Appendix A – Photocell Taping
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13841 Rev A
252
This section shows how to use each of the three tape-width
determination methods given in this appendix to solve the
following sample problem:
The user has placed the tape at 5 in. from the center of
propeller rotation and is doing a propeller balance operation
at 2400 RPM.
Using the Formula
Calculate with the formula, as follows:
Minimum tape width = 2.0 x 3.1416 x 5.0 x (2400/60) x
0.0003 = 0.377 in.
Using the Table
On the table, look up values that are less than 10 in. and between
2300 and 3100 RPM; therefore the user may employ one of the
following sets of tape:
One strip of No. 12803
Two strips of No. 10444
Five strips of No. 3300
Using the Graph
Find the tape values on the graph, as follows:
1. Find the rotational rate along the bottom of the graph that is
the closest to 2400 but larger, that is, 2646.
2. Follow the grid line upward to the 5-in. cross-grid. This point
falls somewhere between the 0.317 curve and the 0.475
curve.
3. Select the larger curve value for the tape width, that is, 0.475
in.
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