Today's Message Index:
----------------------
1. 06:58 AM - Re: longest pneumatic line (Warren Hill)
2. 03:52 PM - M14P sporadic roughness (Byron Fox)
3. 04:39 PM - Re: M14P sporadic roughness (Anthony Savarese)
Message 1
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| Subject: | Re: longest pneumatic line |
Walt,
The one area for the CJ where having this more robust tubing is mandatory is the
run from the deposit filter (snot valve) to the input to the firewall pressure
reducing (pop-it) valve. The line from the compressor banjo fitting to the
snot valve on most CJs is original and stainless steel. The output of the M-14P
compressor is well beyond 1,200 psi. Have not measured the Housai compressor,
but I expect its something similar. After the pop-it valve, the system pressure
is reduced to about 650 psi. This is probably still too high to be safe for
soft aluminum with countless bends and thin areas at the base of the flare.
Another area where the pneumatic system of the CJ could be designed better is total
run from the compressor to the input check valve of the pop-it valve. The
air coming out of the compressor is very hot. Over time, this hot, oily air invariably
degrades the check valve Chinese rubber disc and to a lesser degree
the more robust Viton disc that Doug Sapp provides. Putting some supported extra
bends in that one line helps cool the air before it reaches the first check
valve. For my CJ, doing has extended the time between rebuilds. Easy to do and
plenty of room between the edge of the firewall and the cowling.
Warren
> On Jul 23, 2019, at 8:25 PM, Walter Lannon <wlannon@shaw.ca> wrote:
>
>
> Hi Warren;
>
> That is actually a pretty fair price for 1/4" X 0.049" 5052!
>
> The standard and most used 1/4" X 0.035" (while a whole lot cheaper) actually
does not meet the strength requirements of the stock 6mm X 1mm CJ tubing.
Assuming of course that the material spec. is equivalent and I have no reason
to believe otherwise.
>
> I used to maintain a stock of 1/4" X 0.049" for a batch of Harvards & T6's. Required
for the 1200 psi hydraulic system. Sometimes had a hard time finding
it!
>
> Cheers;
> Walt
>
> -----Original Message----- From: Warren Hill
> Sent: Tuesday, July 23, 2019 4:01 PM
> To: yak-list@matronics.com
> Subject: Re: Yak-List: longest pneumatic line
>
>
> Jon,
>
> Aircraft Spruce has exceptionally high quality inch 5052-0 aluminum tubing that
is almost as stiff as stainless steel.
>
> Here are the numbers:
>
> OD: 0.250
> ID: 0.152
> Thickness: 0.049
> Length: Comes is 6 ft. sections, but will ship this in 12 ft. sections if you
want.
> Part Number: 03-39250-12
> Price: $28.80 for 6 ft.
> $57.60 for 12 feet.
> Web: https://www.aircraftspruce.com/catalog/mepages/alumtube_5052.php
>
> The advantage of using tubing is that 37 flaring tools are readily available.
Imperial stopped making a 37 flaring tool for 6 mm tubing a few years back.
>
> Hope this helps.
>
> Warren Hill
> N464TW
> Mesa, AZ
>
>
>
>> On Jul 23, 2019, at 11:41 AM, Jon Boede <jonboede@hotmail.com> wrote:
>>
>> I have a chance to get some original pneumatic tubing into a container coming
from Poland.
>>
>> The guy is going to send straight pieces and wants to know how long... I told
him at least two pieces 4 meters long. Should I tell him 5? Anybody have a
feel for what the longest run of tubing is in the CJ? I want to just have stock
for the future so there's not something specific I'm fixing now.
>>
>> Jon
>
>
>
>
>
> ---
> This email has been checked for viruses by Avast antivirus software.
> https://www.avast.com/antivirus
>
>
>
>
Message 2
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| Subject: | M14P sporadic roughness |
A few weeks back I wrote with a puzzling problem that I thought might be a s
ticky valve.
Dennis Savarese offered the following:
=9CAdd a quart of Marvel Mystery Oil to the oil and go fly the airplan
e for an hour or two.?? The MMO tends to clean the valve stems and valve gui
des of the varnish buildup that causes valve(s) to stick. Even a couple of q
uarts won't hurt it.
>
>>> Dennis=9D
So, I did as instructed. Problem solved!! Gotta love MMO=9D=A4=EF=B8=8F
=9D=A4=EF=B8=8F=9D=A4=EF=B8=8F=9D=A4=EF=B8=8F.
Thanks Dennis.
Blitz Fox
415-307-2405
Message 3
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| Subject: | Re: M14P sporadic roughness |
Glad it worked. That=99s why it=99s call Marvel MYSTERY oil. =F0
=9F=98=8A
Dennis
Sent from my iPhone
> On Jul 26, 2019, at 6:45 PM, Byron Fox <byronmfox@gmail.com> wrote:
>
> A few weeks back I wrote with a puzzling problem that I thought might be a
sticky valve.
>
> Dennis Savarese offered the following:
>
> =9CAdd a quart of Marvel Mystery Oil to the oil and go fly the airpl
ane for an hour or two.?? The MMO tends to clean the valve stems and valve g
uides of the varnish buildup that causes valve(s) to stick. Even a couple of
quarts won't hurt it.
>>
>>>> Dennis=9D
>
> So, I did as instructed. Problem solved!! Gotta love MMO=9D=A4=EF=B8=8F
=9D=A4=EF=B8=8F=9D=A4=EF=B8=8F=9D=A4=EF=B8=8F.
>
> Thanks Dennis.
>
> Blitz Fox
> 415-307-2405
>
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