Username Protected wrote:
So does this show that winglets are a hoax and the real performance increase comes from the small wing span extensions that seem to be part of every winglet add on STC.
Let's see a add on winglet kit with NO span extension for a performance comparison.
I think that is proven to be true with the 421 vs 414 winglet STC. The 421 gains 3'-ish wingspan, with a significant performance difference, the 414 gains no wingspan and marginal performance difference.
