RE: RE: basic aerodynamics
I fly a lot of models - and some are extreme in their power to weight and wingloading
So to explain to those who don't fly models and /or lots of different stuff- or who are new to all of this:
Here is my silly postulate
"if the plane is light enough -CG does not matter
If it is too heavy -it still does not matter."
Why would I say that?
Imagine a fixed wing aircraft that is so light that it is almost bouyant.
Add an engine -
It is still a fixed wing powered craft.
Power applied and control surface applications will do all of the controlling.
The CG is of little or no importance.
Stall is not going to happen.
Ludicrous craft?
perhaps
Now make the craft too heavy - If it is too heavy to fly , the cg is again, of no value.
Silly?
maybe to you -You fly it.
What I see - over and over is some poor newcomer who has a plane that is too heavy to perform and when asking why, he gets all kinds of theories and rules and worse yet - formulas presented to show why the model does not perform as expected.
The real problem typically -It is just too durn heavy.and or underpowered
the CG can be moved to place the crash site further down the road - but tell it like it is .
All of the model flying I have done shows that "the critical nature of the the CG increases with wing loading."
Be honest - the same thing is true with a 1940 DC3
On racers - we always kept it forward- to prevent easily increasing the AOA past safe limits
On aerobatic stuff -such as designs we did for pattern, or for the TOC ( and they were good enough to place and win ) to little foamies which are grossly powered feathers --I find that weight and power are far more relevant than CG
CG is of course important but first the weight and power must be addressed.
Then place CG parameters for that situation.