Using a standard Cherokee, I ran simulations with both 18" and 16.4" tubes:

Short-body: E12-6, 2018', Dv 29 FPS, requires 0.375 oz of ballast at base of NC, has a margin of 1.43. 28" of rod.

Long-body: E12-6, 1987', Dv 25 FPS, requires 0.25 oz of ballast at base of NC, has a margin of 1.45. 29" of rod.

The E12 requires ballast on both versions. The margin was below 1.0 for both without it.

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Craig McGraw

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