Most of the 216,000 tonnes of emissions per year came from the making of parts, wind-tunnel testing and transporting the teams.

No flight or wind-tunnel testing of the design was performed before production began.

Over 1,000 hours of wind-tunnel testing were performed.

The swiveling funnels of had not proved successful and wind-tunnel testing had not provided an answer.

Following wind-tunnel testing of the ramjet and the coal basket, modifications were incorporated to provide more efficient combustion.