Re: [Flightgear-devel] Re: [Flightgear-cvslogs] Base CVS update:'FlightGear/FlightGear/Aircraft/c172'

2002-09-19 Thread Alex Perry

> Does the R have a 40 deg flap detent?

My understanding is that the 40 deg flap setting (over the whole family) 
is actually related to max gross weight.  If you want the 40 deg then you
will be limited to 2300 lb; if you make do with 30 deg ... you can have more.

However, as the interior gets nicer, the avionics become more complete,
you add long range tanks, a larger engine, retractable gear, etc etc ...
you're adding empty weight, so that after a while 2300 lb is not enough.
You're then _forced_ to eliminate the 40 deg setting to be able to fly.

The last ten degrees _are_ mostly drag, but that's what you need
(a) to get a steep final in rugged terrain
(b) for fast descents in emergency management
(c) for a relatively quick flare for short fields

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Re: [Flightgear-devel] Re: [Flightgear-cvslogs] Base CVS update:'FlightGear/FlightGear/Aircraft/c172'

2002-09-19 Thread Alex Perry

> I don't really object to that -- except that I wonder how many folks
> will be able to really tell the difference.  Surely, even in the real
> thing, the differences are fairly subtle. I'm also not so sure that we
> have the fidelity that making that distinction implies.

I recommend the split, although I'd tend to move the "P" back to "N".

Analogy: Think of driving two cars
- one has carb engine, the other fuel injected (you really care in winter)
- one has ABS, the other does not (only matters if you brake hard)
- one has sports suspension and the other regular (only for bad roads etc)
In normal city traffic, you won't notice the difference.
However, for emergency stuff, if you forget ... you'll probably die.
When operating at full performance (eg mountain roads for skiing) ditto.


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Re: [Flightgear-devel] Re: [Flightgear-cvslogs] Base CVS update:'FlightGear/FlightGear/Aircraft/c172'

2002-09-19 Thread David Megginson

Alex Perry writes:

 > The last ten degrees _are_ mostly drag, but that's what you need
 > (a) to get a steep final in rugged terrain
 > (b) for fast descents in emergency management
 > (c) for a relatively quick flare for short fields

Speaking of quick flares, I'm finally getting the hang of *raising*
the flaps to shorten my flare on shorter fields (not when the wheels
are higher than a few inches above the runway, of course).


All the best,


David

-- 
David Megginson, [EMAIL PROTECTED], http://www.megginson.com/

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Re: [Flightgear-devel] Re: [Flightgear-cvslogs] Base CVS update:'FlightGear/FlightGear/Aircraft/c172'

2002-09-19 Thread Alex Perry

> On Thu, 2002-09-19 at 06:52, Alex Perry wrote:
> > The last ten degrees _are_ mostly drag, but that's what you need
> > (a) to get a steep final in rugged terrain
> > (b) for fast descents in emergency management
> > (c) for a relatively quick flare for short fields
> (d) to keep %N1 up (for faster spool up) in a jet.

I'd _love_ to have concern in a C172 (grin).

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