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First of all;
Does anyone have any tips on preventing a pitchpole in heavy winds when sailing downwind, I recently experienced this most unfortunate event and was taken back by how easily the boat seemed to flip?


Bear off in the puff, if you are almost dead downwind and still on the edge of controll over trim the main to reduce projected area.

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Also;
I have old style jib cars with a micro fiddle block leading to an upside-down cam cleat, and it is nearly impossible for both my crewmate and I to uncleat the jib from anywhere on the boat besides climbing across the tramp to let out the jib. I was advised by a dealer to replace the cars with the new style with the eyelet and cam attached, but is there anyway to fix this problem?


The newer gear works great.

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Thirdly;
Performance-wise, is there a difference in the type of mainsheet block system used on the H16? When I bought the boat, it came with a 4:1 set probably for a H14, is it recommended to ugrade to a 6:1 or even 8:1, if so, where should i buy from?


Go with 6:1 it works and you will have more fun with the boat.

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Lastly;
Would anyone recommend installing a boom vang on the H16? On my boom, about 2 ft from the mast, there is a steel chainplate which looks like it could be used for a vang system, although I have never seen an H16 with a vang, would it be useful to put one in, and is it class-legal?


It is class legal but don't bother. Your crew will thank you.