Stratospheric Platforms Limited (SPL) / World Mobile Stratospheric
Table of Contents

⚠ Disclaimer: This entry may be incomplete, out of date, or inaccurate. It is AI-maintained on a best-effort basis. Do not rely on it as a sole source — verify claims independently using the sources listed below.

Summary

Stratospheric Platforms Limited (SPL) was a Cambridge, UK-founded company (2014) developing an uncrewed, hydrogen-powered stratospheric aircraft carrying a large phased-array antenna to deliver direct-to-handset 5G coverage. In August 2025, SPL was acquired by World Mobile (a London-headquartered, blockchain-based telecom operator) and Protelindo (Indonesia’s largest tower company) and now operates as World Mobile Stratospheric (WMS), a joint venture that inherited SPL’s IP, engineering team and hydrogen-aircraft program. WMS is currently flight-testing its phased-array antenna on a modified Britten-Norman Islander aircraft, with tests scheduled to begin mid-2026, ahead of a planned prototype “Stratomast” stratospheric aircraft test in late 2027.

Key Facts

  • Original company: Stratospheric Platforms Limited (SPL), founded 2014, headquartered in Cambridge, UK.
  • Current status: SPL was acquired by World Mobile and Protelindo in a joint acquisition announced August 8, 2025; the resulting entity, World Mobile Stratospheric (WMS), is headquartered in London (per World Mobile’s own HQ location) and continues SPL’s hydrogen-aircraft program under new ownership.
  • Type: Joint venture between World Mobile Group (blockchain-based telecom operator) and PT Profesional Telekomunikasi Indonesia (Protelindo, Indonesia’s largest telecom tower operator, part of Sinar Mas Group).
  • Propulsion: Confirmed as hydrogen — specifically liquid hydrogen fuel cells, not solar-electric. This has been consistent since SPL’s original 2020 public unveiling through WMS’s 2025-2026 communications.
  • Key metrics (design/target, largely not yet flight-demonstrated at full scale): Coverage of up to 15,000 sq km per aircraft; phased-array antenna with 2,048 elements generating up to 450 steerable beams; target bandwidth up to 200-450 Mbps depending on source; support for up to 500,000 simultaneous direct-to-handset connections per aircraft.
  • Flight testing: WMS acquired a Britten-Norman BN2T-4S Islander aircraft (announced November 2025) to trial a scaled-down phased-array antenna; flight testing scheduled to begin mid-2026 in cooperation with BT at Adastral Park, UK. A full prototype “Stratomast” stratospheric aircraft test is separately reported as targeted for late 2027.

What It Is / How It Works

SPL’s original concept, unveiled publicly in October 2020, was a hydrogen fuel-cell-powered, remotely piloted aircraft designed to operate as a “telecoms mast in the stratosphere” — flying at roughly 45,000 feet (about 14km) and carrying a large phased-array antenna to deliver 4G/5G coverage directly to standard smartphones, integrated with existing terrestrial mobile networks. Deutsche Telekom was SPL’s largest shareholder, technology partner and launch customer during this period; a 2020 demonstration in Bavaria using a remotely piloted H3 Grob 520 aircraft linked a live LTE call and data session into Deutsche Telekom’s terrestrial network, with the company reporting download speeds of 70 Mbps and upload speeds of 23 Mbps over a 10 MHz test channel.

The core technical proposition — a phased-array antenna capable of steering hundreds of independent beams to serve mobile handsets without any special ground equipment — has carried through unchanged since. Under World Mobile Stratospheric, the antenna is described as a roughly 3-metre-wide array with 2,048 elements producing up to 450 individually steerable beams, each corresponding to a discrete coverage cell that AI-based software keeps geographically fixed on the ground even as the aircraft moves. The company frames the stratospheric band (roughly 60,000-70,000 feet) as uniquely stable — above jet-stream turbulence and most weather — making it possible for a single aircraft to hold a stationary service footprint over a wide area (WMS states up to 15,000 sq km per aircraft, equivalent to roughly 450-500 terrestrial towers) with latency much closer to a terrestrial network than to a satellite constellation.

SPL’s ownership and financing evolved over roughly a decade. It operated quietly from around 2015, backed principally by Deutsche Telekom, before its 2020 public unveiling. It went on to conduct additional demonstrations, including a 2022 5G HAPS trial in Saudi Arabia and a UK trial with BT, and in February 2023 took an investment from Protelindo, which was explicitly framed as exploring a HAPS solution for Indonesia’s dispersed-island geography. That Protelindo relationship deepened into the August 2025 joint acquisition of SPL by World Mobile and Protelindo, which folded SPL’s IP, engineering team, and hydrogen-aircraft development into a new joint venture, World Mobile Stratospheric. World Mobile’s own business model layers on top of the aircraft: WMS aircraft are described as providing high-altitude backhaul to World Mobile’s ground-based “AirNode” network, with traffic and value transfer routed through World Mobile’s blockchain-based “World Mobile Chain” and its WMTx token.

