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  #81  
Old 03-17-2017, 08:25 PM
Vac Vac is offline
 
Join Date: Jul 2009
Location: Niceville, Florida
Posts: 298
Default Weight and Balance Briefing Version 1.1

Minor correction to the weight and balance briefing on the "flying heavy" slide at the end of the briefing. Removed confusing bullet regarding density altitude effects.

Updated version available for download in pdf format here: https://drive.google.com/file/d/0B8E...ew?usp=sharing

Please drop a line or email if you'd like a .pptx (PowerPoint) version of the file.

Fly Safe,

Vac
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Mike Vaccaro
RV-4 2112
Niceville, Florida
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  #82  
Old 03-20-2017, 09:39 AM
Vac Vac is offline
 
Join Date: Jul 2009
Location: Niceville, Florida
Posts: 298
Default Weight and Balance Version 1.2

Hi Folks!

I've gotten some good feedback over the past week, and have made another revision to the weight and balance briefing. In this version, I added a slide explaining zero fuel weight because in some cases, it's possible to load some RV's so that the CG will remain neutral or shift forward slightly during flight. I added another slide using an RV-8 example with a light weight pilot and forward baggage only to illustrate the concept.

I also added a bullet to the compartment weight slide highlighting the need to understand the different baggage configuration for a particular aircraft.

A PDF version can be downloaded here: https://drive.google.com/file/d/0B8E...ew?usp=sharing

If you'd like a Powerpoint version, just drop a line.

21 March Edit: Added slide numbers and revised bullet on slide Number 9 regarding baggage limits, which vary depending on RV-type.

Version 1.3 in PDF format can be downloaded here: https://drive.google.com/file/d/0B8E...ew?usp=sharing

Fly safe,

Vac
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Mike Vaccaro
RV-4 2112
Niceville, Florida

Last edited by Vac : 03-22-2017 at 05:20 AM. Reason: Added Revision 1.3 to this post
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  #83  
Old 06-25-2017, 02:26 PM
Vac Vac is offline
 
Join Date: Jul 2009
Location: Niceville, Florida
Posts: 298
Default Update to Weight and Balance Briefing

Version 1.4 is available via this link: https://drive.google.com/file/d/0B8E...ew?usp=sharing

This version has a couple of slides added based on other forum discussion regarding deviating from designer recommended weight and balance limits.

Fly safe,

Vac
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Mike Vaccaro
RV-4 2112
Niceville, Florida
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  #84  
Old 06-27-2017, 09:42 AM
sblack sblack is offline
 
Join Date: Dec 2009
Location: Montreal
Posts: 1,121
Default

There is an error in the slide shown on the home page. Static margin is the distance (in % MAC) between the CG and the neutral point, not the weight (CG) and the "lift". The lift vector is typically somewhere between 20 and 30% (it moves with AOA), but the neutral point is usually 50-60%MAC, depending on the horizontal tail size and moment arm. A rule of thumb is that you want at least 15% static margin for good handling.

Stability has nothing to do with whether the tail is lifting up or down. You can have a stable airplane in either case, or an unstable one. The direction of the tail lift is important for trim, but not stability. The change in tail lift with AOA is very important for stability, but not the absolute lift at a specific flight condition. Stability and trim are 2 things that are often jumbled up - there are a lot of misconceptions out there about these concepts. The airport coffee shop aces frequently mangle these, along with the legacy of poor old Bernoulli. I always liken it to kids learning about sex in the school yard. The information is readily available but accuracy is not guaranteed.
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Scott Black
RV 4, with an engine...and other stuff
VAF dues 2016

Last edited by sblack : 06-27-2017 at 02:03 PM.
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  #85  
Old 06-27-2017, 11:28 PM
Vac Vac is offline
 
Join Date: Jul 2009
Location: Niceville, Florida
Posts: 298
Default

Hi Scott,

Thanks for taking time to post--I enjoyed the metaphor...

You are correct. The drawings used in the graphic are taken from an RVator article. Introduction of the words "static margin" is mine, since my background is fighters and I tend to think in those terms, so I'm responsible for conflating terminology that has resulted in less than precise discription. I don't believe any Van's publications utilize the phrase. If you'd like to help me re-work the graphics and any associated portions of any of the briefings or the transition training manual, drop me an email at vacf15 at yahoo dot com, as I'd be greatful for the help editing! My objective is to produce free, high-quality training resources for the community, and collaboration is one of the keys to making that happen.

Regards,

Vac
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Mike Vaccaro
RV-4 2112
Niceville, Florida

Last edited by Vac : 06-27-2017 at 11:58 PM.
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