NationStates Jolt Archive

Reliability, flexibility and lethality.
The LY105 30mm automatic cannon. For all your design requirements.

The LY105 is a single barrel, externally powered (4 HP electric motor), electrically fired weapon. It fires 30mm linkless ammunition at a rate of 625 ± 25 rounds per minute. The LY105 has a positive cook-off safety (open bolt clearing) and double ram prevention. It uses the following shells, loaded at unit level:
LY89 High Explosive Dual Purpose (HEDP) rounds for anti-armor and anti-personnel
LY99 High Explosive Incendiary (HEI) rounds for anti-personnel and anti-materiel
LY214 API (Armor Piercing Incendiary) (DU) 30mm Ammunition
The system is designed to be reliable, flexible, accurate, compact and possessed of a high degree of lethality. Within a range a little over 6,000 metres the LY105 delivers maximum effectiveness against land-, air- and sea targets. Combining high performance and rate of fire with the very latest in ammunition technology, this integrated weapon system offers long-term dependability even under the most gruelling of field conditions.
Unlike most automatic systems, the LY105 does not depend on gas or recoil to power its repeater system. Instead, it uses a 4.0 hp motor, located in the receiver group to drive the chain and triple-feed system. This system uses a variety of sprockets and extractor grooves to chamber, load, fire, extract, and eject rounds. A system of clutches and gears allows the gunner to switch between ammunition types during an engagement, and the weapon features an integrated ammunition counter. Further, the gunner can choose from three rates of fire:
(1)Single Shot Semi-Automatic
(2)Low Rate Fully Automatic, 200 rounds a minute, ± 25 rounds; and
(3)High Rate Fully Automatic, 625 rounds a minute, ± 25 rounds.
The weapon has been rated at 28,000 mean rounds between stoppages, placing it firmly in the top 5% reliability niche, within the global automatic cannon market. The barrel is chrome-lined, and fitted with a high efficiency muzzle brake as standard.

This system can be fitted to land, sea or air platforms, and is saltwater-safe.
The Lyran Protectorate is offering this weapons system at a highly competitive price per unit, and will offer limited production license on a per-unit to be constructed basis. Ongoing technical support is available at no extra cost, for orders upwards of 30 units, and for any licensing agreement.


Caliber: 30mm x 173
Muzzle velocity: 1584mps/5200fps
Rate of fire: 625 rounds per minute
Range: 6005m/ 19,700 feet
Length: 1.98 m
Weight: 107.5kg

Cost per unit: NS$210,000

Cost to acquire manufacturing licence (select which package):

Class A license: 0-100 units, NS $2,000,000, + $100,000 per unit manufactured.
Class B license: 101-500 units, NS $10,000,000, + $80,000 per unit manufactured
Class C license: 501-1000 units, NS $45,000,000 + $60,000 per unit manufactured
Class D license: 1001 + , NS $90,000,000 + $40,000 per unit manufactured
Open licence: No pre-set production limit. NS $4 bn + $10,000 per unit manufactured.

Executive Command maintains oversight of all transactions, and may refuse purchases at any time.
Purchasers or manufacturers of this weapons system may claim a 5% discount on other Lyran products.
Purchasers or manufacturers of other Lyran products may claim a 5% discount on on this weapons system.



Nations utilising the LY105

Buddha C
Asgarnieu
Minerias
Black Forest Security
North Storn

OOC: I use this?

OOC: Co-axial on the Warhound MBT.

OOC:
your length and muzzle velocity avalues are out by a bit.

muzzle velocity for a 30173mm APDS round is about 1200-1300m/s and the high MV i have seen for 30x173mm is 1385m/s for the MK268 APFSDS loading.

As for length: msot of the 30mm guns i have seen have barrels which are longer than your entire gun with most of 30x173mm (and 30x170mm) weapons having a barrel length of 2200-2500mm with overall length in the 3-3.5m region.

Range is also a bit optimistic, not even rheimental claim mroe than 3000m, what would be of more use is a penetration/range figure although they can some times be hard to come by for Rl ammo and very dificult to come up with for fantasy ammo without a lot of hand waving around the lanz Odermatt(sp) eqn.

