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11-30-2008, 09:42 AM
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Join Date: Mar 2005
Posts: 7
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Weight vs G limits
For my RV-6 the aerobatic weight is 1,375 lbs. I have calculated the equivalent G limit at other weights as follows and would like to know if my reasoning is correct.
Weight G's "G Weight"
1,375 6.0 8,250
1,450 5.7 8,250
1,500 5.5 8,250
1,550 5.3 8,250
1,600 5.2 8,250
My conclusion is that I can pull 5 G's at my max weight of 1,600 lbs and still be within the design specs.
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11-30-2008, 09:46 AM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,762
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Yes
Your reasoning is correct. But I personally wouldn't push it to the limits. I stay within "utility category" limits (4.4Gs) at gross weight.
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
Last edited by Mel : 12-01-2008 at 03:27 PM.
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11-30-2008, 11:01 AM
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Join Date: Feb 2005
Location: Huskerland, USA
Posts: 5,862
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Welcome to VAF
Is it safe to assume the "weak points" in high "G's" are the spars & engine mounts? Where are the failure / damage points at?
Just curious.
__________________
RV-7 : In the hangar
RV-10 : In the hangar
RV-12 : Built and sold
RV-44 : 4 place helicopter on order. 
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11-30-2008, 12:28 PM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,762
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Quote:
Originally Posted by Geico266
Welcome to VAF
Is it safe to assume the "weak points" in high "G's" are the spars & engine mounts? Where are the failure / damage points at?
Just curious.
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Only the designer, and sometimes the test pilot know for sure!
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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11-30-2008, 01:28 PM
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Join Date: Jan 2005
Location: SoCal
Posts: 2,061
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The Van's -8 demonstrator got overstressed and snapped the wing around midspan. Remember though that our wings are of stressed-skin design, so I'm not sure that you can really say that the spar is the weakness.
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Steve Zicree
Fullerton, Ca. w/beautiful 2.5 year old son
RV-4 99% built  and sold 
Rag and tube project well under way
paid =VAF= dues through June 2013
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11-30-2008, 07:30 PM
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VAF Moderator / Line Boy
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Join Date: Jan 2005
Location: Dayton, NV
Posts: 12,247
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Just remember that gross weight is not based solely on structural loading, and the CG envelope is not always a straight set of datum limits - the forward and aft points can change with Gross weight such that as you get heavier, the envelope gets smaller.
Paul
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Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
http://Ironflight.com
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11-30-2008, 09:45 PM
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Join Date: Mar 2007
Location: Auckland, NZ
Posts: 147
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Given these are design/structural limitations, I assume they're not determined by our flight testing and so must be published somewhere. Can anyone point me to them as I'd like to put them in my PoH.
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Cheers
Steve
Auckland, New Zealand
Flying RV-7QB/ZK-NVS/Aerosport 0320/Dual AF3500s/PMA8000B/GNS430W/SL30/GTX327/TT ADIP II
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12-01-2008, 05:44 AM
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Join Date: Sep 2006
Location: Defiance, MO
Posts: 1,666
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Loading Conditions
One other thing to keep in mind is that the aerobatic catagory and the utility catagory use different loadings to determine strength margins. In the utility catagory no analysis may be done for a unsymetric max g pull as that is not a manuver used by a utility category aircraft.
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Philip
RV-6A - 14+ years, 900+ hours
Based at 1H0 (Creve Coeur)
Paid dues yearly since 2007
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12-01-2008, 06:42 AM
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Join Date: Dec 2007
Location: Flagstaff, AZ
Posts: 2,647
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Quote:
Originally Posted by sjjonesnz
Given these are design/structural limitations, I assume they're not determined by our flight testing and so must be published somewhere. Can anyone point me to them as I'd like to put them in my PoH.
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Page 15-21 in my RV-7 manual (old preview plans). Section 15 is Final Inspection and Flight Test. The relevant heading is G-Load Testing.
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Patrick Kelley - Flagstaff, AZ
RV-6A N156PK - Flying too much to paint
RV-10 14MX(reserved) - Fuselage on gear
http://www.mykitlog.com/flion/
EAA Technical Counselor #5357
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12-01-2008, 01:28 PM
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Join Date: Mar 2007
Location: Auckland, NZ
Posts: 147
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Thanks for that, but unless I'm missing something I can't see what the max. G-limit is at MAUW (1800lbs) and at weights between that and max aerobatic weight (1600lbs).
Knowing those limits I'll know how much fun I can safely have with my 220+lb friends
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Cheers
Steve
Auckland, New Zealand
Flying RV-7QB/ZK-NVS/Aerosport 0320/Dual AF3500s/PMA8000B/GNS430W/SL30/GTX327/TT ADIP II
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