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  #21  
Old 05-14-2015, 08:46 PM
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tomkk tomkk is offline
 
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Location: Port Orange, Fl
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Must have something to do with how it gets entered into FF. My interpolations were not exactly what yours are but only very slightly different - not enough to make a difference. You did two more points than I did - I only had one point each at 1260 and 975 but I don't see that making a difference since the additional two points are just at some midpoint of a straight line.

Beats me ...
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Port Orange, Fl
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RV-12 N121TK ELSA #120845; first flight 06/10/2015; 700 hrs as of 02/2020
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  #22  
Old 05-14-2015, 09:16 PM
ChuckC ChuckC is offline
 
Join Date: Apr 2011
Location: Meridian, ID
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Small changes in the interpolation of the Flight Envelope do make a difference. Here are changes - shown in parenthesis - I made to the Flight Envelope interpolation:



And, after entering the revised data in ForeFlight Weight & Balance Setup, here is the new envelope:



Now, the ForeFlight Flight Envelope looks like a fat POH Flight Envelope.

It would be nice if we had some Flight Envelope data points from Van's; yet, I think, this is pretty close.
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  #23  
Old 05-14-2015, 10:47 PM
Rik Rik is offline
 
Join Date: May 2015
Location: San Rafael
Posts: 32
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With help from Joe I got closer...

I just added the following data:

Forward:
67" - 840 lbs
100.5" - 1260 lbs
108" - 1320 lbs

Aft:
67.5" - 840 lbs
83" - 974 lbs
107.5" - 1275 lbs
111" - 1320 lbs

The graph looks about 98% the same... The CG of course will not work as I get "Caution: If you burn more fuel than planned, your CG may become to far aft"

Load is set with single person (180 lbs) and 15 gal of gas...
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  #24  
Old 05-14-2015, 10:49 PM
Rik Rik is offline
 
Join Date: May 2015
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Chuck, does it matter than I input the data from light to heavy vs. your heavy to light?
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  #25  
Old 05-15-2015, 07:36 PM
ChuckC ChuckC is offline
 
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Location: Meridian, ID
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No, it does not matter what order you list the forward or aft CG limits/weights in ForeFlight. When you are in Setup, press Edit. Three grey bars will appear to the right of each CG Limit - you can press on the three bars and move the line to any position you want. I mixed up all the different limits, and, it did not have an affect on the Flight Envelope (Graph).

Interpolating the POH Figure 6-2 Flight Envelope may give us each slightly different numbers; but, they should be fairly close. I agree with others that the CGs should be somewhere between 79 and 86 inches.
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  #26  
Old 06-26-2015, 10:02 PM
TLYNCH TLYNCH is offline
 
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Location: Mequon, WI
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I looked at 6-8 but still don't know the forward and aft unique weight. How did you get that?
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  #27  
Old 09-06-2019, 07:03 PM
tbag tbag is offline
 
Join Date: Sep 2019
Location: Scappoose
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Default Did anyone every figure out how to get this to work properly?

If so can you share all the info you put into Foreflight. New RV12 owner would like to just plug it in if you guys got it to work.

Thanks!
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  #28  
Old 09-14-2019, 03:19 PM
lon@carolon.net lon@carolon.net is offline
 
Join Date: Aug 2015
Location: Santa Monica, California
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Quote:
Originally Posted by tbag View Post
If so can you share all the info you put into Foreflight. New RV12 owner would like to just plug it in if you guys got it to work.
Thanks!
From one new RV12 owner to another:

I'm not able to post attachments, but if you'll send me an email, I'll return screen shots of my Foreflight Weight & Balance pages so you'll be able to see what worked for me.

Lon
lon@carolon.net
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