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Posts posted by JohnD

  1. Who was Ackermann - he of the cunning linkage that ensures a tighter turn for the inner wheel when cornering?

    You may not want to know but I'm going to tell you.   Because I've acquired a book about his great, great, great grandson, Eric, who was a leading scientist in the development of radar in WW2, and it outlines Grandpa's story.

    Rudolph Ackermann was born in  Saxony about 1784.   He served an apprenticeship to his father a saddlemaker, but then moved to Leipzig, then Basle, then  Paris, working as a carriage designer.  Ah!  The link with suspensions!    But then he moved to London and became a printer and publisher!  A man of many parts!   His company became leading art dealers, and until recently was still trading in Central London.


    Rudolph Ackermann, 1812.

  2. Many chemicals are used to remove rust, such as acids, strong to weak, and more expensive proprietary liquids like 'Evaporust'.    But I was idly surfing the 'Net this evening and came across advice on a gun channel (!) that boiling a rusty item in plain water was helpful!      This was accompanied by pictures that showed a very rusty gun changing, as the red rust turned black.

    This change wasn't explained, but I wonder if this is due to the various oxides of iron that can occur.     We are used to a highly oxidised form that is found as the mineral haematite, red in colour, Fe2O3,.    The iron has lost three electrons, and can combine with several oxygens.       Boiling water will drive out any dissolved gases, so will be anoxic.     Does this, and the temperature, force a rearrangement in the oxidised iron so that it forms a 'lesser' oxide, such as Ferric, FeO, which is black?

    True blueing converts red rust into magnetite, Fe3O4, a higher  oxide, and originally was done by boiling in a strong alkali solution, but I can't see this happening in just boiling water.   Does anyone from the Chemistry Dept. at Sideways University know?

    It would be barely possible to boil a car! But this technique may be helpful for smaller parts, I'll remember it next time I have some saucepan sized item to clean !


  3. You've seen "Le Mans '66/Ford vs. Ferrari".   You've seen "Le Mans" and "Grand Prix".   You may even have been able to sit through "Days of Thunder".    Now you will be able to see the movie that Steve McQueen was 'robbed' of, or at least what was left of it after Warner Brothers pulled the plug on the project in 1965.     A historian has dug the preliminary footage out and made it into a film, "The Day of the Champion: The Lost Movie" that will be shown on the Sky Documentary channel.

    MotorSport magazine has such an extensive and detailed article about the film that you hardly need see it, if it weren't for the stills that it includes from the film.   They include in-car footage over the shoulder of Stirling Moss, no less, as he 'raced' some Loti around the Nurburgring.   Unmissable!

    https://www.motorsportmagazine.com/archive/article/february-2021/72/steve-mcqueens-lost-f1-movie-day-of-the-champion?utm_campaign=2322573_ED_GR - 090822 - McQueen&utm_medium=email&utm_source=emailCampaign&dm_i=4DIP,1DS3X,49SMYJ,6E7WB,1


    If you can't wait, go to the MotorSport webpage and click on the line of page images below the first paragraph.   Click on the first, and then page  through the  article, and see the stills in perfect resolution!

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  4. That auction has ended, and I think I was right not to pursue those rather attractive lots!

    The two precision levels went for £85.

    The two giant micrometers went for £180.    Still cheap, I think, but a lot more than I would spend on a unique wall decoration!

    And the collection of bore gauges were knocked down for as little as £1080!     That's a tenth of their cost new, so probably a bargain for somebody, lets hope an engineer, not a set designer!


  5. 22 hours ago, JohnD said:

    Well, you can spray water to a running engines intake, some use it for carbon removal.   But if that U-tube is about 50cms long with a bore of 1cm, that's 50mls of water that could be launched into one intake all in one lump!     

    I suppose that hydraulically, oil would be just as bad as water.     We add oil freely for, say, compression testing, but 50mls is about 10 teapoonfuls!


    Eh?  I completely forget about Pi r^2, and no one corrects me?   That's not like you all!    50cms and a 1cm bore, that's 50xPi mls= 157mls to dump into the engine!

  6. Yes, indeed, Phil, Project Binky used their digital level that "made the noise" with pride, repeatedly showing the precision of their work! I need to be able to show that the two cams are raised, one going up, one going down, and level.  The top of the block or head won't be horizontal, it slopes back, but if they are parallel to that, they are level!  The 'zero' button can fix that!

    Maybe, in good Project Binky style, a bracket to hold the Level Box on the rockers?



  7. I think I would have cut the filters, and reglued them to a shape that cleared the bulkhead!

    I had to cut the  bulkhead to fit the Lucas Pi Metering unit to the Vitesse, with the engine moved back a tad, but when I enlarged the plenum tube and that fouled the bulkhead the other side, I trimmed the plenum tube

    Anyway, foam filters inside the engine compartment, behind the radiator, feed hot air to the engine.  Suggest you build an airbox to contain them that is fed from  in front of the radiator!


