Okay folks I went back and looked this one up, here is the story. Much of the second post on this thread outlines the overall intent of these 15 planned designs well but the back ground draws from BattleTech Shattered Dawn and this blurb from TRO2800 on Restricted Technologies which explains why certain canon dropships have two entirely different intro dates.
Restricted Technologies
The Star League, and the Terran Hegemony before it have long had a history of banning the sale of advanced technologies to the Great Houses. This ban ranged from small components to weapons to BattleMechs, Dropships and even Warships. The Great Houses chaffed under this policy and repeatedly attempted to have it repealed, but to no avail. One of the most frustrating bans was on the sale of specific Dropship designs. The SLDF developed several innovative new designs but refused to sell them to the Great Houses, in an effort to maintain an advantage over the Inner Sphere Navies. In some cases the reasons for withholding these designs from the Great Houses is obvious. Some of the designs were assault ships, such as the Avenger, Pentagon and Titan, which far outclassed the designs used by the Great Houses. These vessels featured better maneuverability and firepower then existing designs and the SLDF was afraid that providing the InnerSphere Navies with access to the designs would enable the Houses to develop new ships that could out class those of the SLDF. Other designs, such as the Seeker, Condor, Vengeance and Colossus found themselves on the restricted list because of their transportation capacity. By keeping transports smaller, it would require more vessels to move troops. This would help ensure the Houses could never launch an effective campaign against the SLDF, as they would require so many transports that operations would become unwieldy. Only the SLDF had the ability to rapidly move large forces, ensuring they could bring their superior forces to bear during any conflict. In other cases the SLDF and Terran Hegemony sought to maintain an economic advantage over the Great Houses. The large and efficient Mammoth and Behemoth would provide Hegemony companies with an advantage over other companies forced to rely on smaller and less efficient vessels. It was this sort of action that would result in a large number of protests from the House Lords, who rightly accused the First Lord of abusing his position to benefit the Terran Hegemony at the expense of the Great Houses. With the fall of the Star League, the Great Houses started to get access to the advanced Star League dropship designs. While some companies remained loyal to the Star League and the new Terran Republic and refused to sell their ships to the Great Houses, other companies have been selling their ships as quickly as they can produce them. Perhaps most disturbing of all is the outright theft of patented technologies including some dropship designs by foreign corporations. Certain Successor Lords have encouraged this illegal behavior which has sharply increased since the fall of the League.
The reasoning that these designs are Terran (or Royal SLDF) and that the Clans would still have them but just not speak a lot about them because of their lack of combat value at least in their Trial driven system we have the appearance or reappearance of these designs.
Military DesignsThese 10 military designs were created by individual Clans to fill an obvious niche
Aculeus Assault Transport
Mass: 1,900 tons
Thrust: 5/8
Carries: Three Mixed Points
Manufacturer: Goliath Scorpion
Notes: This one is already posted on the thread and is sort of a special forces lander almost. Not sure how it came out in regards to deployment of a unit. There is a fuzzy memory of something in error about the amount of troops deployed.
Fury IIC Troop Carrier
1,900 tons
4/6
Light Nova Transport (10 Light Vehicles & 25 Elementals)
Hell’s Horses
Pentagon IIC Assault Ship
4,000 tons
7/11
Naval Escort
Snow Raven
Condor IIC Troop Carrier
4,500 tons
3/5
Heavy Nova Transport (10 Heavy Vehicles & 25 Elementals)
Diamond Shark
Hector Assault Ship
4,500 tons
10/15
Faster Clan version of the Achilles
Ice Hellion
Seeker IIC Troop Carrier
6,700 tons
5/8
30 Heavy Vehicles & 75 Elementals
Blood Spirit
Notes: Obvious with frontline units sporting vehicles you need something to deploy them
Torguud Assault Transport
9,000 tons
3/5
Clan Fortress (15 Mechs, 10 Fighter, 25 Elementals)
Nova Cat
Notes: Combined arms transport meant to transport a third of the standard Clan Cluster. Part one of the Kheshig Project conducted by three Clans and the Free Guilds in order to better facilitate transport
Vengenace IIC Aerospace Carrier
11,400 tons
4/6
4 Binaries of Fighters (40 fighters)
Cloud Cobra
Khevtuul Transport
20,000 tons
5/8
Full Cluster transport based on the Lee
Steel Viper
Notes: Based on the Colossus with inspiration from the Lee (combat speed)
Carry a full Steel Viper cluster with good armor and excellent speed
50 Mechs, 15 Fighters, 75 Elementals (or 45 Mechs, 20 Fighters, 75 Elementals)
Part two of the Kheshig Project conducted by three Clans and the Free Guilds in order to better facilitate transport
Civilian DesignsThis is where the Free Guilds come in (link below detailing my thoughts on them mentioned in the Jade Falcon Sourcebook) and their jump start of transport craft with Quicksilver. These six non-combatants help fill out the Clan fleet.
https://www.ourbattletech.com/forum/index.php?topic=2556.0Exodus Liner (5,000 tons) based on the Monarch
Mule IIC Cargo Carrier (11,200 tons) deweaponized
Clydesdale Tug (15,000 tons)
Colossus IIC Cargo Carrier (20,000 tons) deweaponized
Mammoth IIC Cargo Carrier (52,000 tons)
Behemoth IIC Cargo Carrier (100,000 tons)
Need to Do!I still have to research existing Clan dropship production which is not exclusively a Snow Raven deal.