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irmurray

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Viewing 15 posts - 1 through 15 (of 29 total)
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  • irmurray
    Participant

    A further thought towards making an approximation to structure weight:
    Structure weight = empty weight – (weight x number of engines) – (weight x number of seats)

    Presumably engine weights are published, and a standard weight could be used for all seats?

    Is there anything else substantial that should be deducted from the empty weight to get structure weight only? Older aircraft tend to have removable fuel tanks, whereas more modern aircraft have the tanks as part of the structure, so not sure how to handle that.

    Thanks for any comments on these.

    Iain.

    irmurray
    Participant

    Iain, perhaps an email to Boeing and/or Airbus might be fruitful. I have no compunction asking questions like that, they can only say yay or nay. I will ask them for you.

    That would be kind, thanks. The only online contacts for both are the press office/media centre and I have e-mailed at least one of these in the past and got no response, not even a yay or nay.

    I thought Boeing would have been keen to push the 787 being the lightest strongest airframe (if such it is) as they made so much of the composite construction.

    The comparative sizes between the aircraft is not important, I just want to compare the percentage of weight as structure within each aircraft – is the structural weight percentage getting larger (with size) as theory suggests, or getting less, as the use of more composite would suggest?

    Thanks again,

    Iain.

    irmurray
    Participant

    Thanks for your reply.

    Approximation is really what I’m wanting to avoid – unless you can give a reasonable formula for making the approximation!

    One aspect I want to get to is the effect that the increasing use of composites has had on structural weights. Presumably they are used to save weight, but how much is that saving? As other weights are published, why not structural weight – it wouldn’t be commercially confidential, would it?

    Consider a 757-300 and 787, which are roughly the same size:
    757-300 MTO = 272,000, empty = 142,000, so can carry 92% of its empty weight
    787 MTO = 502,000, empty = 242,000, so can carry 107% of its empty weight
    Presumably that is due to a combination of more powerful engines and lighter structure … but in what proportion? Very tricky to guess!

    Thanks,

    Iain.

    in reply to: Stephen Fry and THAT film remake #1055344
    irmurray
    Participant

    That is interesting because in the 1954 radio version made by Australasian Radio on the other side of the world, a year before, the actor that they cast as Wallis sounds exactly like Redgrave did in the film. I assumed that both had based the voice on the real chap.

    I heard both Richard Todd and Wallis son speak at an event in 2008, and they both admitted that Redgrave was good, but spoke much faster than the real Wallis, as if he hadn’t, the film would have been much longer! Wallis always spoke in a steady, measured way.

    Redgrave followed him about for a few days in 1954 (literally in his footsteps at times) to learn his mannerisms.

    Neither Todd nor Barnes Junior were impressed at the thought of a remake.

    Let’s face it, the film is pretty good apart from the SFX (which were up for an award in their day), so why not just remake the SFX and cut it into the original film? Lucas did that with the Star Wars re-releases!

    The Australian radio programme is excellent and follows the Squadron through to the end of the war … but even for the die-hard listener, it’s a LONG 13 hours!

    Regards,

    Iain.

    in reply to: Crecy/Wellington 75th #1064103
    irmurray
    Participant

    The Brooklands Museum event marked the 75th anniversary of the Wellington with the opening of a new exhibit at the museum, with new interpretation boards about the aircraft, and in particular the example they have N2980 “R for Robert” aka the Loch Ness Wellington.

    After opening speeches by Allan Winn (Director of the museum), Norman Parker (who worked on Wellingtons during the war), Ken Wallis (who flew in Wellingtons during the war and later became famous for his autogyros) and Robin Holmes (who masterminded the recovery of N2980), the exhibition was formally opened by Penelope Keith, who is a trustee of the museum. There was then a “taxi run” demonstration by a large model Wellington outside the hanger. In the afternoon, Norman Parker gave an excellent presentation on the Wellington’s history and construction.

    The photo below shows the principal guests at the event, including Norman Parker (head just below left-hand board), Ken Wallis (moustache and beard), Robin Holmes (pink sweater) and Penelope Keith (far right).

    http://www.computing.dundee.ac.uk/staff/irmurray/pictures/Brooklands15June2011.jpg

    Congratulations to all at Brooklands Museum for organising this event to mark this significant aviation anniversary.

    Iain Murray.

    in reply to: 617 diorama, need help with… #222427
    irmurray
    Participant

    The Avro plans show the trolley as a modified Type E, with two rectangular bars (wooden I’d guess) added on the top (parallel to the wheel axles) atop which sat the Upkeep (also axis parallel to the wheel axles). There is a copy of this in Cooper’s “The Men Who Breached the Dams”.

    Does anyone have a photo of a Type E trolley? I’ve found some Type F trolley images but it appears to differ from the plans of the type E in several respects.

    Many thanks,

    Iain.

    in reply to: Which Avro Lancaster Windows Were Painted Over? #1132048
    irmurray
    Participant

    But I would have thought that any hardware for the dams missions would have been removed/altered after Chastise, in preparation for the Tallboy and Grand Slam missions the following year, and Tiger Force in 1945…

    Although some of the Lancasters were converted back and flown on operations (though none were fitted to carry Tallboy or Grand Slam), some were kept in storage in their original configuration pending possible further use of the weapon (which was seriously considered, though never implemented). Some of these aircraft (including Gibson’s ED932) were available for the dumping of the unused HE-filled Upkeeps in 1945 and 1946. The dumping was done from Scampton, though the aircraft were flown down from Lossiemouth for the purpose.

