JamesFennell MBE Profile picture
Jun 26, 2025 17 tweets 6 min read Read on X
The missing link to make sense of the SDR and recent decisions on air power is a major ACP (Loyal Wingman) programme for both RAF and FAA.

This is an SDR recommendation and needs to be properly funded (billions), but is unlikely to get those resources until after 2029. Image
Introduction of an ACP to FAA needs to be timed with a 2030s MLU of the carriers, but can enter service earlier with the RAF, initially as part of UK IAMD and for the SEAD/DEAD mission, increasing mass in the fast jet force. Image
BAE and MHI have begun cooperation on ACP designs for GCAP, and Boeing Australia is looking for European partners to develop MQ-28 Ghostbat. General Atomics and Anduril are flying new lower cost designs for USAF, and Airbus and Saab have both shown concepts. Image
Affordable designs are more likely to be attractive to the RAF and could be fielded relatively quickly if resources are made available. They also have the advantage of needing less powerful catapults if adopted by FAA. Anduril's YFQ-44A Fury, for exmaple. Image
General Atomics YFQ-42 is another 'fighter drone' - smaller, lower cost and more agile - than the larger 'bomb truck' strike drones such as MQ-28 and XQ-58. The former is probably attractive for both the RAF and FAA for IAMD, and could be fielded sooner. Image
Dassault is pursuing a development of its Neuron drone as a heavyweight strike drone to accompany Rafale and SCAF. This is a much larger stealthy platform, designed to increase the strike potential of the realtively small Rafale and SCAF crewed platforms. Image
Given that GCAP has evolved into a much larger crewed deep strike platform, RAF and FAA may be more interested in a agile 'fighter' drone initially, for increasing IAMD mass, freeing Typhoon, F-35 and GCAP for the strike mission alongside long range drones and missiles. Image
FAA needs a tanker for F-35B, this could point to the MQ-25 Stingray, which can also provide a high flying communications node for the new 'Digital Targeting Web'.

MQ-25 will need the carriers to aquire a relatively large EMALS during MLU, which could also launch strike CCAs. Image
For now the RAF's only major autonomous programme remains MQ-9B, although a tiny investment in 24 of Tekever's AR3 ISR drones was announced earlier in the year. This will need to change if the F-35 mix leans towards 'A' over 'B' to enable a 'hybrid air wing' on the carriers. Image
Leonardo have partnered with Baykar to develop drones in Italy, and one idea floated for GCAP is an autonomous variant of Leonardo's M-345/6 jet trainer, and Turkey has tested its Anka-3 stealthy combat drone and Kizilelma 'fighter' drone. Image
France, Italy and Germany are all moving forward rapidly on CCA/ACP programmes for SCAF and GCAP and Italy has chided the UK for dragging its feet, despite a blizzard of strategiies on autonomous systems. The US, Australia, Turkey and Japan are all moving rapidly to aquire CCAs. Image
Despite the rhetoric on autonomy the RAF has been slow to invest in R&D or systems when compared to our peers and adversaries. LANCA/Mosquito was never properly funded and the fanfare over 'swarming drones' proved farcical. Taranis was abandoned when UK had the leading edge. Image
This stands in sharp contrast to the navy, which has invested heavily in both autonomous R&D and systems and now has mature programmes such as the Anglo-French autonomous MCM system, 'Proteus' ASW drone, 'Peregrine' ISR drone, 'Cetus' XLUUV and Patrick Blackett resarch vessel. Image
These are now leading to an autonomous shipbuilding programme for Type 91 Arsenal Vessels, Type 92 ASW Sloops and Type 93 XLUUV Chariots.

Air Command has to take autonomy seriously, not only are they falling behind, but making decisions which make no sense without ACP/CCAs. Image
All of our peers have invested in CCA/ACP programmes, including our GCAP partners and France, Australia, Sweden and Germany. Air command has not done more than spend nominal sums to keep the rhetoric alive. RAF is prioritising its desire for more crewed E7, F-35A and more A400M. Image
Over keeping ahead of the technological curve. This is a false economy and will have long term damaging effects on the UK defence industrial base if we have no capability to develop, manufacture and export ACP/CCAs in a market that will be dominated by these systems mid-century. Image
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More from @FennellJW

