Radius Engineering Inc. has a long history of developing various shelter systems to protect people from natural and man-made disasters.

• 1978 Underground shelters are made from concrete structures. Designs were used from the government agencies, which were very crude and very poorly engineered due to lack of government funding for civil defense.
• 1983 After experience with existing designs and technology, Walton McCarthy receives private funding to write The Nuclear Shelterist, Todd and Honeywell, NY. This book was aimed at helping people build their own shelters.
• 1984 After realizing the shortcomings of concrete in water tightness and construction time, underground shelters were made from steel tanks and retrofitted with life support systems.
• 1985 Underground shelters continued to be made from steel tanks and pipe culverts. Numerous anti-corrosion systems were experimented with using cathodic protection and fiberglass coatings.

• 1988 Underground shelters are designed and made from fiberglass in paraboloid shape. The Nuclear Shelterist is replaced with PRINCIPLES OF PROTECTION, The US Standard Handbook of NBC Weapon Fundamentals and Shelter Engineering Design Standards.
• 1989 The first TBC6 fiberglass paraboloid was manufactured. This design was aimed at creating a shelter that is watertight, does not fail catastrophically like cylinders, does not suffer from corrosion and consequently does not require de-rating its pressure rating each year due to corrosion. U.S. Patent No. 4,660,334
• 1989 The Underground shelter ES10 fiberglass elongated spheroid was manufactured. The Second Edition of PRINCIPLES OF PROTECTION, The US Standard Handbook of NBC Weapon Fundamentals and Shelter Engineering Design Standards is printed.

• 1994 Underground fiberglass shelters P10, P6, TR6 are manufactured with numerous improvements. The S.C.U.P.P. (Self Contained Underground Power Plant) is developed. Patent pending. Combat CompositeTM is developed and successfully tested to resist gunfire and fire. Patent Pending.
• 1996 Underground fiberglass shelters P10, P6, TR6, TR6S, and Earthcom 18 earth bermed arch is manufactured.

• 1998 The fiberglass NBC Lifecell (Multi-Chamber Air Sterilization) is developed for purifying air inside one room in a conventional house plus light and communications for a two-week period. This is the first attempt to provide low cost emergency protection for the homeowner against nuclear, chemical, and biological warfare. U.S. Patent No. 6,296.693 B1
• 2001 The VP6 first fiberglass vertical paraboloid is manufactured to meet market need for chemical and biological warfare agent protection. The VP6 is later redesigned to provide limited protection from nuclear warfare. Patent Pending.
• 2002 The Fifth Edition of PRINCIPLES OF PROTECTION, The US Standard Handbook of NBC Weapon Fundamentals and Shelter Engineering Design Standards is released and distributed by The American Civil Defense Association.

For more information please contact Walton McCarthy here