    Regards,

    Iain.

    in reply to: Which Avro Lancaster Windows Were Painted Over? #1132366
    irmurray
    Participant

    The presence of the Quarrywood dump sites is quite fascinating. Latterly, the remaining Type 464 Lancasters used on the Dams Raid were in storage at Lossiemouth, so I wonder if any of them (and their treasures) are to be found in there? None of the Dams Raid hardware exists anywhere else, so this would be a fabulous find!

    I had always assumed that the windows were put in to make navigation along the inside of the dark fuselage a bit easier for the crew … but maybe presented too much of a hazard if light from inside caught the eye of a nighfighter?

    Regards,

    Iain.

    in reply to: Barnes Wallis statue unveiled – 15 Nov 2008 #1179822
    irmurray
    Participant

    Hi, thanks for this extra information on the statue.

    organised by local businessmen after the local council refused to help

    Was a local business organisation behind it, or was it just a group of individuals? Presumably it must have been a recognised group to qualify for lottery funding?

    The Wallis family were told, his brother was unable to travel at the last moment.

    I presume you mean his son, who lived in Kent. Sadly he passed away in July, and his two sisters knew nothing about the statue.

    Thanks again for this info.

    Regards,

    Iain.

    in reply to: Barnes Wallis statue unveiled – 15 Nov 2008 #1214242
    irmurray
    Participant

    2. & 3. pieces of the structure of R.100?? these weren’t actually labelled but were on top of the case with the large model in. The propellor standing to the left of pic 3. is labelled “R101”

    The girder structure with the circular elements is very distinctive of R.101, from the photos I’ve seen … R.100 girders would have had straight elements between the thicker members. The proof test would be that the heavier members are stainless steel, the circular bits duralumin (R.100 girders were entirely made from Duralumin, one reason she wasn’t so heavy!)

    Regards,

    Iain.

    in reply to: Barnes Wallis statue unveiled – 15 Nov 2008 #1215539
    irmurray
    Participant

    In the Q&A after John’s presentation, one point raised by an attendee was the apparent poor condition of Wallis’s grave at St Lawrence’s Church in Effingham, Surrey. Can any locally-based forumite give any details?

    I am advised by a contact at Brooklands that the grave is in a satisfactory condition (no more mess than autumn leaves and a few weeds), and that someone from Brooklands does check on it from time to time.

    Regards,

    Iain.

    in reply to: Barnes Wallis statue unveiled – 15 Nov 2008 #1216535
    irmurray
    Participant

    What about Howden nr Goole where the R100 (the finest airship ever designed/built in my opinion)was constructed and flown ,surely a memorial Statue/Plaque should be considered by the local council at least i think there is a pub named after him there ,also do any parts of the R100 still exsist?

    Howden would be appropriate (also home to the BW Memorial Trust) but the site itself is out in the country, so would not be seen by anyone unless placed at the side of a country road. Most of the actual airship station site is now a golf course.
    The BW Memorial Trust has at least one section of R.100 girder, and also some wood panelling from the passenger accommodation. These were on display at YAM at Elvington, but the BWMT exhibition is now closed there and is unlikely to re-open at YAM, I understand. A 3ft section of R.100 came up on eBay a couple of years ago and sold for just shy of £1000.

    Iain.

    in reply to: Barnes Wallis statue unveiled – 15 Nov 2008 #1216671
    irmurray
    Participant

    Bouncing Betty? 😮 Surely she was the WAAF that drove the bomb train?
    Moggy

    I’ve been researching Wallis for years, and have NEVER seen the term “Bouncing Betty” before – did they make this up?
    “Nidge” similarly, even though David Frost claims Gibson did use this name for his dog …

    Iain.

    in reply to: Dambusters Film – Painting on Wallis's Office Wall #1194106
    irmurray
    Participant

    Are there any more original models of Swallow around?
    I know of the one at Elvington and the one shown in this thread is, I presume, in Hendon?

    This one is indeed at Hendon. The RAF Museum has three others in storage at Stafford, including the large famous one often seen in photos with Wallis (and the one in Swallow2.JPG above).

    I’m not aware that there was a Swallow model at Elvington – there were plans on display and a model of Wild Goose. The Elvington display is now closed and is unlikely to re-open there due to problems between the BWMT and the museum management.

    I ask this as there will soon be a resin model.

    “Soon” may be the wrong word – this site has been displaying this model pattern picture for over a year now!

    Regards,

    Iain.

    in reply to: Dambusters Film – Painting on Wallis's Office Wall #1194769
    irmurray
    Participant

    When Gibson visits Wallis’s office for their initial meeting there is a rather, some might say “futuristic” for the time, painting of a needle nosed aircraft of some sort on the wall near the door.
    Does anyone have any idea what it might be?

    It’s actually the pointed tail of R.100, the huge airship which Wallis designed in the 1920s – the covering is in progress and tail fins are not yet covered. Attached is a recent photo taken of “Wallis’s office” at the RAF Museum (Hendon) which has this picture over in the corner – try comparing with the movie!

    I believe the aircraft mentioned is a Swallow, a design for a variable-geometry airliner

    By chance, the white model in front of the R.100 painting is of the Swallow – this wasn’t designed until the early 50s, but (a different model of Swallow) is often seen in archive shots of Wallis at his desk.

    any insight as to how the new Dambusters movie, penned by Stephen Fry, is coming along?

    About a month ago he was working on the final draft of the script … the original timescale seems to have slipped a bit, with release now not likely before 2010 – maybe even 2011.

    Hope this is helpful.

    Regards,

    Iain.

Viewing 15 posts - 1 through 15 (of 29 total)