[jhb_airlines] Re: Gross Weight

  • From: "Bones" <bones@xxxxxxx>
  • To: <jhb_airlines@xxxxxxxxxxxxx>
  • Date: Fri, 17 Dec 2004 21:14:38 -0000

It's a good idea Gerry but you would need a set of gauges really. =
Something
that could measure the 156,000kg weight of a Boeing isn't going to be
accurate in showing the weight of a C150 at 750kg..

Actually I've just had a thought. If the gauge could be calibrated to =
each
aircraft's AUW (which is in the aircraft.cfg file) then it could indeed =
be
made to suit every aircraft. This is assuming a needle type gauge as =
opposed
to a digital readout.

A digital readout shouldn't be a problem in terms of calculation. It =
would
only be necessary to take the aircraft empty weight and add the fuel =
weight
plus the cargo/passenger/crew weights. All of these are in the =
aircraft.cfg
file. The fancy bit about creating the readout in XML is well beyond me
though..

Having got the weight and the known stall speed (both flaps up and down) =
you
can calculate some of the speeds. Approach speed is generally taken as =
stall
speed x 1.25 and so you could use a simple formula here of actual =
weight/AUW
x Stall speed x 1.25 to work out the approach speed for all weights. At =
All
Up Weight (or MTOW - Maximum Take off Weight) the figure is simply the
published stall speed x 1.25 but you will find a drastic reduction in =
speed
as weights reduce.

V1, Vr and V2 are more complex to calculate as they are also determined =
by
temp and airfield elevation (density altitude) and runway length may =
also
become a factor. It is more common these days for airliners to have take =
off
power determined by the above factors and the aircraft perform a reduced
power take off rather than use full power. If you can't get any data to =
work
out these speeds you can always aim for a safe setting and make Vr =3D =
stall
speed for the actual aircraft weight..

bones

bones

-----Original Message-----
From: jhb_airlines-bounce@xxxxxxxxxxxxx
[mailto:jhb_airlines-bounce@xxxxxxxxxxxxx] On Behalf Of gwinsk@xxxxxxx
Sent: 17 December 2004 18:34
To: jhb_airlines@xxxxxxxxxxxxx
Subject: [jhb_airlines] Re: Gross Weight


As we try to get nearer to some aspects of real life practice, selecting =
the
appropriate V=20
speeds, rather than a singe FS9, value, seems appropriate.
For some of the available aircraft we have tables of gross weight and V
speeds. The=20
Falcon 50 has a gauge that displays current weight, so that correct =
figures
may be=20
chosen, before takeoff and landing approach. Rather than have to go into =
the
FS9 menu=20
for current weight, on other a/c, does anyone know of a gauge that can
display this=20
data? The Falcon gauge is specific to that aircraft.

Gerry Winskill
gwinsk@xxxxxxx





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