Today's Message Index:
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1. 08:27 AM - Re: Main Air Tank Install. (Bitterlich, Mark G CIV NAVAIR, WD)
2. 08:44 AM - Re: Main Air Tank Install. (Justin Drafts)
Message 1
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| Subject: | Main Air Tank Install. |
FYI, a friend did a home-brew replacement of the pressure relief valve on an otherwise
stock system in a 50. During a test flight the system reached about
62 atmos, or about 170 (or so) PSI over the maximum recommended pressure setting
of 50 Atmos, or 725 PSI. When he lowered the gear, he blew the chevron seals
out of one of the main landing gear actuators. I never did ask him how old
they were, so there might have been other factors involved. I too lost chevron
seals in my 50, but in my case it was from following advise posted on this
list of "injecting" air-tool oil into the system. Later, I took one of those
seals and sprayed air tool oil on them directly, and within a week it was swollen
and soft. Lesson learned.
Additionally, adjusting the pressure relief valve to a higher setting puts more
strain on all system components, which includes the engine air-compressor, unless
of course you have installed one of several methods to "unload" the compressor
in-flight, which Richard Goode has discussed, and which I have also seen
used on several Yaks and Sukhoi's as well. Thus I would agree with Doug that
increasing system pressure over the maximum design recommendation given by the
aircraft manufacturer might have catastrophic circumstances, but at the very
least will decrease component life.
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Ernest Martinez
Sent: Wednesday, April 01, 2015 5:17 PM
Subject: Re: Yak-List: Main Air Tank Install.
I didn't give that much thought. I was just thinking about the tubing. I will stay
under 60 BAR
Thanks
Ernie
On Wed, Apr 1, 2015 at 4:29 PM, doug sapp <dougsappllc@gmail.com> wrote:
Ernie,
I'd be a bit cautious about "turning up your pressure relief valve". The other
components in the system are made to run at 45 to 50 atms, cranking it up in
excess of that may cause failures in other components, especially if your using
any additives in the pneumatic system. Standard check valve rubber discs will
start to "extrude" at about 60 atms, less if your using a additive.
Good luck,
Doug
On Wed, Apr 1, 2015 at 12:47 PM, Ernest Martinez <erniel29@gmail.com> wrote:
Here is the tank installed. Stock tank is still in airplane, since I'm testing
and didn't feel like taking out smoke system and battery. Can still get items
in through port side door. Tank can be removed in about 2 minutes. Filled up
and ready to test. I turned up my pressure relief valve since there is no fear
of overfilling system now. Nice to have the extra reserve air.
Ernie
Inline image 2Inline image 1Inline image 3
Message 2
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| Subject: | Re: Main Air Tank Install. |
Good advice Mark, yes lessons learned.
I have my CJ's air system set for 47 ATM, use castor oil, have new
restrictors in LG lines (thanks Doug Sapp) and it seems content to work
very well on that.
Justin
N280NC
On Thu, Apr 2, 2015 at 8:27 AM, Bitterlich, Mark G CIV NAVAIR, WD <
mark.bitterlich@navy.mil> wrote:
> mark.bitterlich@navy.mil>
>
> FYI, a friend did a home-brew replacement of the pressure relief valve on
> an otherwise stock system in a 50. During a test flight the system
> reached about 62 atmos, or about 170 (or so) PSI over the maximum
> recommended pressure setting of 50 Atmos, or 725 PSI. When he lowered the
> gear, he blew the chevron seals out of one of the main landing gear
> actuators. I never did ask him how old they were, so there might have been
> other factors involved. I too lost chevron seals in my 50, but in my case
> it was from following advise posted on this list of "injecting" air-tool
> oil into the system. Later, I took one of those seals and sprayed air tool
> oil on them directly, and within a week it was swollen and soft. Lesson
> learned.
>
> Additionally, adjusting the pressure relief valve to a higher setting puts
> more strain on all system components, which includes the engine
> air-compressor, unless of course you have installed one of several methods
> to "unload" the compressor in-flight, which Richard Goode has discussed,
> and which I have also seen used on several Yaks and Sukhoi's as well. Thus
> I would agree with Doug that increasing system pressure over the maximum
> design recommendation given by the aircraft manufacturer might have
> catastrophic circumstances, but at the very least will decrease component
> life.
>
> Mark
>
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com [mailto:
> owner-yak-list-server@matronics.com] On Behalf Of Ernest Martinez
> Sent: Wednesday, April 01, 2015 5:17 PM
> To: yak-list
> Subject: Re: Yak-List: Main Air Tank Install.
>
> I didn't give that much thought. I was just thinking about the tubing. I
> will stay under 60 BAR
>
> Thanks
>
> Ernie
>
> On Wed, Apr 1, 2015 at 4:29 PM, doug sapp <dougsappllc@gmail.com> wrote:
>
>
> Ernie,
> I'd be a bit cautious about "turning up your pressure relief
> valve". The other components in the system are made to run at 45 to 50
> atms, cranking it up in excess of that may cause failures in other
> components, especially if your using any additives in the pneumatic
> system. Standard check valve rubber discs will start to "extrude" at about
> 60 atms, less if your using a additive.
>
> Good luck,
>
> Doug
>
> On Wed, Apr 1, 2015 at 12:47 PM, Ernest Martinez <
> erniel29@gmail.com> wrote:
>
>
> Here is the tank installed. Stock tank is still in
> airplane, since I'm testing and didn't feel like taking out smoke system
> and battery. Can still get items in through port side door. Tank can be
> removed in about 2 minutes. Filled up and ready to test. I turned up my
> pressure relief valve since there is no fear of overfilling system now.
> Nice to have the extra reserve air.
>
> Ernie
>
>
> Inline image 2Inline image 1Inline image 3
>
>
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