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Bob, here is what my simulated models without support mast or feed lines show for the GM, Imax with GPK, and a Imax without a GPK, all set at 19' feet.

[ATTACH]5504[/ATTACH]

Do you think the GPK hanging low might have a bearing on your buddies poor results at a low install height for the Imax with GPK?

I also notice in this comparison that the Imax with GPK shows a 1* degree increase in angle vs. the other two. I increased the height by 2' foot increments for the Imax with GPK and it never showed to make a better pattern than the plane Imax. The difference was somewhat remarkable too. That surprised me a little.

Do the guys over there tend to give higher marks for the Imax with a GPK in other installs that are up higher?

[QUOTE="Marconi, post: 310580, member: 903"] Bob, here is what my simulated models without support mast or feed lines show for the GM, Imax with GPK, and a Imax without a GPK, all set at 19' feet. [ATTACH]5504.vB[/ATTACH] Do you think the GPK hanging low might have a bearing on your buddies poor results at a low install height for the Imax with GPK? I also notice in this comparison that the Imax with GPK shows a 1* degree increase in angle vs. the other two. I increased the height by 2' foot increments for the Imax with GPK and it never showed to make a better pattern than the plane Imax. The difference was somewhat remarkable too. That surprised me a little. Do the guys over there tend to give higher marks for the Imax with a GPK in other installs that are up higher? [/QUOTE]

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