Unless I've the wrong end of the stick, you have misapprehended Vtoss. It's the IAS to be achieved by 50' to conform to the take-off performance charts while providing an adequate margin above Vmc, not to provide asymmetric performance.
There is no requirement for the PA30/39 to be able to climb away between Vr & Vyse although once cleaned up, feathered etc it would be reasonable to expect to see some amount of climb performance if speed has accelerated towards Vxse. Can't remember if a Twin Comanche's stalls below 61kts though. If it's below then there's no requirement for positive climb performance no matter what you do. The best that its certification offers you is that its climb performance "...be determined." I'd bet a pound to a penny that unless you've reached at least Vxse with the wheels & flap up and prop feathered then downhill is the most likely outcome.
All at MTOW, of course. Given particularly favourable WAT conditions then it may well limp skywards. *Accelerating* to Vxse or Vyse would be problematic though.
Last edited by Tinstaafl; 28th July 2008 at 15:36.