Robert,


It is not the weight that matters. It is the tangential inertia of the prop, that affects the amount of work the engine must do, in order to increase, or to decrease the speed at which is spins.

Spool-up is what the spools in turbine engine do - not props.
Let's not make a 3-D pilot with a .46 feel like he has a real turbine

That 15x6 Xoar prop, at only 52 grams, may have more inertia than the 76 gram 14x6 APC, just because it has a larger diameter. The weight to be accelerated is further from the shaft.

Increasing the spinning speed of a shaft weighing 76 grams takes but an instant, because its weight is close to the center and the linear change in its tangential speed is relatively small as a result.

An annulus with the same weight, with spokes connecting it to the shaft, will require much more work to reach the same RPM, since its tangential speed must be made much greater.


This is the main reason only a few are using props 16" and greater in diameter, which are made of heavy GFN.
Most use wood and props made of carbon fibre are middle-weight...