what type of hangar

Carnaby wrote:

PJH wrote:

If it's for flying boats, I'm going to guess Type B at Pembroke Dock.

That would have been my guess too. I note the picture filename is hangarrhu_
I'm not sure what sheds Helensburgh / Rhu had, though a photo on this page looks similar to the OP picture.
www.helensburgh-heritage.co.uk/index.php...ge/military?start=14

The article shows a photo of the Blackburn B20 outside a hangar door similar to the one above; it states the B 20 was to be tested by Helensburgh but wiki says it never got there havng been destroyed on 7 Apr 1940 during test flying at Dumbarton, so the hangar door shown could.be Dumbarton.
Incidentally the article says the Blackburn test pilot on that last flight, Flt Lt Harry Bailey, warned the other occupants 'to be ready for a maximum speed test run on the two Rolls Royce 170hp engines'. 345 mph on a total of 340hp? They were actually RR Vultures producing 1720hp!!

Valid point. The question now is did the Blackburn Aircraft Company factory adjacent to the tidal basin and facing Castle Street (not Castle Road!) have a hangar and, is so, what type?

This Britain from Above image dated 1948 suggests not:

britainfromabove.org.uk/en/image/SAW019763

More images of the B20 and Dumbarton hangar here with part of Dumbarton 'rock' in the background:

dingeraviation.net//B20/blackburn_b20.htm

EDIT

Correcting my earlier post one of the factory sheds WAS on a 'Castle Road' and a 1964 OS 1250 scale map viewed on the 'Old Maps website suggests that the 'hangar' in the photographs is the shed on Castle Road adjacent to 'The Rock' The lack of door extension rails in the photographs suggest side opening doors.