  8. Well, you can spray water to a running engines intake, some use it for carbon removal.   But if that U-tube is about 50cms long with a bore of 1cm, that's 50mls of water that could be launched into one intake all in one lump!     

    I suppose that hydraulically, oil would be just as bad as water.     We add oil freely for, say, compression testing, but 50mls is about 10 teapoonfuls!


  9. Just to give you an update, less than 24 hours before the end of this auction, the large micrometer with other odd tools has been bid up to £20

    But another lot, of large and VERY large micrometers has got up to £30, which given that they are both still in their boxes with accessories, may be a long way from where the final bid rests.

    2 very large micrometers each including its own case - Image 1 of 9

    The collection of bore gauges is now at £110 and since there are more than 25 instruments in the lot even that seems quite a bargain.    Since a tri bore gauge, new, is at least £300, that too may rise further.     But I shall resist temptation, since I have little need for such sophisticated precision gear!

    More remarkably is a lot of two "precision levels", which have reached £45.      I was tempted, as the weakness of the new ELoO  method I reported earlier lay in the tiny spirit level in my adjustable set square.   One of them looks like this:

    2 off precision levels each in their own case/box - Image 2 of 4

    As I have a real use for such a tool - instrument! - I am tempted to pursue it, but the above resembles a Starret level I find new on sale at£350!  So probably this will go for a lot more.

    Has anyone experience of digital levels?  Either in the form of a spirit level, or a "Level Box", like this, that you can buy new for about £20.   


    They typically claim a resolution of 0.1 degrees, which has to be better than eyeing a bubble.   The question might be the slope of the cam as the two valves open and close together.  What would the effect be of 0.1 degree on levelling the two lifters?   How far from truly level at TDC, so that the cam was correctly set?   Have to think about that, and look at my cam measuring data, to see if I can work that out.




  10. New and global  scams continue to appear.   This one was headed "Order Update # 625022 "   That number rings a bell for me but I can't  recall or find what it means

    It was allelegedly sent by "Royal Mail" but  my mailbox appends the senders address as "<royal.mail.service@ebiki.co.jp>"     www.ebiki.co is the name of a long established small firm that makes soy sauce and other condiments, in Japan, so I really, really don't think they will have the Post Office's contract for mail registration.

    It looks like this:


    No, I haven't clicked on the number starting "JK", which is highlighted and is very obviously a hyperlink, to "http://estarbizadvisor.com/tblstatus/6/index.php?www.royalmail.services"   EStar Business Advisors are company Accountants in Singapore, whose probity is unknown, but again are unlikely to be contractors to the Post Office.

    Binned, and suggest you do too!

    Are these reports of any interest, or useful as warning?   Or are you all just  savvy to the scammers'?



  11. If that didn't have the neatly printed "Instructions for Use" on the card, I would have thought it was a very good DiY effort!    Even the clamps holding the U-tube to the card are straight out of the Central Heating installers' spares box, for holding  ?15mm? pipe.     An example for copying?   So simple!

    I guess it might be a foot high, or  bit more?     And I wondered what liquid would be used, not water, until I read the IfU saying, "RedeX"!   That might be hard to find these days - perhaps a light oil like 3-in-1?

    And the round block - does it completely plug the intake, or is there a fixed gap, so that like Nick's device above, it measure a pressure  differential?

  12. Surely for a short flight (eg Dublin-London) and a short stay, the answer is to wear ALL your clothes at once?!

    Four days underwear, four tops, socks etc.    Carry it all in a plastic bag, get into them in the airport loos, and remove in same when you arrive.     Overcoat/anorak on top with pockets big enough for all 'toilet' articles.     Who needs luggage?


    Woman avoids $85 overweight baggage fee by wearing 9 pounds of clothing on  plane - ABC30 Fresno

  13. Nick,

    I haven't but if you wanted to apply Holzer Analysis to the Spitfire crank, you're welcome to a copy of my dissertation, in which I described the process.

    Holzer was, is, an enormously protracted, iterative calculation  so that it fell out of favour, but today once you have set up your spreadsheet, it's fun to enter different engine speeds and see where the torque is greatest!


  14. And, I thought, Shaun the Sheep, on an ESA space craft?    Come on, Aardman are having a larf.

    But No!    I have the BBC R4 programme "Inside Science" on the wireless (!) https://www.bbc.co.uk/programmes/m0019rcp  And sure enough, the first trial shot that will orbit The Moon, WILL carry Shaun the Sheep, and as it is BBC R4, interviewing no less than Philippe Deloo, the manager for ESA of the Service Module that ESA are contributing to the NASA mission who confirmed that, it MUST be true!  Wow!


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