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Avro Avian

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Viewing 15 posts - 481 through 495 (of 520 total)
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  • in reply to: Spot the mistake… #1075055
    Avro Avian
    Participant

    Creaking Door said:

    Was the Merlin-engined P-51 fitted with a two-stage supercharger from the outset then?

    Yes. Both Rolls Royce and North American Aviation initiated projects to convert P-51A’s from the Allison V1710 to the Merlin 66, as a proof of concept IIRC. The Rolls Royce aircraft flew first. A good book to read on this subject is the Rolls Royce Heritage Trust publication “Rolls Royce and the Mustang”. 🙂

    in reply to: Spot the mistake… #1075397
    Avro Avian
    Participant

    Myths again….

    C-D, the Alison V1710 did have a supercharger…try Wiki….

    Ah yes, the other great myth perpetuated….
    The Allison was originally designed to US military specification to be used in conjunction with a turbocharger, as there had been a lot of time and money expended on the development of turbo’s in the US. Yes, the Allison, up to and including the “F” series were built with a single stage, single speed supercharger, which by itself, limited altitude performance. The “G” series Allisons had a two stage, variable speed supercharger that solve the altitude performance problems, but was too late to be placed into mass production instead of the Packard Merlin. The Mustang had already been redesigned for the Merlin and as the “G” series Allison was a few inches longer, the Mustang would’ve required further redesign to accomodate this. Production was already underway and I believe the authorities decided to press on with the Merlin option. Author Dan Whitney has speculated what performance improvements could’ve been made if the “G” series Allison Mustang had ever been produced. The main benefit probably would’ve been better fuel consumption, leading to superior range. Dan’s book “Vee’s For Victory!” is a great read for those interested in this subject.
    Remember, of course the F-82 Twin Mustang was produced post war with this very engine.

    in reply to: News at MeierMotors GmbH / Bremgarten South Germany #1052543
    Avro Avian
    Participant

    Aren’t WW2 self sealing tanks metal surrounded by layers of rubber?
    So, what does a WW2 Spitfire wing fuel tank look like, made of? (just out of interest).

    Not necessarily metal tanks. Sure, the Spitfire main fuselage tanks were Al Alloy, covered with the “self sealing” material, but fuel tanks can/were also made out of rubber, eg the Mustang. The basic principle of a ‘self sealing’ tank is to have three layers; an inner and outer layer of fuel resistant material (synthetic rubber or metal), and a middle (sandwiched) layer that reacts to the presence of fuel, ie it swells on contact, thus blocking off any holes made by bullets, etc. Off the top of my head, I believe the wing tanks an the wartime Spitfires were rubber. What you see in Matthias’ terrific photos is relatively recent modification to put fuel cells in the gun bays to extend the two seater’s fairly woeful range – one has to remember that the front cockpit was moved forward (9″?) and consequently the fuelage tanks’ capacity was reduced.

    in reply to: Kai Tak 1994 and 2009 #1059728
    Avro Avian
    Participant

    Ah yes! China Airlines. I was told the aircraft was nearly new (it had only around 400 hours total time) and the SAS were called in to “remove” the fin with explosives so the airport could be reopened. I am also led to believe that a Cathay skipper bought the salvage rights to the aircraft and made his money back by selling the cockpit windows. The rest was profit…

    in reply to: Hawker Fury Engine Test on YouTube. #1073712
    Avro Avian
    Participant

    What a machine!:)
    Thanks for posting.

    in reply to: Merlin Crankshaft – Computer Generated Animation #1082431
    Avro Avian
    Participant

    The Merlin and Griffon firing orders are completely different.
    Merlin: 1A-6B-4A-3B-2A-5B-6A-1B-3A-4B-5A-2B
    Griffon:1A-4B-3A-2B-5A-1B-6A-3B-4A-5B-2A-6B
    Hence they sound quite different.
    Check this out for other engines. 🙂

    in reply to: Aussie Spitfire sold off to UK by the QLD govt #1042351
    Avro Avian
    Participant

    Daniel/Phil/Miggy/Sabredriver/Liberator/Historicflyer/have I missed any?/et al, please take a Bex and have a good lie down – permanently…

    There is really nothing “historic” in this airframe. It looked like a Spitfire….in the distance….

    in reply to: Aussie Spitfire sold off to UK by the QLD govt #1042453
    Avro Avian
    Participant

    ‘The book’ shows what LZ844 started life as. I have no idea what the standard of work is on the aircraft, but it is a static reconstruction based around a small part of original aircraft.

