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agibeaut
Joined: 21 Mar 2007
Posts: 64
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 Posted: Tue Sep 08, 2009 7:19 pm Post subject: Horizontal Stab Position |
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I'm afraid I've mounted the Horizontal Stab on my 701 too far forward, or possibly too high off the Fuselage. When I test mounted the elevator I found that it will only deflect about 18 degrees at a down angle due to interference with the bottom horn and the Fuselage top skin. A dimension from the top rear skin to the nose of the Horizontal Stab using a square on top of the Fuse would really help. Also, if it is too high, can anyone tell me what the distance should be between the Horizontal Stab bottom skin and the top of the Fuselage at its closest point? Mine is 18mm.
Thanks
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dwilde(at)clearwire.net
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| Posted: Tue Sep 08, 2009 7:51 pm Post subject: Horizontal Stab Position |
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agibeaut wrote:
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I'm afraid I've mounted the Horizontal Stab on my 701 too far forward, or possibly too high off the Fuselage. When I test mounted the elevator I found that it will only deflect about 18 degrees at a down angle due to interference with the bottom horn and the Fuselage top skin. A dimension from the top rear skin to the nose of the Horizontal Stab using a square on top of the Fuse would really help. Also, if it is too high, can anyone tell me what the distance should be between the Horizontal Stab bottom skin and the top of the Fuselage at its closest point? Mine is 18mm.
Thanks
If I understand you correctly, I think your height from the top of the
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fuselage to the bottom of the horizontal stabilizer is probably ok. I
just measured mine and it is 16 mm. I remember having a problem getting
the deflection angles right but I can't for the life of me remember what
I did. I would be real surprised if you would ever need more than the
18 degrees you currently have. I can get my plane up to 100 mph real
quick without much forward stick. Check with the folks at Zenith and
see if they feel 18 degrees is sufficient before you do anything drastic.
Dan Wilde
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n752ms(at)softcom.net
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| Posted: Wed Sep 09, 2009 4:23 am Post subject: Horizontal Stab Position |
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Agibeaut.
I had the same problem. I ran into lots of these little clearance problems
in other places also.
I just ground a little notch in the top fuse skin to clear the horn. It
doesn't take much to allow the elevator to move a lot more. I also use this
as my positive down stop for the elevator.
Dan is correct, you won't even come close to using all the available down
elevator. Now you will use all of the up elevator on almost every landing.
Mark S.
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bobkat
Joined: 07 Sep 2008
Posts: 143
Location: Bismarck, ND
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| Posted: Wed Sep 09, 2009 5:25 am Post subject: Horizontal Stab Position |
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I'd sure agree with Dan on this. The plane is so wonderfully pitch
sensitive that the stick hardly moves much, especially with the VG's
attatched.
Seems to me I opened a Pandora's box by monkeying with the bell crank and
for a while the elevator cable rubbed the inside of the stabilizer giving me
violent headaches and fits of frustrating madness! LOL There was a few
nasty words heard in my shop at the time......
I finally got it all worked out, but if you can, I'd try to do what Dan
said - nothing if possible!
---
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bobkat
Joined: 07 Sep 2008
Posts: 143
Location: Bismarck, ND
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| Posted: Wed Sep 09, 2009 5:43 am Post subject: Horizontal Stab Position |
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I can't recall right now and the plane is at the airport, but I had trouble
here and checked and double checked the measurments. The bell crank was
hitting something or other, and seems to me I had to build a slightly
larger/longer/higher bell crank, but can't recall the details. I remember
being frustrated and thought I had screwed up, but all my measurments were
OK. That was long before I discoverd the group on Matronics! Wish I had
known about all you guys back then.....Found Matronics after it was
flying -dang it...
---
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agibeaut
Joined: 21 Mar 2007
Posts: 64
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| Posted: Wed Sep 09, 2009 7:17 am Post subject: Horizontal Stab Position |
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Once again, the Matronics List guys come through. I was about to do a bonehead thing and start modifying the elevator horn, but you guys advised against it based on experience. You are right.
I talked to Roger at ZAC and it is normal to have to trim the "L" angle at the top rear Fuselage to allow enough movement to get the down angle correct. I'm going to work to the minimum down angle also.
Thanks guys for your quick responses. I was in a really bad place there for a day or two, and some of the same bad words that BokKat found in his shop turned up in mine. They must come with the kit.
--- On Wed, 9/9/09, BokKat <bobkat(at)btinet.net> wrote:
[quote] From: BokKat <bobkat(at)btinet.net>
Subject: Re: Horizontal Stab Position
To: zenith701801-list(at)matronics.com
Date: Wednesday, September 9, 2009, 8:19 AM
--> Zenith701801-List message
posted by: "BokKat" <bobkat(at)btinet.net>
I'd sure agree with Dan on this. The plane is so
wonderfully pitch sensitive that the stick hardly moves
much, especially with the VG's attatched.
Seems to me I opened a Pandora's box by monkeying with the
bell crank and for a while the elevator cable rubbed the
inside of the stabilizer giving me violent headaches and
fits of frustrating madness!
LOL There was a few nasty words heard in my
shop at the time......
I finally got it all worked out, but if you can, I'd try to
do what Dan said - nothing if possible!
---
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