Author Topic: Lockheed AC-130 & M102 105mm Howitzer Engineering question please?  (Read 4211 times)

Offline tankmodeler

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Re: Lockheed AC-130 & M102 105mm Howitzer Engineering question please?
« Reply #30 on: August 14, 2018, 01:04:33 AM »
It has a muzzle velocity of 1542m/s.

That muzzle velocity's a tad high, no?  ;D Looks like 534 m/s or 1735 ft/s is a better number.

And 4700 rounds of barrel life isn't horrible. Even if you fire a hundred rounds a mission, that's 47 missions and I can't see them firing a hundred rounds on average, would they?

Just sayin'...

Paul

Offline apophenia

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Re: Lockheed AC-130 & M102 105mm Howitzer Engineering question please?
« Reply #31 on: August 14, 2018, 06:27:41 AM »
That muzzle velocity's a tad high, no?  ;D Looks like 534 m/s or 1735 ft/s is a better number.


I note that www.scorpiontank.co.uk gives your more realistic 534 m/s. I liked Rickshaw's suggestion of a 90mm Mecar ... but I guess we need a timeframe from M.A.D.
« Last Edit: August 18, 2018, 07:04:19 AM by apophenia »
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Offline Rickshaw

  • "Of course, I could be talking out of my hat"
Re: Lockheed AC-130 & M102 105mm Howitzer Engineering question please?
« Reply #32 on: August 14, 2018, 01:05:41 PM »
It has a muzzle velocity of 1542m/s.

That muzzle velocity's a tad high, no?  ;D Looks like 534 m/s or 1735 ft/s is a better number.

Correct.  My error.  That was the APDS round for the L11 120mm tank gun, which is also designated L23a1.

Offline tankmodeler

  • Wisely picking parts of the real universe 2 ignore
Re: Lockheed AC-130 & M102 105mm Howitzer Engineering question please?
« Reply #33 on: August 14, 2018, 11:22:37 PM »
Correct.  My error.  That was the APDS round for the L11 120mm tank gun, which is also designated L23a1.
Wow, that's a spectacularly high number for an APDS (probably FS-T as well) round. I believe it, but wow, that's fast. Mach 4+. Almost, technically, hypersonic.

Cool info, ta.

Paul

Offline M.A.D

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Re: Lockheed AC-130 & M102 105mm Howitzer Engineering question please?
« Reply #34 on: November 15, 2019, 12:06:38 PM »
My sincere apologies for my lack of participation on this means 😞

In my long overdue response to this topic, after time to deliberate, Rickshaw and apophenia I'm liking your notion of the MECAR 90/28 mm gun 😯, especially seeing that in my Alternative ADF ORBAT, I have the Australian Army using Canon Antitank d’Infanterie 90 mm (CATI 90) from 1954 to ~1962. In which case I could have the realistic case of the MECAR 90/28 mm guns being removed from the chassis and put into 'War Stocks', and then in 196?, with the operational need of the DHC-4T Caribou gunships, some of these MECAR 90/28 mm guns could be utilised 😯

Now from what I've been able to find, "the total weight of the MECAR 90/28 mm gun is 274 kg and featured a hydraulic recoil system. The gun had a recoil of 2500 kg and a recoil length of 40 cm, both of which are relatively low. The breech mechanism was semi-automatically cam-operated, the cases were ejected automatically."

So with the forums knowledge, do we think this MECAR 90/28 mm gun would be viable in the DHC-4T Caribou gunship? Maybe a low recoil cradle modelled on that of 105mm howitzer employed on the AC-130 could be utilised, to save cost and time......

(Please note, I also envisage the Australian Army employing the 90mm in the fire-support role, as opposed to the 76mm L23A1in my Alternative ADF ORBAT, so ammunition comparability will be there - especially as I picture these DHC-4T/DHC-5 gunships being versed in forward operation with Army units as part of their SOP's....)

Please note, someone from another forum sent me this:

"The 90mm/46 KEnerga, sometimes marketed as the Cockerill Mk8,  was offered as a towed gun in the late 80s/early 90s. KEnerga a confusing program, I believe initially developed by MECAR but later marketed in a collaboration with Cockerill. MECAR had previously sold a towed version of its 90mm/28 light gun as well."

So I'm wondering if the RAAF would be able to incorporate this '90mm/46 KEnerga' or the 'towed version of its 90mm/28 light gun' for the larger, more powerful DHC-5 Buffalo gunship.

(Would love to know more about this '90mm/46 KEnerga' or the 'towed version of the 90mm/28 light gun', if anyone, with the exception of GTX who has already sent me what he's got 😯)

M.A.D
« Last Edit: November 17, 2019, 04:49:13 AM by M.A.D »

Offline tankmodeler

  • Wisely picking parts of the real universe 2 ignore
Re: Lockheed AC-130 & M102 105mm Howitzer Engineering question please?
« Reply #35 on: November 26, 2019, 11:46:00 PM »
So with the forums knowledge, do we think this MECAR 90/28 mm gun would be viable in the DHC-4T Caribou gunship? Maybe a low recoil cradle modelled on that of 105mm howitzer employed on the AC-130 could be utilised, to save cost and time.....
Fundamentally, the 90mm should be suitable in a 'Bou. There may, indeed need to be a secondary or modified recoil system to lessen the recoil impulse as a 2500 kg sideload on the fuselage may be tough on the airframe and a bit of a b!tch from the aircraft control POV if applied as quickly as an artillery piece generates it. Spreading it out even a little bit makes a huge difference to both the structure and the flying characteristics.

The 'Bou is a MUCH smaller aircraft than an C-130 and 2500kg is 2/3 of it's max rated payload, so there would probably be a need to reinforce the structure of the airframe as well as possible limits on what other weapons could be carried as well as limits on ammo and sensors.

The C-130 can handle on the order of 15-19 metric tons (depending on specific version) whereas the 'Bou can only manage 3.6mt, just a bit more than a DC-3. It's an indicator of how careful one might have to be with installing heavy weapons.

HTH

Paul

Offline M.A.D

  • Also likes a bit of arse...
  • Wrote a great story about a Christmas Air Battle
Re: Lockheed AC-130 & M102 105mm Howitzer Engineering question please?
« Reply #36 on: November 30, 2019, 01:18:00 PM »
Thanks Paul (tankmodeler), very informative feedback!!👍


MAD