Condign volumes 1 to 3

Read from the scan by GLM-OCR; expect the odd misread word.

# UNCLASSIFIED

UK RESTRICTED

air breathing engine'. The PDE uses microwave-supported detonation to heat the air working fluid and is based on what, in principle, is the airbreathing ramjet. A combined cycle engine (i.e. air-breathing and rocket) might be envisaged for a transatmospheric role. Clearly this would only operate in the atmosphere and velocities of Mach 5-6 are claimed to be possible without an air spike. [Hence, to return to the possible 'UAP' similarities this type of craft could not be extra-terrestrial unless it used another type of propulsion outside the atmosphere] Another endoatmospheric option is the MagnetoHydro Dynamic Fanjet (MHDF), where powerful Lorentz body forces are exerted on external air working fluid. In effect the active microwave-powered 'armature' accelerate the passive 'field coil' - which is the air channel used for momentum exchange.

(e) Rectenna For microwave on-board collection an off-board source must exist. [In the UAP context there has been no detectable source on earth or from space which, using conventional EM-waves at any wavelength someone on earth would have surely intercepted; especially in view of the huge power requirements].

30. There are several other key factors in the completion of the design, for example the production of a heatshield (if re-entry is required), artificial gravity, aerodynamic stability and control, plasma radiation shield (hazardous radiations), life support, and communications. [It is, however, seen that even this vehicle, if possible with today's technology, would be unlikely to achieve the characteristics attributed to UAP events]. It is of interest that the conceptual body shapes tend to be saucer-like. This is probably pure co-incidence - as many

UAP events reported are, in fact, not necessarily 'saucer shaped!!

## SUMMARY -PROPULSION OPTIONS

31. Propulsion mode is the key factor in considering whether it would:

(a) Be possible to construct a vehicle with reported UAP attributes and potentially (until proved otherwise) with an extra-terrestrial capability, using existing 'earth' technology.

(b) Be possible to conceive such a craft which can move with zero or near-zero sound and change the direction of movement almost instantly.

## CONCLUSIONS

32. In attempting to explore the potential technologies which would be essential in order to construct a craft with the exceptional characteristics, attributed to UAP it is important to note that:

- No reliable report exists of a landing and take-off of an object known to contain 'beings'.

- No spacecraft or occupants can be seen anywhere on earth and not even small artifacts have been left on earth to confirm the existence of a 'spacecraft' in the form of metals or other materials. None have apparently ever crashed, despite sighting reports for thousands of years.

- There is no evidence of attempts at communication between the alleged occupants of the 'craft' and humans or messages/items left behind as a form of communication. There is no evidence that any nation has a current capability to produce and trap anti-matter for propulsion purposes.

33. Hence, there are no new technologies or methods which could be exploited beyond those already known or being researched. There have been no