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Armor/AFV
For all military ground-force modelling subjects.
My first HEMTT - the Italeri LHS
165thspc
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Posted: Wednesday, November 02, 2016 - 06:47 AM UTC

Quoted Text

That A3 looks really cool. Can't wait to see how yours comes out.

On another note, the Mk 23 suspension is the same as on the HEMTT A4. So you might want to stock up on a few more Mk 23 kits.



I thought just the front most axle used the Oshkosh TAK-4 coil structure on the A4.

Oh well it's only money and plastic!
165thspc
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Posted: Wednesday, November 02, 2016 - 06:58 AM UTC
I could definitely go for the A4 but as stated earlier I have a special interest in the A3 so I am going to have to stay on course for that destination!
HeavyArty
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Posted: Wednesday, November 02, 2016 - 07:05 AM UTC

Quoted Text


I thought just the front most axle used the Oshkosh TAK-4 coil structure on the A4.



I guess we are both off. Oshkosh says, "The suspension on A4 models is Holland air suspension, load rating on the rear axles varying by configuration."

Like in this pic.


Apparently the M1074A1 PLS (latest version) has a front TAK-4 suspension. The rear is the Hendrickson RT400, the same walking beam type on standard PLS/HEMTTs. I guess it still has the same air bag w/swing arm set-up on the middle axle too. Interesting that they would mix them up like that.

From Oshkosh again, "The TAK-4® independent suspension system
offers unmatched stability and mobility...

Front Axle: Oshkosh TAK-4® with AxleTech® carriers with differential lock and planetary wheelends
Rear Axle: AxleTech with differential lock and planetary hubs
Suspension: Front – Oshkosh TAK-4 independent
Rear – Hendrickson RT400"



165thspc
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Posted: Wednesday, November 02, 2016 - 07:59 AM UTC
My fault - I remember now - like you say, it is the A1 revision of the PLS that uses the TAK-4 coil suspension on the #1 axle.

I wonder how they handle the suspension on the #2 axle? Another TAK-4?

On a third read through of your info above I feel it is saying that BOTH the #1 and #2 axles use the TAK-4 coil suspension. My bad.
165thspc
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Posted: Wednesday, November 02, 2016 - 08:27 AM UTC
Gino, the Oshkosh literature says the A3 has variable height suspension. Any idea how they make coil spring suspension variable?

They could just be referring to varying the height using the tire inflation system. Any ideas?
Taylornic
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Posted: Wednesday, November 02, 2016 - 08:34 AM UTC
That will be another cool project from the HEMTT Skunk Works!

All this talk of Mk23 suspensions has got me reinterested in doing the Mk23 triaxle LHS version. I like the way it looks, but AFAIK its not being used by the Marines.




Not HEMTT related, but this is what I want next...

Removed by original poster on 11/03/16 - 04:56:26 (GMT).
Taylornic
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Posted: Wednesday, November 02, 2016 - 10:14 AM UTC
My apologies. My Photobucket was giving me fits and I lost edit abilities in my last post. I never realized the author of a post doesnt have continuous edit abilities for errors/updates etc...

MK23 LHS



My non HEMTT next up project.

DocEvan
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Posted: Wednesday, November 02, 2016 - 10:17 AM UTC
Ohmigawd, Taylor, that White crane is to die for!!!!!!!!!!!!!!!!!!!!!!
Taylornic
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Posted: Wednesday, November 02, 2016 - 10:29 AM UTC

Quoted Text

Ohmigawd, Taylor, that White crane is to die for!!!!!!!!!!!!!!!!!!!!!!



Evan, My thoughts exactly! I ran across it while searching for Quickway info. The guy did a great job! PSP Models had the Quickway listed as upcoming before they went under. I was hoping Scale Link would follow through, but it never happend.

I had hoped maybe Mirror Models would take a stab at it, but nothing there either. I finally decided its time to start gathering resources!
165thspc
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Posted: Wednesday, November 02, 2016 - 10:54 AM UTC
Another great scratch/conversion for the White 666 !
165thspc
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Posted: Wednesday, November 02, 2016 - 10:59 AM UTC
Taylor, As to the Mk 23 LHS it looks like you are going to need some frame extensions and an extra set of tires/wheels for your build. I think I am very shortly going to be in a position to help you out.
HermannB
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Posted: Wednesday, November 02, 2016 - 11:19 AM UTC
Holland Air Suspension

http://ww1.safholland.us/sites/usa/en-US/products/truckandbussuspensions/Pages/NEWAY%20AD%20Series%20Truck%20and%20Tractor.aspx

Very detailed walkaround on a M977 A4

http://www.primeportal.net/transports/dieter_krause/m977a4/
Taylornic
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Posted: Wednesday, November 02, 2016 - 12:55 PM UTC

Quoted Text

Taylor, As to the Mk 23 LHS it looks like you are going to need some frame extensions and an extra set of tires/wheels for your build. I think I am very shortly going to be in a position to help you out.



