Snao G's

[Dean Pappas]

Cool! Real numbers!
Thanks Earl

Dean Pappas
Sr. Design Engineer
Kodeos Communications
111 Corporate Blvd.
South Plainfield, N.J. 07080
(908) 222-7817 phone
(908) 222-2392 fax
d.pappas at kodeos.com


-----Original Message-----
From: discussion-request at nsrca.org
[mailto:discussion-request at nsrca.org]On Behalf Of rcaerobob at cox.net
Sent: Thursday, January 27, 2005 1:57 PM
To: discussion at nsrca.org
Subject: Re: RE: Snao G's


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" <fishgod at pobox.mtaonline.net>
> Date: 2005/01/27 Thu PM 01:51:34 EST
> To: <discussion at nsrca.org>
> 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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