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Thread: Restoration of a rare ship/boarding grenade (step by step) - from Princess Maria 1686

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  1. #16
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    Quote Originally Posted by Salvor6 View Post
    Enrada after reading your post I just had to comment. You are right again. I am a machinist and it is common knowledge among machinists that the weld is harder than the outlying pieces. That is because the heat of welding will "heat treat" the the weld making it harder.
    Even if the welding is harder and if it is just put on the outside of the two parts, it makes it anyway easier to break left or right from the welding lines because cast iron is weak and if you are right, much weaker as the welding itself. We call this in german "Sollbruchstelle" in englsih I think its called breaking point. The weakness of this antique cast iron is a reason why the casted canons have such a big diameter at the end to avoid a beaking of the canon. Just compare this black powder canons to modern artillery wich uses much higer explosives.
    Last edited by Tom_Restorer; Dec 19, 2017 at 07:49 PM.
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  2. #17
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    Quote Originally Posted by Tom_Restorer View Post
    It is real a cool piece and I would love to have this one in my own collection !!
    I would like to know if an other one in this condition with the canvas and ropes exists or if I am the first one who has the honor to restore such an complete piece?!
    I just have found so far pieces with or without the wooden fuse but nothing like this.
    It has to be shown to maritime museums for sure if they don´t have any datas of such an intact piece!

    I found only an old pic wich shows a grenade made out of half-moon shaped bars and wich was holded together by the fuse itself. I guess it was also fixed with tar.

    If someone finds half moon shaped iron bars of approx 8 cm diamerter and half circled cuts on the outside to set in a rope.... it comes from one like this :-)
    I myself have never seen one that complete !! Very interesting to see how they were made. I have seen photos of ones that have the plug intact with only remnants of canvas and bitumen around the plug. I still dont understand how the ropes were utilized but I can see the benefits of the canvas for waterproofing and for keeping the bung and fuse secured. Little more technical construction than most would have thought. Wouldnt want to be below decks when 3 or four of those get thrown down the hatch !! BOOM !!
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  3. #18
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    Quote Originally Posted by Blak bart View Post
    I myself have never seen one that complete !! Very interesting to see how they were made. I have seen photos of ones that have the plug intact with only remnants of canvas and bitumen around the plug. I still dont understand how the ropes were utilized but I can see the benefits of the canvas for waterproofing and for keeping the bung and fuse secured. Little more technical construction than most would have thought. Wouldnt want to be below decks when 3 or four of those get thrown down the hatch !! BOOM !!
    Thank you Blak Bart!
    So far I can see now, the fuse don´t go on top in the wood plug but from the side. The top is complete flat under the canvas. I also found remainings of a light brown resin around the plug but the canvas is not complete covert with it. At the moment is seems the 3 ropes was the fuse. I don´t know yet if every single piece goes into the plug but I will find out. But it could be possible to make sure minimum one of the fuses will start the explosion.
    It is very exciting and I can´t wait to see all details and what is under the canvas.

    The next pics will come in a few days. The removing of the canvas needs a lot of time.
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  4. #19
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    For those who are may interested, I uploaded some pics of my other work to my albums.

    And here is some advertisment
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    Last edited by Tom_Restorer; Dec 19, 2017 at 09:49 PM.

  5. #20
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    Hi Tom

    Is it a hand grenade or an explosive cannonball?

    mvh
    Rüdiger
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    Sorry
    English is not my first language !

    http://de.groups.yahoo.com/group/SOB-International/

  6. #21
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    Quote Originally Posted by Rüdiger View Post
    Hi Tom

    Is it a hand grenade or an explosive cannonball?

    mvh
    Rüdiger
    It is a hand grenade Rüdiger.
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  7. #22

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    Tom
    When you test fire it please collect the pieces and let us look at the results.
    Just kidding!!!!!!!!
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  8. #23
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    Quote Originally Posted by enrada View Post
    Tom
    When you test fire it please collect the pieces and let us look at the results.
    Just kidding!!!!!!!!
    Just happen.... I looked inside with a candle because my endoscope had a black out.......... Booooooooom

    I will post photos of the grenade parts, my destroyed lab and the dead cat from my neighbor when I stoped bleeding

