Jump to content

fv1609

Members
  • Content Count

    10,728
  • Joined

  • Days Won

    7

Posts posted by fv1609


  1. If there was a Broad Arrow/Pheon/Crow's Foot signifying Government property that was on an item that was desirable to steal it would in close proximity to the WD mark.

    But a crown on timber or metal can equally signify this ownership: "The name of Her Majesty, her predecessors, her heirs  or successors, or any public department, or any branch thereof, or the broad arrow, or a crown, or Her Majesty's arms, whether such broad arrow, crown, or arms be alone or be in combination with any such name as aforesaid, or with any letters denoting any such name."

    • Like 1

  2. 50 minutes ago, Le Prof said:

    The second one is a 'Queen's Crown'

    It is tempting to think that but I believe that is a Scottish Crown. This would fit with George VI & SCWS.

    PS Sorry I misread that, when I jumped in I thought you were referring to the first crown which looked a bit Queen like.

    • Like 1

  3. I see they have suspended selling tickets.refully monitoring the situation regarding the Covid-19 outbreak and planning the measures needed to ensure the safety of all exhibitors and visitors at the show. TICKET SALES HAVE BEEN PUT ON HOLD once we have more information from the Government we will then look at tickets going back on sale. 

    We are carefully monitoring the situation regarding the Covid-19 outbreak and planning the measures needed to ensure the safety of all exhibitors and visitors at the show. TICKET SALES HAVE BEEN PUT ON HOLD once we have more information from the Government we will then look at tickets going back on sale. 

    We are carefully monitoring the situation regarding the Covid-19 outbreak and planning the measures needed to ensure the safety of all exhibitors and visitors at the show. TICKET SALES HAVE BEEN PUT ON HOLD once we have more information from the Government we will then look at tickets going back on sale. 

    We are carefully monitoring the situation regarding the Covid-19 outbreak and planning the measures needed to ensure the safety of all exhibitors and visitors at the show. TICKET SALES HAVE BEEN PUT ON HOLD once we have more information from the Government we will then look at tickets going back on sale. 

    We are carefully monitoring the situation regarding the Covid-19 outbreak and planning the measures needed to ensure the safety of all exhibitors and visitors at the show. TICKET SALES HAVE BEEN PUT ON HOLD once we have more information from the Government we will then look at tickets going back on sale. 


  4. Mike this is from some notes I have made on the subject.

    Bridge Load Classification (STANAG 2021) Introduced 1960-63

    The bridge load classification was said to originally have represented by the rounded-up weight of the vehicle in tons. "The new system relates to the characteristics of the vehicle which includes overall weight, number of axles, distance between axles, axle load (unladen & laden), tyre size, ground clearance etc and bears no direct relationship to the former system." It must be remembered that is a STANAG, which is a NATO Standard applicable to many countries. The UK had already taken some account of factors other than weight. What changed in the U.K. was that the mechanism for calculating a figure was now standardised with other NATO countries.

    The classification of bridges was also changed to take account of the effects that particular vehicles would have on the bridge. However, the application of the system is the same as before, in that only a vehicle load class less or equal to the bridge load class number may cross the bridge. The load class number is based on vehicles travelling at normal convoy speeds at a spacing of 100 feet. The classification also relates to ferries and takes into account an assessment of the state of the approaches to the crossing to produce an overall classification.

    There was no point in UK based vehicles having a Bridge Class displayed, as the Joint Service Road Transport Regulations JSP 341 states that: The UK will not prepare classification signs for civilian bridges and ferries in UK territory in peacetime.

    1st September 1959. Originally issued as SDM(L) 219/1, Computation of Bridge, Raft, and Vehicle Classification.

    26th February 1968. Reissued at intervals until SDM(L) 219/3 cancelled and replaced by Defence Standard STANAG 2010 revised and reissued as edition No. 3.

    Def Stan 23-2 Computation and Marking of Bridge and Raft Load
    Classification Numbers for Military Vehicles

    1803409146_Load2.jpg.c44f61556f2da496750708a34c740422.jpg

    934410107_Load3.jpg.b53b93180b6d8229329b3324550bf1e0.jpg

    1763173559_Load4.jpg.1896358484af67c47caf510889af88ea.jpg

    735619108_Load5.jpg.b5100bd2415babef371c48d3b3a5441a.jpg

     


  5. 3 hours ago, Mike walburn said:

     I believe BT hat there was a ‘duty done ‘ CD , would anyone know where I may get a copy 

    Sorry Mike I don't understand what you mean. Looking for a sales catalogue without a date in mind is a needle in the haystack task. I have seen a Ruddington catalogue sell on-line for £100 so you need to be specific in the date you want.

