Today's Message Index:
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1. 11:24 AM - Elevator cables (Oscar Zuniga)
2. 03:22 PM - One or the Othet? (Isablcorky@aol.com)
3. 07:15 PM - Re: unsubscribe (Larry Nelson)
Message 1
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Graham wrote:
>Does the tension vary between upper & lower cables at full deflection?
It sure does on 41CC. Matter of fact, the A&P who did the last annual on it
got worried about it and wanted me to take out the "slack" on the lower
cable. That is, until I pointed out to him that this was normal and if I
took out the slack when the elevator was in one position, the cable would be
overly tensioned when in the other.
>If so can this be avoided.
Yes; change the geometry of the elevator "idler" bellcrank behind the seat
as well as the relative lengths of the bellcrank arms with respect to the
bellcrank on the elevator. John Dilatush did this on "Mountain Piet" and
the cables maintain an even tension throughout the full range of travel,
both ways. You can see this in the second photo up from the bottom (and its
caption) here: http://www.flysquirrel.net/piets/John_piet.html
>Any way of stopping the top cable from rubbing on the L,E of tail plane?
See answer to above question ;o) However, it's only a perceived defect or
flaw. In operation, everything works just fine and slipping a piece of
aquarium air hose over the cable where it touches the LE of the horizontal
stabilizer, or applying some clear leading edge tape to the HS, will allay
your fears and protect the LE paint and fabric if that's what you're worried
about. 41CC has neither and is none the worse for wear so far. A picture
of the setup on 41CC, with the elevator in the 'up' position (lower cable
fully in tension, no slack) is at the 4th photo from the bottom here:
http://www.flysquirrel.net/piets/incident/incident.html
>Had considered raising the height of the bell crank in fuse but
>this could gear down the amount of travel avail for the elevtor.
It really isn't a problem and everything will work fine if you just build it
to the plans. That is, unless you're an engineer (like John Dilatush), a
perfectionist, a tinkerer, or just don't like for a classic 4-bar linkage to
operate with one of the linkages slack ;o)
What's funny is that it is so easy to say all this stuff now that I have an
airplane to fly. Back before I did, I'd worry and fret and fuss and think
and sketch and build cardboard and string and popsicle stick parts (all of
which are good things to do, mind you), but now when I read about somebody
fretting about things like this when they could have already completed the
part and gotten it covered, getting them that much closer to actually
flying, I want to say the same thing everybody told me back then: "just
hurry up and build it, because flying these airplanes is so much fun!"
Oscar Zuniga
San Antonio, TX
mailto: taildrags@hotmail.com
website at http://www.flysquirrel.net
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Message 2
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| Subject: | One or the Othet? |
Sheet metal Pieters,
These questions are addressed primarily to you. I am before building a new
cowling for my Aeronca. The right and left lower panels have compound curves,
not sharp, but about 1 1/2 feet by 1 ft. Would an English Wheel or a Pneumatic
Plainishing Hammer be the best tool? This is a new field and I would like
some help and advice.
Corky
************************************** See what's free at http://www.aol.com.
Message 3
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