|
|
|
Wolfgang,
The harmonic damper you refer to (12 pounds, bolts to Lyc flywheel)
contains a steel ring in viscous silicone. Its purpose is to dampen
negative torque pulses and to provide for more flywheel momentum. It is
especially effective for light wooden props (rpm increase of approximately
100) but also serves it purpose with CS props even though the
result appears to be un-measurable. Review the torsional
effects of a 4 cylinder engine here:
It contributes nothing to dynamic prop balance :-(
Grayhawk
In a message dated 8/12/2010 3:45:09 P.M. Central Daylight Time,
Wolfgang@MiCom.net writes:
Or put a silicon filled balance ring at the prop
hub :-)
Wolfgang
|
|
Vibration sensor is placed on engine to measure
how engine is moving in space.
Prop imbalance will make engine move
in bigger circle.
So mayny Millivolts are genrated per vibration
severity.
Relative location of heavy spot is signaled by
photo cell, or strobe light flash as heavy spot passes and polarity
changes. Up-down = plus-minus.
The prop's static weigh
slugs can be adjusted or large area washers can be bolted to spinner
bulkhead to counterbalance the heavy spot.
How much depends weigh
depends on how much imbalance there was to begin with.
Common to
have 10-30 grams of weight for a momento of 100-200 inch
pounds.
Kent Felkins
Tulsa Oklahoma
----- Original
Message ----- From: "Greenbacks, UnLtd." <N4ZQ@comcast.net>
To:
<lml@lancaironline.net>
Sent: Thursday, August 12, 2010 7:20
AM
Subject: [LML] Re: Prop Balance
Could one of you describe the process of dynamically
balancing a
typical prop?
My old brain cannot visualize how
weights are attached.
Angier Ames
N4ZQ
--
For
archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html
|
|
|