 | Home > Pictures & Video > Defender half track - Laird Centaur half defender half tank |
 
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| OsloBlue Member Since: 14 Jul 2018 Location: Essex Posts: 822   
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I'm on IG: https://www.instagram.com/osloblue42/
Current: TD5 '110 "Lucinda" Thread here: https://www.defender2.net/forum/topic62562.html  |
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15th May 2020 11:54am |
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| fatboyron Member Since: 28 Jul 2018 Location: Aylesham Canterbury Kent Posts: 116
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That's awesome
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15th May 2020 12:29pm |
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| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11324
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It's an interesting vehicle and was based on the Stage 1 V8. I didn't realise they built one based on a 110 though. Darren
110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia |
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15th May 2020 12:40pm |
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| Badger110 Member Since: 06 Feb 2018 Location: South hams Posts: 1039 
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I can see an overlander in the making once you ditched the tracks.
The bed area was huge! |
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15th May 2020 6:09pm |
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| Supacat Member Since: 16 Oct 2012 Location: West Yorkshire Posts: 11018 
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Would like to have seen more on the engineering and how it was all put together...
For those interested in this type of thing I got a Corona virus care package from the Tank Museum shop recently: Click image to enlarge all this for just over £40, which I thought was excellent value and helps support them when there's no money coming in the front door. Definitely worth taking a look and seeing what floats your boat: https://tankmuseumshop.org/ |
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16th May 2020 6:26am |
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| nicam Member Since: 14 Dec 2007 Location: deepest Lancashire Posts: 156 
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Interesting vehicle - I wonder how they got the drive ratio front to back correct?
It looks as though the rear sprocket diameters are a lot smaller than the front tyre diameter so will need to run much faster. Presumably it must have a suitable ratio diff on the front end of the track unit as the front and rear prop shaft speeds will be the same. Also, it sounds like the ultimate understeer vehicle from his description Don`t drive faster than your angel can fly! |
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28th May 2020 12:11pm |
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| Supacat Member Since: 16 Oct 2012 Location: West Yorkshire Posts: 11018
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Odd bit of film:
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27th Jan 2021 5:41pm |
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| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11324
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The Centaur (and most other half tracks) are just steered by the front wheels. Darren
110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia |
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27th Jan 2021 10:05pm |
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| lohr500 Member Since: 14 Sep 2014 Location: Skipton Posts: 1316 
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The question on diff ratios got me thinking and with lock down there is plenty of time for this!!! So here we go with some complete speculation 
According to this video, it used a Jag diff and another webpage I found said it had inboard discs at the rear which I suspect means it used a Jag rear axle unit. There were a wide range of diff ratios available for the Jag rear axle. I can't find any info on the diameter of a standard CVR T drive sprocket. But if it had standard 7.50 x 16 front tyres, they have a rolling circumference of 99.9" according to google. If I've got the maths right, and they put a standard 4.7:1 LR diff in the front, then for every turn on the prop, the vehicle would move by 21.1" If they used the lowest ratio jag diff at 2.88:1 for the rear, then I think the sprocket would need to have a circumference of 60.8" to generate the same 21.1" of travel. That gives a diameter for the sprocket of 19.4". Hard to tell from the photos what size the sprocket is but I don't think it is as big as 19.4" If they used a standard series box in the early versions then they would most likely run in rear drive only on good ground, so a slight difference in prop speeds wouldn't be an issue until they engaged 4wd. With the later Range Rover box, I guess the centre diff would cope with a small variation in prop speed and it would only become an issue when they locked the centre diff. As money was often not an issue on these projects, they could have had a custom rear diff made with a suitable ratio to match the CVR T sprocket size to the 7.50 x 16 front tyre size, running any of the standard LR diff ratios up front. Does anyone know more about the transmission set up? With a Jag rear end, they could even have incorporated a limited slip diff as I believe some Jags had these. |
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28th Jan 2021 9:52am |
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| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11324
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All except one of the prototypes were based on the Stage 1 V8 and used its permanent four wheel drive transmission with vacuum operated centre diff lock. The exception used a 110 front end but the transmission was the same.
I'm not sure about the diff ratio but you're right about the disc brakes. Here's a picture of the complete unit: Click image to enlarge I found the picture here https://tanks-encyclopedia.com/laird-centaur/ and the article does actually say that the brakes were to assist with steering, which is a surprise. I've no idea how, or even if, they're linked to the front wheel steering though  Darren
110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia |
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28th Jan 2021 10:48am |
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| Pacha Member Since: 23 Feb 2020 Location: North Yorkshire Posts: 772 
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They will be independent of each other and (poss) separate to the steering.
This will allow one of the tracks (the inside one) to be braked to slew the thing similar to a tank. Rgds. Chris |
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28th Jan 2021 11:19am |
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| Supacat Member Since: 16 Oct 2012 Location: West Yorkshire Posts: 11018
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28th Jan 2021 11:53am |
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| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11324
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Yeah, I know how they work but can't see how they're operated. As far as I can see, there are no additional controls in the cab so they must be linked somehow to the standard LR steering. Darren 110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia |
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28th Jan 2021 12:25pm |
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| jim4244 Member Since: 13 Apr 2014 Location: Bedfordshire Posts: 774  
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One of my yearly favourite day out Supacat! Just a shame that Tank Fest was cancelled last year and will probably be cancelled this year too.... I’m fairly close to IWM Duxford which is good but there are barriers everywhere along with “Do no touch” signs. Still a good day out but the Tank Museum wins by a head and shoulders! Jim |
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28th Jan 2021 12:32pm |
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