I don't think my earlier posts made it through, so I'm reposting this
information:
The Arcas and Super Arcas Sounding rockets used a piston launch system.
Design information is available at:
DEVELOPMENT OF THE ARCAS ROCKETSONDE SYSTEM
https://archive.org/details/DTIC_AD0235341
DEVELOPMENT OF THE FRANGIBLE ARCAS METEOROLOGICAL ROCKET VEHICLE
http://www.dtic.mil/docs/citations/AD0630932
FABRICATION AND DELIVERY OF ARCAS SOUNDING ROCKET SYSTEMS EX 6 MOD 0 AND EX 6
MOD 1
http://www.dtic.mil/docs/citations/AD0437681
Other material is also at DTIC
