Great Planes RV-4 Park Flyer Kit - GPMA0010 - Manual (Page 31)

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9. Use four #2 x 3/16" [4.8mm] screws to hold the cowl in
place, two on each side of the cowl cheek. Use a 1/16"
[1.6mm] drill bit to drill the screw holes into the F1.
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10. Mark the cowl cheeks and cowl to suit your trim
scheme. Remove them from the model and paint them as
desired. When you mount the parts back on the model, the
cowl cheeks can be glued into place with thin CA, being
careful not to glue the cowl.
The next two steps are very important for adequate cooling
of the motor.
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11. Trim the bottom of the cowl to allow cooling air to
enter the cooling holes in former F1. This is especially
important if you are using the Great Planes S-280 or S-370
motor. Without adequate cooling, these motors can easily
overheat, greatly reducing their life span.
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12. Cut an opening in the bottom of the fuselage for
heated air to escape. This hole should be at least 1-1/4" x 2"
[32 x 51mm].
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13. Cut the right wheel pant parts from their plastic
sheet, trimming them as close to the sheet as possible.
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14. Remove the right wheel from the model. Fit the
wheel pant parts together and trim an opening in the bottom
for the wheel. Trim the wheel pant sides so that the wheel
fits neatly inside, without being too tight or loose.
Use this photo for the next two steps.
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15. Glue the wheel pant sides together with thin CA. Cut
some thin strips from leftover plastic and use them inside the
wheel pant to reinforce the seams where the sides join. Fill the
seams with filler. Bondo
® automotive filler works well. Sand the
filler and then paint the wheel pant as desired.
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16. Drill a 3/32" [2.4mm] hole at the bottom of the
groove for the landing gear wire.
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17. Cut two 1/4" [6.4mm] pieces from a leftover 1/8" x
1/8" [32. x 3.2mm] balsa stick. Glue these pieces on each
side of the hole. These pieces will act as spacers to hold the
wheel pant away from the wheel. Depending on the size of
your wheel and how you cut the opening in the wheel pant,
you may need to glue a shim piece to these spacers. The
wheel should not rub against the side of the wheel pant.
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