> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of
> David Megginson
> Sent: 27 July 2004 12:39
> To: FlightGear developers discussions
> Subject: Re: [Flightgear-devel] Tried the Spitfire
> Vivian Meazza wrote:
> > I don't think that's intrinsically very difficult to simulate right
> > now. When certain conditions are met, if carb heating is
> off, weaken
> > the mixture over time (until the engine stops?). If carb
> heating is on
> > enrich the mixture over time until power is restored. The
> > are actually aircraft and engine specific, I think, but a general
> > solution might be near enough for government work.
> With carb ice, the engine dies from an excessively rich
> mixture (all fuel,
> no air), not an excessively lean one. The best way to
> simulate an ice
> blockage would be to reduce maximum available manifold
> pressure and let the
> piston engine model work out the rest.
> When there is no actual carb ice, carb heat makes the intake
> air hotter, and
> thus thinner, so the mixture also becomes richer (more fuel,
> less air), but
> in this case not usually rich enough to stop the engine.
> The normal rule of thumb is that applying carb heat will
> decrease your
> power, but that's not true for those of us who fly lean of peak.
> > Pitot head icing is another candidate. Actually it's so obvious, I
> > wonder if someone will tell us that it is already an intrinsic
> > function?
> We don't actually have code to create pitot ice (or melt it
> when pitot heat
> is on), but you can simulate pitot icing by setting the
> /systems/pitot/serviceable property to 'true'. You can also use
> /systems/static/serviceable to simulate a static-port blockage,
> /systems/electrical/serviceable to simulate an electrical
> failure (battery
> and alternator, I guess), and /systems/vacuum[n]/serviceable
> to simulate a
> failure of a vacuum pump. All of the instruments should respond
> more-or-less realistically to the failure.
I knew someone would know. Yes of course carb icing makes the mixture over
rich - leaning it was a quick stab at reducing the power. Your suggestion is
obviously the way to go. Much more realistic. Thanks.
I think we could easily extend the existing pitot stuff to be a bit more
realistic with some nasal.
Bit of a roundtuit I'm afraid though, I really ought to finish the Spitfire
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