Hi Rich, being a recognised FAI class the flying portion is exactly the same as for F4C.
The static scoring is simplified as the models aren't necessarily entirely built by the competitors.
The whole F4 rules, including F4H, can be viewed here, these are the current versions:
https://a008aa7b-b971-4544-b7b2-a1193a1d8014.filesusr.com/ug d/abee83_c6c14443530b4edfb605dd28955c40e3.pdf
I've no idea what the current AMA rules are, you can compare the pair.
__________________ Current Project Aermacchi MB 339.
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