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Hobbs Meter

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ChangDriver

Joined: 15 Sep 2007
Posts: 266

Posted: Thu Dec 03, 2009 11:40 am Post subject: Hobbs Meter

I am interested in changing how the Hobbs meter in my plane is wired (it is currently wired to the radio master - not the best place for it) and don't want to install an oil pressure switch.  I know I read in the EAA magazine many months back of alternative ways of doing so, but can't find the article.



What other ways have been done?  I think the writer of the EAA article used the field for the alternator.



Any suggestions?



Craig

longg(at)pjm.com
Guest

Posted: Thu Dec 03, 2009 12:03 pm Post subject: Hobbs Meter

Craig,



Go wireless. There are units available now that work on vibration. No

fussing about with wires. BTW - I have an old wired job if someone wants

a challenge. New in box. Free for asking but don't let me see it on

eBay. If you don't have a need for it right now, don't ask.



Glenn



--

BobsV35B(at)aol.com
Guest

Posted: Thu Dec 03, 2009 12:25 pm Post subject: Hobbs Meter

Good Afternoon Craig,

  

 It all depends on what you want to record. 

  

 For a certificated flying machine, the FAA only requires that we log the  actual flying time. Taxiing to the gas pumps, maintenance runups, and taxiing to  the runway do not have to be recorded. If you want to use the time for pilot  logging purposes, all time from the time when the engine is started for the  purpose of flight to the engine shut down following a flight counts. Kinda  tricky if you want to taxi to the gas pump without logging time!

  

 The easiest way to get only flight time is with a ground reference strut  switch. 

  

 Another suitable method is with an air pressure operated switch in the  pitot line  Some folks use a simple air operated vane on a strut, wing,  belly, or elsewhere

  

 We formerly operated a fleet of Helicopters. For maintenance purposes, we  had a Hobbs hooked up to a switch on the collective, It only recorded time when  the collective was off the stop. For charging the customer, we had a Hobbs on  the Master switch. It recorded time from the moment the master switch went on  until it was turned off.

  

 As Always, It All Depends! <G>

  

 Happy Skies,

  

 Old Bob

 AKA' Bob Siegfried

 Downers Grove, Illinois

 Stearman N3977A

  

  In a message dated 12/3/2009 1:42:57 P.M. Central Standard Time,  capav8r(at)gmail.com writes:

  	  Quote: 	
		  -->    AeroElectric-List message posted by: "Craig Winkelmann"    <capav8r(at)gmail.com>



I am interested in changing how the Hobbs    meter in my plane is wired (it is currently wired to the radio master - not    the best place for it) and don't want to install an oil pressure switch.     I know I read in the EAA magazine many months back of alternative ways of    doing so, but can't find the article.



What other ways have been    done?  I think the writer of the EAA article used the field for the    alternator.



Any suggestions?



Craig





Read this    topic online    here:



http://forums.matronics.com/viewtopic.php?p=276010#276010===============================================

_nbsp;             (And Get Some AWESOME FREE     to find   Gifts  tric  re  b  k you for  p;                        -Matt Dralle,    List  ========================  = Use   utilities  Day  ================================================               - MATRONICS WEB FORUMS  ==================================================



	


  [quote][b]

ChangDriver

Joined: 15 Sep 2007
Posts: 266

Posted: Thu Dec 03, 2009 7:28 pm Post subject: Re: Hobbs Meter

In my experimental plane with a radial engine, the hobbs was wired to the radio master by the prior owner with the thought that the radios are on when flying.  However, there is time the radios are on when the engine is not running (testing equipment, checking atis, etc).  



Since the tach does not track "engine time" I am in need of a good way to track something close to it (Hobbs time) so I have a reminder when to change the oil.  



My thought was the field on the alternator.  The plane has an EI Superclock that can track time from when power is applied to one lead.



Craig

ulflyer(at)verizon.net
Guest

Posted: Fri Dec 04, 2009 6:56 pm Post subject: Hobbs Meter

Hi Craig,

It's time to rally the troops.  I recalling in one of the recent 

(last couple years) aviation magazines of a vibration switch for use 

with a hobbs meter for the purpose you have addressed.  If I recall 

it was around $12-$18.  Any one recall seeing that.  The Tiny Tach is 

another alternative - you have to get the correct model depending 

upon what engine type you have (single or double high voltage pulse 

per rev.  The are dual function, Tach and engine hour meter - attach 

by wrapping a lead around the high voltage lead of one of the plugs.



If your using it for tracking hours for oil change, you should use 

the tach hours if you have a recording tach, since that reflects 

actual engine operation hours.  The hobbs were added by rental 

aircraft operators to base time for flight instruction.  Second 

function was for recording PIC time for log books.

jerb

At 11:40 AM 12/3/2009, you wrote:

 	  Quote: 	
		  

<capav8r(at)gmail.com>



I am interested in changing how the Hobbs meter in my plane is wired 

(it is currently wired to the radio master - not the best place for 

it) and don't want to install an oil pressure switch.  I know I read 

in the EAA magazine many months back of alternative ways of doing 

so, but can't find the article.



What other ways have been done?  I think the writer of the EAA 

article used the field for the alternator.



Any suggestions?



Craig





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p 76010#276010

ulflyer(at)verizon.net
Guest

Posted: Fri Dec 04, 2009 7:03 pm Post subject: Hobbs Meter

Check this link out.

http://store.wagaero.com/product_info.php?products_id=12390





At 11:40 AM 12/3/2009, you wrote:

 	  Quote: 	
		  

<capav8r(at)gmail.com>



I am interested in changing how the Hobbs meter in my plane is wired 

(it is currently wired to the radio master - not the best place for 

it) and don't want to install an oil pressure switch.  I know I read 

in the EAA magazine many months back of alternative ways of doing 

so, but can't find the article.



