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Thread: engine parts ID help Please

  1. #1
    Join Date
    Oct 2011
    Posts
    216

    engine parts ID help Please

    I've been going through may shed and have found these items. They've been in there for some time but I haven't got a clue what they are or what they do.
    Anyone got any ideas or leads as to what engines or aircraft they would have been fitted to. One has ROTOL details on it so I assume its something to do with propellers ??
    The first 4 pics are of the ROTOL marked item.
    The rest are of the 2nd item which has several hand marked inscriptions such as ASSY/ 602152007 or TYPE 6 0214 004? SERIAL No 62573
    Any ideas ??
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  2. #2
    Join Date
    Jan 2008
    Location
    The Wirral
    Posts
    2,594
    They are auxiliary gearboxes. Rotol made props, gearboxes and undercarriages (alongside Dowty). Usually mounted behind the (piston) engine or alongside the (jet) engine they are driven from. The four hole flange is the input drive and the shaft usually has a u/j on either end, the gearbox end u/j bolting directly to the flange.

    They seemed to be different for each aircraft type and whilst some are just interesting, it goes without saying that Spitfire ones can be worth a lot of money.

    They usually carried the generator and several pumps, the remote location allowing the accessories to be wired direct into the aircraft's systems rather than engine mounted with all the access issues and plugs, etc, this required. It also pushed the CofG back a bit on the piston fighters and kept the engine slimmer for tight cowling purposes. There were various advantages to remote-mounted accessories which added up to a useful arrangement.

    Just look at the early wartime piston engines for instance such as a Merlin in a Lancaster. It had one or two, or even three, hydraulic pumps attached to it, usually a big heavy generator and vacuum pump for instruments. Later, when the Lanc was redesigned as the Lincoln with longer engines there were hardly any accessories left on the engine, the supercharger driving a power take-off which went through to the firewall where there was an accessory gearbox mounted.

    The same for the Spits and many other larger types.

    With the advent of the jet age, the accessory gearboxes were usually mounted in the wing or fuselage alongside, with its own access arrangements so the engine wasn't affected. Someone will know what the ones you have are off. They are fairly common and most are only curiosities but keep your fingers crossed you have one of the few which are still sought after. The one in the first pic could be Griffon Spitfire (£££) but it'll need an expert or someone with access to the Dowty catalogue to i/d it for sure.

    Good Luck.

    Anon.
    Last edited by Anon; 18th May 2017 at 20:43.

  3. #3
    Join Date
    Oct 2011
    Posts
    216

    More engine parts to be cleared out

    Another item from the shed to be cleared out. Hercules carb ?
    Can anyone confirm?
    If so I think they were used Beaufighters and Stirlings
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  4. #4
    Join Date
    Mar 2013
    Posts
    124
    The first items is the main body of an Accessory Gearbox Type TG3/3 . It is just one of the many different types of gearbox design produced by Rotol Auxiliaries from 1940 under its Chief Engineer Douglas Pobjoy.

    Images 5 / 6 / 7 are of a 3-drive Type AG4/8 gearbox.

  5. #5
    Join Date
    Jan 2000
    Posts
    9,904
    No Spitfire gearboxes there sadly.

    I've probably got 100 or so of various types.

  6. #6
    Join Date
    Oct 2011
    Posts
    216
    What kind of engines would they have fitted?
    Any particular make ?

  7. #7
    Join Date
    Mar 2013
    Posts
    124
    Just about any British aircraft that required a mix of electrical generators, hydraulic pumps, pneumatic pumps, vacuum pumps. Different driving speeds were taken care of with 'twice-driven' or 'half-driven' equipment. Lots of different types of accessories used to mix and match. Used from 1940 on piston and jet aircraft, and some vintage types still use them.

  8. #8
    Join Date
    Oct 2011
    Posts
    216
    I assume the same would apply to this thingy which according to the label is a Dowty fuel pump?
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  9. #9
    Join Date
    Mar 2013
    Posts
    124
    I'm no expert on the Dowty company or products, but not really a comparable situation.

    The thing with the auxiliaries was that you could drive several pumps of different types using just a single drive source. It avoided the requirement of engine designers having to provide several different drive output locations for services.

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