JonL
Elder Statesman
WWSME (Wiltshire)
Posts: 2,909
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Post by JonL on Jan 2, 2024 16:25:28 GMT
9.3 bhp per litre? I bet it was thirsty too...
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Post by ettingtonliam on Jan 2, 2024 21:54:34 GMT
Hemmingway Kits do castings for E T Westbury's Seal and Sealion 4 cylinder petrol engines. Nice straightforward engines, might fit nicely?
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miken
Part of the e-furniture
Posts: 480
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Post by miken on Jan 3, 2024 6:50:43 GMT
9.3 bhp per litre? I bet it was thirsty too... Apparently it had an operational range of 37 miles which doesn't sound very much until you think about the top speed of 5 mph. It would take over 7 hours to cover that distance which I think would be exhausting.
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miken
Part of the e-furniture
Posts: 480
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Post by miken on Jan 13, 2024 20:34:22 GMT
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JonL
Elder Statesman
WWSME (Wiltshire)
Posts: 2,909
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Post by JonL on Jan 15, 2024 17:30:29 GMT
Phenomenal work.
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miken
Part of the e-furniture
Posts: 480
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Post by miken on Jan 21, 2024 17:29:19 GMT
The normal way for the driver and tank commander to enter the vehicle is through these doors at the front. The 2 hinged flaps are 6mm thick in full size. I think they would be heavy to lift if they were much thicker. They have stops fitted to the rear hinges to prevent them flopping open and getting caught in the tracks. Im pretty sure that 6mm plate would not stop a WW1 bullet fired square on, but these are sloped at around 20 degrees which increases the effective thickness several times. also the slope helps to deflect projectiles. Even so, I would not like to sit inside there with bullets rattling off these thin sheets. The drivers hinged visor is made from thicker plate due to it being near vertical. The driver has 3 x 6mm wide vision slits through which to see when he is driving buttoned up with the visor down. A WW1 bullet is typically around 8mm diameter and made mostly of lead. A round like that will easily deform and pass through a 6mm slit. Apparently the friction generated when doing so means that a solid lead bullet entering and passing through one side of the slit at high velocity will emerge the other side as liquid lead. Very unpleasant if you are behind it. Ive seen pictures of these tanks with fake black painted on slits to distract enemy marksmen from the actual aperture.
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Post by steamer5 on Jan 22, 2024 7:21:16 GMT
Hi Mike, Looking really great! I came across an interesting YouTube video of the full-size version that’s been restored that shows the painted slits as you describe, like you say, under fire must of been a very scary! youtu.be/2EEFX-FNBx8?si=oThPagCN_DNbHUXxCheers Kerrin
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miken
Part of the e-furniture
Posts: 480
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Post by miken on Jan 22, 2024 9:29:26 GMT
Hi Mike, Looking really great! I came across an interesting YouTube video of the full-size version that’s been restored that shows the painted slits as you describe, like you say, under fire must of been a very scary! youtu.be/2EEFX-FNBx8?si=oThPagCN_DNbHUXxCheers Kerrin Yes, I've seen that. Notice how the fake slot is painted on the yellow paint so it shows up and the actual slit is on the brown where it is less conspicuous. When he turns the turret It reminds me of a Dalek!
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miken
Part of the e-furniture
Posts: 480
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Post by miken on Feb 4, 2024 18:37:59 GMT
Ive done a bit more work. Finished the front suspension.
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miken
Part of the e-furniture
Posts: 480
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Post by miken on Feb 4, 2024 18:40:52 GMT
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miken
Part of the e-furniture
Posts: 480
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Post by miken on Feb 4, 2024 18:49:28 GMT
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Post by David on Feb 4, 2024 20:45:19 GMT
Outstanding!
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miken
Part of the e-furniture
Posts: 480
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Post by miken on Feb 11, 2024 9:58:12 GMT
Ive been working on the turret traverse. Now, Ive heard of a dining room table device called a "lazy Susan". When searching for "thin ball bearings" I came across an actual ball bearing called a "Lazy Susan Bearing" Apparently its a thing. Who knew? Anyway I purchased one and its an ideal fit with no modifications. Even the holes were drilled in the right place. I found a really nice little 12v motor gearbox on AliExpress for £2.40!! The ring gear was laser cut for my by Ed at ME laser and pressed straight onto the bearing. Laser cutting gives a bit of a coarse finish for gears but for this application which only gets slow , occasional use it will do. I connected it to a battery and it turns nicely.
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miken
Part of the e-furniture
Posts: 480
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Post by miken on Feb 11, 2024 10:09:43 GMT
I purchased a couple of 12v motor/reduction gearboxes and fitted them . Ali Express again. Very reasonable. Under £10 each. Beautifully made with steel gears and a hardened and ground output shaft. They seem very powerful for the size. I have now had the tank driving under its own power (in straight lines) in my garden. The hull assembly will soon be finished. Then I will tidy up and paint the inside and fit the r/c equipment. I still get excited when I get to the stage of construction of a model and realise "I could put coal/petrol/compressed air, or in this case a battery in this and see if it goes". Hence the decidedly dodgy wiring in the picture.
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millman
Part of the e-furniture
Posts: 297
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Post by millman on Feb 11, 2024 18:16:14 GMT
You were lucky with the lazy Suzan bearing being the right size, these bearings also make great turntables for spray painting. I love the motor and gearbox, I must have a look on Ali Express I need a couple for an upcoming project.
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miken
Part of the e-furniture
Posts: 480
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Post by miken on Feb 11, 2024 18:55:22 GMT
Today I finished the "Bonnet catch"
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miken
Part of the e-furniture
Posts: 480
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Post by miken on Feb 11, 2024 18:58:12 GMT
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miken
Part of the e-furniture
Posts: 480
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Post by miken on Feb 11, 2024 19:09:59 GMT
The flanged boss with the square ended shaft sticking out is where the starting crank handle goes. Hopefully the driver doesn't stall the engine in the middle of a battle and have to get out and re-start it. I found these little shackles on ebay which are exactly the right size and shape. I just had to make the retaining pins for them. They are stainless steel which isn't ideal but I soaked them in phosphoric acid for a few days which has taken the shine off them. If I paint them then hopefully the paint will now stick ok. Or I might just heat them up and oil black them.
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johan
Active Member
Posts: 29
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Post by johan on Feb 11, 2024 21:12:45 GMT
This really is awesome.
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miken
Part of the e-furniture
Posts: 480
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Post by miken on Feb 14, 2024 22:37:25 GMT
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