DBCOOPER 1 #1 October 13, 2003 Got a log book and a half where I haven't added up freefall time.Looking for a formula where I could just enter altitude it would calculate timeReplying to: Re: Stall On Jump Run Emergency Procedure? by billvon If the plane is unrecoverable then exiting is a very very good idea. Quote Share this post Link to post Share on other sites
lazyfrog 0 #2 October 13, 2003 would work if you always fall at the same speed... or if you'd like to have a"standard according to altitude", you can do a conditionnal formula like : if altitude =13000 ft then time =1---------- Fumer tue, péter pue ------------- ourson #10, Mosquito Uno, CBT 579 Quote Share this post Link to post Share on other sites
testpilot 0 #3 October 13, 2003 How about giving me the calculation and I'll come up with a formula. Say A is altitude, what do I do with a to get freefall time. Dave D830 http://www.skydiving.co.za Quote Share this post Link to post Share on other sites
nacmacfeegle 0 #4 October 13, 2003 something like this...? http://www.dropzone.com/files/ffcalc20.zip-------------------- He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me. Thomas Jefferson Quote Share this post Link to post Share on other sites
testpilot 0 #5 October 13, 2003 Nice, but the calculations are hidden away. I need the calculations not the answers. Dave D830 http://www.skydiving.co.za Quote Share this post Link to post Share on other sites
nacmacfeegle 0 #6 October 13, 2003 Pah, pooters, I fly em, I don't fix em... check the 'about' tab the author's e-mail is there, and he says he will give you the 'source code'. I'll look for the back up calc stuff somewhere else meantime. I'm sure its been posted.I'm sure I have a wee note in my log book about delays from various alts up to terminal.....-------------------- He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me. Thomas Jefferson Quote Share this post Link to post Share on other sites
DBCOOPER 1 #7 October 13, 2003 What I wanted to do was something like this. Jump #...Exit......Time.......Previous total .........................................2:30:15 200.........13.5.......X.............2:31:27 201.........14..........X.............2:32:42 Where the only thing that I would have to enter would be the exit value.Every thing else would be a formula.Replying to: Re: Stall On Jump Run Emergency Procedure? by billvon If the plane is unrecoverable then exiting is a very very good idea. Quote Share this post Link to post Share on other sites
pilotdave 0 #8 October 13, 2003 Really quick estimate based on 6 seconds per 1000 feet of freefall. You could easily turn some constants into variables to get a better estimate for each jump.... =[(Exit Altitude)-(Opening Altitude)]*6/1000 Just replace the altitudes as i wrote them with labels to the cells containing those numbers (or just change opening altitude to whatever altitude you normally pull at). So, if you exit at 13,000, open at 3000, you get: [(13000 - 3000)*6]/1000 = 60 seconds. To convert seconds to hours:minutes:seconds you'll have to get fancier but i'm sure excel has a built in function for that. Dave Quote Share this post Link to post Share on other sites
encinoadam 0 #9 October 13, 2003 Well, PilotDave beat me.... but I was close. Mine ought to work, including taking values of zero into account. It also doesn't calculate freefall into minutes and seconds (just seconds), but hey, it is 5:30am. ac Quote Share this post Link to post Share on other sites
pilotdave 0 #10 October 13, 2003 I try to never jump from an altitude of zero...or at least i dont count it toward freefall time. Dave Quote Share this post Link to post Share on other sites
2fat2fly 0 #11 October 13, 2003 Do you always open at 3K? Of course it's simple to replace the 3000 in your formula with the cell that has opening altitude. Good work.I am not the man. But the man knows my name...and he's worried Quote Share this post Link to post Share on other sites
encinoadam 0 #12 October 13, 2003 I frequently open at other altitudes. But, DB's request was a formula where he could just enter exit alti. Adding deployment alti would be easy. And jumping from zero... not so much fun. I added the condition to prevent the negative numbers resulting from having a zero or null response to exit altitude. Otherwise, accumulated freefall time would have numbers subtracted from it on jumps that you had not yet entered. Capiche? Still trying to figure out a way to have it properly calculate time. But, I have to get to work. And, there isn't anything fun about not working, either. ac Quote Share this post Link to post Share on other sites
chopchop 0 #13 October 13, 2003 speaking of excel spreadsheets.. here is a sheet I made that keeps track of how many jumps at each dz, on which canopy, per year, what date for each 00 jump, how many days per hundred jumps and how long in the sport.. oh yeah and when my next repack is due.. yep.. I'm a dork. chopchop gotta go... Plaything needs a spanking.. Lotsa Pictures Quote Share this post Link to post Share on other sites
DBCOOPER 1 #14 October 13, 2003 Here is what I've come up with so far. =(D3-3)*6+6 Where D3 = exit altitude i.e. 13.5 minus 3 for 3000 deployment times 6 seconds per thousand plus 6 seconds for the first 1000 feet to accelerate. In order to make it not calculate into negative numbers on the totals I just entered 2 as exit altitude in all of the jumps not entered. I can only get the total time in tenths of a minute totals will be minutes and tenths of a minute.Replying to: Re: Stall On Jump Run Emergency Procedure? by billvon If the plane is unrecoverable then exiting is a very very good idea. Quote Share this post Link to post Share on other sites
