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Topdog

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  1. The Saladin requires a breech lifting frame which attaches to the inside of the turret in order to remove the barrel.  Does anyone have one that I can borrow, buy or copy.

    Also, any info on barrel removal would  be most useful.

    Many thanks

    David

  2. Its like being handed a smart phone having never had a mobile before.

    Unfortunately, my default position is not to spend hours playing with it to try and get it to work.

    Shame really as I don't know of a similar forum where I can transfer to but this is the hardest forum to make work out of the few that I use for various hobbies.

     

    • Like 1
  3. On ‎16‎/‎10‎/‎2017 at 12:04 AM, Lauren Child said:

    Have you spotted the "condensed" button - it makes it easier to scroll through and pick out the interesting posts.

    Nope not found that button at all.  I can only ask that question by pressing the quote button.  If someone would like to pm that would be great as I doubt that I will find this again otherwise.

    David

    • Like 1
  4. I'm trying to find this type of torch used by the Brits during WWII. I don't know much about them to be honest but would like one in the collection.

     

    Any help appreciated,

    Neil.

     

    FB_IMG_1504029821169.jpg

     

    Blast blast blast............

    I threw one of those out a while ago, not knowing what it was. Sorry.

  5. Aircraft are negative earth. please be careful with the ignition system it will kill you if you make a mistake.

     

    always leave it 30 minutes after you remove power before you touch any part of the ignition system especially the igniter lead.

     

    The box should have a internally resistors which bleed the 40,00 volts to earth . Its not like a car coil pack this is designed to work at altitude so the spark is very meaty.

     

    Thanks mate - GOT IT - I will be very careful. Should I ground spike it when running?

  6. It sounds like this generator maybe a Dynastart type which has the ability to be used as a starter then once running be a generator. I believe some small gas turbines use this system.

     

    Thanks Richard. It should be fitted with a starter generator but I suspect that my item is not the proper one for it.

  7. That generator is a 3 phase 120 vac 400hz generator.

    I doubt it will be what you want.

    Typically a gas turbine engine with a starter/generator sytem is DC 28 volts.

    The generator has a controll box that allows it start the engine then when a specific speed is reached it becomes a generator.

     

    Thanks lowfat.

    It states single phase on the plate. Will it run if I stick mains current into it?

  8. I have no way to spin the genny at speed to see if it produces current. Each pair of contact shows continuity and does not carry across to other pair. There is no reading on an analog meter for anything (volts, amps, DC, AC) if I spin by hand.

    The next thing to try is some sort of bodge to spin higher speed which might involve an electric drill or lathe - probably not a good idea.......

    or just to shoot some current into it starting with 24v and then 240v and have gloves on and fire extinguisher nearby.

  9. I would post pics if I could remember how to do it Andy.

    Its a Garrett GTCP-30-92C. Kind of looks like an overgrown turbo from a car ie round snail type engine rather than long straight through flow.

    The generator is marked Lucas Aerospace Air Cooled A.C.Generator but the fitting and splined shaft is an exact fit for the engine and I was given it by the engineer who I got the engine from as a generator that I might get to work as a starter as he did not have a proper starter for it.

  10. I have bought a small gas turbine apu just to run up for giggles but in place of the starter there is a generator. I want to know if I feed this electricity will it turn?

     

    I cant remember how to post a photo but there are 4 terminals which are two obvious pairs and the data plate shows

     

    Rating-----Ground----------Flight

    KW---------2.2--------------4.4

    volts rms----83--------------115

    Phase------single----------single

    HZ----------192----------220/400

    RPM-----min 5760-----6600/12000

     

    Any help much appreciated as the fitting and drive pinion is correct for the turbine.

     

    On another point, is the ignitor box critical on polarity? The feed is 24v but I have no way of telling which is pos and which is neg apart from one runs to ground - but I don't know if an aeroplane (HS125) is pos or neg earth and I don't want to blow the box by getting it wrong.

     

    Many thanks

    Dave

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