    Btw. C A N Y O U I M A G I N E how it hurts to type with just one bleeding finger! LOL The positiv on it, I am looking like a real pirate now without a sinlge hair !! Aaaaarrrrrg
    Last edited by Tom_Restorer; Dec 20, 2017 at 10:44 PM.
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  9. #24
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    Here are the removed ropes (Fuse) before cleaning. Front and backside
    Hope you can see the tar wich was used to fix them on the grenade.
    Tomorrow I upload pics from the cleaned pieces.
    Still working on the removal of the canvas.... It is heavy stuck on the rust layer.
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    Last edited by Tom_Restorer; Jan 11, 2018 at 11:11 PM.
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  10. #25
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    Update:

    Canvas is now removed and the plug pulled out.
    The grenade gets now an air abrasion cleaning (with round micro glass beads, becasue they don´t damage the surface of the black iron oxyde like sharp abrasion material does) and than it goes into controlled electrolysis.
    In this time I clean the removed canvas from the backside.

    The iron is approx 1 cm thick. The black powder was scretched out and got safed. The plug was fixed with rope and resin - as it is to see on the last picture.

    The plug has a drilled hole of 6 mm diameter and a larger one with 19 mm on the top wich is half filled with a very hard material - so just the fuse can pass to the hole.

    The weight of the gun powder - also from inside the plug - will be posted later, as well as the weight of the empty grenade.
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    Last edited by Tom_Restorer; Jan 14, 2018 at 05:58 AM.
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  11. #26
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    Wow that is so friggin cool !!! Beautiful piece !! Great restoration work tom.
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  12. #27
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    Quote Originally Posted by Blak bart View Post
    Wow that is so friggin cool !!! Beautiful piece !! Great restoration work tom.
    Not yet Mate! Let´s wait until it is finish! :-)
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  13. #28
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    Weight:

    Grenade: 443,2 Gramms
    Black Powder - from Grenade: 19 Gramms
    Black Powder from inside the Plug: 0,6 Gramms
    Diamater of the grenade: 7.8 cm

    I guess it has had a complete weight of approx 0.5 Kilo in 1686
    Even if there was a heavy layer of corrosion, this Rust has not much weight at all. The corrosion is often some thousand % of the iron wich was converted.
    Anyway, 0.5 Kilo is a good weight to throw it a nice range to an other ship.
    The exact thickness of the iron is 1 cm
    Sorry that I don´t convert it into inches and lb, but I WILL NOT use this kind of "measurment" :-) :-)

    The wooden plug is in great perfect condition. The resin has completly saved it and there is absolutly no need for an PEG treatment.

    On monday comes the pics of the grenade after air abrasion.

    The endoscope view from inside comes after the electrolysis. Makes no sense yet when rust and traces of powder cover everything.

    Regarding my question in my first post: I found out now that the canvas was completly fixed at the plug and the grenade with resin and the part around the plug down to the neck of the grenade was also covert with resin from the outside.
    I think now it had two reasons.
    1. to protect the gunpowder from humidity
    2. to hold the plug in position until the grenage explodes and to avoid that just the plug gets blown out.
    So they fixed this two problems with it.
    Last edited by Tom_Restorer; Jan 14, 2018 at 04:42 PM.
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  14. #29
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    an amazing find. This was found on land?

    I imagine the tar help protect this from the elements, correct?

    Any idea on the wood material type the plug is made from?

    Concerning the weld, any speculation on how this weld was completed in the 1686 time frame? Today such a weld may be harder due to being heat treated but in 1686 would this welding process be hot enough to heat treat the material as much, or just enough to bond together the halves?
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  15. #30
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    Quote Originally Posted by dognose View Post
    an amazing find. This was found on land?

    I imagine the tar help protect this from the elements, correct?

    Any idea on the wood material type the plug is made from?

    Concerning the weld, any speculation on how this weld was completed in the 1686 time frame? Today such a weld may be harder due to being heat treated but in 1686 would this welding process be hot enough to heat treat the material as much, or just enough to bond together the halves?
    It comes from the wreck of the Princess Maria wich sunk in 1686. (stands at the begin of this thread)
    Tar was only used to fix the ropes/fuse on the iron. The canvas on top was fixed and covert from outside with resin.
    No idea yet wich type of wood was used.
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