Notable Developments

  • February 2026: World Mobile Stratospheric joined the HAPS Alliance, the international industry coalition (whose members include SoftBank, T-Mobile, Aerostar, Nokia, Airbus and Ericsson) that works on HAPS spectrum policy, regulatory frameworks and interoperability standards.
  • January 2026: MIT Technology Review reported that World Mobile (headquartered in London) plans to flight-test its phased-array antenna in 2026, targeting 200 Mbps bandwidth and coverage for 500,000 simultaneous users over 15,000 sq km per aircraft; the article separately reported a Stratomast prototype test with Protelindo scheduled for late 2027, and quoted WMS CEO Richard Deakin’s estimate that nine Stratomasts could supply all of Scotland with connectivity for about £40 million ($54 million) a year.
  • November 2025: World Mobile Stratospheric acquired a Britten-Norman BN2T-4S Islander aircraft to carry a scaled-down version of the phased-array antenna for real-world flight testing; testing was announced to begin mid-2026, in cooperation with BT at BT’s Adastral Park research site near Ipswich, UK.
  • August 2025: World Mobile and Protelindo jointly announced the acquisition of Stratospheric Platforms Limited, launching World Mobile Stratospheric (WMS) as the entity carrying forward SPL’s decade-plus of hydrogen-aircraft and phased-array-antenna development. World Mobile’s messaging described prior demonstration flights conducted with BT (UK), Deutsche Telekom (Germany), and unnamed Middle East operators as validating the underlying technology before the acquisition.
  • February 2023: SPL announced a strategic investment and partnership from Protelindo (Indonesia’s largest telecom tower operator), aimed at exploring a HAPS solution for Indonesia’s island geography; SPL CEO Richard Deakin was quoted describing plans to move toward a “production standard hydrogen-powered aircraft and full-service roll-out.”
  • March 2022: SPL conducted a HAPS 5G trial in Saudi Arabia, flying at roughly 45,000 ft and connecting to a standard smartphone (per DataCenterDynamics reporting); SPL also announced a UK trial with BT around this period.
  • October 2020: SPL publicly unveiled itself and, working with Deutsche Telekom (its largest shareholder, technology partner and launch customer at the time), announced what it described as the world’s first demonstration of high-speed LTE/4G data and voice connectivity from a remotely piloted stratospheric aircraft integrated into a live terrestrial telecom network, conducted in Bavaria, Germany.
  • 2014-2016: SPL was founded in Cambridge, UK (2014); Deutsche Telekom became a major investor in 2016, backing roughly five years of quiet pre-launch development.

Key People

Richard Deakin — Chief Executive Officer, World Mobile Stratospheric (continuing in this role from his prior position as CEO of Stratospheric Platforms Limited) LinkedIn: https://www.linkedin.com/in/rdeakin/ (URL identified via search; not independently fetched this session). Previous roles: CEO, Stratospheric Platforms Limited (through the August 2025 acquisition); CEO, NATS (UK air traffic control provider, 2010-2015); senior positions at BAE Systems, Thales Air Systems Division (formerly Thales Air Defence), and GKN, with a career focus on civil/defense aerospace and unmanned systems. Chartered Engineer and Fellow of the Royal Aeronautical Society; first-class degree in Aeronautical Engineering (Kingston University), MBA (Cranfield School of Management), honorary doctorate in engineering (Kingston University). ⚑ Overlap: Extensive prior aerospace/defense career at Thales Air Systems Division and BAE Systems — both major players in the broader aerospace and defense-electronics space adjacent to HALE/HAPS — as well as air traffic management at NATS, directly relevant to stratospheric aircraft airspace integration.

Gregory Gottlieb — Head of Aerial Platforms, World Mobile (leads both the earlier aerostat program and the current WMS aircraft program) LinkedIn: https://ae.linkedin.com/in/gregorygottlieb (identified via search; not independently fetched this session). Previous roles: Per World Mobile’s own published interview, a 20-year British Army career (through 1998, latterly as the UK Ministry of Defence officer responsible for counter-terrorism and special-forces aviation equipment requirements), followed by four years in a senior corporate role at a German aerospace-and-logistics group, then work for/with Boeing, EADS, DARPA and US TRANSCOM as a subject-matter expert on airship and aerostat technology and operations. ⚑ Overlap: Extensive cross-industry lighter-than-air and unmanned-systems background (Boeing, EADS — Airbus’s predecessor — DARPA, US TRANSCOM) prior to joining World Mobile, spanning airships and aerostats broadly rather than any single named HALE/HAPS competitor.

