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Long EZ strength

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fulcona

Active Member
Joined
Dec 20, 2004
Messages
29
Anyone know what the wing loading is on a Long EZE canard... and how many G’s it’s good for.
 

Marc Zeitlin

Exalted Grand Poobah
Joined
Dec 11, 2015
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698
Location
Tehachapi, CA
Anyone know what the wing loading is on a Long EZE canard... and how many G’s it’s good for.
A Long-EZ (spell it correctly) has 94 ft^2 total wing area (main wing and canard) and has a POH MGW of 1325 lb. for a total of 14 lb/ft^2 average. The canard, which is ~13 ft^2, can carry between 20 - 35% of the aircraft's weight depending upon IAS and CG. At the 35% level, that's about 35 lb/ft^2.

The POH V/N diagram lists the Long-EZ as a 5G max. aircraft at 1325 lb. Doesn't matter which airfoil - both are capable of 5G's.

Long-EZ canards have been tested and failed anywhere between 7G and 14G, so obviously very dependent upon builder quality. 7G is well below the usual safety factor of 2X for composite structures (meaning that the canard should have failed at 10G), and 14G is well above that.
 

Victor Bravo

Well-Known Member
Joined
Jul 30, 2014
Messages
7,774
Location
KWHP, Los Angeles CA, USA
I also had understood he designed the structure with enough margin to overcome almost every possible failure of builder QC and fabrication skill that he could think of.
 
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