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  #11  
Old 02-23-2016, 07:15 AM
Canadian_JOY Canadian_JOY is offline
 
Join Date: Aug 2007
Location: Ontario, Canada
Posts: 2,291
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Quote:
Originally Posted by PilotBrent View Post
Weight and balance. Did the W&B more of interest to me as I had the fuel tank drained. See your point that several of the optional cabin items can move around affecting the CG. Sill have the scales so probably should redo with everything optional removed and then add that to the logbook.
What you've established in this exercise is a very important number - Basic Operating Weight, or BOW. This is the handiest number that we, as pilots, can have available to us.

A true Empty Weight, as defined by the FAA, is not particularly useful to us when we're standing on the ramp on a hot day, trying to figure out how much fuel we can add to the tank to stay within gross weight and CofG limits.

By contrast, the BOW takes away all the math associated with adding engine oil etc etc. The BOW is the "flying weight" of the airplane - add to it your pilot and passenger weight, fuel and cargo, and you've quickly and easily arrived at your current aircraft weight.

When I calculate BOW I also add my own weight (+10lbs for winter ops) so the only variables are passenger, fuel and cargo. Knowing your BOW means you'll have fewer opportunities to make errors when calculating current aircraft loaded weight and CofG.
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  #12  
Old 02-23-2016, 10:54 AM
cactusman cactusman is offline
 
Join Date: Oct 2012
Posts: 421
Default Rotax 912 Spark Plug Condition

I'm going to hijack this thread, and add my spark plug pics and ask the experts who have done more work on replacing and examining 912 plugs to weigh in and see if I have any problems here:









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  #13  
Old 02-23-2016, 06:56 PM
BigJohn BigJohn is offline
 
Join Date: Nov 2008
Location: Gloversville, NY
Posts: 1,587
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They look normal IMHO.
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John Peck, CFII, A&P, EAA Tech Counselor, Flight Advisor.
?Master Pilot? Award, UFO Member.
RV-12 N37JP 120176 Flying since 2012.
One Week Wonder Build Team, OSH 2018.
VAF paid through 10/2019.
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  #14  
Old 02-23-2016, 07:28 PM
BobTurner BobTurner is offline
 
Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,797
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Quote:
Originally Posted by Canadian_JOY View Post
What you've established in this exercise is a very important number - Basic Operating Weight, or BOW. This is the handiest number that we, as pilots, can have available to us.

A true Empty Weight, as defined by the FAA, is not particularly useful to us when we're standing on the ramp on a hot day, trying to figure out how much fuel we can add to the tank to stay within gross weight and CofG limits.

By contrast, the BOW takes away all the math associated with adding engine oil etc etc. The BOW is the "flying weight" of the airplane - add to it your pilot and passenger weight, fuel and cargo, and you've quickly and easily arrived at your current aircraft weight.

When I calculate BOW I also add my own weight (+10lbs for winter ops) so the only variables are passenger, fuel and cargo. Knowing your BOW means you'll have fewer opportunities to make errors when calculating current aircraft loaded weight and CofG.
Here in the US "basic empty weight" includes engine oil, unuseable fuel.
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  #15  
Old 02-23-2016, 11:50 PM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,820
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John,

Some of mine are tan, and some are a darker brown. I toss them every year and go with new plugs. At the going rate it seems like a cheap way to go. I didn't see anything on your pics that is different from what I have seen in 3 annuals.

Rich
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  #16  
Old 02-24-2016, 06:51 AM
Canadian_JOY Canadian_JOY is offline
 
Join Date: Aug 2007
Location: Ontario, Canada
Posts: 2,291
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Quote:
Originally Posted by BobTurner View Post
Here in the US "basic empty weight" includes engine oil, unuseable fuel.
The true power of the "Basic Operating Weight" is that it includes all the "stuff" you normally haul along with you. I don't fly without my flight bag, so that is included in the BOW for my airplane. Same for headsets, tiedown equipment and basic survival equipment. Having all these weights rolled up into one handy number makes calculations on the ramp so much easier.
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