Great-planes Extra 300S 1.20 ARF Patty Wagstaff - GPMA1305 User Manual download pdf (Page 18)

the three line system, you will need to route the carburetor

line to the carburetor fuel nipple and the vent and fill lines to

the front of the firewall. Glue a block of balsa to the firewall

and make a hole through it of the size of the vent tube. Slide

the vent tube through the balsa block. Plug the fill tube with

an Aluminum Plug. Make sure the fill tube is long enough so

that it can be pulled out of the cowl to fill the tank. If you use

the two tube system with the Easy Fueler Valve, the valve

needs to be installed between the carburetor and the tank in

the carburetor line.

Note: The cowl installation is similar for both the gas engine

and the glow engines option. This instruction book will

explain how to install the cowl with a glow engine installed

on the airplane. The only difference between the two

installations is the location of the holes for the carburetor

needle valves and clearance holes for the muffler tubes.

❏ 1. Find the five 5/8" x 5/8" x 7/8" [15mm x 15mm x 20mm]

hardwood blocks. Glue them on the firewall as in the

positions shown with 6-minute epoxy. Carefully sand them to

the contour of the fuselage. Use masking tape on the

MonoKote to protect it from being scratched while you are

sanding. Also sand away the fuelproofing on the firewall to

glue the blocks to the bare wood.

❏ 2. Find the remaining 1/8" x 10" [3mm x 254mm]

hardwood

dowel and cut it in 1" [25mm] lengths. Drill two 1/8" [3.2mm]

holes on each cowl block into the firewall. Glue the dowels

in the holes with epoxy. This will improve the blocks ability to

withstand engine vibrations.

❏ 3. Use long paper strips as shown to mark the location

of the hardwood blocks.Tape the paper strips to the

fuselage

so that they do not move during the following steps.

❏ 4. Place the cowl over the engine and push it back onto

the fuselage until the cowl ring is 1/8" [3.2mm] behind the

face of the prop washer. Install the spinner back plate and

the propeller nut. Center the cowl ring using the spinner

back plate as a reference. Tape the cowl in place.

Install the Cowl

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Great-planes Extra 300S 1.20 ARF Patty Wagstaff - GPMA1305 User Manual Page 18