On Tue, 9 Sep 2008 07:19:30 -0700 (PDT), wrote:

and at a certain RPM they go
through the range of prop pitches.

Those props have a governor that keeps the speed constant, regardless,
within limits, of load or throttle setting. More usual to go through
the range of pitches by varying the RPM with the prop governor. That's
the way everyone I ever knew did it. An airboat doesn't need a
variable pitch prop, as it doesn't climb and dive.

Casady

On Sep 9, 2:47*pm, (Richard Casady) wrote:
On Tue, 9 Sep 2008 07:19:30 -0700 (PDT), wrote:
and at a certain RPM they go
through the range of prop pitches.

Those props have a governor that keeps the speed constant, regardless,
within limits, of load or throttle setting. More usual to go through
the range of pitches by varying the RPM with the prop governor. That's
the way everyone I ever knew did it. An airboat doesn't need a
variable pitch prop, as it doesn't climb and dive.

Casady

Richard, I fully understand an airboat doesn't need a vari-pitch prop.
It would be fun to try one to see the difference in the hole shot,
though! When testing controls, it's common to set the RPM's to a
certain setting, more akin to a fast idle, and run the pitch controls
through the range. The prop governor isn't a factor at these low RPM's.

On Tue, 9 Sep 2008 12:03:57 -0700 (PDT), wrote:

On Sep 9, 2:47*pm, (Richard Casady) wrote:
On Tue, 9 Sep 2008 07:19:30 -0700 (PDT), wrote:
and at a certain RPM they go
through the range of prop pitches.

Those props have a governor that keeps the speed constant, regardless,
within limits, of load or throttle setting. More usual to go through
the range of pitches by varying the RPM with the prop governor. That's
the way everyone I ever knew did it. An airboat doesn't need a
variable pitch prop, as it doesn't climb and dive.

Casady

Richard, I fully understand an airboat doesn't need a vari-pitch prop.
It would be fun to try one to see the difference in the hole shot,
though! When testing controls, it's common to set the RPM's to a
certain setting, more akin to a fast idle, and run the pitch controls
through the range. The prop governor isn't a factor at these low RPM's.

Sure it is. The pitch control is connected to the governor, which
moves the prop blades.

Casady

On Sep 9, 5:19*pm, (Richard Casady) wrote:
On Tue, 9 Sep 2008 12:03:57 -0700 (PDT), wrote:
On Sep 9, 2:47*pm, (Richard Casady) wrote:
On Tue, 9 Sep 2008 07:19:30 -0700 (PDT), wrote:
and at a certain RPM they go
through the range of prop pitches.

Those props have a governor that keeps the speed constant, regardless,
within limits, of load or throttle setting. More usual to go through
the range of pitches by varying the RPM with the prop governor. That's
the way everyone I ever knew did it. An airboat doesn't need a
variable pitch prop, as it doesn't climb and dive.

Casady

Richard, I fully understand an airboat doesn't need a vari-pitch prop.
It would be fun to try one to see the difference in the hole shot,
though! When testing controls, it's common to set the RPM's to a
certain setting, more akin to a fast idle, and run the pitch controls
through the range. The prop governor isn't a factor at these low RPM's.

Sure it is. The pitch control is connected to the governor, which
moves the prop blades.

Casady- Hide quoted text -

- Show quoted text -

The governor only works above a certain rpm. prop pitch is changed be
a control. A lot of variable pitch prop planes don't have a governor,
and the prop pitch is adjusted with engine rpm in mind.

On Wed, 10 Sep 2008 05:19:04 -0700 (PDT), wrote:

A lot of variable pitch prop planes don't have a governor,

What do you consider " a lot "?
If such a thing even exists they are so vanishingly rare that I have
never encountered such a thing. Never heard a thing, it's absent from
the literature. If the blades move they are moved by a governor. The
governor does not vanish when it runs out of travel, it remains the
connection between the control and the prop. Props had governors as
far back as the thirties.

Casady

Richard Casady wrote:
On Wed, 10 Sep 2008 05:19:04 -0700 (PDT), wrote:

A lot of variable pitch prop planes don't have a governor,

What do you consider " a lot "?
If such a thing even exists they are so vanishingly rare that I have
never encountered such a thing. Never heard a thing, it's absent from
the literature. If the blades move they are moved by a governor. The
governor does not vanish when it runs out of travel, it remains the
connection between the control and the prop. Props had governors as
far back as the thirties.

Casady



You are engaging in a discussion with Loogy, an idiot. But you must know
that.

On Sep 10, 9:25*am, (Richard Casady)
wrote:
On Wed, 10 Sep 2008 05:19:04 -0700 (PDT), wrote:
A lot of variable pitch prop planes don't have a governor,

What do you consider " a lot "?
If such a thing even exists they are so vanishingly rare that I have
never encountered such a thing. Never heard a thing, it's absent from
the literature. If the blades move they are moved by a governor. The
governor does not vanish when it runs out of travel, it remains the
connection between the control and the prop. Props had governors as
far back as the thirties.

Casady

No, it's not. I'll scan some information direct from service manuals
of my uncles. May take a week or so, I'll get back to you.

On Sep 10, 9:25*am, (Richard Casady)
wrote:
On Wed, 10 Sep 2008 05:19:04 -0700 (PDT), wrote:
A lot of variable pitch prop planes don't have a governor,

What do you consider " a lot "?
If such a thing even exists they are so vanishingly rare that I have
never encountered such a thing. Never heard a thing, it's absent from
the literature. If the blades move they are moved by a governor. The
governor does not vanish when it runs out of travel, it remains the
connection between the control and the prop. Props had governors as
far back as the thirties.

Casady

Oh, and you are confusing a constant speed prop with a variable pitch
prop, just for the record!