Micky Watkins — Founder and CEO, World Mobile Group (parent of the WMS joint venture) LinkedIn: https://uk.linkedin.com/in/micky-mr-telecom-watkins-a17b5b4b (identified via search; not independently fetched this session). Previous roles: Founder, Yallo (an early VoIP platform); telecom entrepreneur with a reported decade-plus background in mobile connectivity business models prior to founding World Mobile Group in 2018. ⚑ Overlap: No HALE/HAPS-specific prior employer identified; his relevant background is telecom/VoIP entrepreneurship rather than aerospace.

People — Last Reviewed: 2026-08-03

Claim Verification

Claim: SPL’s aircraft is hydrogen-powered (specifically liquid hydrogen fuel cells), not solar-electric. Status: Verified Supporting sources: sUAS News, republishing SPL’s own October 2020 press release describing “a hydrogen fuel-cell powered, long-endurance platform” (fetched); World Mobile’s own August 2025 and November 2025 posts describing “the world’s first hydrogen-powered, sustainable, fixed-wing aircraft” and “liquid hydrogen” propulsion (fetched); MIT Technology Review’s January 2026 independent reporting describing World Mobile’s “hydrogen-powered high-altitude UAV” (fetched). Refuting/questioning sources: None found. Summary: Every source reviewed, from SPL’s original 2020 unveiling through WMS’s 2025-2026 communications and independent trade press, consistently describes hydrogen (not solar) propulsion.

Claim: World Mobile and Protelindo jointly acquired Stratospheric Platforms Limited in August 2025, forming World Mobile Stratospheric. Status: Verified Supporting sources: World Mobile’s own announcement post, dated August 8, 2025 (fetched), stating WMS “inherits over a decade of development from the former Stratospheric Platforms Ltd. (SPL), including the platform’s intellectual property and the engineering team behind it”; independent trade coverage from TelcoTitans (“DT’s HAPS interest taken over by wireless infra pair,” fetched, partial/paywalled) corroborating the acquisition and naming World Mobile and Protelindo. Refuting/questioning sources: None found. Summary: Directly confirmed by World Mobile’s own detailed announcement and corroborated by independent telecom trade press; SPL’s own former website (stratosphericplatforms.com) now redirects to World Mobile Stratospheric’s site (wmstratospheric.com), which is itself consistent with the acquisition.

Claim: The phased-array antenna and aircraft can serve up to 500,000 simultaneous direct-to-handset connections over 15,000 sq km per aircraft. Status: Partially verified Supporting sources: World Mobile’s own August 2025 and November 2025 posts (fetched), repeating this figure; MIT Technology Review’s January 2026 independent report (fetched), which repeats the same 15,000 sq km and 500,000-user figures while citing World Mobile as the source. Refuting/questioning sources: None found, but no fully independent (non-company-sourced) verification of the 500,000-user or 15,000 sq km figures was found — MIT Technology Review’s figures trace back to World Mobile’s own claims rather than an independent measurement or flight test, and no full-scale stratospheric flight of the WMS aircraft has yet occurred. Summary: These are company-stated design targets repeated consistently across WMS’s own materials and picked up by independent press, but they remain unverified by independent flight testing since the aircraft has not yet flown at full stratospheric altitude under the new WMS program.

Claim: WMS flight testing with the Britten-Norman Islander is scheduled to begin mid-2026, ahead of a full Stratomast prototype test in late 2027. Status: Partially verified Supporting sources: World Mobile’s own November 2025 and February 2026 posts (fetched) state Islander flight testing begins mid-2026; MIT Technology Review (fetched) separately reports a Protelindo-partnered Stratomast prototype test “scheduled to begin in late 2027.” Refuting/questioning sources: None found, but these are forward-looking company/reported timelines that had not yet occurred as of this entry’s last review date, and SPL’s predecessor program has a history of earlier stated targets (e.g., a 2020 unveiling that described a 2024 operational-deployment aim) not being met on schedule. Summary: Both dates are corroborated by company statements and independent tech press, but neither had occurred as of this review, and the predecessor company’s history of shifting timelines (see Notable Developments) is a relevant caveat.

Sources

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