fv1609

I suppose you lot are expecting me to sell my book that covers the making of roads from the products of the oven :shake: Oh yes they did do that in certain parts of the Empire, not so good when the rains come mind you.

Oh yes lots of stuff to sell :-D Interesting things like the civilian Champ parts book, Ferret/Humber brake adjusters, Larkspur boxes, EMERs & User Handbooks (Bedford, Champ, Humber, K9, MRA1 etc), driver training manuals, FSR, cap badges, Gen Panel No.9 & shunt box with ammeter, aircraft instruments (Magnesyns & Desyns) etc and this weeks special sale from my collection Army Manual of Sanitation 1926 just what you need for the coming show season, including a comprehensive guide to construct ovens for human solid waste, home made insect repellents & vermin paste, latrines to cater for different cultural requirements of troops from various countries, irresistible reading for the inquiring mind & for the man who is ready for anything.

Andy I think a resistance measurement is an instinctive first step people feel they want to take. But as you say there are others factors involved & I think leakage tests with a Megger type device should be an integral pointer to trouble. As you say overheating might well be a likely cause of failure & insulation breakdown is likely to be the first casualty of that. I didn't allude to that in the original article & plan to update with this sort of content as I have done with the 90A article. Apart from colour pictures I have done a lot of tests & measurement on CVR alternators which I need to share / inflict on others! With a 500v Megger readings should not be less than 2 megohms from case to, field windings, stator & PL1 with all connections paralleled. Arnie, references to field current, is only something that can be measured when fitted in the vehicle or installed in a test bench with proper oil cooling.

Arnie, the resistance of the field winding is quoted by Rotax in their technical manual & repeated in the EMER as 0.34-0.37 ohms at 20 deg C. Bearing in mind that is both the field windings which are in series. Be wary of the earlier EMER (1967) as it quotes 0.18 ohms at 20 deg C but this is per winding, so the figures are in agreement. In the article the output winding (each phase) is quoted as 0.24-0.28 ohms at 20 degs C. Rotax do not state any values but if you look in the 1970 EMER POWER W 104/12 Paragraph 7(b) it states the typical resistance of each phase as 0.026 ohms at 20 degs C. This in disagreement to what is stated in the article, however I was influenced by the 1976 Inspection Standard EMER POWER W 108/12 Part 2 that gives 0.24-0.28 ohms at 20 degs C. Of course you have to remember you cannot conveniently measure the resistance of each stator winding as they are wired in a stellate manner with each winding at one end joined to the other two & each phase comes from the other end of the three windings. So using three output connections, on any two leads you will be measuring the two windings in series, so the resistance reading is doubled. Of course measuring such low resistances without very expensive equipment is a hopeless task. The only reliable way is to pass at least 10 amps through each pair of windings & measure the voltage drop. Then by Ohms Law calculate the resistance. You could rig up a 12v battery & car ballast resistor to deliver this as described in All Charged Up 4 when it was used for testing the Gen No.10. PS The more I think about it I'm wondering if indeed the Inspection Standard figures are wrong, I'll check & see if I can find any amendments that correct this.

I've just been checking that on http://www.dstan.mod.uk Although that is a definition widely used there, it seems NSR can also mean Naval Statement of Requirement.

Naval Staff Requirement - a design specification I believe

Nothing that would interest either of us I suspect.

Will be interesting to see if we have record visits in the period 27 July - 12 August :whistle:

Well no cooked breakfast for you then Neil

Oh come on Neil don't do yourself down. You managed to talk you wife into letting you have a Russian tank, a Stalwart & a Rover, I'm sure there's plenty of commission for you selling MVs to people who want to buy them:D

That's if you apply for the secretarial job Richard, there are two jobs, the other is a meeting the public face to face :undecided:. But yes I know you'd sooner be under the vehicle doing things than talking about it:laugh: So is anyone going to contact Camilla?

I know no shame Mark, just teasing the Champ owners in case they outnumber us this time:D

Couldn't find them in my Clothing Regs 1955. But something I hadn't seen before Trousers, dreadnought Sorry don't want to hijack your thread but whilst we are into trousers what are Trousers, dreadnought? They sound a rather formidable garment.

Paul, Neil & others, well done on building up the show & achieving the National Show status. At one of the earliest shows you ran there I remember an old boy with a Champ saying, "This will grow & will become the new Kemble" Too far to bring the Pig or Shorland so I'll just have to come in a Land Rover. I'm especially interested in what sort of Champ turn out there will be for their anniversary.

Maybe it adds to the mystique like not using your name or maybe in the profile section it is inaccessible because there is an advert that blocks the bottom of the page?