    I have a number of these catalogues & could flick through a few to find your bike. But if you don't know when it was struck off or sold (dates are not the same) it is an overwhelming task.


  6. Dave I would have expected some sort of list like that to be somewhere in EMER POWER O that covers Vehicle Electrical Systems (Commercial Pattern) I only have the bits of Section O that cover charging systems.

    No doubt they would be listed in terms of their component parts (but not function & properties) in the Vocabulary of Army Ordnance Stores Section LV6/MT8 but again I have not collected the magneto sections.

    Looking to the RAF in AP 1086 Section 16E MT Electrical Systems there are a handful of Simms magnetos again just parts but not properties, it does at least list applications (that VAOS doesn't)

    So don't know if this helps at all.

    IMG_20200531_110519.thumb.jpg.0788e97ae6b3f94b6167693562b54e24.jpg

    • Like 2

  7. The coil may have been changed from 6v to 12v if the ballast resistor has been removed. The original clamp with its warning may have been loosened & a 12v coil slid in. A Lucas coil should have the part number & date code stamped on the base (flat bit), this will indicate if it is 6v or 12v coil.

    Maybe the ballast resistor failed & a 12v coil fitted as a temporary fix or maybe someone thought they knew better than the designers & having a 6v coil + ballast resistor was a silly complication?

    Wired with a 12v coil it will still run but the performance will not be so good at high revs because the extra inductance of a 12v coil over a 6v coil slows down the rate at which the coil can magnetise & demagnetise.

    In other words loading the primary with more resistance & less inductance reduces the time constant of the circuit.

     


  8. Wherever the resistor is located it might be as well to do some preliminary checks as it may be quite ok..

    The coil is a 16C6 & would have a resistance of about 1.5 ohms, the ballast resistor would have a similar resistance.

    With the ignition on but not started, you should get 12v on the +ve terminal of the coil.

    When you close the points this should drop to 6v. This would confirm that the ballast resistor is working.

    It looks as if the ballast resistor is short circuited on running the starter motor.

    Incidentally the ambulance UHB says that the basic electrical system is the same as fitted to the 12v GS.


  9. Please post some pictures of around the coil & of the inside of the filter box. It is very difficult to visualise your set up.

    From the title of the thread & at the outset you asked for the location of the ballast resistor, by that I assumed you had a 24v system. But perhaps this is not the case & it is 12v, in that case I wouldn't expect there to be a ballast resistor.

    Do you think all the wiring is original or maybe a previous owner has made modifications?


  10. John wow melted solder that was getting hot!

    Picking up on your point about a newly manufactured good quality condenser, I agree but it doesn't matter whether the condenser was intended for a 6v, 12v or 24v system. I just use condensers for a car (ie 12v) in 24v systems.

    It doesn't matter what the voltage is of the LT energising the coil, it is the Back EMF that comes from collapse of the magnetic field when the LT is turned off (ie points open) that counts. This is typically 300v so condensers for distributors will usually be rated for 500v although they rarely state that!

    If you see any sparks as the CB opens that is the 300v, it is not the LT supply.

    I've met a lot of people over the years who have wasted good money on "24v condensers" when a normal car one will do provided you find one of a similar size & clamp configuration.

    Because of the high ratio of secondary coil turns to primary turns, the Back EMF on the secondary is much higher than on the primary. Provided the coil is one designed for the earth system of your vehicle then this 300v will be of the correct polarity & be added to your HT.

    If you have vehicle where the earth polarity was changed & someone has just swapped over the coil LT connections then this 300v will be of the wrong polarity & detract from the overall HT output.

    Using a coil of the wrong polarity for your earth system means your HT system is 600v worse off than using the correct polarity coil.


  11. The ballast resistor is inside the filter box & that will be a few inches away from the coil, given that the screened cable is quite short.

    If you are getting sparks at the points it shows that there is continuity through the filter box & the ballast resistor is likely to be ok.

    You shouldn't really be getting sparks at the CB points, it is the job of the condenser to minimise this & maybe you have the signs of a failing condenser. This would not only show itself by allowing sparks but the spark will erode the points (think of how an arc welder works).

    The consequence of a spark is that it slows the collapse of the magnetic field of the coil thereby producing reduced HT. For maximum HT you need an abrupt switching off of the voltage to the coil & a good condenser should provide this.


  12. Sam do not buy an official B Series condenser. Even unused it will be quite old & will have deteriorated internally. Even years ago I remember people paying around £50 for the "proper condenser" an utter waste of money.

    Use any new 0.2mfd distributor condenser that will fit inside. You must use a distributor condenser as it will be rated at 500v, do not use 0.2mfd condenser other than one designed for a distributor.

    • Like 1
×
×
  • Create New...