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A. Position Cutter Drill Template on propeller face with cutter blade behind
the leading edge of the propeller blade. (see 1)
B. Note: All rotating cutters must be equal distance from center! Use template
centering arm to locate cutter from shaft to upper edge of prop face, then lock screws on
centering arm slide. Use marking pencil or scribe to draw outline of template on propeller
face. (see 1)
Repeat above procedure for opposite propeller blade. Do not alter centering arm once
positioned in place. Move template 180° from first layout for four-blade propellers,
(144° for five blade propellers). (see 3 & 4) |
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C. Holding template in place, drill through bottom center hole first, using
3/8" spotting drill (provided) approximately 1/8" deep. Then use "P"
size drill to complete hole 1" deep. Then tap with 3/8" x 16 tap approximately
3/4" deep. (see 2 & 3)
Use 3/8" x 1 3/4" SHCS in bottom hole. Mount template. Now repeat procedure for
drilling & tapping the other four holes. Remove template and repeat procedures on
opposite rotating blade location with template. (see 3) |
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D. Before mounting the rotary cutter blades, qualify two or more surfaces under
the cutter mount location: these surfaces MUST be within the same axial plane within .005
in. (see 4)
E. IMPORTANT: The cutter mounting holes must be drilled, but do not mount rotary cutter
blades onto propeller until propeller is on the shaft and in place. (see 5) |
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F. With propellers completely mounted, rotate propeller until one set of
drilled holes are 45° degrees from top center on "up" (preferred), or
"down" side. (see 3 & 5) |
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G. Mount rotary cutter blades to prop face ("Leader" rotary cutter
blade on top, "Follower" on opposite side). (see 5)
NOTE: The rotary cutter blades are each marked as "LEADER" or
"FOLLOWER" ROTARY BLADE. The "LEADER" has a groove which is .015
smaller than the "FOLLOWER" blade. This groove spacing allows for possible axial
misalignment of prop face. |
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H. Marry the stationary cutter assembly to the mounted rotary
cutter ("Leader"). There are two 3/8" x 1 3/4" shoulder screws and
nuts for this purpose. (NOTE: two shims must be between rotary and stationary blades when
marrying the two assemblies). (see 6) |
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I. Using plastic transfer paper, or measuring tape, mark from top center line
on propeller to upper edge of cutter box. Transfer this measurement to rope guard. Then,
using marking pencil, and Spurs' thin aluminum cutout template (provided), transfer cutout
onto upper section of rope guard. The rope guard cutout should clear the stationary cutter
box by approximately .125" - .025" on all three sides. (see 6, 7 & 8)
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Ia. The Stationary Cutter assembly Rope Guard cut-out should be located at
approximately 10:30 looking forward on a right-hand turning propeller and 2:30 on a
left-hand turning propeller. Only ONE Rope Guard cut-out for each propeller!
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Continue Installation Instructions
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