Today's Message Index:
----------------------
1. 01:25 AM - Re: fuel pickups ? (roy szarafinski)
2. 03:26 AM - Re: fuel pickups ? (kmccune)
3. 05:00 AM - Re: fuel pickups ? (dashwood)
4. 05:47 AM - Re: fuel pickups ? (MacDonald Doug)
5. 06:36 AM - Re: fuel pickups ? (BobKat)
6. 10:43 AM - Re: Lower Elevator cable rub (Les Goldner)
7. 04:30 PM - Re: Lower Elevator cable rub (ruruny@aol.com)
Message 1
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| Subject: | Re: fuel pickups ? |
Ross, the plans show a finger strainer fitting at the fuel outlet
which is at the back on the inboard side of the tank just above the
drain.
Roy
On Oct 12, 2010, at 10:07 PM, dashwood wrote:
> >
>
> I purchased my bird so do not have the benefit of seeing this part
> installed. i am wondering what the 701 wing tank fuel pickup looks
> like. and where it is normally. the drain is inboard at the rear.
> the fill neck is outboard and forward. the elec fuel gage tube runs
> about 4" back of front wall from the inboard face..
> Is it just a hole/fitting in the side or a upright tube on top of
> the drain with holes so one piece of debris can't plug it instantly.
> I had parts of the fill spout from the gas can i was using come off
> the other day. ( into the tank) it was the special spring loaded
> auto shutoff type. after much fishing i got it + spring attached
> out. but on the last flight this tank was not gravity feeding as
> before. with the tanks full as this one was i never had to worry
> about fuel flow. after the first time switching to this tank in
> flight the engine started to stumble. a quik check of the glass on
> the cabin fuel filter showed it empty. i flipped on the elec. pump
> and it filled up and ran smooth. several cycles like this showed
> some improvement. but not back to the gravity feed level of the
> other side.
> could i have damaged anything in the tank fishing around with a
> heavy wire? there was about 6 L left in the tank while i was looking
> about. the borescope i was using didn't have enough strength or
> clarity to see the inboard side or back inboard corners. so i can't
> get a look at the pickup from here.
> this was not as scary as it sound as i had lots of fuel in the other
> tank and was flight testing for this very problem before in was one.
>
> --------
> Ross Aalexander: CH701 driver 912ul 398tt
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=315505#315505
>
>
Message 2
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| Subject: | Re: fuel pickups ? |
See attached photo of right side tank, as viewed from cabin.
Kevin
do not archive
--------
Always do what you are afraid to do.
R.W. Emerson (1803-1882)
"Real freedom is the sustained act of being an individual." WW - 2009
"Life is a good deal...it's worth it"
Dorothy McCune
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=315532#315532
Attachments:
http://forums.matronics.com//files/701_fuel_tank_177.jpg
Message 3
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| Subject: | Re: fuel pickups ? |
thanks guys. this is just what i was looking for and suspected. I am thinking the
screen may have been crunched some. next question. can it be serviced by removing
the wing fairings.. removing the tank would require major surgery on the
wing :( I am getting more crud in the cabin fuel filter from muckin about inside
this tank. from stirring up sediments or compromising this screen.
--------
Ross Aalexander: CH701 driver 912ul 398tt
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=315535#315535
Message 4
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| Subject: | Re: fuel pickups ? |
Ross, the fuel pickup in the tank is essentially a pipe thread bung welded to the
sidewall of the tank near the bottom back corner. Standard proceedure is to
thread a finger screen into this bung and then the barb fitting threads into
the finger screen. If there is a finger screen in place (two inch long cylinder
of metal screen) then the incident you are decribing should not have affected
your fuel flow.
I don't remember if the 701 plans show the installation of a finger screen or not
but I know the 750 does since I'm helping to build one of those now. If your
plane doesn't have finger screens it would be a good idea to install them.
Doug MacDonald
CH-701 C-GBQX
NW Ontario, Canada
Waiting on paperwork, ARGH!!!
Do not archive
--- On Tue, 10/12/10, dashwood <dashwoodlock@hotmail.com> wrote:
> From: dashwood <dashwoodlock@hotmail.com>
> I purchased my bird so do not have the benefit of seeing
> this part installed. i am wondering what the 701 wing tank
> fuel pickup looks like. and where it is normally. the drain
> is inboard at the rear. the fill neck is outboard and
> forward. the elec fuel gage tube runs about 4" back of front
> wall from the inboard face..
> Is it just a hole/fitting in the side or a upright
> tube on top of the drain with holes so one piece of
> debris can't plug it instantly.
> I had parts of the fill spout from the gas can i was using
> come off the other day. ( into the tank) it was the special
> spring loaded auto shutoff type. after much fishing i
> got it + spring attached out. but on the last flight
> this tank was not gravity feeding as before. with the tanks
> full as this one was i never had to worry about fuel
> flow. after the first time switching to this tank in flight
> the engine started to stumble. a quik check of the glass on
> the cabin fuel filter showed it empty. i flipped on the
> elec. pump and it filled up and ran smooth. several cycles
> like this showed some improvement. but not back to the
> gravity feed level of the other side.
> could i have damaged anything in the tank fishing around
> with a heavy wire? there was about 6 L left in the tank
> while i was looking about. the borescope i was using didn't
> have enough strength or clarity to see the inboard side or
> back inboard corners. so i can't get a look at the pickup
> from here.
> this was not as scary as it sound as i had lots of fuel in
> the other tank and was flight testing for this very problem
> before in was one.
>
> --------
> Ross Aalexander: CH701 driver 912ul 398tt
Message 5
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| Subject: | Re: fuel pickups ? |
You'll have to get at the fuel pickup opening in the tank to get at it to
put on a new fuel strainer screen. Yes, the 701 plans call for one. Even
if it is a bit bent up I can't see this stopping most of the flow from the
tank. Possible, I suppose. Are you sure that you got all the debris out
of the tank?
