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November 21st, 2007, 15:32
| #1 |
| Senior Member  Join Date: Mar 2006
Posts: 336
|  Stupid Question Hey guys, I know I should know this but I was never taught this and am going to need to learn it eventually. But when recording tach time and time off the hobbs meter, how do you do the math to write it in the logbook. What im basically trying to say is how do you convert the time?
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November 21st, 2007, 15:35
| #2 |
| Old Skool  Join Date: Nov 2004 Location: People's Republic of Boulder
Posts: 2,084
| Re: Stupid Question Not sure exactly what you are asking but I will take a stab... 1) You usually record the hobbs times for your logbook. For example... 1.2 hours 2) The tach time is usually a function for maintenance only 3) If you are wondering how that breaks down to hours and minutes simply divide 60 minutes by 10 (for tenths of an hour). So 1.2 hours = 1 hour and 12 minutes. Each .1 is exactly 6 minutes. Is that what you were asking?
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November 21st, 2007, 15:51
| #3 |
| Old Skool  Join Date: Aug 2004 Location: CFI / CFII in PA
Posts: 2,509
| Re: Stupid Question if you are looking for a conversion factor between tach and hobbs, hobbs is around 1.25xtach time. the number varies however, because tach is based on revolutions - i.e if we fly the plane for 1 hour at 2700 rpm and 1 hour at 1500 rpm, the tach will indicate differently, even though it flew for 1 hr |
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November 21st, 2007, 15:57
| #4 |
| Old Skool  Join Date: Oct 2005 Location: KBOS
Posts: 2,534
   | Re: Stupid Question Just note your time prior to engine start and after engine shutdown. Convert to tenths.
__________________ Done.... |
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November 22nd, 2007, 01:58
| #5 |
| Old Skool  Join Date: Nov 2000 Location: Spokane, WA
Posts: 6,462
| Re: Stupid Question If your trying to convert tach time for the purpose of what to put in your log book, don't bother. You are legal to log time from when the wheels move for purpose of flight to when the wheels stop moving at the tiedown. You could use your watch to figure it out. There's nothing wrong with that.
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November 22nd, 2007, 02:02
| #6 |
| Old Skool  Join Date: Nov 2006 Location: Boca Raton, FL
Posts: 1,883
 | Re: Stupid Question I see what you are saying... I think you log the hobbs meter lets say you get in the plane. note it *lets say its 0408.7* you do your flight and check the hobbs meter again *it says 0409.9* you would log 1.2 in your logbook is that whatcya mean?
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November 22nd, 2007, 08:12
| #7 |
| Old Skool Join Date: Aug 2004 Location: CFI / CFII in PA
Posts: 2,509
| Re: Stupid Question yep |
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November 22nd, 2007, 09:57
| #8 |
| Senior Member Join Date: Mar 2006
Posts: 336
| Re: Stupid Question Thanks everyone for answering my question.
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January 18th, 2008, 22:48
| #9 |
| Senior Member Join Date: Mar 2006
Posts: 336
| Re: Stupid Question Sorry to bring back an old thread , but someone told me that I could subtract the hobb or tach time at the end from what I started out with and it would give me the answer, is that true?
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January 18th, 2008, 22:59
| #10 | |
| Old Skool  Join Date: Jul 2004 Location: Wisconsin
Posts: 2,592
| Re: Stupid Question Quote:
After the flight, note the hobbs time again. Now, subtract the first reading from the second.
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January 18th, 2008, 23:14
| #11 |
| Senior Member Join Date: Mar 2006
Posts: 336
| Re: Stupid Question Sweet! thanks!
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January 19th, 2008, 00:08
| #12 |
| Junior Member  Join Date: Dec 2004 Location: work DEN, live SEA
Posts: 73
| Re: Stupid Question I'm sorry but you are all wrong. You need to to take the hobbs time and double it, then add that to tach time. take that number, add 6 approaches, holding, 5 hrs actual, and put it in the multi column. hope that helps
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January 19th, 2008, 02:05
| #13 |
| Senior Member  | Re: Stupid Question Who the hell is your CFI? Isnt he/she filling out your logbook and signing it?!?!?! -Rob
__________________ CFI - MEI http://robertstogsdill.flyblog.com "Yea, the guy with the $4000 suit is going to hold the elevator for the guy that doesnt even make that in 3 months. COME ON!" - Gob Bluth |
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January 19th, 2008, 02:09
| #14 | |
| Senior Member  Join Date: May 2005 Location: at work
Posts: 909
 | Re: Stupid Question Quote:
__________________ Commercial Pilot, CE-500 Gold Seal CFI.II.MEI IGI Future GoJet Pilot.  | |
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January 19th, 2008, 02:13
| #15 | |
| Senior Member | Re: Stupid Question Quote:
ATP does spit out some of the most retarded CFIs. Me for example.... -Rob
__________________ CFI - MEI http://robertstogsdill.flyblog.com "Yea, the guy with the $4000 suit is going to hold the elevator for the guy that doesnt even make that in 3 months. COME ON!" - Gob Bluth | |
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January 19th, 2008, 05:42
| #16 | |
| Old Skool  | Re: Stupid Question Quote:
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January 19th, 2008, 06:30
| #17 | ||
| Senior Member Join Date: Oct 2007 Location: Ohio
Posts: 625
| Re: Stupid Question Quote:
Quote:
-mini | ||
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January 19th, 2008, 08:54
| #18 | |
| Senior Member  Join Date: Feb 2007 Location: Hawthorne Suites
Posts: 903
| Re: Stupid Question Quote:
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January 19th, 2008, 11:15
| #19 | |
| Old Skool Join Date: Jul 2004 Location: Wisconsin
Posts: 2,592
| Re: Stupid Question Quote:
__________________ "Who'd you give it to? Where's the meat?" | |
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