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BUILDING THE STEALTH PLATTER 1/2 A TRAINER
Designed by Heman Lee
Engine: Cox Black Window .049 or Norvel Bigmig Startup .049

You may use these plans freely for non-profit use only!

Parts List

1Foam Board 3/16"1Lead-out Guide
2Plywood 1/16 X 1 1/4 X 1214-40 X 1/2" screw, #6 Washer and blind nut
1Balsa Sheet 1/8" X 3"  X  36"7Screws 2-56 x 3/4 and washers
1.055 (1/16") music wire, .078 (5/64") music wire and 3 Plastic Wheels9Nuts 2-56
1T-Angle Motor Mount1Control Horn
1Lead Weight 1/4 oz1Bell-crank & Spacer
1.055 X 9" Pushrod Wire 1Cox Black Widow with Cox 6 X 3 prop.

Tools Needed

  1. Titebond Wood Glue or Epoxy.
  2. Model airplane dope (clear and black).
  3. Xacto Hobby Knife or Razor Knife.
  4. Sand Paper - 150, 220, 400.
  5. Ruler and 60/30 Triangle.
  6. Pliers with wire cutter.
  7. C-Clamps and some heavy weights (Brick or frying pan).
  8. Electric or Cordless Drill.
  9. Black paint.

Updates:

How to Outline the Stealth Platter

 

Tail Fins

Building Instructions

Step 1. - Cut Parts
Cut the foamboard and all balsa parts according to the outline directions. Cutting 2 plywood doubles 1/16 X 1 1/4 X 12" in length.  Cut the tail fins and elevator part from the 1/8" sheet of balsa.
Step 2. Fill Foam Edges
Use the flat edge of a scissors to crimp the edge of the foam to create a slight taper airfoil.   Fill all of the edge of the foam with Titebond glue.  This will seal the foam from being exposed when painting. 
Step 3. - Elevator
Epoxy a connecting rod using 1/16" steel wire, so both elevators move as one piece.  The center elevator will remain stationary.  Use scrap of nylon or fiberglass tape and epoxy to reinforce the connection.
 Step 4 Center Section
The center triangle section does not move!

Bevel the center triangular elevator so the connecting wire is not in the way of the movement. 

 

 

Step 5 Elevator Assembly
Assembly the elevator as shown.  Do not hinge or glue anything at this point.  
Step 6 - Doublers

Glue the plywood doublers to the top and bottom. Make sure the doublers are exactly in the center on both side.   Use a clamp or heavy object to clamp down the doublers and let it dry over night.  

NOTE: The elevator connecting rod is sandwich between the top and bottom plywood doublers.

 

Step 7 Hinge the Elevator
Use the FastCal tape hinge or Scotch Crystal Clear Packing Tape, to join the elevator to the main body. Un-like the Platter, only apply the hinge to the top side.  
Make sure that both elevators moves from neutral to the up position simultaneously. The center triangle section does not move.  The Stealth Platter does not require any down elevation.  Neutral flight for this airplane will be slightly up.

Step 8 - The Tail
Installing the Stealth Fins at a 60 degree angle.

 

Step 9 - Lead-Out Guide


You can use strip of scrap plastic or 1/16" plywood.  Make a slot into the foam board and glue it into the slot.

 

On any new or untested designed model, it is a good idea to make the guide adjust adjustable.  You can do this easily by drilling addition holes.  If the airplane come in at you while you are flying, you can move the lead-out a little farther back.

 

 

Step 10 - Paint the Platter
You can used any fuel proof paint although model airplane dope is the best. If you can not get dope, use Rustoleum brand paint will give you enough fuel proofing. Epoxy paint is very fuel proof but don't apply too heavy a coat. You should not use more that 2 coat on this model. One good coat should do it. If you want a smoother job on the rudder section, apply a few coat of clear dope and sand it smooth before spray the final color coat. 

Step 11. - Control Horn & Pushrod
Install all hardware. Drill holes for the control horn first. Bolt on control horn with 1 washer on the bottom. 

Make the Pushrod from 1/16"  piece of steel music wire.  Make a Z or J-bend and one end.  Make an adjustment Z-bend in the middle. Install the Control Horn and attach the pushrod to it.  Make a bend 90 degree up and attach it  to the bell-crank.   Position the bell-crank in a neutral position. 

Adjust the bell-crank, so the neutral position is slightly up.  This is because the Stealth Platter does not actually have a true air-foil and require a positive incidence to fly level. 

Step 12 - Bell-crank Assembly

Drill the hole for the bell-crank and install it according to the instructions diagram. 

Install lead-out assembly.  Make lead-out wires from scrap .015 or .018 cable or music wire.
 

 

Step 13 - Leadout Wire

Here is an alternate method of making the leadouts from a solid steel wire rather than using the crimp and sleeve method for stranded steel cable.

You can make a leadout wire from .025 music wire.  Do the same on the bellcrank end and connector end.

 

 

Step 14 - Landing Gears

Make the gear with high quality steel music wire.  Install landing gear assembly and wheels.  Install the rear landing gear 8" back from the nose.  Use the 440 X 1/2" bolt and number 6 washer to fasten the gear in place.

Notice that the washer is bend in a concave shape.  This will help to secure the gear better.

15 - Nose Gear
Do not make the lower bend for the wheel yet.  This will allow you to install the nose gear from the top.

The nose gear is made with heavier gauge or wire.  Use 5/64" or 3/32 music wire.

Step 16. - Install Engine Mount
 If you can not find the aluminum T-bar for the engine mount, use 2 L-bar on each side or construct a wood mount using 1/8" plywood for the firewall.  Plans for this mount is on the Platter Plans. 

Install 1/2 oz of weight offset on the outboard wing tip. If the outboard wing is too high or model come in during flight, you may need to add more weight.  

Install the engine mount and do not over tighten the screws on the mount.  It's only foam-board, and over tightening can make the mount more fragile.

17 - Your Finished

You Stealth Platter should now look like this, right?


click on picture for more detail

Step 18 - Flying


The Stealth Platter can be flown on 30' to 35' dacron string lines.  Set the control neutral with the elevator slightly up.  You may have to adjust this to determine the actual neutral position.   This airplane was designed so that a beginner can fly it off the ground.  I recommend a Cox 6 X 3 propeller.  Adjust the landing gears, so that the airplane is banked slightly to the right with the right wing down and away from the circle.  This will prevent the airplane from come in. 

Step 19 - Flight Trimming

When the airplane is in the air, watch to see if the inboard or outboard wing is dipped.  It may become necessary to adjust the tip weight so the airplane flies level.  If the airplane flies with the inboard wing down, one method is to cut down the  outboard elevator or twist them the opposite way giving the outboard more up elevator.

Have fun flying!