Dynamic prop balance

With a four-banger, the pistons tend to stop halfway along the bores. That
would put
the front throw either up or down. That would mean that the prop stops in
the
vertical position when it's indexed this way. Correct?

It's actually about 45 degrees from vertical. A whole tie down row
happened to fill up with Skyhawks the other day. While walking to my plane,
I noticed that all the props were at the same angle. It looked like someone
had gone out and arranged them. Rather a pretty picture actually.

--
Roger Long

"Roger Long" om writes:

While walking to my plane,
I noticed that all the props were at the same angle. It looked like someone
had gone out and arranged them.

This *is* done sometimes, isn't it? It's something I've suspected but never
investigated.

The reason I suspect it is that I think that I've noticed my props having
been turned after an FBO has moved it. I assumed that they want the props
near horizontal for towing. That would be especially true for a single
(tractor) engine plane.

--kyler

In article ,
Kyler Laird wrote:

"Roger Long" om writes:

While walking to my plane,
I noticed that all the props were at the same angle. It looked like someone
had gone out and arranged them.

This *is* done sometimes, isn't it? It's something I've suspected but never
investigated.

The reason I suspect it is that I think that I've noticed my props having
been turned after an FBO has moved it. I assumed that they want the props
near horizontal for towing. That would be especially true for a single
(tractor) engine plane.

--kyler

Many line service departments have a trick of turning the props vertical
(or horizontal, take your pick) after they fuel the plane. It makes it
easy to look down a line of tied-down planes and see if any need to get
topped off. This works well in a situation where there are standing
orders to refuel automatically, which would often be the case at a
flight school or club.

No these were all planes by different owners and we have a self service fuel
station.

--
Roger Long

"Kyler Laird" wrote in message
...
"Roger Long" om writes:

While walking to my plane,
I noticed that all the props were at the same angle. It looked like
someone
had gone out and arranged them.

This *is* done sometimes, isn't it? It's something I've suspected but
never
investigated.

The reason I suspect it is that I think that I've noticed my props having
been turned after an FBO has moved it. I assumed that they want the props
near horizontal for towing. That would be especially true for a single
(tractor) engine plane.

--kyler

Roger Long wrote:

With a four-banger, the pistons tend to stop halfway along the bores. That
would put
the front throw either up or down. That would mean that the prop stops in
the
vertical position when it's indexed this way. Correct?

It's actually about 45 degrees from vertical.

That indicates that the prop was indexed to allow hand-propping, not indexed for the
least vibration.

George Patterson
If you don't tell lies, you never have to remember what you said.

On Wed, 05 May 2004 14:19:08 GMT, "G.R. Patterson III"
wrote:

snip

That indicates that the prop was indexed to allow hand-propping, not indexed for the
least vibration.

sig snip

On Wed, 05 May 2004 02:30:47 GMT, "G.R. Patterson III"
wrote:

With a four-banger, the pistons tend to stop halfway along the bores. That would put
the front throw either up or down. That would mean that the prop stops in the
vertical position when it's indexed this way. Correct?

Unsure. Honestly have never really thought about it from this
perspective.

As you posted above, I seem to remember when indexed according to "the
book", the descending blade would typically stop approximately 45
degrees from the "top" (vertical)..

It would seem reasonable to me that this would be one bolt hole away
(in the direction of rotation) from being aligned with the #1 throw.

I'm sorry I cannot be more specific, it's been several years since I
left GA. If you don't "use it", you eventually start to "lose it", I
guess.

TC