Today's Message Index:
----------------------
1. 04:08 AM - Re: How to install a hobbs/tach? (A. Dennis Savarese)
2. 11:22 AM - Re: How to install a hobbs/tach? (Looigi)
3. 01:37 PM - Re: Re: How to install a hobbs/tach? (\)
4. 07:44 PM - Re: Re: How to install a hobbs/tach? (Walter Lannon)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: How to install a hobbs/tach? |
Oil dilution port is an INPUT to the oil pump. Not an OUTPUT. Find the oil pressure
line coming the oil pump and going to the triple instrument in the cockpit.
It is a flexible hose.
Dennis
Sent from my iPad
> On Dec 9, 2018, at 11:11 PM, 1906 <zmadwolf@gmail.com> wrote:
>
>
> Is it possible to install some sort oil pressure switch on these?
> My mechanic thought he had it, connected to I believe the oil dilution port but
it didn't pick up enough pressure for the switch there...
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=486201#486201
>
>
>
>
>
>
>
>
>
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: How to install a hobbs/tach? |
Can I ask a stupid question..... Why would you want to?
My Yak is in a syndicate of 9 people, so we need to track flying time so Rob can
send each of us his monthly hate mail.... the bill.
Given that the Yak needs a lot of time to get the engine oil up to temperature,
especially in winter, I didn't want to use an oil pressure switch. I needed
to record flight time, not engine time because I didn't want guys to try and save
themselves a few cents by short cutting the warm up only to cost us big bucks
on engines.
I installed a Hobbs and a pressure switch. The Hobbs has its own power supply,
through a circuit breaker straight from the master switch and is turned on by
a small pressure switch plumbed into the pitot system. There was a convenient
unused pipe behind the back seat where some sort of "flight data recorder" once
was, and I just plugged into that. When we were doing the bi-annual pitot
test, I adjusted the switch to come on at about 60km/h.
If this sounds a solution to your problem, I can dig out the details of the switch
I used.
I hope this helps,
Chris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=486211#486211
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: How to install a hobbs/tach? |
At the Collings Foundation, the B-24 Hobbs was hooked up to the landing gea
r strut. =C2-With strut extended a switch powered the Hobbs meter. =C2-
The FAA seems to be happy with that.Jim "Pappy" Goolsby
-----Original Message-----
From: Looigi <cdoburton@gmail.com>
Sent: Mon, Dec 10, 2018 2:23 pm
Subject: Yak-List: Re: How to install a hobbs/tach?
Can I ask a stupid question..... Why would you want to?
My Yak is in a syndicate of 9 people, so we need to track flying time so Ro
b can send each of us his monthly hate mail.... the bill.
Given that the Yak needs a lot of time to get the engine oil up to temperat
ure, especially in winter, I didn't want to use an oil pressure switch.=C2
- I needed to record flight time, not engine time because I didn't want g
uys to try and save themselves a few cents by short cutting the warm up onl
y to cost us big bucks on engines.
I installed a Hobbs and a pressure switch.=C2- The Hobbs has its own powe
r supply, through a circuit breaker straight from the master switch and is
turned on by a small pressure switch plumbed into the pitot system.=C2- T
here was a convenient unused pipe behind the back seat where some sort of "
flight data recorder" once was, and I just plugged into that.=C2- When we
were doing the bi-annual pitot test, I adjusted the switch to come on at a
bout 60km/h.
If this sounds a solution to your problem, I can dig out the details of the
switch I used.
I hope this helps,
Chris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=486211#486211
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
S -
WIKI -
-
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
Message 4
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: How to install a hobbs/tach? |
Looigi;
While I have no concern with your choice for activating the Hobbs meter I do
have a problem with your choice of power supply.
The battery master switch is there to activate the battery master relay
which in turn powers the bus. None of the bus load is carried through the
switch which is sized for it's primary purpose only. The load you are
adding may not be enough to cause a problem but I believe you are breaking a
cardinal rule in aircraft electrical practice.
Since operation of the entire electrical system depends on the master relay
the loss of it's power supply (the switch) means total elec. failure. Any
added elec. load should always be taken directly from the bus never from the
master switch.
Walt
-----Original Message-----
From: Looigi
Sent: Monday, December 10, 2018 11:21 AM
Subject: Yak-List: Re: How to install a hobbs/tach?
Can I ask a stupid question..... Why would you want to?
My Yak is in a syndicate of 9 people, so we need to track flying time so Rob
can send each of us his monthly hate mail.... the bill.
Given that the Yak needs a lot of time to get the engine oil up to
temperature, especially in winter, I didn't want to use an oil pressure
switch. I needed to record flight time, not engine time because I didn't
want guys to try and save themselves a few cents by short cutting the warm
up only to cost us big bucks on engines.
I installed a Hobbs and a pressure switch. The Hobbs has its own power
supply, through a circuit breaker straight from the master switch and is
turned on by a small pressure switch plumbed into the pitot system. There
was a convenient unused pipe behind the back seat where some sort of "flight
data recorder" once was, and I just plugged into that. When we were doing
the bi-annual pitot test, I adjusted the switch to come on at about 60km/h.
If this sounds a solution to your problem, I can dig out the details of the
switch I used.
I hope this helps,
Chris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=486211#486211
---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|