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06-01-2005, 10:46 PM
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Join Date: Jun 2005
Posts: 2
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Load Factor ?
I'm new to the site, and searched for the design load factors for various Vans models to no avial. Can anyone provide this data, or a link to where it's hidden on Van's site?
Thanks in advance,
enigma
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06-02-2005, 01:36 AM
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Join Date: Jan 2005
Posts: 4,285
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RV's Load factor
You find it in Vans Construction manual.
Most models, RV-4,-6,-7,-8 are aerobatic and sized for +6G's and -3G's. Ultimate load factor is +9/-4.5, gives you a 50% margin of safety. Limit load, meaning don't exceed for aerobatic operations. Ultimate is limit with a 50% factor of safety and exceeding it could cause permanent damage or failure. Since all basic aerobatics can be done at 3-3.5 Gs this is plenty. Maneuvering speed Va, is around 135 - 142 mph. You should try to stay near or below maneuering speed. RV's can build speed fast when pointed down. So a split-S from a fast cruise speed would be bad bad bad. You would exceed Vne very easily before leveling out at the bottom.
There are limits to operate at the aerobatic load factors, a lower aerobatic gross weight (less than max gross) and restricted aft CG range. If you build a heavy RV (empty weight) you may be limited on how much fuel you can carry with two persons for aerobatics to stay within limits. Later RV's (-7/-8) have more load capacity and it is not a problem. The older designs have less allowable aerobatic gross weight. A heavy RV-4/-6 can be a solo aerobatic plane if built too heavy, at least if you want to stay within Van's aerobatic limitations.
On the RV-7/-8 the acro weight is 1600 lb, 200lbs less than max gross (1800 lb) and about 2" less aft CG range. The RV-4/-6 has a 1375 lb acro gross weight.
The RV-9 has lower limitations, Limit load factor: +4.4G to -1.76 (I think); Ultimate load factor: +6.6G/-2.64G. RV-10? Likely utility catagory same as RV-9.
Cheers George
Last edited by gmcjetpilot : 06-02-2005 at 01:39 AM.
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06-02-2005, 07:10 AM
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Join Date: Jan 2005
Posts: 335
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Load Limits
Quote:
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On the RV-7/-8 the acro weight is 1600 lb, 200lbs less than max gross (1800 lb) and about 2" less aft CG range
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George-
I think the acro limits for the -8/-7 planes is something less than 1600 lbs. unless they've changed it. I do remember it being more than the -6, but thought it was only by a few lbs. While I don't have my manual here at work, I think the acro limits are closer to the solo weights given on Van's web page, which is 1400 lbs. Someone out there got there manual handy??
Bill Waters
Added Note-
Checked my -8 manual this evenin, aerobatic weight limit is 1550#, much higher than I thought, aft CG limit is 1.5" forward of normal aft limit. My manual is about 4 years old, have these numbers been changed?
Last edited by rvpilot : 06-02-2005 at 07:25 PM.
Reason: Checked manual for numbers
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06-03-2005, 09:14 PM
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Join Date: Jun 2005
Posts: 2
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Thanks, I don't really intend to fly any intentional aerobatics. I just want to know that my bird is strong enough to handle any overexuberance.
Thanks again,
enigma
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06-04-2005, 02:46 PM
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Join Date: Feb 2005
Location: Central Alabama
Posts: 303
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Pulling "g's"
Don't forget the difference between pulling straight and rolling G's.
Pulling straight puts an even distibution of load on the wings, but if you are rolling and showing 5 G's, then the outboard wing is pulling more....a lot more.
Many F-15s and 16s have been over g'd this way.
Hwood
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09-07-2016, 09:51 PM
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Join Date: Aug 2016
Location: Sarasota, FL
Posts: 38
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Here is some information I read online about the RV10's load factor:
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RV10 Flight Load Factors:
The structure has been designed to withstand aerobatic load of 3.8 G positive and 1.9 G negative This is the maximum load the airframe structure is designed to withstand indefinitely. The calculated breaking strength is 5.7 G at which it will withstand load for 3 seconds (assuming no airframe deterioration , fatigue, material flaws or construction errors). Approaching this 5.7 G load could permanently weaken the structure even if failure does not occur.
__________________
Casey M
Sarasota, FL
EAA 180
RV-10
Starting on empennage section - August 2016
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09-07-2016, 10:04 PM
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Join Date: Jan 2005
Location: Twin Cities, MN
Posts: 1,565
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Necrothread alert!
A thread more than 11 years old rises from the dead :-)
__________________
Brad Benson, Maplewood MN.
RV-6A N164BL, Flying since Nov 2012!
If you're not making mistakes, you're probably not making anything
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