Bruce Bell, Back in Feb of 1995 you talked about having a spreadsheet that would estimate HP based on time to accelerate from one speed to the next. The ftp site you posted, "ftp.csn.net/bbell_assoc/rdhp.xls" no longer seems to work. Do you still have that spreadsheet around? If so, is there anyway I can talk you out of a copy? or a description of the method? Thanks, Bob