Thanks Shawn, sort of but not quite. I realise they are both refering to the first segment climb, but wonder why the regulations allow the option of raising the gear when in fact they expect it to be down still during this phase. The Eurocopter 155 continued take off elects to leave it down until the second segment has been established which is in line with 29.67, but 29.57 would infer you could raise it at Vtoss during the first segment if you wished.
I agree the drag may be minimal (except perhaps on the S-76) but am not sure I agree about best angle of climb. My understanding of types with variable Vtoss (that I am familiar with: 155 and 76) is that it is a function of speed at TDP and the subsequent field length available. ie short field means low TDP which by inference will require a lower Vtoss. This then tends leads to a reduced weight (unless a climb takes place while AEO that allows a drop down when OEI thus giving a larger spread between V at TDP and the subsequent Voss). As the Vtoss increases towards Vy then the second segment tend to become more limiting.
Either way, bring back Group A requirements; much more in hand for the wife and kids!