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erichweaver(at)cox.net
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 Posted: Mon Apr 03, 2006 3:48 pm Post subject: prop governor control |
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Greetings.
Dumb-ass question of the week:
Which way does the prop governor cable work? That is, when you pull the control knob out, does the pitch on the propellor increase or decrease?
Im installing the MT governor from Vans. It looks like I will have to cut the exquisitely twisted safety wire on teh unit to allow me to rotate the case around and point the control arm up. If I dont do this, the Vans support bracket wont fit. The control arm on the governor is spring loaded, presumably so that when my cable falls off, the prop pitch goes to the minimum value, allowing full power and a safe return to earth. Given that, with the control arm positioned upward, I will have to pull on the cable knob to increase the prop pitch. Is that how its supposed to be?
Still lost in a fixed-pitch world,
Erich Weaver
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klwerner(at)comcast.net
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| Posted: Mon Apr 03, 2006 3:59 pm Post subject: prop governor control |
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Pull Knob out =3D Increases pitch to high pitch =3D Low RPM
Push Knob in =3D Decreases pitch to low pitch =3D High RPM
do not archive
---
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Hopperdhh(at)aol.com
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| Posted: Mon Apr 03, 2006 4:02 pm Post subject: prop governor control |
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Erich,
The prop cable does not control pitch directly, but RPM. Pushing the knob
in causes more RPM, pulling the knob out reduces RPM. So that means that
pulling on the cable increases pitch. But, its better to think in terms of RPM.
Dan
RV-7A 200hp constant speed prop -- flying 150 hrs
In a message dated 4/3/2006 6:51:04 P.M. Eastern Standard Time,
erichweaver(at)cox.net writes:
Greetings.
Dumb-ass question of the week:
Which way does the prop governor cable work? That is, when you pull the
control knob out, does the pitch on the propellor increase or decrease?
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skylor4(at)yahoo.com
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| Posted: Mon Apr 03, 2006 6:03 pm Post subject: prop governor control |
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The MT governors DO NOT come from Van's clocked
properly. I had to reclock mine as well.
Consider it an excercise in safety wire practice...
--- Pat Hatch <pat_hatch(at)msn.com> wrote:
[quote]
<pat_hatch(at)msn.com>
Erich,
The way to think about it is that you are actually
controlling RPM, not
pitch, although indirectly pitch will also be
changed. So, full forward is
maximum RPM, pulling the knob out decreases RPM. As
long as you don't move
the control, the RPM should stay constant, although
the pitch may change as
you increase or decrease airspeed.
The MT governor should have come from Vans clocked
properly for an RV, but
it can also be re-clocked if necessary. You may
have to call Vans or go to
the MT web site to get the instructions on how to
re-clock the control.
Basically, you want the cable to be 90 degrees to
the governor lever at
mid-range in governor movement. Check to see that
you have the support
bracket oriented properly.
And the answer to your question is "yes": pulling
the control cable aft
will decrease RPM and increase pitch and the lever
is spring-loaded to the
max RPM position.
Pat Hatch
RV-6
RV-7
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