Sorry Peter,I mis-spoke. Thought you were talking about something
else but then read the prior posts and realized my FU.

Jim P.
--- In Q-LIST@yahoogroups.com, "Jim Patillo"
<logistics_engineering@m...> wrote:

Peter,

I have a Dynamic Prop Balancer which actually makes it fairly easy
to balance the whole assembly in one step. The FAA calls for a
balance if over 2.0 IPS (I think) for certified airplanes? Mine is
balanced to .05 IPS with a near 0 phase angle. It makes the engine
pretty smooth.

The additional problem however, comes from the harmonics of the
airframe as it cuts through the air. You can get a good ground
balance and still have vibration at certain RPM's in the air. You
just have to play with the dynamic balance to compensate.


It would be so nice to be able to balance the whole thing in the

air

at a particular cruise speed.

Regards,

Jim


--- In Q-LIST@yahoogroups.com, "Peter Harris" <peterjfharris@b...>
wrote:

I think balance is a big factor but not so easy to balance the

cone.

Peter
----- Original Message -----
From: Jim Patillo
To: Q-LIST@yahoogroups.com
Sent: Friday, January 13, 2006 3:31 AM
Subject: [Q-LIST] Re: aluminum spinner - ACS SN-4?


Sam,

FYI, I've been using an aluminum spinner, aluminum backing

plate

and

aluminum front bulkhead (wrapped with small diameter black

rubber fuel

hose)for 700+ hours now and have never had a problem. The

front

bulkhead/rubber hose to spinner is a fairly snug push on fit.

Regards,

Jim P.

P.S. I've now converted the outer bushings on my ailerons and

elevators

from steel on steel bushings(factory)to Rulon on steel. It

completely

eliminated the up/down slop found on most all Q's. The

controls

are

extremely smooth. I will keep everyone informed as I complete

a

1 yr.

test period.


-- In Q-LIST@yahoogroups.com, shoskins@m... wrote:
>
> Apparently the plate/tubing combination was not rock solid

and

some

movement
> occurred. This movement flexes the back plate and develops

cracks.

The cracks
> appear as very thin black lines on the backplate, often

around

the

> circumference of the crankshaft flange.
> Sam
>
>
>
>
>
>
>






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