Thanks Mike, it would be appreciated!
165thspc
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Posted: Wednesday, November 02, 2016 - 02:43 PM UTC
Taylor' are you planning on building the long frame 6x6 LHS or the 8x8 LHS? The 8x8 looks very cool!
HeavyArty
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Posted: Wednesday, November 02, 2016 - 06:08 PM UTC

Quoted Text

Gino, the Oshkosh literature says the A3 has variable height suspension. Any idea how they make coil spring suspension variable?

They could just be referring to varying the height using the tire inflation system. Any ideas?



My guess is they are referring to the CTIS. I don't think the air bag suspension raises and lower the vehicle. If it did, you would loose the cushioning effect of the air bags, the whole point of the system.


Quoted Text

All this talk of Mk23 suspensions has got me reinterested in doing the Mk23 triaxle LHS version. I like the way it looks, but AFAIK its not being used by the Marines.



That MTVR 16.5-Ton 8×8 Heavy Load Handling System (LHS) looks awesome. It should be pretty easy to do by combining the Mk 23 and the M1120 LHS parts too. Can't wait to see it.
165thspc
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Posted: Wednesday, November 02, 2016 - 08:17 PM UTC
[/quote]That MTVR 16.5-Ton 8×8 Heavy Load Handling System (LHS) looks awesome. It should be pretty easy to do by combining the Mk 23 and the M1120 LHS parts too. Can't wait to see it.[/quote]

I totally agree!

Taylornic
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Posted: Wednesday, November 02, 2016 - 11:22 PM UTC

Quoted Text

Taylor' are you planning on building the long frame 6x6 LHS or the 8x8 LHS? The 8x8 looks very cool!



I want to try for the 8x8, it just has "that look".
Taylornic
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Posted: Thursday, November 03, 2016 - 12:31 AM UTC
Gino, agreed on the 8x8 conversion. Axles 3 and 4 are steerable. Not sure if I will need to go with a pair of front steer axles for the #3 and #4 positions or if a rear axle can be easily modified for steering.

I built the MK23 but left it in the Philippines when I returned. I cant remember the modeled differences between the front and rear axles. Should be an easy convesion.
165thspc
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Posted: Thursday, November 03, 2016 - 03:41 AM UTC
In this Oshkosh photograph the #1 and #4 axles are clearly steering. (The vehicle sales literature says the #3 axle also steers.)

I would say that there has been some photoshop work done here so nothing is for sure. Something does not look right with wheel #3. #3 looks straight, not turned and looks out of alignment with wheel #2.

HeavyArty
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Posted: Thursday, November 03, 2016 - 04:45 AM UTC
The third axle looks in line w/the second one to me. I don't think it has been photo-shopped, just a weird angle. I don't see why the third axle would need to be turnable. The PLS only has the rear axle turnable and it is pretty much the same setup.

As to the Mk23 model axles, they are all the same as part of the TAK-4 suspension and all can be easily turned as there are stabilizer arms that attach to steering arms on the rear axles to keep them straight. Check out my build review of the Mk23 to see more. I address turning the front wheels there. The rear can be turned in the same way.
165thspc
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Posted: Thursday, November 03, 2016 - 05:46 AM UTC
Gino I think I have to disagree with you on this one. On the photo in question wheel #3 looks parallel to #2 but off-set laterally from it.

The published Oshkosh sales literature definitely says axles #1, #3 & #4 steer.

One proposal that would explain both the steering and the photo: old steam locomotives used a trick to get around tight curves. The last drive axle did not steer but did move sideways in it's journal boxes to allow for some slight lateral movement and greater flexibility.

The entire number three axle assembly structure might move laterally (side to side) to allow it to more closely follow an overall curved line as the vehicle turns. It only needs to move to a small degree.

WRONG - A possible solution but incorrect for this vehicle!
165thspc
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Posted: Thursday, November 03, 2016 - 06:16 AM UTC
This is what I think might be happening.




WRONG - A possible solution but incorrect for the MK23 vehicle!
Taylornic
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Posted: Thursday, November 03, 2016 - 06:24 AM UTC
I wish there were more than four pictures available. It will be an easy conversion, but it would be nice to know how those last 2 axles really work. If I only knew what the rear steering box looked like...
165thspc
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Posted: Thursday, November 03, 2016 - 07:54 AM UTC
Yes I do wish there were more photographs or some drawings of the 16.5 ton LHS.