Originally posted by sigrun
Quite the opposite.
You're confusing the effect on flight characteristics of reduced weight/wing loading with an aft displacement of the CofG from reference datum.
Displacing the CofG aft, (tail 'heavy') will cause a model to be less stable and more sensitive to control input requiring greater anticipation and trim managment with ea throttle change by the pilot. In lay terms, to the operator this makes things seem to happen 'faster' through time relativity. ie: tasks vs time available 'compression' effect.
On the other hand, diminishing weight with fuel burn-off reduces wing loading irrespective of CofG location, and that is what allows a model to be approached safely at a physically lower speed. This is independent of CofG location. Provided the pilot takes advantage of this by setting up a lower speed approach, this is what makes things happen 'slower', both physically, eg: S=D/T, and relatively.
Whilst ideal target approach speed and attitude is a function of angle of attack and wing loading, not CofG location, more frequently actual approach speed is a function of R/C pilot klutz factor.
That may be true if you take High Energy Plasma Physics into account, but if you've got a nose heavy model on finals, you had better prepare for the fact that it's gonna come in nose down, and therefore quicker than you expected.
It's not gonna be a floater no matter how close Mars is.
-David C.