Today's Message Index:
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1. 12:20 PM - Lower Elevator cable rub (Stanley A Challgren)
2. 12:24 PM - Lower Elevator cable rub (Stanley A Challgren)
3. 12:57 PM - Re: Lower Elevator cable rub (List Mail)
4. 12:57 PM - Re: Lower Elevator cable rub (MacDonald Doug)
5. 07:09 PM - fuel pickups ? (dashwood)
Message 1
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| Subject: | Lower Elevator cable rub |
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 2
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| Subject: | Lower Elevator cable rub |
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 3
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| Subject: | Re: Lower Elevator cable rub |
Stanley.
That sounds like a reasonable fix, but I would first find out why the cable
rubs in the first place. Mine is about two inches away from the aft baggage
compartment.
My bell crank also hits the seat back and I just bent the channel out of the
way.
I have about 150 hours and no issues with the bell crank or the bungee cord.
I put a cable wheel at the end of my bungee so that it wouldn't rub on the
cable. It works a lot smoother than just the hook on the end.
Mark S.
701/912ULS
do not archive
--------------------------------------------------
From: "Stanley A Challgren" <challgren@mac.com>
Sent: Tuesday, October 12, 2010 12:11 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 4
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| Subject: | Re: Lower Elevator cable rub |
Stan, I had similar cable interference issues to what you are describing. I ended
up cutting the elevator belcrank off of the flapperon torque tube and building
it's own mount. The mount ties into the back of the tunnel at the front
and ties into the channel that supports the back of the torque tube at the rear.
Whit this is setup I have eliminated the elevator cable tightening effect of the
flapperons. You also need to build a push rod for the elevator that has rod
ends on it as the push rod will need to move in more than one axis.
I placed my separation bungee in the correct location so that it keeps the cable
from contacting the bottom of the baggage compartment. It is actually hooked
on one of my turnbuckle eyelets.
As for the channel on the back of the seat, loosen the top elevator cable a little
and tighten the bottom(as observed from the elevator). This will move the
belcrank until it clears the seat back.
The elevator rigging is about the poorest documented part of the CH-701. After
nearly twenty-five years you'd think they'd have come up with a bit better instructions.
Everyone needs to keep in mind that while my plane has completed it's final inspection,
I have not yet flown with this arrangement. Your milage may vary. Once
I have some time on my plane and have verified that this setup is bullet proof,
I will do up a little description for Jon to put in the newsletter.
Do Not Archive
Doug MacDonald
CH-701 C-GBQX
NW Ontario, Canada
Waiting on paperwork
--- On Tue, 10/12/10, Stanley A Challgren <challgren@mac.com> wrote:
> From: Stanley A Challgren <challgren@mac.com>
> Subject: Zenith701801-List: Lower Elevator cable rub
> 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 5
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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
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