Talk:Boulton Paul P.111

Has anyone got Brew's bbok, if that is a fairly definitive source. We need a source that someone has checked for the specs: for example some sources from the 1950s give the tip-less span as 29 ft 9 in, and also a wing area (but tippped or not?) as 200 ft². Given it was a delta, where is the 10% t/c measured?

Also, apart from the Museum link all the other external sources links seem dead. TSRL (talk) 13:45, 1 February 2009 (UTC)

This gives wing area (of 291 ft2) and length.Nigel Ish (talk) 18:42, 3 February 2009 (UTC)

Thanks for chasing this. You would think that this area was right; Flight is usually reliable and they are much closer to the time. But: if the wing were a 45 deg delta with no fuselage, the area (unclipped) should just be span²/4 = 281 ft² with a span of 33.5 ft, and the fuselage, rather wide is going to take a lump out of this. I've just been measuring up a small (2 mm = 1 ft) g/a diagram, unclipped and get about 212 ft², though I've taken a sort of mean fuselage width whereas it is obviously curved. Still, that's close enough to 200 ft² to wish for another source.

I also checked the area lost by clipping the tips and estimate about 15 ft², so that will not account for the 290 -> 200 difference.TSRL (talk) 21:18, 3 February 2009 (UTC)

The Aeroplane Monthly article I've just added - although it doesn't have a full set of specs, does confirm the length and height, with a clipped span of 25 ft 8 in, a span of 29 ft 8 in with intermediate tips and a maximum span of 33 ft 6 in with the pointy tips.Nigel Ish (talk) 22:49, 3 February 2009 (UTC)

It also gives a mximum speed at sea level for the P.111a of 648 mph.Nigel Ish (talk) 22:59, 3 February 2009 (UTC)

And from the drawings of the fully extended tips in the Aeroplane article, I make an area of about 205 sq ft. HmmmNigel Ish (talk) 23:15, 3 February 2009 (UTC)

I'd not realised that there were intermediate tips and that explains the variety of span values: Dessoutter's 1954 book also gives the span as 29.75 ft. Were there just the three configurations? I wonder how often it flew at 25' 8"; in most of the photos it looks less cropped. Saw it once, late 50s Battle of Britain show, somewhere in Cambridgeshire-ish as a surprise guest. Might have been the same show with the S.B. 5 in the static ...TSRL (talk) 23:27, 3 February 2009 (UTC)

According to British Jet Aircraft by Adrian Vickery (p104), wing area is 200 ft2.Nigel Ish (talk) 19:52, 18 March 2009 (UTC)

Finally got a copy of Brew and entered his data with detail on the three wing configurations. His areas are large but he is the authority. I still don't see how they can be that large - it is as if the fuselage has been ignored - and there is a matching problem with the root chord he quotes (17' 2.5", bigger than the g/a) but there we are.TSRL (talk) 08:57, 3 September 2009 (UTC)

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BP.111

I've removed the comment (also called BP.111), which was cn'd last May. Brew (Boulton & Paul Aicraft, Pitnam) does not say this, nor The Observers Book of Aircraft, nor The Jet Aircraft of the World (Green & Cross). All B&P projects were given a P (project) number according to Brew p.312, eg the P.82 Defiant. TSRL (talk) 13:53, 5 February 2019 (UTC)