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		| Paper: | 
		Modeling Helical Structures in Relativistic Jets | 
	 
	
		| Volume: | 
		340, Future Directions in High Resolution Astronomy: The 10th Anniversary of the VLBA | 
	 
	
		| Page: | 
		92 | 
	 
	
		| Authors: | 
		Hardee, P.E.; Walker, R.C. | 
	 
	
	
		| Abstract: | 
		The superluminal motions of helical jet structures can be used to place limits on sound speeds in the jet and surrounding cocoon. | 
	 
	
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