Shipbucket

The original Rolls-Royce Medway would have been more than powerful enough. BAC wanted the Medway in the TSR.2 but the Ministry of Supply insisted on the Bristol Siddeley Olympus (with an eye to saving money by looking ahead for the needs of the Concorde programme). Had the DH.121 had Medways from the start it would have been bigger and much more comparable to the Boeing 727 and there wouldn't have been a need for a 'Super' Trident (it would have been a Super-Super Trident!).

_________________
Hood's Worklist
English Electric Canberra FD
Interwar RN Capital Ships
Super-Darings
Never-Were British Aircraft

The Avro 776 has any relationship with the Ultra Trident (Super-Super)?

Yes, the Avro 776 would be closest to what the original DH.121 could have been like, but that Medway was not exactly the same engine (see below). Not a Super-Trident in the real sense since a standard Trident would have been closer to a Super Trident. The RB.140 Medway Trident of July 1957 had an all-up weight of 107,000lbs, cruising speed of 585mph at 32,000ft and could carry 79 passengers five-abreast at 38 inch pitch or 98 passengers at 34 inch pitch. The authorised February 1958 Trident with RB.141 Medway engines had a take-off weight of 130,000lbs, could carry 110 passengers over 260-865nm stage lengths and maximum range was 1,800nm. Then BEA got cold feet and drastically cut the size of the DH.121 it wanted...

The RB.140-141 Medway by-pass turbofan in 1957 was designed for 10,400lb static thrust. Development costs were estimated at £5 million. By 1958 Rolls-Royce were looking at 12,000lb thrust and then 14,000lb thrust in future developments which would allow them to rival the Olympus. The reheated RB.142/3 (14,000lb dry thrust) was proposed for the P.17A by English Electric
In November 1959 work stopped due to lack of orders and Rolls has spent £4.7 million and had nine test engines with 1,550 hours of testing complete. They proposed a series of derivatives to keep the programme alive. The RB.177-2 Medway was proposed for OR.357 and was the engine on the Avro 776. The RB.177-2 was rated at 22,000lbs and had a larger by-pass duct, reduced stage LP compressor, extra stage HP compressor, shorter combustion chambers and a modified LP turbine. The likely cost was £5.5 million, plus a further £3 million of future development up to 1971. The seventh RB.141 Medway was taken out of storage and tested to 17,500lb thrust. The other planned derivative was the RB.142 Medway with rotating cascade deflectors for use on the OR.351 STOL transports rated at 17,300lbs initially and 18,290lbs later. Alas, none of these ever materialised but it did lead to the later by-pass families from Rolls-Royce.

_________________
Hood's Worklist
English Electric Canberra FD
Interwar RN Capital Ships
Super-Darings
Never-Were British Aircraft

Thank you a lot about the information, after some searching of my own and I will return with new comments.

After research, I found the RB.141 Trident seems equivalent with the Boeing 727-100. The Spey Trident was underpowered, especially the 3B .The RB.140 Trident is a Spey Trident 2E in capacity.

The most balanced Spey trident is the 2E, with 2.66 Imp. Gal/St. Mile and the 3B rises to 3.747 Imp. Gal/St. Mile, while the Chinese 3B has 3.158.

The Trident was first thought to be equivalent with the Boeing 727-100, so the 2E seems to provide the fuselage, wings from Avro 776 and of course triple Medways with 42,000 lbf thrust. This combination perhaps had more fuel capacity from the Spey Trident 2E (if is same with the B727-100, 6730 Imp.Gal, and with 2.66 from above) range would be 2530 St miles. With the wing tanks HS.800 has fuel rises to 8730 Imp. Gal, range perhaps would be between 2900-3150 St. Miles. With larger wingspan, fuel capacity could be even greater.

An development of that Trident would be similar with the B727-200, with the 17000lbf Medway.

Finally I have the HS.800 above the Avro 776 for comparison with some notes. Wingspan calculation is uncertain. Also the HS.800 has larger fuselage and bombay. I have also the wingtip from VC.10 for comparison with that on HS.800.

Concluding from above, we have:

Handley Page Herald : RAF choice for light transport
Armstrong AW.681 : RAF choice for strategic transport.
Tanker/EW/AWACS (AEW)/Freighter : Vickers VC.10

However, two questions occur:

-Any possible export customers for above aircraft? India purchased the Il-76, which aircraft Britain could offer instead?
-Avro 776MPA or Nimrod ?

Somewhere I came across this, called "Super Lighting". Did this proposed? Or can be used for creating an AU "Lighting"?

it's fairly interesting to go from an side intake to engines which are on top of each other. I think it would be likely that the engines would be placed side by side, resulting in an all new aircraft
while the idea is not bad IMO, an chin intake would be more likely (but hard to get large enough, I think)

_________________
Drawings are credited with J.Scholtens
I ask of you to prove me wrong. Not say I am wrong, but prove it, because then I will have learned something new.
Shipbucket Wiki admin

For a chin intake with twin engines like the Lightning, you'd basically be looking at something akin to the Nord Griffon;

_________________
"The first rule is not to lose; The second rule is not to forget the first rule"

Or a rocket engine

_________________
“Close” only counts with horseshoes, hand grenades, and tactical nuclear weapons.
That which does not kill me has made a grave tactical error

Worklist

Source Materiel is always welcome.

Perhaps a chin intake (like Nord Griffon) seems better, but this Super Lighting design seems like a "deviation", created by someone who does not know much about aircraft design combining with much fantasy.

What is British fighters is the largest chapter to opened in this thread, followed by helicopters, we have many interesting designs here as well. What about the transport fleet I wrote above?

And two links with very interesting staff/history:

http://warships1discussionboards.yuku.c ... yqTlKKt-40 From a forum with AU British Bombers and history
http://www.britmodeller.com/forums/inde ... tic-cmk-2/ An model of Avro 722 Atlantic in RAF green camo