Mountain Models ParkJet Build Manual
ParkJet Builder’s
Manual
Thank you for purchasing the ParkJet. The ParkJet is a profile ducted fan airplane that can be flown in a
larger park. The ParkJet was initially designed by Scott Stoops and modified for laser kitting by
Mountain Models.
March 19, 2003
Last revised April 13, 2003
Copyright 2003 Douglas Binder, Mountain Models
www.mountainmodels.com
(719) 592-1387
(719) 528-6125 fax
Specifications:
Wingspan: 33.75”
Wing Area: 200 sq. in.
Weight with 8x600AE batteries: 17 ounces
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Required Equipment
To build:
!
Xacto with #11 blades
!
Thin and Thick CA – Cyanoacrylate glue (Super Glue)
!
White Glue
!
Sanding block with 200 grit sandpaper
!
Smooth, flat work table
!
Wax paper to protect plans
!
Needle nose pliers
!
Wire cutters
!
Hobby Iron for applying covering – also called a sealing iron
To fly:
!
Three channel radio (The Berg5*dsp is highly recommended, second is the GWS-R4P micro
receiver. Two micro servos: Hitec HS50s, HS55s, or GWS Pico servos recommended
!
GWS EDF-75
!
Motor Speed Control: 15 amp rated
!
Battery pack: 8 cell 600AE or Kan 950.
Parts List
1 ea – 1/8” laser cut balsa sheet
2 ea – 3/32” laser cut balsa sheet
1 ea – 1/16” laser cut balsa rib sheet
2 ea – 1/64” laser cut plywood sheet
1 ea – 1/16” laser cut plywood sheet
1 ea – 1/8"round x 19” hard wood leading edge
1 ea – 1/8"round x 17” hard wood leading edge
2 ea – .032” music wire pushrods
1 ea – 8” plastic pushrod tube
1 ea – .200” x 14.5” carbon fiber tube
1 ea – .200” x 6” carbon fiber tube
1 ea – 6” Heat shrink tubing for pushrods
1 ea – Velcro strip for mounting the battery
1 ea – 1/8” x 1/2” long aluminum tube elevator bushing
2 ea – 3/32” x 2” music wire elevator attachment rods
2 ea – micro pushrod adjusters
1 ea – Roll of covering material
Notes and Hints
• The ParkJet has been designed with weight in mind. Parts and reinforcements were chosen so as
to keep the plane light. Special care must be taken when making glue joints to ensure that the
ParkJet can survive rough landings.
• There is very little that is critical when building the ParkJet. The only thing that requires special
attention is to make sure the wings are not twisted. If the wings are straight, the ParkJet should fly
hands-off without any trim.
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• Heat shrink can be heated with a soldering iron or, if you dare, with a lighter. Pay close attention
to what is near the heat shrink when you are heating it.
• You really need the sealing iron (Also called a hobby iron). You will find putting on the covering
so much easier. They are reasonably inexpensive and invaluable.
• The parts are held into the sheets by retaining gaps. When you break a part loose, you should
lightly sand the nubs left by the gaps down.
Assembling the Tail
1. Lay down some wax paper on a flat work area.
2. Remove the tail parts from the 3/32” balsa sheets.
3. Carefully holding the pieces together so that you don’t glue yourself to the model, flow some thin
CA into the joints.
4. Glue the 1/64” plywood doublers to the rudder and elevator halves using thin CA
5. Flow some thin CA into the elevator joiner rod openings to harden the elevator in that area.
6. Sand the tail surfaces smooth and round the edges.
7. Cover the tail surfaces with the supplied Doculam or a lightweight covering such as Solite. See
the wing covering section for covering tips.
Wing Assembly
Note: It is very easy to make two wings of one side, i.e., two right wings. This is a bad thing.
! Tape a sheet of wax paper over the plans to protect the plans and to prevent glue from sticking to
them.
! Remove the two vertical spars from the 1/16” balsa sheet. You will note that they fit together with
a V joint to form the center wing. Be very careful to make a left and a right wing. It doesn’t
matter which vertical spar forms the left or right side.
! Slide the ribs into the vertical spars. The largest rib goes next to the V. Do not glue yet.
! The four spar caps are identical except for the Vs in the center. Take special care to use two of the
same type (V pointing out) on the same side of the wing.
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