You need to look out for JSP 361/3

Harry I had forgotten about that thread. I'll have look & see if I saved the images. My recollection is that there was some sort of power unit connected via a cable to a monocular. My recollection is also that a post seems to have been withdrawn. ISTR that someone made a post in the form of a warning that I had been putting out duff information. They felt that it was important to alert others with a public warning & backed it up by the fact they had handled some surplus Tabby equipment themselves. You can see how the posts don't really flow with the post/posts gone. That is why one of my replies started "I stand by what I said in..." & then I quoted a list of documents that were on IR, not to show off, but my integrity was being challenged & I needed to show my sources of reference & my experience with the history of early IR systems. PS I have just looked but no pictures. All I found was a Type F & power unit from e bay. I think once an item is sold on e bay you cannot view it unless you have book marked it earlier or bought it!

Harry that is a very interesting link on several counts. For years I have been trying to accumulate a list of RN publications & have relatively few examples. There are many BR publications on that list, BR meaning Books of Reference, some of these are confidential/classified some are not because they were a reclassification of the earlier system. The three levels of security were: OU = Official Use CB = Confidential Book SP = Signed Publication The book for RG Receivers was from CB04222. I see it is dated 1943 although I always understood the change to Books of Reference at least started in 1942. So it would be wonderful to get hold of a copy. I'm surprised it was CB security level I would have thought it would have been higher as SP. I'm tempted to believe you have & what I have known of but never seen a Type C. X I assume is an experimental one or in some electronic items indicates it is pan-climatic. Since the late 1920s it was the Admiralty that did the research into IR, initially not for vision, but for signalling & beacons etc I have a genuine wartime document that lists the organisations together with the people involved in RG Equipment together with their telephone numbers and it is the Ministry of Supply of course as the overseeing body but it is the Admiralty Research Laboratory that heads the research not the Army or RAF. The Department heads were Drs Hill & Elliott on Molesey 1380 together with Mr Jackson on the same number but Extension 146. I found the info below from newspaper cuttings taken a year or two after the war. The first record of operational use by any of the services was in the Mediterranean in 1941, when Commandos, equipped with infra-red signalling sets, maintained contact with parent ships offshore. In September 1943 midget submarines attacked the German battleship Tirpitz, using infra-red equipment, and again when they cut the submarine cables at Hong Kong and Saigon.

Harry the image you see has no red in it, it is green in varying degrees of lightness. Just depends on the properties of the cathode screen as electronics strike it. Despite all the secret code words, the stores cataloguing gives a clue as to which service used which device. I believe yours was a naval version as A.P. is Admiralty Pattern & section W covers radio, radar, sonar & electronic things like that. Similarly Tabby Type F was RAF as it uses the stores prefix 5C & similarly Type E was Army with the ZA stores prefix.

Harry my guess is that your monocular is a forerunner of Type K. They are all Tabby as a general code name, prior to this it was referred to as RG Equipment, this seemed to change in 1943. I saw your link with a reference to it as Red-Green Equipment which I don't understand. I assumed it was Red Glass Equipment for indeed the filters are of red glass. Yes the rubber face mask on the binoculars is very prone to rot. Mine is in good condition & still has the MoS label. I have a number of spare image converter tubes.

Harry that is in super condition I have never seen a bakelite version. I just have a standard Type K & Type E (still working) & may still have a bit of Type F. The photos are very good giving a nice overview on its construction. A while ago I did a Tabby article http://www.hmvf.co.uk/pdf/Tabby01.pdf & other systems in subsequent articles. There was a Type E on e bay last week that sold for something like £130 I think. Do you have any more Tabby items to share? Your English is fine:-)

Richard Farrant can't get in, he keeps getting a DNS server error. Is it a geographical thing depending which servers you go through locally? I've made two posts since switch over but when I go to post I get a DNS server error warning. It gives me the option to try again & that then works. PS No problem that time

This is one side panel of my Shorland turret, each main piece has its own stamp mark. Contrary to what some sources state, these are not Ferret turrets but were specially manufactured for the Shorland. I wonder if the top two lines mean anything in engineering or armament terms? 551410-1 must be a manufacturer's part number as it is very close to the number for the complete turret. At the time Shorlands were not made by Shorts but by Short Bros & Harland Ltd. I imagine perhaps HLD is a contraction for Harland as it was perhaps made in the shipyard. The chassis is dated November 1965 so it looks as if the turret was made in that year as well. Most of the armour of these Mark I vehicles have a thickness of 7.25 cm & 363 Brinell Hardness. But I can't see anything to tie in with the top two lines. Unless BM172 54-33 includes 725 mm in there?

All fine here. Many thanks. Nearly thought I might have to watch television