    Very different to the infamous Mk 8 export of all those years ago!

    Bruce

    I’m afraid after watching it being “rebuilt” many, many years ago, what good parts went into this project underwent “death by restoration”:(.
    I hope whoever bought this didn’t pay too much. The only good thing is that maybe something may be resurrected properly out of it.

    in reply to: How NOT to scrap an old Trident #1052377
    Avro Avian
    Participant

    All the guys standing around had hi-viz vests on – doesn’t that protect you from everything?:rolleyes:

    in reply to: Avro Avian Rebuild #1067060
    Avro Avian
    Participant

    G’Day Guys,

    I’ve just got back from New Zealand where I have been to the Classic Fighters Airshow at Omaka, Blenheim. What a show! 😀
    Anyhoo, I went to the RNZAF Museum at Wigram, Christchurch and took a bunch of photos of their Avro 626 Prefect, amongst other things, for my reference.
    http://i876.photobucket.com/albums/ab327/mightyauster/IMG_6575.jpg
    http://i876.photobucket.com/albums/ab327/mightyauster/IMG_6567.jpg
    The Avro Prefect has an Armstrong Siddeley Cheetah Mk V fitted, but the Townend Ring configuration is essentially the same as the smaller Genet Major. The ring is in two pieces, but appears to have been spun from a single piece of sheet metal to form the airfoil shape. The leading and trailing edges are beaded, the front over a tube and the rear over a wire. The two halves of the ring are held together with over centre latches. Steel brackets with felt cushions are riveted to the ring that engage with the rocker boxes on each cylinder head on the engine to keep the ring in its correct position. I hope this helps.

    Regards,

    Paul

    in reply to: Napier Lion Engines – Survivors #1080635
    Avro Avian
    Participant

    Excellent! When can we get to see a video?

    in reply to: News at MeierMotors GmbH / Bremgarten South Germany #1082074
    Avro Avian
    Participant

    Thanks for the video Matthias!

    in reply to: Avro Avian Rebuild #1116048
    Avro Avian
    Participant

    G’Day Fouga23,

    I am planning to rebuild both VH-UHC and VH-UVR. I have come accross VH-UVR almost by accident. However, I figured if I am going to build one set of wings and tail feathers, it is not much more effort (in time and money) to build two. The wings and tail are almost identical – the ribs are certainly the same and I have just finished the jigs for all the tail surfaces – to the point I hope to have the first ribs completed in the next few days. I do have enough drawings to cover both variants of fuselages and all the different engine installations.
    Here are a few photos of some of components VH-UHC…
    http://i876.photobucket.com/albums/ab327/mightyauster/AvianRHLwrMainplane.jpg
    One of the lower mainplanes…
    http://i876.photobucket.com/albums/ab327/mightyauster/AvianFlyingWires.jpg
    Set of flying wires…
    http://i876.photobucket.com/albums/ab327/mightyauster/AvianInterplaneStruts.jpg
    Set of steel Interplane Struts…
    http://i876.photobucket.com/albums/ab327/mightyauster/AvianFinRudderSpar.jpg
    Fin and Rudder Spars…
    http://i876.photobucket.com/albums/ab327/mightyauster/IMG_3907.jpg
    Main Undercarriage (with very sexy wire wheels..:D)

    I do have a box of other small steel fittings for the fuselage, but no photos to hand.

    in reply to: Avro Avian Rebuild #1116219
    Avro Avian
    Participant

    look like the internal bracing in a Tiger Moth wing

    Yes, you are right. The larger 5mm type are used in the Tiger Moth wings and I will need a few of those too, mainly for the wings in the Avian and a couple in the forward fuselage.

    in reply to: Avro Avian Rebuild #1116223
    Avro Avian
    Participant

    While I’m here, has anyone got one of these and would consider parting with it?:D
    http://i876.photobucket.com/albums/ab327/mightyauster/OilPressureGuage.jpg

Viewing 15 posts - 481 through 495 (of 520 total)