Clean Tent – Used for Car’s Rocket Engine Rebuild

The Bloodhound Rocket (Image Credit: Stefan Marjoram / Clean Environments)

Table of Contents

The Brief
The Solution
On Site
In Operation

The Brief

The Bloodhound SSC rocket team approached Clean Environments as they were seeking a sizable temporary cleanroom protect the hybrid rocket pump system of the car from external contaminants while it was stripped down and deep cleaned, ready for testing in Norway.

The Solution

The objectives of the Bloodhound project were exciting and ambitious, and the educational aspect appealed to Clean Environments’ own aspirations. Hence, Clean Environments agreed to sponsor the project that aimed to:

  • Set a new world land speed record of 1,000 mph
  • Inspire the next generation on science, technology, engineering, and mathematics
  • Share an iconic research and development program with a global audience

Since speed and portability were the crucial factors, Clean Environments lent a CT 1700 to the Bloodhound team. Clean Tent is a cleanroom that can be stripped down to its fundamental parts, making it unique in the market as the most portable cleanroom in the world. The CT 1700 variant is the largest of the three Clean Tent models with dimensions of 6.1 m x 3.65 m.

All Clean Tents feature:

  • An integral air lock/ gowning room
  • A G4 prefilter, air box, and H14 HEPA filtration
  • Clear walls to the main body of the workroom maximizing the available ambient light
  • A ground sheet which seals to the top section providing a completely sealed envelope that prevents any particulate ingress

On Site

The CT 1700 cleanroom packs into four small bags and therefore can be easily fit into a family estate car, and needs just two people for a quick installation.

The Bloodhound SSC rocket team operates from a section of the Bloodhound Technical Centre, a large portal framed industrial unit in Bristol. Like many industrial units, the Bloodhound Technical Centre has many external doors and an unsealed concrete floor. Since the rocket team is positioned next to the engineering team, swarf and other airborne particulates are in close proximity.

Since the Clean Tent is a completely sealed envelope, Clean Environments was able to install the Clean Tent in this environment and, following a wipe down, the area was certified to ISO 14644-1 ISO class 6 within a day. The cleanroom successfully cleared all of the customer requirements in subsequent operation testing.

In Operation

Clean Environments has followed the progress of the engine system advancements closely. The test fire of the Rocket at Aerohub, Newquay Cornwall Airport, showed that the new auxiliary power unit – A 550 bhp Jaguar supercharged V8 engine – has proved to be the ideal oxidizer pump owing to its simplicity and reliability. The unit can supply 800 L of high test peroxide (HTP) to the rocket within in 20 seconds.

Once the Clean Tent deep clean was over, tests on the Falcon Hybrid Rocket Motor were completed at the Nammo Test Centre in Norway by the rocket team. The test results initially proved the concept of using an internal combustion engine to pump oxidizer into the rocket in the car but they proved to be more important than expected as the test results lead to a design change.

For the 800 mph runs, the car will now feature a single monopropellant rocket, whereas a cluster of three hybrid rockets will be used in the 1,000-mph car. These will be placed at the rear of the car, below the Eurojet EJ200 jet engine.

In October 2017, the 200 mph testing of the car was successfully completed using the Eurojet EJ200 jet engine in Cornwall. The team is on schedule to break the 1,000 mph barrier and set a new world land speed record at Hakskeen Pan, South Africa, in late 2018.


Toni Horsfield, Head of Clean Environment division at Moorfield said:

We are proud to be playing a role in this exciting project. Even the slightest contamination can adversely affect the performance and safety of the rocket-powered engine. The Bloodhound SSC rocket team needed a fast solution to their temporary cleanroom requirement which is exactly what the Clean Tent is designed for. We were able to deliver, install and certify the space to ISO 6 within a day.

Toni Horsfield, Moorfield Nanotechnology


To see details of The Bloodhound project please visit:

This information has been sourced, reviewed and adapted from materials provided by Clean Environments.

For more information on this source, please visit Clean Environments.

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