Sometime around the early 1990 s the people who get excited about such things got excited about donuts on a rope contrails which many assumed were the results of pulse detonation engines powering hypersonic aurora spyplanes.
													
																	Donuts on a rope contrail. 
									
	
		
	
																	Or black programs may notice that the center section of the contrail is extremely similar to the famous doughnuts on a rope contrail. 
																	There are many photos of strange contrails shown. 
																	Donut on a rope contrails are they made by normal jet aircraft or secret black programs. 
																	Well after studying the now famous contrail photographed by steve douglass some years ago now i decided to see if these vapour trails were made just by secret aircraft or possibly normal jet engined aircraft such as fast jets and airliners. 
															
													
									
	
		
	
																	More than a decade ago cotton ball like contrails were spotted and photographed periodically by observers throughout the u s but reports had dropped off sharply in recent years aw st may 11 1992 p. 
																	Aurora was a rumored mid 1980s american reconnaissance aircraft there is no substantial evidence that it was ever built or flown and it has been termed a myth. 
																	Donuts on a rope contrails produced by an unknown high speed high altitude aircraft have been reported throughout the u s. 
																	Its distinctive donuts on a rope contrail was spotted recently above utah s wasatch mountains. 
															
													
									
	
		
	
																	And europe suggesting that the classified pulser is no longer. 
																	They clearly are not the same contrail then i read an article i think on wikipedia about aurora. 
																	Of course it turned out that these contrails if you actually traced them to their sources were being left. 
																	I was browsing ebay and a model sr 91 aurora showed up. 
															
													
									
	
		
	
																	I went to the web looking for donuts on a rope. 
																	Aurora spy plane ion propulsion.