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Vickers Tay-Viscount--  
User currently offlineZippyjet From United States of America, joined Sep 2001, 5751 posts, RR: 12
Posted (12 years 1 month 1 week 3 days 21 hours ago) and read 3124 times:

Anybody have information or better yet photos of the "Vickers Tay-Viscount" prototype? This was a Vickers Viscount minus the four Dart turboprop engines. In its place were two Rolls Royce "Tay" jet engines. Was this a swept wing jet or, did it keep the rounded fixed prop plane wings? Also, with the turboprop Viscount, I've noticed some examples had an egg shaped passenger door/hatch; while others had a more conventional looking door. In my opinion, I prefer the non Ovid design. The Ovid doors in my opinion made this early tuboprop look disproportionate taking on a tubby appearance.

I'm Zippyjet & I approve of this message!
3 replies: All unread, jump to last
User currently offlineMariner From New Zealand, joined Nov 2001, 27672 posts, RR: 81
Reply 1, posted (12 years 1 month 1 week 3 days 20 hours ago) and read 3107 times:

There's this:


and this:


and this history:


Best I can find.



aeternum nauta
User currently offlineM404 From United States of America, joined Nov 2003, 2258 posts, RR: 4
Reply 2, posted (12 years 1 month 1 week 3 days 20 hours ago) and read 3100 times:
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Did this prototype ever fly? I've loved this type since my first flight on it in 1961 and appreciate the history lesson so far.

Less sarcasm and more thought equal better understanding
User currently offlineClassicLover From Ireland, joined Mar 2004, 4961 posts, RR: 22
Reply 3, posted (12 years 1 month 1 week 3 days 19 hours ago) and read 3085 times:


From the book Viscount, Comet & Concorde by Stewart Wilson -

"With the slowdown of the Viscount development programme over the northern winter of 1947-48 came the decision to complete the second V.630 prototype as a testbed powered by two 6,250lb thrust Rolls Royce Tay centrifugal flow turbojets in place of the usual four Dart turboprops. Redesignated the Type 663, the aircraft flew for the first time from Vickers' Wisley airfield on 15 March 1950 carrying the military serial number VX217. The allocated civil registration G-AHRG was not taken up.

The 663 retained the same overall dimensions as the V.630 Viscount prototype, the changes incorporated revolving around the installation of the two Tays which were mounted in underwing pods each incorporating a revised main undercarriage design. The Tay-Viscount made only one public appearance, at the 1950 SBAC show in Farnborough where it caused something of a sensation with the turn of speed and rate of climb it displayed. Performance figures were never published.

The aircraft was used by the Ministry of Supply for various tests and trials including high altitude tests of the Boulton Paul powered control system for the Vickers Valiant bomber. It then became the first aircraft in the world to fly with an electrically signalled flight control system (fly-by-wire these days) and was also used by the Decca Navigator company.

The Tay-Viscount survived until 1958 when it was damaged beyond repair in a hydraulic fire having logged just 110 very useful flying hours."

Hope this helps!


Trent Big grin

I do quite enjoy a spot of flying - more so when it's not in Economy!
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