Snao G's

[brianyemail-nsrca at yahoo.com]

For the tube itself that load can be approximated by setting your tube between two chairs resting your hands in the middle and raising yourself off the floor, for me thats a 180lb load. 
 
I guess you could do the same test with your plane....... 

rcaerobob at cox.net wrote:
Yeaop. That works out to about 147 lba (assuming a 10.5lb plane) distributed on that 7/8" dia wing tube, with complete concentration of the G's likely at the fuse/wing root intersection, with some load distribution laterally, but I'd bet not much.

How many of us ever "test" our wing sockets to 150 lbs!!!!
> 
> From: "Michael Laggis" 
> Date: 2005/01/27 Thu PM 01:51:34 EST
> To: 
> Subject: RE: Snao G's
> 
> Very interesting.
> 
> Michael Laggis
> 
> _____ 
> 
> From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org] On
> Behalf Of Earl Haury
> Sent: Thursday, January 27, 2005 9:40 AM
> To: Discussion List, NSRCA
> Subject: Snao G's
> 
> 
> FWIW, I took a quick look at some snap G's yesterday. Equipment was a Quique
> YAK (140 size) fitted with an Eagle Tree Systems datalogger with G sensor. I
> only gathered data from one flight - so take that into consideration.
> 
> Flat and level pos snaps @ (nominally) 100mph = 13G, dropping the speed to
> 70mph = 7G. (A normal pull to vertical @ 100mph = 7G.)
> 
> An Avalanche with a neg snap at the top measured -5G @ 50mph.
> 
> A Rev Avalanche with a pos snap at the bottom measured 13G @ 95mph. (Masters
> maneuver - intentionally flown fast.)
> 
> An Avalanche from the top (push - F05) with a neg snap and a half at the
> bottom measured -14G @ 90mph. 
> 
> (I normally measure around 5G on upline and downline snaps with my Partner.)
> 
> All snaps were executed with rapid / high degree elevator lead and %
> reduction of elevator during rotation.
> 
> I may look at this further as the mood strikes. As expected, controlling
> speed into snaps is easier on your airplane. None of the observed loads (in
> my opinion) should damage a well constructed aerobatic model (wouldn't want
> to ride in it though).
> 
> Earl
> 
> 

Bob Pastorello, El Reno, OK, USA
rcaerobob at cox.net
www.rcaerobats.net

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