Jan 16
The Enfield P14 was the planned replacement for the Lee-Enfield SMLE in 1914. Designed from experience in the Boer War, it was intended to combine perceived advantages of the German Mauser cartridge and acton (greater accuracy and durability) with that of the SMLE (rapid fire). Image
The rifle was adapted from the P12-13 prototypes, which had been designed around the powerful Enfield .276 cartridge. Due to developmental problems with the cartridge and the onset of war in 1914, the rifle was adapted to fire the in-service .303 round as the P14. Image
During the Boer War, soldiers had noted the greater range and accuracy of the Mauser model 1895 used by Boer sharpshooters. Enfield decided to combine the more powerful Mauser-type round and action (used by both the Mauser and the US 1903 Springfield rifle) with the Lee-Enfield. Image
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Dec 30, 2025
Convoys from South Africa, India, Australia and South America to the UK formed up in Freetown's vast natural harbour before proceeding under escort to Gibraltar and Britain. These Defiant target-tugs were used to drill the merchantmen in anti aricraft fire before they departed.
Sloops carried out day-to-day flag waving and policing duties from all of the major colonial ports, and from 1916 had been built with a secondary capability for use as convoy escorts. This included the fitting of depth charge racks and the earliest form of sonar - ASDIC. Image
Convoy escort sloops had been built in large numbers during the Great War to a standard 'Flower-class' design based on a fleet minesweeper hull. But by 1939 most of these ships were worn out and had been scrapped, sold off or converted for RNR harbour duties. Image
Read 99 tweets
Dec 27, 2025
Britain is buying Sky Sentinel AI controlled C-UAS turrets for Ukraine. These Ukrainian systems use EW and a 12.7mm Browning M2 HMG and are extremely effective against subsonic drones like Shahed. 10-30 of the $150K turrets are needed to protect a city. militarnyi.com/en/news/sky-se…
Sky Sentinel uses 'foreign components' which suggests a UK-UKR collaboration in design and manufacture. AI controlled, they do not require indivdual operatators, but can be integrated with and operated as part of an IAMD systems from remote command posts. Image
Billed as the world's first full automated AI controlled air defence turret, it fills a gap to counter cheap $10-$30 drones where sophisticated longer-ranged systems like Sky Sabre, IRIS-T or NASAMS are overkill, and can be optimsied for use against more complex threats. Image
Read 4 tweets
Dec 25, 2025
A thread on rapid scaling of the Royal Navy using quick-build autonomous systems:

1SL Gen Gwyn Jenkins has endorsed this approach, following his 'uncrewed where possible' mantra, but understanding that uncrewed will augment rather than replace crewed capabilities. Image
This means building low-cost, attritibel uncrewed systems to the current technology levels, rather than high-risk bleeding edge capabilities. So using proven remote control and AI autonomy on fast-build platforms for escort, ISR, picket dury/outer layers and magazine depth. Image
Work is already proceeding on many of these capabilities, much of it funded by industry, but little has been fielded operationally. In the UK this includes the M-Subs Excailbur and BAES Herne XLUUVs, Helsing Fathom SG-1 ASW Wave Glider, ACUA 43m ASW MUSV & Leonardo Proteus RUAS. Image
Read 27 tweets
Dec 19, 2025
The STEN.

In 1940 Britain only porduced the heavy and complex Lanchester SMG, a copy of the 1920s German MP28. The Lanchester was designed for use by naval boarding parties and also issued to the the RAF Regiment. It was made of high quailty materials and expensive to produce. Image
Large numbers of Thompson SMGs were ordered from the United States in 1939, but supply could never meet demand, especially after the US entered the war in 1941. The Thompson was also expensive to produce and relatively complex. Image
In 1940 the Design Department at the Royal Arsenal at Woolwich and the Royal Small Arms Factory at Enfield worked tegether to develop a simplified mass-production weapon, based the the Lanchester's action, compatable with the Lanchester/MP 28 magazine and 9x19mm Parabellum round. Image
Read 18 tweets
Dec 11, 2025
Lets look at the Second Tactical Air Force (2 TAF) and how RAF air support for 21st Army Group was organised and delivered.

2TAF was built on lessons in close air support learned in the Mediterranean with the Desert Air Force (later renamed the First Tactical Air Force). Image
Formed in July 1943, command passed to Arthur Coningham in January 1944, the New Zelander who had led the Desert Air Force from 1941-43 and pioneered the use of forward air control, 'cab ranks' and the rapid construction of forward air strips behind advancing ground forces. Image
Three RAF 'Groups' were assigned to 2TAF. These were the equivalent of USAAF 'Conmands'. 83 Group and 84 Group were newly formed Fighter Groups, containing units detached from Fighter Command, and 2 Group comprised tactical light ad medium bombers detached from Bomber Command. Image
Read 22 tweets

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