It might be possible to borrow or rent one of those flexible borescopes that
most A & P have access to to have a good look at the tank from the inside.
Basically it's a a physician's flexible sigmoidoscope . I've seen the
short ones (sigmoidoscope) and long ones (colonoscope) in the larger
aircraft repair shops and have been intrigued by them, as they are EXACTLY
the same as what I use (used) on humans before I retired. You could get a
great eyeball close up with one of those if you can borrow or steal one for
about 3 1/2 minutes!
When I built my plane I screwed up and didn't put an inspection plate to
access the pickup tube (or fuel sending gauges) in my tanks, so if there
isn't one on your plane, the only way to access the tube would be to cut an
inspection hole either on the underside or above it on the top. But I'd
sure look at it from the inside with a scope if possible before doing major
surgery like that..
--------------------------------------------------
From: "MacDonald Doug" <dougsnash@yahoo.com>
Sent: Wednesday, October 13, 2010 7:44 AM
Subject: Re: Zenith701801-List: fuel pickups ?
> <dougsnash@yahoo.com>
>
> Ross, the fuel pickup in the tank is essentially a pipe thread bung welded
> to the sidewall of the tank near the bottom back corner. Standard
> proceedure is to thread a finger screen into this bung and then the barb
> fitting threads into the finger screen. If there is a finger screen in
> place (two inch long cylinder of metal screen) then the incident you are
> decribing should not have affected your fuel flow.
>
> I don't remember if the 701 plans show the installation of a finger screen
> or not but I know the 750 does since I'm helping to build one of those
> now. If your plane doesn't have finger screens it would be a good idea to
> install them.
>
> Doug MacDonald
> CH-701 C-GBQX
> NW Ontario, Canada
>
> Waiting on paperwork, ARGH!!!
>
> Do not archive
>
> --- On Tue, 10/12/10, dashwood <dashwoodlock@hotmail.com> wrote:
>
>> From: dashwood <dashwoodlock@hotmail.com>
>
>> I purchased my bird so do not have the benefit of seeing
>> this part installed. i am wondering what the 701 wing tank
>> fuel pickup looks like. and where it is normally. the drain
>> is inboard at the rear. the fill neck is outboard and
>> forward. the elec fuel gage tube runs about 4" back of front
>> wall from the inboard face..
>> Is it just a hole/fitting in the side or a upright
>> tube on top of the drain with holes so one piece of
>> debris can't plug it instantly.
>> I had parts of the fill spout from the gas can i was using
>> come off the other day. ( into the tank) it was the special
>> spring loaded auto shutoff type. after much fishing i
>> got it + spring attached out. but on the last flight
>> this tank was not gravity feeding as before. with the tanks
>> full as this one was i never had to worry about fuel
>> flow. after the first time switching to this tank in flight
>> the engine started to stumble. a quik check of the glass on
>> the cabin fuel filter showed it empty. i flipped on the
>> elec. pump and it filled up and ran smooth. several cycles
>> like this showed some improvement. but not back to the
>> gravity feed level of the other side.
>> could i have damaged anything in the tank fishing around
>> with a heavy wire? there was about 6 L left in the tank
>> while i was looking about. the borescope i was using didn't
>> have enough strength or clarity to see the inboard side or
>> back inboard corners. so i can't get a look at the pickup
>> from here.
>> this was not as scary as it sound as i had lots of fuel in
>> the other tank and was flight testing for this very problem
>> before in was one.
>>
>> --------
>> Ross Aalexander: CH701 driver 912ul 398tt
>
>
>
Message 6
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| Subject: | Lower Elevator cable rub |
Stan,
I had the same issues. To stop the bellcrank from rubbing against the
seat-back I installed a piece of 1/8" "L" covered with thin rubber to stop
the bottom of the bellcrank from moving too far to the rear. To stop any
cable chafe I put a less-tense bungee on the lower elevator cable. 3-years
later this still works. The plane flies hands off.
Les
-----Original Message-----
From: owner-zenith701801-list-server@matronics.com
[mailto:owner-zenith701801-list-server@matronics.com] On Behalf Of Stanley A
Challgren
Sent: Tuesday, October 12, 2010 12:15 PM
Subject: Zenith701801-List: Lower Elevator cable rub
<challgren@mac.com>
701 Builders:
I refer to 7-C-0 of the 701 drawings. I have used a small bungee cord on
the upper elevator cable to keep the two cables from rubbing together as per
the note on the side of the page. However, the lower elevator cable still
rubs on the aft edge of the extended baggage compartment when the stick is
full forward; i.e. elevator in full down position. There are three rivets
that the cable catches on when aileron is applied in either direction. I am
looking for a solution and am considering reversing the rivets the cable
rubs on and installing a nylon rub strip so the cable will have something to
easily slide on. Any suggestions?
I recognize that the only time full forward stick might be used is in a
stall recovery but if the stick is lashed full forward when parked the cable
would likely vibrate and induce wear to the cable.
Also, the top of the Horizontal tail bellcrank (7C1-1) contacts the seat
back channel (7F6-5) when the stick is full forward and some distortion of
the channel occurs. Is this likely to cause a problem when the seat is
occupied or is it an acceptable interaction between the two items?
Stan Challgren 701/3300
Message 7
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| Subject: | Re: Lower Elevator cable rub |
For the belcrank hitting the back seat I made a stop at the elevator itsel
f and then when installing the control cables
adjusted them so the belcrank stops about a 1/4" from the seat back. For
the cable hitting the baggage area, had the
same thing the bungee pulls it down and to the side to keep it from rubbin
g.
See pic
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