Today's Message Index:
----------------------
1. 04:03 PM - Designing a circuit question (Dennis & Anne Glaeser)
2. 05:12 PM - Re: Designing a circuit question (David)
3. 05:54 PM - Re: Designing a circuit question (Mike Welch)
4. 08:51 PM - Re: Designing a circuit question (Dennis & Anne Glaeser)
5. 09:00 PM - Re: Designing a circuit question (Dennis & Anne Glaeser)
6. 09:43 PM - Re: Re: Designing a circuit question (David)
Message 1
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Subject: | Designing a circuit question |
I have an in flight adjustable IVO prop. What I'd like to have is a light
that indicates when I get to the flat pitch 'stop' - without adding rings
and brushes.
For those who aren't familiar with the IVO, the adjustment is made by a
motor driving a jack-screw that moves a collar which torques a rod embedded
in the blades. There are no electrical stops, just a rubber washer at each
end of the run. When the collar hits the end, the motor stalls. The rubber
washer provides a softer stall which is a bit easier on the gears driving
the jack screw. A 10A CB is the ultimate 'stop'. Not elegant, but it
works.
On the ground, before starting the engine, it's easy to verify the prop is
in fine pitch by listening to the motor. The problem is before landing,
when I'd like to have the prop in fine pitch, it has to be done by guess and
feel, or just hold the switch until the CB pops - which is not a good thing
to do on a regular basis.
So, what I'd like is a circuit that can sense an amperage spike - going over
9A would be perfect - and turn on a light (LED of course :-) The ramp up to
9A is steep - goes from 5-6A to 9A very quickly (if that helps).
I can build the circuit, I just don't know how to design it.
Thanks in advance,
Dennis Glaeser
Message 2
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Subject: | Re: Designing a circuit question |
There is a little IC with three pins that you could put in circuit with
the system. It tells you the amperage passing through it. IIRC it's
about $6. I can look up the part number on the ones I have here somewhere...
David M.
Dennis & Anne Glaeser wrote:
>
> I have an in flight adjustable IVO prop. What Id like to have is a
> light that indicates when I get to the flat pitch stop without
> adding rings and brushes.
>
> For those who arent familiar with the IVO, the adjustment is made by
> a motor driving a jack-screw that moves a collar which torques a rod
> embedded in the blades. There are no electrical stops, just a rubber
> washer at each end of the run. When the collar hits the end, the motor
> stalls. The rubber washer provides a softer stall which is a bit
> easier on the gears driving the jack screw. A 10A CB is the ultimate
> stop. Not elegant, but it works.
>
> On the ground, before starting the engine, its easy to verify the
> prop is in fine pitch by listening to the motor. The problem is before
> landing, when Id like to have the prop in fine pitch, it has to be
> done by guess and feel, or just hold the switch until the CB pops
> which is not a good thing to do on a regular basis.
>
> So, what Id like is a circuit that can sense an amperage spike
> going over 9A would be perfect and turn on a light (LED of course
> :-) The ramp up to 9A is steep goes from 5-6A to 9A very quickly (if
> that helps).
>
> I can build the circuit, I just dont know how to design it.
>
> Thanks in advance,
>
> Dennis Glaeser
>
>
Message 3
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Subject: | Designing a circuit question |
Dennis=2C
I have the exact same IvoProp setup. They make an option for this functi
on=2C if I'm not mistaken.
I just went to their website=2C and checked out what they had. They call
it a prop speed govenor. Cost is $320.
Yeah=2C I'd love to build one of these=2C too!! If anyone can come up wi
th a design=2C I could build it!!
Maybe there could be a line of LEDs that reflect the currect load in each
direction of travel.
Mike Welch
From: glaesers@wideopenwest.com
Subject: AeroElectric-List: Designing a circuit question
I have an in flight adjustable IVO prop. What I=92d like to have is a ligh
t that indicates when I get to the flat pitch =91stop=92 ' without adding
rings and brushes.
For those who aren=92t familiar with the IVO=2C the adjustment is made by a
motor driving a jack-screw that moves a collar which torques a rod embedde
d in the blades. There are no electrical stops=2C just a rubber washer at
each end of the run. When the collar hits the end=2C the motor stalls. Th
e rubber washer provides a softer stall which is a bit easier on the gears
driving the jack screw. A 10A CB is the ultimate =91stop=92. Not elegant
=2C but it works.
On the ground=2C before starting the engine=2C it=92s easy to verify the pr
op is in fine pitch by listening to the motor. The problem is before landi
ng=2C when I=92d like to have the prop in fine pitch=2C it has to be done b
y guess and feel=2C or just hold the switch until the CB pops ' which is
not a good thing to do on a regular basis.
So=2C what I=92d like is a circuit that can sense an amperage spike ' goi
ng over 9A would be perfect ' and turn on a light (LED of course :-) The
ramp up to 9A is steep ' goes from 5-6A to 9A very quickly (if that help
s).
I can build the circuit=2C I just don=92t know how to design it.
Thanks in advance=2C
Dennis Glaeser
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Message 4
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Subject: | RE: Designing a circuit question |
Mike,
I've seen their speed governor on their website, but don't know how well it
works. Making a decent speed controller is more involved and expensive than
I want.
All I really want is a 'limit sensor' for the pitch stops.
Some IVO owners have installed an ammeter, which is an option but I'm hoping
for something simpler - just a light.
Dennis
----------
Mike Welch (mdnanwelch7@hotmail.com)
Date:
Sat Apr 17 - 5:54 PM
Dennis
I have the exact same IvoProp setup. They make an option for this
function if I'm not mistaken.
I just went to their website and checked out what they had. They call it
a prop speed govenor. Cost is $320.
Yeah I'd love to build one of these too!! If anyone can come up with a
design I could build it!!
Maybe there could be a line of LEDs that reflect the currect load in each
direction of travel.
Mike Welch
Message 5
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Subject: | RE: Designing a circuit question |
David,
Can the IC do any switching based on the amperage it senses?
Dennis
------------------
From: David (ainut@hiwaay.net)
There is a little IC with three pins that you could put in circuit with
the system. It tells you the amperage passing through it. IIRC it's
about $6. I can look up the part number on the ones I have here somewhere...
David M.
Message 6
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Subject: | Re: RE: Designing a circuit question |
Not this one. That would have to be another circuit. A $1
microprossesser could handle a $17 relay to do that job.
David
Dennis & Anne Glaeser wrote:
> --> AeroElectric-List message posted by: "Dennis& Anne Glaeser"<glaesers@wideopenwest.com>
>
> David,
>
> Can the IC do any switching based on the amperage it senses?
>
> Dennis
>
> ------------------
> From: David (ainut@hiwaay.net)
>
> There is a little IC with three pins that you could put in circuit with
> the system. It tells you the amperage passing through it. IIRC it's
> about $6. I can look up the part number on the ones I have here somewhere...
>
> David M.
>
>
>
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