Release Loop
to the Release Mechanism to make sure there is no interference.
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8.Roughen the portion of the Release Loop that will be glued to the
tank with 150-grit sandpaper.
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9. Glue the Release Loop to the inside of the top half of the tank
with 30-minute epoxy and the supplied 1" x 3" fiberglass tape.Allow
the epoxy to cure.
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10. Check the fit of the top and bottom halves of the tank carefully. Sand away any obstructions so you have a good fit.
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11.You may wish to add about 1/4 oz of nose weight (not included) to the inside nose of the tank.This will make the tank more neutrally balanced when it falls. If you choose to add nose weight,
roughen the inside surface thoroughly and use epoxy to glue the
weight securely in place.A couple of old washers work well for this.
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12.Tape the two halves of the tank together in several places with
masking tape.Glue the two halves together b y wicking thin CA into the
seam. Do not use accelerator, as it will weaken the plastic.
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13. Even up the flange with coarse sandpaper. It should be about
3/32" wide when you are finished.
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14. Pr ime and paint the tank as desired.
TYPICAL INSTALLATION OF THE
RELEASE MECHANISM
Note:These are the latest instructions for the installation of this
drop tank. Please disregard any earlier instructions from any of
our plans or manuals.
]
Sketch #1
/4" [6.35mm
Sketch #2
1/4" [6.35mm]
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