Specifications
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STEP 2: INSTALLING THE COWL
STEP 1: ALIGNING THE COWL
PRO TIP The Yak 54 ARF includes a clear mock-up cowl that can be used to make it easier to locate the necessary cutouts for
your engine and mufer prior to actually cutting the berglass cowl. This is great for locating and transferring the initial cutouts to the
berglass cowl; however, we suggest locating the holes for the cowl mounting screws using the method described in this section.
This method will be more accurate than using the mock-up cowl.
q Line up the front of the cowl, using the spinner backplate and the propeller
as a guide. When aligned properly, the cowl opening should be centred around
the spinner backplate and the front of the cowl should be 1/2" (13mm) behind
the back edge of the propeller. The painted lines on the cowl should line up
with the matching lines on the fuselage, too.
q Measure and mark the locations on the cowl that you must cut out to clear
your engine's cylinder head and mufer.
q Carefully cut out the cowl for your engine's cylinder head and mufer, then
cut out the front of the air-intake scoop on the bottom of the cowl. Work slowly,
removing small amounts of material at a time, and checking the t often.
q When satised with the alignment, use pieces of masking tape to hold the cowl securely to the fuselage.
q Draw a short line onto the fuselage that is perpendicular to the front of
the fuselage and lined up with the centre of the predrilled hole in each cowl
mounting block. Each of the ve lines should be approximately 1" (25mm) long
to ensure that each of the ve lines extend past where the back edge of the
cowl will be once it's installed.
q Extend each of the ve lines that you previously drew onto the fuselage
forward onto the cowl. Like with previous ve lines, draw these ve lines
approximately 1" (25mm) long.
q Draw a short line onto the fuselage that cross each of the ve lines that you
drew onto the fuselage previously, to mark the back edge of the cowl.
q Temporarily slide the cowl onto the fuselage, then install your spinner backplate and propeller.