[coderenegade]

It is, it falls out of the physics of VTOL vs. fixed wing flight. It's so extreme that cargo helicopters have to fly forwards to take off at MTOW, because it dramatically lowers the power required to get the aircraft off the ground relative to taking off vertically. You can minimise the impact in the mission requirements, but there's a reason hover and VTOL are typically specialist requirements. They tend to be very costly in terms of endurance.

[tonyarkles]

To put some numbers on this, down in the large quadcopter/fixed-wing size of aircraft, you can expect about 200W/kg of power required for the quadrotor/VTOL phase and more like 20W/kg once you’re in fixed-wing mode, assuming you have wings and speeds that provide a reasonable L/D ratio. Literally a factor of 10 (or more, if your fixed-wing design is more like a glider.)