The range was taken directly from the M230, which is mounted on the AH64 Longbow. There's no change to it in that regard. Further, the LY105 is both longer and heavier than the M230. The LY105 is based on the M242/M230 systems, which share a great deal of commonality, save the LY105 benefiting from 90 odd years of advancement.

Having said that, given the stats I've provided, it hasn't advanced very far.

The range was taken directly from the M230, which is mounted on the AH64 Longbow. There's no change to it in that regard. Further, the LY105 is both longer and heavier than the M230.

OOC: The M230 is a short barreled gun that's often floating hundres of meters above the ground. This means that it's A) Horribly inaccurate at any real range. And B) has the advantage of the bullet dropping not really effecting the range. So instead of aiming up to get range but fighting gravity the M230 just fres flat and lets gravity take the round down to the target.
In short, don't use an air based gun for stats like range of a ground based gun.

In fact, I just checked and parts of this writeup are literally ripped from Wikipedias M230 article. Shame on you.

Edit: I also can't find the M230's range cited anywhere, not even on the Wiki article you seem to have ripped. So where did you find it?

OOC: The M230 is a short barreled gun that's often floating hundres of meters above the ground. This means that it's A) Horribly inaccurate at any real range. And B) has the advantage of the bullet dropping not really effecting the range. So instead of aiming up to get range but fighting gravity the M230 just fres flat and lets gravity take the round down to the target.
In short, don't use an air based gun for stats like range of a ground based gun.

In fact, I just checked and parts of this writeup are literally ripped from Wikipedias M230 article. Shame on you.

The LY105 is based on the same M242/M230 family, and the write up was well put. The wikipedia site quotes another source, that I won't reference for lack of time right now, which is likewise identical. Given the degree of similarity, which IS very high, I felt justified. Note, M242/M230, not just M230.

OOC: But the M242 is a 25mm gun, almost twice as long as this, and has a maximum effective range of 2km. Rule of thumb is to get more range you need both a more powerful cartridge and a longer barrell, and you've only done half of that. This gun needs to be at least twice the size it is to be able to get that kind of maximum range.

The maximum range was unaltered from the M230... ?

Have found reference, and tg to you.

OOC: The M230 doesn't cite a maximum range, not on either of the two sources to the wiki page (Which are essentially the same). The only place I can find inclination of maximum range is a study of fuze range ineffectivness of the fuzes for the 30mm rounds used by the M230, but the M230 is not mentioned as the test bed, and indeed a gun isn't needed for testing range of a fuze.

OOC: Check telegrams for source material.

OOC: Check telegrams for source material.

OOC: I just did. And if I were you I'd be skeptical of a Czech source that cites no sources but gives stats that even the US government won't give.
Either way this weapon needs to be longer, much longer. As of now, just like the M230, it is little more then a high velocity grenade launcher.

OOC:
The thing is you can't really use the M230 as a base for a 30x173mm weapon, 30x113mm and 30x173mm are very very different rounds. You have to start with the M242's bigger brother the Bushmaster II/MK44. To get a decent muzzle velocity out of 30x173mm you do need a barrel length of at least 2000mm plus a good 300mm for the feed plus what ever room the drive motor.

I would say that squeezing an indentical barrel (241cm)to the mk44, a tripple feed system which admitedly adds bulk rather than length and a motor with 4 times the power into a similar length (339cm) would be a pretty good improvement.

Range figures depend on a number of factors, including what you actually mean by range (i.e. max range, accurate (point) range, or area target range, effective rnage etc etc), the 6000m given for the m230 is the area target range from an elevated aircraft. Most soruces give max effective rnage of 30x173mm as about 3000m on a ground mounting, actual max range could easily be 2-3times that.

If you are really cliaming 90 years fo advancement where is the high tech stuff? so far i haven't seen a APFSDS loading lsited, nor an ABM round and with 90 years of work why are yous till using 30x173mm? why haven't you moved on to CTA or caseless ammo or started using ETC propellants?