In article .com,
"Robert M. Gary" wrote:

On Oct 24, 7:31 am, " wrote:
On Oct 23, 6:27 pm, wrote:





: Congrats to Hartzell and Kevin for stepping up to the plane and
: accepting some responsibility for a marginal design of the hub. A
: very nobel act in this day and age..

: A "marginal design" that has worked without problems since the 70's.
: Certainly much more reliable than anything Lycoming, Cont., Cessna,
: King, etc have ever made.

: -Robert

Engineering (*especially in aviation*) is about making something
as strong as necessary, but no stronger.

-Cory

--

************************************************** ***********************
* Cory Papenfuss, Ph.D., PPSEL-IA *
* Electrical Engineering *
* Virginia Polytechnic Institute and State University *
************************************************** ***********************

If there has not been "any problems" with it why is there a repetitive
eddy current inspection on Hartzell prop hubs. ????

Because companies who have reliable products don't sell enough
products. Toss in the fact that the FAA will issue an AD almost
anytime a company asks for it you have your answer.

-Robert

That is especially true of Hartzell. One of their propellers requires an
"optical conformity check" to assure that the blases conform to Hartzell
specs. Only problem is that some owners submitted zero-time blades,
which failed the test!

The word is, "never ship your prop to Hartzell -- they will junk it and
sell you a new one."