Title: Penetrating projectile system and apparatus

Abstract: A projectile having a length to diameter ratio greater than 6 to 1 is propelled from a launcher by a propellant charge toward a rock target at velocities of 500 ft./sec. and higher to more efficiently penetrate the rock for excavation purposes.

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Inventors: Mohaupt, Henry H. (Santa Barbara, CA, US)

Application Number: 821465
Filing Date: 1977-08-03
Publication_date: 1978-11-07
Assignee:
Primary Class(es): 102/518 102/703, 175/2
Other Classes:
US Patent Ref:

2449571	Sep, 1948	Walker	89/14.
3302570	Feb, 1967	Marguardt	102/52.
3344711	Oct, 1967	Mawhinney et al.	102/92.
3370535	Feb, 1968	L'Permutter	102/52.
3412681	Nov, 1968	Schirneker	102/38.
3434425	Mar, 1969	Critcher	102/92.
3450050	Jun, 1969	Robinson	102/92.
3476048	Nov, 1969	Barr et al.	102/38.
3498222	Mar, 1970	Birkigt	102/52.
3515072	Jun, 1970	Barr	102/DIG.
3680485	Aug, 1972	Zaid et al.	102/92.
3714900	Feb, 1973	Feldmann	102/52.
3745926	Jul, 1973	Mertz et al.	102/DIG.
3880083	Apr, 1975	Wasserman et al.	102/92.
3902424	Sep, 1975	Dietsch et al.	102/DIG.

Other Refs: 663,288665,970

Aug, 1938	DE
Oct, 1938	DE

Primary Examiner: Brown, David H.
Assistant Examiner:
Attorney: