I'm awfully glad to hear that, Paul {:>).  Seriously, I know the

plan has

been to thoroughly wring it out on the test stand much harder

than

what I

would (intentionally) expose it to on the aircraft and I have

full

confidence that if it passes the test stand, the flight test

will be

anticlimactic.  However,  from my perspective I can think of  a

few

priority

requirements before flying with the LAEV  Most are obvious, but

some

of you

may think of  other pertinent factors that need attention.

    1.  The blades stay attached to the hub {:>) and maintain

their

structural integrity (Example:  no sign of undue stress or wear

at

the hub

attachment point, no cracks in composite near hub, etc)

    2.  The blades have a minimum and maximum pitch mechanical

stop

such

that the electrical control can not force them past that point.

Minimum

point should ensure sufficient thrust for continued safe flight)

(can't

recall if the hub design has such, Butch)

    3.  A failure mode analysis of what happens if an internal

component

fails.  For example is there any failure mode whereby the two

blades

would

not be in pitch synchronization/alignment?  If the screw drive

fails, does

the blade pitch lock at that setting?

    4.  It would be nice if while on the test stand, with the

engine

running

that the ignition/fuel to one rotor be shut off, so that only

one

rotor if

providing power.  The engine really vibrates in that mode and

could

provide

unusual stresses to the prop and hub.  Not that I expect

anything to

happen,

but would be nice to confirm that.

    Any suggestions as to what gyration parameters the prop/hub

should be

subjected to while on the test stand?

Any other suggestions would be welcomed

Ed Anderson

Number 4. is a good idea. I'll see if I can arrange that Ed.

I'll let Butch handle the other numbers.

Paul Lamar

Joseph Berki wrote:

What about the stress on the blades while loading and  unloading as

they

pass through the wing root area for pusher applications?  How does

this

affect the rest of the system?
Joe Berki
Limo EZ
pusher--

Good point Joe and we won't be able to test that on the dyno.
I suggest a parachute :)

Paul Lamar

Paul,
I seem to remember that you planned to have a way of tilting and
gyrating the entire motor mount/engine/prop assy while running it full
tilt? Is this so? Most engine/prop/redrives are tested professionally
that way to check the forces.
[Marc Wiese]

Yes we are but it does not simulate what happens when a blade passes through a wing
wake.

Paul Lamar
 
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