OK,so..... why not.... Change the Pump.....? Better to start the Orph you have - safely....?Renegadenemo wrote: ↑Sun Jul 01, 2018 8:07 pm Now if we had that type of pump we'd be OK. Ours predates the HM governor and generates servo by basically centrifuging fuel through drillings in the pump rotor. It's therefore dependent on rotor speed rather tapping into delivery pressure. Seeing as the servo strokes the pump it's easy to see why we had to go light on all the settings to get the engine to start. we have a couple of Orph' 101s with the later pump and the one we have run and instrumented uses double the servo pressure and generates it instantly.
Technical Talk
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Re: Technical Talk
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Re: Technical Talk
Because it's the original one that pumped fuel on the 4th January 1967
I'm only a plumber from Cannock...
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"As to reward, my profession is its own reward;" Sherlock Holmes.
'It ain't what they call you, it's what you answer to.' W.C. Fields.
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Re: Technical Talk
Ah.....Renegadenemo wrote: ↑Sun Jul 01, 2018 8:47 pm Because it's the original one that pumped fuel on the 4th January 1967
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The whole fuel system with the exception of the AFRC is original. The AFRC came from a crashed Gnat and was lying in the cellar at Shaftmoor Lane. K7's fuel system didn't have one. It had a primitive anti-surge control, one of only two ever made, and described in its own test report as a 'lash up'.
I'm only a plumber from Cannock...
"As to reward, my profession is its own reward;" Sherlock Holmes.
'It ain't what they call you, it's what you answer to.' W.C. Fields.
"As to reward, my profession is its own reward;" Sherlock Holmes.
'It ain't what they call you, it's what you answer to.' W.C. Fields.
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Re: Technical Talk
Ah.... again. My knowledge of the Orf is almost zero.....Renegadenemo wrote: ↑Sun Jul 01, 2018 9:37 pm The whole fuel system with the exception of the AFRC is original. The AFRC came from a crashed Gnat and was lying in the cellar at Shaftmoor Lane. K7's fuel system didn't have one. It had a primitive anti-surge control, one of only two ever made, and described in its own test report as a 'lash up'.
The Orff in K7 was - both times - a 700 series engine. The 2nd engine was 711 - so - there must have been 11 of them, at least.....? And 711 definitely came out of a scrap Gnat that DMC bought, for parts & spares.
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We could conclude that Engines 709 & 711 were effectively Flight Test engines - no more. Airworthy, but only just - lols.
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As I understand it, 711 flew but if the other one did it's either not recorded or i've not heard of it doing so. The fuel system dates back to 1959 and was a very early version. It was a real challenge to get it back to running order then mate it to a later 101 core engine such that it would all work - one of our most complex and proud restoration/conservation efforts backed by Rolls-Royce Plc even though they sought to distance themselves from it all post-Shoreham.We could conclude that Engines 709 & 711 were effectively Flight Test engines - no more. Airworthy, but only just - lols.
Sorry, R-R, we're still grateful for all your help and will continue to tell people that you made this possible.
I'm only a plumber from Cannock...
"As to reward, my profession is its own reward;" Sherlock Holmes.
'It ain't what they call you, it's what you answer to.' W.C. Fields.
"As to reward, my profession is its own reward;" Sherlock Holmes.
'It ain't what they call you, it's what you answer to.' W.C. Fields.
Re: Technical Talk
Are you sure? The purpose of a hydraulic accumulator, in addition to storing pressure, is to smooth out the pulses from the pump and protect the system from any "hammer blow" effect.Renegadenemo wrote: ↑Sun Jul 01, 2018 4:02 pm We had a failure with the hyd when the accumulator let go but we can run without that.
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Re: Technical Talk
The Shoreham Hunter crash....? https://en.wikipedia.org/wiki/2015_Shor ... show_crashRenegadenemo wrote: ↑Mon Jul 02, 2018 1:00 am As I understand it, 711 flew but if the other one did it's either not recorded or i've not heard of it doing so. The fuel system dates back to 1959 and was a very early version. It was a real challenge to get it back to running order then mate it to a later 101 core engine such that it would all work - one of our most complex and proud restoration/conservation efforts backed by Rolls-Royce Plc even though they sought to distance themselves from it all post-Shoreham.
Sorry, R-R, we're still grateful for all your help and will continue to tell people that you made this possible.
Not surprised - corporate liability & image and all that. RR (IMO) has always been at best a reluctant supporter of any speed record. The support for K7's Fuel System was from AEC - when they were part of RR, but still more... free wheeling. Less Treacle....
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Re: Technical Talk
A late friend of mine worked at BS in the sixties. He had this to say about XM691Engine 711 wrote: ↑Sun Jul 01, 2018 10:31 pmWe could conclude that Engines 709 & 711 were effectively Flight Test engines - no more. Airworthy, but only just - lols.
It would be silly to say that I knew XM691 well, but it feels like it. It was used by Bristol Siddeley not only for flight test, but also a chase plane, for observation and for photography. The in-flight photograph of the Valiant, used briefly as Pegasus test bed, was probably taken from it.
In 1964 or thereabouts, in the course of my apprenticeship, I spent two weeks in the Flight Shed, and XM691 was there. It was much used and much liked.
Pegasus of course had its origins in the Orpheus, later powered the Harrier.