Looking for advice: ex Jaguar GR1(a) pilots/maint.
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Jaguar NAVWASS
Ah NAVWASS! An amazing system that always knew when the cloud base was low and displayed a 'Big Cross' on the HUD when the wheels were selected up. Just enough time to check the HDD was vaguely indicating the correct horizon before the world disappeared. Happy memories!
lm
lm
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NAVWASS was great - even when it dumped, with a regular bunging in of the wind you got a map of the country - not er.. necessarily where you were in it, but nonetheless the country you took off in.
When 1064 went you were gone gone gone.
Ackle, ackle, phase change, regress PLF PLND...
When 1064 went you were gone gone gone.
Ackle, ackle, phase change, regress PLF PLND...
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CS,
The original Jaguar procurement was as the RAF Advanced Flying Training platform, so that possibility could have happened. However, it was quickly realised that adopting Jaguar in that role would be 'unwise' so a new role was found for Jaguar and the Hawk came along in-lieu.
The French were even thinking of embarking Jaguar on their Carrier! Flight trials quickly raised concerns, the fright of single-engine wave-offs sealed the situation - Non!!!!!
lm
The original Jaguar procurement was as the RAF Advanced Flying Training platform, so that possibility could have happened. However, it was quickly realised that adopting Jaguar in that role would be 'unwise' so a new role was found for Jaguar and the Hawk came along in-lieu.
The French were even thinking of embarking Jaguar on their Carrier! Flight trials quickly raised concerns, the fright of single-engine wave-offs sealed the situation - Non!!!!!
lm
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The original Jaguar procurement was as the RAF Advanced Flying Training platform
And, yes, I am type rated on both Jag and Harrier, and enjoyed both, so I am allowed to comment.
Last edited by Bus14; 6th Oct 2013 at 16:15. Reason: To apologise for mistakenly believing that Soaks wos not ere.
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I heard a rumour they Were looking to reengine the jag but they found a pair of lawn mower lumps overstressed the engine mounts, far too torquey.
They then tried a petrol strimmer but that was too unreliable.....
In the end they stuck with the adour and fitted a creme brûlée torch to it.
They then tried a petrol strimmer but that was too unreliable.....
In the end they stuck with the adour and fitted a creme brûlée torch to it.
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The Late Dave Oakley
Bus - "the late Dave Oakley" - are you trying to tell me something about Soaks? CB
Last edited by Canadian Break; 1st Oct 2013 at 21:24.
I would like to know about that too.
He and I were in contact a few weeks ago.
Godfather to my daughter.
edit: and please note that lightningmate and I (Lightning Mate) are not the same persons.
He and I were in contact a few weeks ago.
Godfather to my daughter.
edit: and please note that lightningmate and I (Lightning Mate) are not the same persons.
Last edited by Lightning Mate; 2nd Oct 2013 at 06:47.
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Having an interest in "Historic Early Computing" (sad I know) ... I found this article quite interesting in Flight International 1973 about the MCS.920M/NAVWASS Jag implementation and thought I'd share 
Looks to me if it might have been a direct lift from the sales blurb at the time
Flight International Jaguar NAVWASS
Also an interesting snippet here as to why it had a tendency to topple with alacrity ...
NAVWASS Avionics
Maybe a NavInst expert/technician can add more ...
Looks to me if it might have been a direct lift from the sales blurb at the time
Flight International Jaguar NAVWASS
Also an interesting snippet here as to why it had a tendency to topple with alacrity ...
NAVWASS Avionics
The NAVWASS system used a novel "rotating platform" technique where the whole instrument package rotated so that gyro drift would be nulled out (meaning that cheaper/poorer performance sensors could be used).
Unfortunately this meant that all the interface signals had to pass over slip rings: any electrical noise on these slip rings was interpreted by the nav computer as a fault and the system had a tendency to "dump" on take off. As a result of complaints by the Jaguar pilots, the system was subsequently replaced by the Ferranti FIN 1075.
Unfortunately this meant that all the interface signals had to pass over slip rings: any electrical noise on these slip rings was interpreted by the nav computer as a fault and the system had a tendency to "dump" on take off. As a result of complaints by the Jaguar pilots, the system was subsequently replaced by the Ferranti FIN 1075.
Last edited by CoffmanStarter; 2nd Oct 2013 at 13:31.
Pleasure.
The correct name for the NAVWASS rotating platform was a carousel platform.
In those days it was common way of minimising drift, and not just for the E3R platform used in NAVWASS.
BTW, the early Nimrods had the same kit.
The correct name for the NAVWASS rotating platform was a carousel platform.
In those days it was common way of minimising drift, and not just for the E3R platform used in NAVWASS.
BTW, the early Nimrods had the same kit.
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Almost right LM.
The E3R rotated one revolution every 5min 43secs and as noted the slip rings were the primary cause of Navwass dumps. The system was designed to indicate which black box was at fault, Platform (P) Platform Electronic Unit (PEU) or Power Supply Unit (PSU) but in practice (as I'm sure you're aware) all three lights would normally indicate on the NCU.
The Nimrod Mk1 was fitted with an E3 platform which did not rotate. The Mk2 had the Fin 1012. The problem with these platforms were that the gyro/accelerometer package was physically slaved to true north. However an opportunity arose when an R was in the NMSU. I was on the Nimrod development team and was encouraged to rob it of it's Delco Carousels (one rev every minute) and fit them to a couple Mk2s. On going past 90deg N the Fin 1012s continued to indicate up to an untheoretical 92.5 deg N before toppling! Needless to say the Navs didn't want to give the Carousels back.
The E3R rotated one revolution every 5min 43secs and as noted the slip rings were the primary cause of Navwass dumps. The system was designed to indicate which black box was at fault, Platform (P) Platform Electronic Unit (PEU) or Power Supply Unit (PSU) but in practice (as I'm sure you're aware) all three lights would normally indicate on the NCU.
The Nimrod Mk1 was fitted with an E3 platform which did not rotate. The Mk2 had the Fin 1012. The problem with these platforms were that the gyro/accelerometer package was physically slaved to true north. However an opportunity arose when an R was in the NMSU. I was on the Nimrod development team and was encouraged to rob it of it's Delco Carousels (one rev every minute) and fit them to a couple Mk2s. On going past 90deg N the Fin 1012s continued to indicate up to an untheoretical 92.5 deg N before toppling! Needless to say the Navs didn't want to give the Carousels back.
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Wow, NAVWASS, not heard that term in years. I spent no end of hours working in funny positions installing that lot from a kit into the Jag's as an up and coming J/T. Oh the memories of 'F' Hangar at Abingdon, is it still going?
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MOD 1114.. Getting rid of the 920 and the E3R for the INU..
MOD 1041, keeping the wings together..
F Shed died when the Army took over Abo in 1992.
DARA at Saints until 2006.. Aircraft out of there had so much wrong with them.
Any flight sim modellers, please, please, please.. JAGUAR DID NOT HAVE AILERONS!!
MOD 1041, keeping the wings together..
F Shed died when the Army took over Abo in 1992.
DARA at Saints until 2006.. Aircraft out of there had so much wrong with them.
Any flight sim modellers, please, please, please.. JAGUAR DID NOT HAVE AILERONS!!