What other ways have been done?  I think the writer of the EAA 

article used the field for the alternator.



Any suggestions?



Craig





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p 76010#276010

nuckolls.bob(at)aeroelect
Guest

Posted: Sat Dec 05, 2009 6:24 am Post subject: Hobbs Meter

At 08:58 PM 12/4/2009, you wrote:

 	  Quote: 	
		  



Check this link out.

http://store.wagaero.com/product_info.php?products_id=12390


	


   That's pretty slick. It would be interesting to

   put it side-by-side with another meter to see

   how discriminating it is with respect to vibration

   from an engine and other potential "noises". Does

   anyone on the List have one of these installed?





        Bob . . .

lists(at)stevet.net
Guest

Posted: Sat Dec 05, 2009 6:58 am Post subject: Hobbs Meter

I was looking at the manufacturers site and notice that they offer 4 different mounting methods for this meter.  Wag Aero and Aircraft Spruce do not tell you which mounting they have offered.  See:



http://tinyurl.com/yhhxn53

Steve Thomas

________________________________________________________________________





On Dec 4, 2009, at 6:58 PM, jerb wrote:



 	  Quote: 	
		   

 

 Check this link out.

 http://store.wagaero.com/product_info.php?products_id=12390

Gilles.Thesee(at)ac-greno
Guest

Posted: Sat Dec 05, 2009 9:29 am Post subject: Hobbs Meter

Steve Thomas a écrit :

 	  Quote: 	
		   



 I was looking at the manufacturers site and notice that they offer 4 different mounting methods for this meter.  Wag Aero and Aircraft Spruce do not tell you which mounting they have offered.


	


Here's a link to the manufacturer data sheet :

http://www.enmco.com/pdf/675.PDF

Wag Aero's products seems to be the T54C1 'Rectangle Panel Mount w/ 2 

Holes'.



Most interesting. No wire, no connection, no nothing 



Best regards,

-- 

Gilles

http://contrails.free.fr

JOHN TIPTON

Joined: 17 Sep 2006
Posts: 239
Location: Torquay - England

Posted: Sat Dec 05, 2009 10:05 am Post subject: Hobbs Meter

I had a look at these items, and they all have a 8 year battery life, but

cannot be replaced - does anyone not think this could be a problem !!!



Regards: John

---

rob(at)hyperion-ef.com
Guest

Posted: Sat Dec 05, 2009 10:17 am Post subject: Hobbs Meter

To quote the data sheet: "Internal Lithium Battery 8 years plus

non-replaceable."  That makes it a bit difficult to measure total time on

the airframe, or for an average private pilot, the engine.

Best regards,



Rob Housman

Irvine, CA 

Europa XS Tri-Gear

A070

Airframe complete



--

Gilles.Thesee(at)ac-greno
Guest

Posted: Sat Dec 05, 2009 10:20 am Post subject: Hobbs Meter

JOHN TIPTON a écrit :

 	  Quote: 	
		   

 <jmtipton(at)btopenworld.com>



 I had a look at these items, and they all have a 8 year battery life, but

 cannot be replaced - does anyone not think this could be a problem !!!



You have a point here, but is replacing a 35-45 $ item every eight year 
	


or so really a problem ?

How many batteries, hoses, filters, brake pads mechanical parts will we 

have to replace before that time ?



Just thinking.

Best regards,

-- 

Gilles

http://contrails.free.fr

Gilles.Thesee(at)ac-greno
Guest

Posted: Sat Dec 05, 2009 10:29 am Post subject: Hobbs Meter

Rob Housman a écrit :

 	  Quote: 	
		   



 To quote the data sheet: "Internal Lithium Battery 8 years plus

 non-replaceable."  That makes it a bit difficult to measure total time on

 the airframe, 


	


Like with any other hourmeter, just enter the total time and date of 

replacement in the airframe or engine logbook.



Best regards,

-- 

Gilles

http://contrails.free.fr

rob(at)hyperion-ef.com
Guest

Posted: Sat Dec 05, 2009 11:46 am Post subject: Hobbs Meter

Actually I had in mind Reagan's famous "Trust but verify."

Best regards,



Rob Housman

Irvine, CA 

Europa XS Tri-Gear

A070

Airframe complete

--

mrspudandcompany(at)veriz
Guest

Posted: Sat Dec 05, 2009 11:47 am Post subject: Hobbs Meter

 	  Quote: 	
		  

 To quote the data sheet: "Internal Lithium Battery 8 years plus

 non-replaceable."  That makes it a bit difficult to measure total time on

 the airframe, 


	


Like with any other hourmeter, just enter the total time and date of 

replacement in the airframe or engine logbook.



		Sounds to me like it is more hassle than benefit.  Many

mechanics don't read all log entries for past years thus it gets forgotten.

Is there an alarm on the unit to indicate low battery, or does it just quit

and allow you to keep on flying without logging time??



		Roger

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longg(at)pjm.com
Guest

Posted: Mon Dec 07, 2009 8:22 am Post subject: Hobbs Meter

$21 at Allied. Has 8 year battery. Hard to beat.



http://www.alliedelec.com/search/productdetail.aspx?SKU 70077



--

user9253

Joined: 28 Mar 2008
Posts: 1925
Location: Riley TWP Michigan

Posted: Tue Dec 08, 2009 10:09 am Post subject: Re: Hobbs Meter

The link in the previous post did not work, but this one should:

Joe



http://www.alliedelec.com/Search/ProductDetail.aspx?SKU=207-0077&gclid=CISGmb-Lx54CFQ_xDAodcwNRrA

_________________
Joe Gores

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