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  #1  
Old 03-07-2017, 10:55 AM
Ed_Wischmeyer's Avatar
Ed_Wischmeyer Ed_Wischmeyer is offline
 
Join Date: May 2005
Location: Savannah, GA
Posts: 530
Default RV-9A cg

Just put together a spreadsheet for my -9A, with the cg expressed in % MAC. I suspect I've got an error somewhere, because as long as the weights are within bounds (75 lb baggage), the spreadsheet says that I can't load the plane out of the "utility category" envelope.

Do I need to keep looking for an error in the spreadsheet, or is the cg envelope really that usable?

Ed
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  #2  
Old 03-07-2017, 11:06 AM
alpinelakespilot2000 alpinelakespilot2000 is offline
 
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Default

That sounds about right, at least for my -9. I used a 4# crush plate which allows me to carry 100# in baggage area and still be within c.g. in almost any realistic configuration, but I suspect if I would have been willing to give up that extra 25# of baggage I could have done it without the crush plate.
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  #3  
Old 03-07-2017, 01:37 PM
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bruceh bruceh is offline
 
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Default

I gave myself an extra 50 pounds of gross weight and I can't realistically get it out of balance unless the pilot weighs nothing, with minimum fuel and full baggage (100 pounds).
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  #4  
Old 03-07-2017, 01:58 PM
YellowJacket RV9 YellowJacket RV9 is offline
 
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Location: Clearwater, FL / KZPH
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Default

I can't find any realistic way to get out of CG either, as long as I am in the plane - I can take up to 100lbs baggage. I have an O-320 at metal Sensi FP prop.

Chris
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  #5  
Old 03-07-2017, 02:05 PM
krw5927 krw5927 is offline
 
Join Date: Aug 2010
Location: Wichita, KS
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Default

This is what I found as well. It's not necessarily a mistake in your numbers. For my plane, as long as there's a pilot (even a young kid) and enough gas to get off the ground, I can load out the remainder of the gross weight any way I want and not worry about CG being out of the envelope. Yours may vary of course, but what you're finding isn't uncommon.
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  #6  
Old 03-07-2017, 08:45 PM
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Ed_Wischmeyer Ed_Wischmeyer is offline
 
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Location: Savannah, GA
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Default

Thanks, all!

Ed
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RV-8 (steam gauges), RV-9A at KSAV (Savannah, GA; dual screen G3X with autopilot, GTN 650)
Previously RV-4, RV-8A, AirCam, Cessna 175
ATP CFII PhD, so I have no excuses when I screw up
2017 dues paid
Retired - "They used to pay me to be good, now I'm good for nothing."
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  #7  
Old 03-08-2017, 06:13 PM
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AF_Alan AF_Alan is offline
 
Join Date: Jul 2007
Location: Eugene, OR
Posts: 122
Default Wide range

Similar results on my 9A, FP, IO-320.

I used a spreadsheet to calculate W&B for numerous scenarios prior to DAR visit:
- Couldn't exceed aft C.G even with bingo fuel and aircraft at 1,750 gross with pilots and baggage (I placarded for 100# limit).
- Light pilot solo and low fuel would be enough to exceed forward C.G limit.
- Flown solo and full fuel needs a few pounds in baggage area to prevent exceeding the nose wheel limit.

Love my RV!
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  #8  
Old 03-09-2017, 08:12 PM
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Ed_Wischmeyer Ed_Wischmeyer is offline
 
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Location: Savannah, GA
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What's the nosewheel limit? I missed that along the way.

Thanks!

Ed
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RV-8 (steam gauges), RV-9A at KSAV (Savannah, GA; dual screen G3X with autopilot, GTN 650)
Previously RV-4, RV-8A, AirCam, Cessna 175
ATP CFII PhD, so I have no excuses when I screw up
2017 dues paid
Retired - "They used to pay me to be good, now I'm good for nothing."
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  #9  
Old 03-09-2017, 09:47 PM
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RV8JD RV8JD is offline
 
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Default Nose Wheel Weight Limits

Quote:
Originally Posted by Ed_Wischmeyer View Post
What's the nosewheel limit? I missed that along the way.

Thanks!

Ed
Check out the Nose Wheel Weight Charts in Appendix A of this SL (last page for the RV-9A):

https://www.vansaircraft.com/pdf/Nos...ice_letter.pdf

"Appendix A of this Service Letter contains charts that allow a pilot/operator to estimate the weight on the nose gear given the CG and aircraft gross weight. Operation within these limits is highly recommended and will provide a greater margin of safety should “mechanical factors and/or pilot technique” add to the normal, gravity induced load on the nose gear."
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Last edited by RV8JD : 03-09-2017 at 09:52 PM.
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  #10  
Old 03-13-2017, 06:41 AM
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Robert M Robert M is offline
 
Join Date: Feb 2006
Location: South Carolina
Posts: 635
Default re: RV-9A cg

While we are on the subject of W & B, I was curious, has anyone ever PUT 100 lbs. of weight in the back of an RV-9 or -9A?

And as always, thanks for the replies.
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