Hi Dana Frank, to your punching bag. Have you considered using an airbag acceleration sensor? Are they too expensive or to direction-sensitive? Bye Frieder -- ; Frieder Ferlemann ; Institut fuer Umweltphysik ; Im Neuenheimer Feld 366, Zi 410 ; D-69120 Heidelberg ; Tel.: 06221 546385 oder 546334 <-- New(improved) Number ; Fax: 06221 546405 <-- New(improved) Number ; ; Email: FE@uphys1.uphys.uni-heidelberg.de ; ; To be scanned by BundesNachrichtenDienst: embargo, G3, 7.62, stinger