Jump to content

David Herbert

Members
  • Content Count

    632
  • Joined

  • Last visited

  • Days Won

    4

David Herbert last won the day on June 19

David Herbert had the most liked content!

Community Reputation

18 Good

About David Herbert

  • Rank
    Lieutenant
  • Birthday 04/02/1954

Personal Information

  • Location
    Ayrshire, Scotland. previously Suffolk
  • Interests
    Heavy armour, plant, narrow gauge railways.
  • Occupation
    Retired engineer / odd job man

Recent Profile Visitors

The recent visitors block is disabled and is not being shown to other users.

  1. David Herbert

    Morris C8

    Jon, I wondered how long it would be before you spotted it ! Simon, Are there not bolts (1/4" or 5/16") through the bottom ends of the hoops and the pockets they locate in? David
  2. David Herbert

    Voltage Regulators Period Correct or (gasp) Modernised?

    My feeling is that these were pretty reliable technology untill alternators came along and as long as they are set up right and not corroded inside should be fit and forget items. Certainly setting them up is often seen as a black art but if you follow the instructions to the letter they will work, often for the life of the vehicle. David
  3. David Herbert

    Morris C8

    Simon, I think that the idea of the long hoops and extension pieces for the canvas was that you could have more headroom within the truck if you were not needing to be very mobile. The centre hoop could not be lengthened as it would overlap the wheel arch opening. Certainly you could use it as a tent (and there are photos of that being done with 8cwt tilts) but the radio instalation is very much built into the 15cwts and would then not be protected from the weather. This is a purpose built radio truck, not a GS truck with a radio. If the tilt were raised as I suggest the wooden planks that tie the hoops together would be useful in preventing the tilt blowing inwards . David
  4. David Herbert

    Morris C8

    Hi Sigve, Your truck is amazing, my first MV was a Bedford MWR which I bought 48 years ago and was not remotely in as good a condition or as complete as yours. David
  5. David Herbert

    Morris C8

    Hi Sigve, Is this truck in the condition it came out of the military or was it restored, say 30 years ago, and then left in the barn to mature ? Which ever it is, it is in remarkably good and complete condition, a great find ! David
  6. David Herbert

    1914 Dennis Lorry

    Looks great but if it rains, any rain stopped by the windscreen runs down it onto your feet ! I am glad things have moved on ! David
  7. David Herbert

    Rolls Royce Armoured Car

    I think we just have an issue of how the dimension is shown on Rania's drawing. It shows measuring from the studs at 10 to 2 o'clock. Continuing the LH dimension line down to the 8 o'clock stud changes nothing as it is directly below the 10 o'clock one. If one wanted to show the dimension from the 12 to 6 o'clock studs one would take the dimension lines out horizontaly and then mark the vertical distance between them. If one wanted to show the distance between the 8 and 2 o'clock ones one would draw the dimension lines at 30 degrees to the left of vertical and mark the distance between them. Alternatively one could just say that the centres of the studs are on a circle (known as the pitch circle) of whatever diameter, which would apply regardless of how many studs there are. The explanation of measuring odd number studs in the left image above might serve if you were roughly comparing wheels but it would be idiotic to use it to specify what you need as it is very inaccurate. How inaccurate depends on if there are 3 / 5 / 7 etc studs but that is not mentioned. It is just wrong !! And they are not always in inches either, nor round numbers !! Grrr... David
  8. David Herbert

    Rolls Royce Armoured Car

    Rania, Just to be clear, in your drawing above, does the 'D' dimension refer to the pitch diameter of the wheel studs (in which case it would be the distance between opposite ones), or does it refer to the distance as shown, from one to the next but one ? It is much more conventional to specify the diameter of the circle that the studs are on, ie from one stud to the one furthest from it, ie directly opposite it. If you are going to modify wheels to fit your hubs you will need to measure both the pitch circle and the diameter of the hub that locates the wheel rather more accurately than you can with a tape measure ! Sorry to be pedantic ! David
  9. David Herbert

    Loyd TS&C T69261

    You need a CAD system (Cardboard Aided Design) ! David
  10. David Herbert

    Rolls Royce Armoured Car

    I think that the plain (front) wheels look better than the rears. If the two rows of wheel studs offend you why not cut out the centres and weld in a new centre with just the six stud holes that you need. you can fill the two holes in the RH front wheel at the same time. David
  11. David Herbert

    Rolls Royce Armoured Car

    That front axle was clearly fitted with brakes but they have been unbolted from the stub axle, the flange remains. David
  12. David Herbert

    Rolls Royce Armoured Car

    I bet that gets some look on the road ! Looks to be a very professional build, much better than most film vehicles. I would have thought that a H registration Bedford van would be a CF and they had independent front suspension and I don't think that six cylinder engines were offered but it is possible that ambulances or police vans were offered with sixes. It should be possible to find the engine number and from that the original application. Similarly there may be a chassis number stamped into the chassis (possibly the front third of the outer face of the LH chassis rail) which would tell you what that came from. I would suspect a 7.5 ton TK light truck. David
  13. David Herbert

    WW1 Peerless lorry restoration

    If you know a dairy farmer it is worth talking to them about the product used to remove calcium deposits from inside the milking machinery. This is actually phosphoric acid and as purchaced is strong enough to fizz if a tiny amount is spilt on concrete. The instructions warn that it will burn on contact with the skin and tell the user to dilute it 200 : 1 and circulate it through the system for ten mins after milking while the system is still hot. Then flush with clean water. Phosphoric acid is almost ideal as a rust inhibitor as it converts rust to ferrous phosphate which is stable and is the active ingredient in rust inhibiting primers like Bondaprimer. It is not a good idea to inhale it or get it on your skin but good ventilation and rubber gloves and a good supply of clean water in case of spills should avoid most problems. I have not used it to treat items that have been in molasses but have used it on sand blasted items with great success. I would suggest that this is the ideal way to stop the almost instant rusting that occurs after de-rusting with molasses. As I said, phosphoric acid CONVERTS rust to ferrous phosphate but does not remove any amount of it, you need molasses or blasting for that first. David
  14. David Herbert

    Panzer 2 turret

    I think that a CVRT transmission would be ideal if it can be fitted into the shape of the hull. CVRT final drives might solve that problem too. Good decission to use the Jag engine. It will sound right and fits nicely. David
  15. David Herbert

    Defence Service Eye Spacing

    Thank you John for challenging my memory of events 42 years ago ! I certainly never saw a STANAG or anything resembling a specification for the eyes. However that is not evidence that there wasn't one so if John is certain that there was an actual standard of design details rather than recovery assesment tests that had to be passed (functional tests) after the pilot vehicles were submitted to the MOD then I think that the explanation must be as follows. I was asked to design the front bumper , initially for the 6x6 limber vehicle. I had had quite a bit of experience with off road vehicles and was convinced that the conventional one piece bumper was too easily damaged, usually by just one end being bent. Also the range of vehicles that were being considered would need variations to the bumper that could be accomodated if a modular design with seperate sections inside and outside the width of the chassis were used. If the connection to the chassis was made big enough there would be no need for a brace from the end of the bumper back to the chassis and the centre section would form a massive cross member, stiffening up the front of the chassis. This concept was aproved and while drawing it up it became clear that a seperate flat plate incorperating lifting / recovery eyes could be sandwidged between the outer bumpers and the chassis. This could easily be adapted to different needs and would be simple to replace if damaged. Again this was aproved and I drew up what I thought was suitable and it was aproved (by my boss) unaltered. It is possible that my boss had a specification for the eyes and had not shown me because I was only supposed to be designing the bumper but I never saw it. I am sorry that this is not as clear cut as my original answer but I have great respect for John's views and as he says we need someone to find a copy of the STANAG . It will be interesting to see its date and detail level.
×