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I believe the GW limit is dictated by the original gear drop tests. There are a variey of things you can do to the PushPull (for you Bahamain's) that will increase the load carrying capacity, however if the gear can't take the hit on landing, you can't increase the gross weight. There is a formula that the FAA uses that allows a plane to have a higher takeoff weight than landing weight (something like +5%) that can not be exceeded, without drop testing (and smashing) aricraft gear at a higher gross weight with mods.
For example my H has a takeoff weight of: 4630 and a landing weight of: 4400. The difference is: 4.967% of takeoff weight.
So even though my micro VG's could very easily add 200+ Lbs to my GW capacity, the FAA will not allow the increase due to the gear limitation.
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