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  #1  
Old 01-08-2016, 02:23 PM
rvbuilder2002's Avatar
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,598
Default RV-14 C.G. / weight & balance sample

A (sample) document containing W & B data for the RV-14 and RV-14A prototypes can be found HERE

RV-14 C.G. quick reference chart HERE
And RV-14A C.G. quick reference chart HERE

(It would be great if a mod. would sticky this thread.....)
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Scott McDaniels
Hubbard, Oregon
Van's Aircraft Engineering Prototype Shop Manager
FAA/DAR
RV-6A (aka "Junkyard Special ")

Last edited by rvbuilder2002 : 10-08-2019 at 10:43 AM.
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  #2  
Old 01-08-2016, 03:32 PM
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Mike S Mike S is offline
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Location: Dayton Airpark, NV A34
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Quote:
Originally Posted by rvbuilder2002 View Post
(It would be great if a mod. would sticky this thread.....)
You got it
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Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

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  #3  
Old 01-09-2016, 03:40 AM
MLock MLock is offline
 
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Just weighed N914VA the other day. 1246 lbs. empty, w/o paint. Empty C.G came out at 81.38".

Will reweigh after paint next month.
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Last edited by MLock : 01-09-2016 at 03:49 AM.
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  #4  
Old 01-09-2016, 04:52 AM
Ron B. Ron B. is offline
 
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Thanks Mitch
Any idea what was added for the extra weight from Van's #?
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  #5  
Old 01-09-2016, 12:12 PM
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I don't know if it would account for all of the difference, but Garmin G3X components are a bit heavier than Skyview.
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Scott McDaniels
Hubbard, Oregon
Van's Aircraft Engineering Prototype Shop Manager
FAA/DAR
RV-6A (aka "Junkyard Special ")
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  #6  
Old 01-09-2016, 05:49 PM
MLock MLock is offline
 
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It's most probably the Garmin panel. It's pretty complete with dual G3X's, GTN750, GMA 240 audio panel, GMC 307 AP controller, a GTR200R comm, GDL 39, remote GTX 330 xpndr, and all the attendant modules that go with supporting these devices. And there are a bunch of them.

Plus I have good solid carpet in the front an rear from Flightline Interiors along with leather seats and armrests.

It all adds up. I will reweigh it after paint and see where we are then.
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  #7  
Old 01-10-2016, 10:56 AM
SabreFlyr SabreFlyr is offline
 
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Quote:
Originally Posted by Ron B. View Post
Any idea what was added for the extra weight from Van's #?
What did Van's -14 end up weighing empty. They don't have an empty weight on the spec page yet.
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RV-14 #140212
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  #8  
Old 01-10-2016, 12:24 PM
MLock MLock is offline
 
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I believe it was 1,232 lbs.
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  #9  
Old 01-10-2016, 01:57 PM
Ron B. Ron B. is offline
 
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Quote:
Originally Posted by SabreFlyr View Post
What did Van's -14 end up weighing empty. They don't have an empty weight on the spec page yet.
Yes they do , first link on the opening post.
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  #10  
Old 01-11-2016, 08:33 PM
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czechsix czechsix is offline
 
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Default Interesting...

Quote:
Originally Posted by MLock View Post
Just weighed N914VA the other day. 1246 lbs. empty, w/o paint. Empty C.G came out at 81.38".

Will reweigh after paint next month.
Scott & Mitch, thanks for posting this info. A few comments/questions:

It's interesting that Mitch's -14A has a CG that is further aft (81.38) compared to the original prototype RV-14A (which came out at 80.61). I would have expected the opposite. Most significantly, Mitch's plane is unpainted...paint moves the CG aft, so an unpainted airplane should have a further forward CG. If the avionics in the panel area are heavier in Mitch's plane, that would move the CG slightly further forward. The G3X pitch servo is lighter than Dynon's, which would again move the CG forward. Something doesn't add up, unless the leather seats & bag compt upholstery weighs an extra 50 lbs or so. Is there anything else mounted in the aft fuselage on Mitch's plane (transponder, magnetometer, yaw damper servo)?

As a side note, the empty weight of the proto -14A on the https://www.vansaircraft.com/pdf/RV-..._SampleW&B.pdf worksheet doesn't equal the sum of the three wheel weights. 436 + 364 + 435 = 1235 lb (not 1239 as shown). I'm not trying to nitpick, just wondering if the discrepancy indicates any errors in the original data (which might explain the CG differences as well?).

The reason it matters is because if I use the data from the original -14A, I can put a Whirlwind prop on it and stay within aft CG with two average adults, full baggage, and minimum fuel. Using Mitch's numbers, I'll have to stick with the Hartzell otherwise I run out of aft CG unless I limit myself to less baggage or lighter than average pilot/passenger. And it'll only get worse after painting.

Thanks,
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RV-8A N2D #80583 - built/flew/sold
RV-14A #140017 - wings complete, empacone in progress...
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