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- Path: sparky!uunet!gatech!usenet.ins.cwru.edu!agate!dog.ee.lbl.gov!hellgate.utah.edu!lanl!beta.lanl.gov!masten
- From: masten@beta.lanl.gov (David A. Masten)
- Subject: Re: Power User Review: F15III
- Message-ID: <1993Jan8.063853.10959@newshost.lanl.gov>
- Sender: news@newshost.lanl.gov
- Organization: Los Alamos National Laboratory
- References: <1993Jan3.053523.22977@netcom.com> <1993Jan3.154301.9261@newshost.lanl.gov>
- Distribution: na
- Date: Fri, 8 Jan 1993 06:38:53 GMT
- Lines: 58
-
- First, a random point about F15III and the WCS, since someone mentioned
- it recently. If like me you don't want to shell out $25 for a new prom,
- or at least want to wait for the programmable one, use the F15II
- setting, dip switch 1. It gives you thrust (including AB), flare,
- chaff, and brakes.
-
- Now some clown said :-) :
- >Which may explain why you don't think there is something amiss with an
- >F15 that can only go about 400 knots in AB at 30K feet (yes, clean and
- >near empty of fuel).
- >
- >See above comments about high altitude speed. It also can't even hold a
- >30 degree climb without bleeding speed at any altitude (yes again
- >without all the ordnance weighing it down).
-
- Well after having been informed by email a few times that what the HUD
- is showing is 'indicated airspeed' not 'true airspeed', and having
- denied this based on some of my anal tests, I have to eat some humble
- pie (but only a small slice!).
-
- My first test of distance covered (toward a waypoint) in a given time
- resulted in a calculated speed (ground speed) close to that on the
- HUD which would mean the HUD read TAS. But I must've screwed up as
- every other time I've checked, the ground speed was way higher than
- the HUD. In fact, it comes close to the mach number x sound speed
- (altitude dependent). So yep, looks like it is IAS.
-
- So, its really not too bad in that aspect.
- And the climb isn't too bad either (I've gotten as high as about
- 45K ft/min for the first few seconds after starting a climb from
- low level and high V).
-
- But...
- The HUD's IAS doesn't seem to be correct, can someone tell me exactly
- how it is measured. Am I correct in that it is different at supersonic
- than hi subsonic, and hi subsonic is different than low subsonic (must
- account for compressible air)?
-
- I was able to pull 9 G's and 7+ sustained at 60K ft. Pretty sure these
- are no-no's.
-
- Like that ceiling at 60K ft. And I mean ceiling. You just about bounce
- off it!
-
- Still can't get more than about mach 1.2 in level flight at 36K ft.
- This is where the F15 should reach it's highest mach of about 2.5.
- Instead, it reaches m2.3 or so at 60K, which I don't think the plane can
- do due to lack of thrust.
-
- And I haven't seen an AOA greater than about 4 degrees either.
-
- Anyway, the modelling isn't horrible, but ain't too hot either. Stick
- to low level ground attack!
-
- When's the next flight sim coming out :-)
-
- Dave
- masten@beta.lanl.gov
-