Today's Message Index:
----------------------
1. 07:15 AM - Re: Which Oil Pressure Switch? (Mudfly)
2. 01:16 PM - Re: Re: Which Oil Pressure Switch? (Neal George)
3. 01:18 PM - Re: Re: Which Oil Pressure Switch? (Ken Ryan)
4. 01:29 PM - Re: Re: Which Oil Pressure Switch? (Charlie England)
Message 1
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| Subject: | Re: Which Oil Pressure Switch? |
Hello Igor,
I'm currently researching ways to activate my hobbs meter. Probably not
a big deal, but I would prefer something other than using a feed from
the oil pressure. Much like the electrical failure points discussed on this
list, I see the extra oil fittings as possible failure points. I know that's
primarily used but was wondering with modern avionics could there be another way
to activate the hobbs?
Also, are you using a analog or LCD meter? I originally planned the
Honeywell, 2 pin LCD unit. However, I realized the unit would only display
the digits when it was activated by oil pressure or other device used to
complete the circuit. I would like to see the digits when battery is
switched on.
I switched to the 3 pin LCD unit. Honeywell LM-HH3AS-H21. The pins are
positive, negative and enable. https://www.digikey.com/en/products/detail/honeywell-sensing-and-productivity-solutions/LM-HH3AS-H21/5069695
It will be powered off the main power bus when battery is switched on.
I now just need to figure out how to power the enable portion..other
than oil pressure. I found an activation switch that uses pitot pressure,
but it does not activate until 27 mph. Don't love that either:)
https://www.edmo.com/product/AEROMETER/hourmeter-airspeed-switch-stc-aerometer
Any ideas from the group?
Shawn
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510642#510642
Message 2
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| Subject: | Re: Which Oil Pressure Switch? |
Shawn -
Have you considered a vacuum switch in the intake manifold? Activates when the
engine starts, no threat or mess if it leaks.
Neal
On Apr 17, 2023, at 4:18 PM, Mudfly <shawntedwards@hotmail.com> wrote:
I found an activation switch that uses pitot pressure,
but it does not activate until 27 mph. Don't love that either:)
https://www.edmo.com/product/AEROMETER/hourmeter-airspeed-switch-stc-aerometer
Any ideas from the group?
Shawn
Message 3
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| Subject: | Re: Which Oil Pressure Switch? |
I wonder if there is a vibration sensor that would be appropriate? I know
that Sterling has added that feature to their B2B chargers.
On Mon, Apr 17, 2023 at 6:18=AFAM Mudfly <shawntedwards@hotmail.com>
wrote:
> shawntedwards@hotmail.com>
>
> Hello Igor,
> I'm currently researching ways to activate my hobbs meter. Probably not
> a big deal, but I would prefer something other than using a feed from
> the oil pressure. Much like the electrical failure points discussed on
> this
> list, I see the extra oil fittings as possible failure points. I know
> that's
> primarily used but was wondering with modern avionics could there be
> another way to activate the hobbs?
> Also, are you using a analog or LCD meter? I originally planned the
> Honeywell, 2 pin LCD unit. However, I realized the unit would only
> display
> the digits when it was activated by oil pressure or other device used to
> complete the circuit. I would like to see the digits when battery is
> switched on.
> I switched to the 3 pin LCD unit. Honeywell LM-HH3AS-H21. The pins are
> positive, negative and enable.
> https://www.digikey.com/en/products/detail/honeywell-sensing-and-producti
vity-solutions/LM-HH3AS-H21/5069695
> It will be powered off the main power bus when battery is switched on.
> I now just need to figure out how to power the enable portion..other
> than oil pressure. I found an activation switch that uses pitot pressur
e,
> but it does not activate until 27 mph. Don't love that either:)
>
> https://www.edmo.com/product/AEROMETER/hourmeter-airspeed-switch-stc-aero
meter
> Any ideas from the group?
> Shawn
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=510642#510642
>
>
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Message 4
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| Subject: | Re: Which Oil Pressure Switch? |
On 4/17/2023 3:15 PM, Neal George wrote:
>
> Shawn -
> Have you considered a vacuum switch in the intake manifold? Activates when
the engine starts, no threat or mess if it leaks.
>
> Neal
>
> On Apr 17, 2023, at 4:18 PM, Mudfly <shawntedwards@hotmail.com> wrote:
>
> I found an activation switch that uses pitot pressure,
> but it does not activate until 27 mph. Don't love that either:)
> https://www.edmo.com/product/AEROMETER/hourmeter-airspeed-switch-stc-aerometer
> Any ideas from the group?
> Shawn
FWIW, my ancient 1st-gen Dynon D10-EMS doesn't start the clock until the
plane is moving. No idea what the threshold is or how it's measured, but
it seems likely that it's airspeed dependent since the D10 doesn't talk
to any other instruments in the a/c.
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