Charlie Hotchkiss wrote:
So, just for discussion's sake and noting that nobody with detailed
knowledge of and experience with this aircraft has weighed in, I have
questions. Isn't the L/D ratio at high angles of attack different
(poorer) when in ground effect?
Actually, it's better.
[I combined a bunch of responses to avoid repeating myself.]
Just for an I told you so moment: the gear and aero modelling (but
sadly not the propeller, see below) in YASim was doing everything
properly. The plane was being modelled perfectly,and (almost) all the
effects reported were
Andy Ross writes:
I tried that, and it's an improvement, but the tailwheel seems to
slide sideways too easily.
Really? When I tried it, I couldn't turn against the tail wheel at
all, even with full braking applied. The tail wheel didn't move until
50 kts or so when it lifted;
Andy,
Bingo. This is a bug in the propeller code; I apparently introduced a
FPU explosion when the thing is going backwards. It has nothing to do
with the aero or ground modelling, so I was looking in the wrong
place. I'll get this fixed. (I'm pretty sure it used to work -- I
remember
I wrote:
Major A wrote:
I think the main problem really is the rapid increase in airspeed,
which is unnatural, and doesn't occur if both engines are used.
Bingo. This is a bug in the propeller code [...] (I'm pretty sure it
used to work -- I remember doing hammerhead stalls in the A-4
Andy Ross wrote:
[I combined a bunch of responses...
Once the tailwheel leaves the ground, it's squirrely but controllable.
This is not doubt bad form, but I found that holding the stick back to
keep the wheel firmly on the ground during the takeoff roll until the
aircraft took off on
Charlie Hotchkiss wrote:
Perhaps I'm showing some ignorance here (I'm certainly not a pilot,
much less an expert), but isn't the induced drag in that situation so
large as to preclude reaching flying speed? The wings acting at that
angle much like a drag brake? I read somewhere that pilots
OK, I found an explosion case in the propeller code which could be
triggered by a propeller turning backwards very slowly. That's pretty
much consistent with a aircraft with a stopped engine, so I'm
hopefully this is it. It's been checked in (this was obvious enough
to check in based on
Andy Ross writes:
Now, that number comes ruler and protractor work on a 3-view diagram.
It's possible that I missed a measurement, and that the ground AoA
should be much larger. It also assumes a build in wing incidence of
0, which may not be true on the real aircraft (I couldn't find
* [EMAIL PROTECTED] (David Megginson) [2002.05.23 13:59]:
Andy Ross writes:
The tech drawings at
http://www.douglasdc3.com/dc3tec/dc3tec.htm
(especially the big one at the bottom) suggest to me an angle of
incidence of 2-3 degrees, but I haven't printed them out and measured.
As far
Andy,
I'm really just exploring near stall modeling issues so that our simulation
can be improved. Anyway you can get a bird in the air is reasonable,
especially if it shows up weaknesses in modeling.
So, just for discussion's sake and noting that nobody with detailed
knowledge of and
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