Yesterday was an anniversary of sorts...........In 1991, it hit 122 degrees in
Phoenix, the hottest day ever. They shut down the airport because none of the
airlines had take-off data for air that hot. And man, was it
hot.................
Ed
John Beckett wrote:
> I can tell you about my air density situation trying to get a 747 off a
> short runway in Cairo in the middle of summer. Long story, but sucking the
> landing gear up at the end of the runway was a little un-nerving.
> Hot, dry air is considerably less dense. And at the speeds were running at
> Bonneville it makes a difference.
>
> John B
> ----- Original Message -----
> From: "DrMayf" <drmayf@teknett.com>
> To: <kturk@ala.net>; "Dick J" <lsr_man@yahoo.com>; <Want1937hd@aol.com>;
> <edvs@uswest.net>
> Cc: <land-speed@autox.team.net>
> Sent: Wednesday, June 27, 2001 1:28 PM
> Subject: Re: Slugs
>
> > Don't know squat about salt wetness. But if air is denser then it takes a
> > linear amount of horsepower to overcome the increased drag caused by it.
> Hot
> > air is less dense, reduces lift and drag. Also hot air decreases HP. But
> for
> > those on juice or pressurized and intercooled, then makes not much
> > difference. So if those conditions are met, run at the hottest part of the
> > day. For normal aspirated run at mid morning.
> >
> > And Keith, why does an educated college dude like yourself pretend to be
> > dumb? You went to Emory Ridel or somewhere didn't you?
> >
> > mayf, the rednecked, very ignorant, desert rat, just ask anyone!
> >
> > >Subject: Re: Slugs
> >
> >
> > >
> > > Okay let me see..... Air density is a critical factor in determining
> > > Drag... >
> > > We have talked about this Many times on the list.... Dave Dahlgren and I
> > > were chatting about it yesterday on the phone.... and we found several
> > > factors besides air which might attribute the Morning Passes to being
> > > slower then the afternoon passes. I'll pitch a couple of theory's out
> > and
> > > let Mayf give us his hypothesis on them ... ( someday I'll learn what
> that
> > > word means.... just dont' teach me now I like being ignorant )
> > >
> > > 1. The Salt is wetter in the morning then it is in the afternoon.? ( I
> > > think this is true.... any decenters?
> > >
> > > a. Wet salt provides worse traction
> > > b. Wet salt increases Rolling resistance
> > >
> > > 2. The air is denser in the morning.
> > >
> > > a. Dense air increases the drag because there are more slugs per mass
> > > volume of air.
> > > b. Dense air makes more Hp but not enough to over come the increased
> > > drag associated with the dense air.
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