Hi, this is my first post on this news group, my interest is mainly model
gliders at this stage, but only for financial reasons. I am 18 and education
currently occupys my life.

I was of the understanding that as wing loading increases, best L/D is not
only at a faster speed, but is better then max L/D on an un-balasted glider.
For instance, if you have a glider which has its best glide ratio at 20km/h
(nice and slow) and is aprox 20/1 (nice and crap) - if you add 20kg ballast,
its best glide ratio is acheived at 30km/h and is 30/1
Correct me if I am wrong, it is more then possible.

In relation to the question, I dont beleive it has much impact.
There are positives and negatives in each case, Personaly I would think at
the same speed, the pullup of a lighter glider would be higher, but at peak
glide ratio speeds a balasted glider would gain more height.
I try to rationalize this by scaling up the flight patern in direct relation
to the flight speed,
If you normaly fly with 20m diameter circles, if you double your speed you
will also double your circle diameter.
If you double your speed you double your height?

Personaly I would like to see the question defined more accuratly.

Regards
Vince

"Scott Correa" wrote in message
...
Shouting is unbecoming a gentleman..................

Somehow I don't think you understood what I said.
Every test I have seen published shows the max L/D
point moving to the right (ie occuring at a higher speed)
with an increase in wing loading. The sink rate curves
do the same thing. So again I ask, doesn't the heavier
airplane bleed energy more slowly..................

This has nothing to do with starting the engine......

Oh Yeah I also forgot to mention that although you cannot
create energy, you can add it to the glider by flying in air
going up faster than you are sinking thru it.........................

Last time I looked at total energy systems, it read airspeed
(kinetic energy) and barometric pressure (potential energy)

Scott



"szd41a" wrote in message
...
YOU CANNOT CREATE ENERGY UNLESS YOU FIRE YOUR ENGINE!!!!!!!
"Scott Correa" a écrit dans le message de
...
Mark.
What about the L/D polar being skewed to the right to the benefit of
the
higher
wing loaded vehicle. At VNE the heavier a/p is cleaner and will glide
farther.
If both a/p's pull up together, the cleaner a/p runs out of energy
last.
It
looks to me like
heavier climbs further.....

Scott


"M B" wrote in message
...
Since mass is a constant factor on both sides of the equation, it
cancels out. Therefore there should theoretically be negligible
difference
in the pullup altitude gained between the ballasted and unballasted
cases.True except for two things:The ballasted glider has more induced
dragwhile at the same airspeed as the unballasted oneThe ballasted
glider
also has a higher stall speedSo the unballasted glider will go
higherMark
Boyd