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Bill I just looked this up in Martini Hollman's
book 'Modern Aircraft Design Vol.-1' here's a direct quote from Pg
78.
"During a normal landing touch down is on the two
main wheels and a limit landing load factor for these wheels should be greater
than 2.67 per 14CFR, Part 23. From my experiance, both shock and rigid mounted
landing gears can be designed to a limit landing load factor of 3 to 5.5
depending on the size, shock system and landing speed of the a/c. We are allowed
to subtract out a lift factor of 0.667."
Also you had asked if I'd done any checking on the
motor mount depicted in some of my pictures. I did a quick and dirty check to
see what happens w/ the basic load and wasn't quite satisfied so I upped some of
the mat'l thicknesses and am re-running it as I write this. If you
want, I'd be glad to pass on what info I have to you. { off list }
I haven't found any info on motor mount loads as of
yet but will pass them on if I come across them. I just used 9g+ and 4.5- for
mine w/ a small side load [ the first check] the second one is a bit more in
depth w/ a torque load also.
Jarrett Johnson
----- Original Message -----
Sent: Monday, April 18, 2005 9:18
AM
Subject: [FlyRotary] Motor Mount
Loads??
When designing an engine mount, what loads should
you design to?
Of course, the mount must withstand the ultimate loads
of +9 g and -4.5 g, but what about gyroscopic loads imposed by the spinning
engine and prop during abrupt maneuvers?
What landing gear loads would
be prudent?
Thanks in advance,
Bill Dube'
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