#43985 - 12/12/99 10:42 AM
Inertial initialisation on carriers, Andy.
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Joined: Dec 1999
Posts: 2,704
Billzilla
Senior Member
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Senior Member
Joined: Dec 1999
Posts: 2,704
Brisbane, QLD, Australia
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Hi there, I was taxying around on the carrier in Flanker 2.0 a couple of days ago, and i noticed that the ground speed readout was up to about 45kph or so. I know that inertial reference systems have inherant errors, so I didn't worry about it too much. But what it was reading became very obvious when I taxied (quickly!) towards the rear of the carrier - Not surprisingly, the GS readout decreased down to near zero ... When we initialise the INS in my 747-200 (The ratty ol' Delco boxes, FWIW) we are required to maintain the aircraft dead stationary, until we select 'NAV' on the mode selector.
So, I was wondering just how the INS/IRS systems are initialised on carrier borne-aircraft? I assume that there must be a platform leveling stage, then the military nav systems must allow you to feed in a (sort of) general lat/long, then as the alignment is refined you can quickly feed in the actual position.
Regards, Bill Sherwood. 750 hrs 747-238 ~2000hrs Citation 2 ~2000hrs Metro 2
Out of ammo Out of energy Out of ideas Down to harsh language
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#43986 - 12/12/99 11:32 PM
Re: Inertial initialisation on carriers, Andy.
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Joined: Dec 1999
Posts: 2,704
Billzilla
Senior Member
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Senior Member
Joined: Dec 1999
Posts: 2,704
Brisbane, QLD, Australia
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Another quick question, before I forget - I have a friend who was in the German Airforce, and he said that they tried a rocket on the back of the F-104 to basically see how fast the darn thing could go. It all sounds like the various amounts of BS that you often hear in the bar's at airports, but normally this guy is pretty straight. He said that they took everything out of the F-104 that wasn't required for flight, eg, all radar gear, etc, and polished the airframe skin to a high mirror finish. They (apparently) then took off, ran it with full AB until it got to about M2.1 or so, then hit the rocket, which then took it to M4 (!!!!!!!) He also said that the Canadians did the same thing. Like I said, it all sounds like BS to me ...
Out of ammo Out of energy Out of ideas Down to harsh language
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#43988 - 12/13/99 09:54 AM
Re: Inertial initialisation on carriers, Andy.
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Joined: Dec 1999
Posts: 2,704
Billzilla
Senior Member
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Senior Member
Joined: Dec 1999
Posts: 2,704
Brisbane, QLD, Australia
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Yeah, like I mentioned, it sounds like a bunch of BS ... As for why you'd want to do it - Heck! Why not? It's darn fast! I also doubt that the airframe would be able to do those sorts of speeds, not only for the inlet air temp, but for the dynamic air pressure on the nose area, which I reckon would cause it to become laterally unstable. FWIW, I'd love to have a fly of an F-104 one day - It's just the sort of aircraft I like; wing loadings that can be measured in units of tons per sq inch!
Out of ammo Out of energy Out of ideas Down to harsh language
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Exodus
by RedOneAlpha. 04/18/24 05:46 PM
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