[jhb_airlines] Re: Performance Query

  • From: "Bones" <bones@xxxxxxx>
  • To: <jhb_airlines@xxxxxxxxxxxxx>
  • Date: Fri, 19 Aug 2005 06:10:41 +0100

I hate RPN as I never really get my head round it.

I'm guessing here but is the stack reversed? I'm not sure in:

(A:TOTAL WEIGHT,pound) (L:VSPEED_LOW_WEIGHT,number) - * +

which the negative number applies to. Negative Total Weight x positive Low
Weight seems odd..

Have a try with:
(A:TOTAL WEIGHT,pound) (L:VSPEED_LOW_WEIGHT,number) 1000 / - * +

or maybe
(A:TOTAL WEIGHT,pound) 1000 (L:VSPEED_LOW_WEIGHT,number) / - * +

but I admit it's a guess...


-----Original Message-----
From: jhb_airlines-bounce@xxxxxxxxxxxxx
[mailto:jhb_airlines-bounce@xxxxxxxxxxxxx] On Behalf Of Gerry Winskill
Sent: 18 August 2005 18:10
To: jhb_airlines@xxxxxxxxxxxxx
Subject: [jhb_airlines] Re: Performance Query

It struck me I might be able to get around the comma problem, when using
both the Vspeed gauge and your weight gauge.
In the case of Vspeed, a version has to be created for each individual
aircraft, by editing the source file and inserting the high and low
takeoff weights to be covered, together with their Vnumbers at the flap
settings permitted for takeoff config. No problem there.
It considers actual Ramp Weight and signifies an over load, when
present. That's the current problem with the Q400. The warning could be
ignored but the calculated V numbers are daft, having been based on the
comma'd weight. Now, if I include a factor of 1000 in the calculation,
that might restore sanity.

The existing line is
(A:TOTAL WEIGHT,pound) (L:VSPEED_LOW_WEIGHT,number) - * +

If I want to multiply the TOTAL WEIGHT by 1000, what's the syntax?

Gerry Winskill

Gerry Winskill wrote:

> I've spent the day, well most of it, modifying Rob Barendregt's Vspeed
> gauge, to suit my normal CA aircraft. Once his instructions are
> decyphered it's not too difficult.
> The sticking point at the moment is that next in the queue is the Q400
> and I haven't any real life data for it.
> What I'm looking for is the Vnumber data for lowest and highest take
> off weights, at the normal flap settings used. The Bombardier website
> doesn't have it. Anyone able to suggest a site where I might find it?
> The gauge is useful in that it also provides the speed calls, filling
> the empty second seat gap.
> Gerry Winskill
> gwinsk@xxxxxxx

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