Snao G's

[Earl Haury]

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
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