Zen 90 stab mistake  
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Zen 90 stab mistake - 11/5/2002 10:14:40 AM   
KenChoo


 

Posts: 139
Joined: 10/7/2002
From: OakleighVictoria, AUSTRALIA
Status: offline 		Hi all,

Okay, I made a very stupid mistake installing the horizontal stab on my Zen 90. In my obsession with making sure the alignment of stab tips to wing tips and stab tips to fuse center line (at the firewall) was equal, as well as ensuring the stab was 100% level with the wing, I forgot to ensure that both stab halves were equidistant from the fuse! I have my left stab half about 4mm further out than the right half (and therefore, the stab is tilted back on the left/longer half since all other measurements like stab tip to wing tip do match up).

My question now is, should I try to remove the stab and redo it right this time (I'm a horrible builder, I mess up ARFs!) or will this amount of error (4mm) not be enough to affect the flight performance so that it would be noticeable? I'm guessing that with more stab out on the left side it would produce more lift on the left, and would adversely impact performance/trimming whenever I moved out of level flight. Any feedback is greatly appreciated.

Cheers,
Ken

P.S. Any tips on how to remove the stab to refit it properly would be appreciated! Right now the only thing I can think of is to draw a line about 1/8th inc. above the stab at the fuse joint, and use my knife to cut out the stab and wood at the line. I would remove that 1/8th in wood and install a new saddle inside, and reattach with expoxy and filler.

< Message edited by KenChoo -- Nov 5 2002 5:23AM >
       Post #: 1

Zen 90 stab mistake - 11/5/2002 10:46:43 AM   
krayzc-RCU



Posts: 5972
Joined: 3/26/2002
From: Kannapolis, NC, USA
Status: offline 		my first arf i had the stab and fin cocked it flew well, but knife edge was different mixes on the radio. I would not attempt to tear off those parts unless you were planning to enter the TOC and you need all to be perfect. I think you may end up needing new parts if you try to remove those items.....

_____________________________

smooth as silk!

(in reply to KenChoo)
       Post #: 2

Zen 90 stab mistake - 11/5/2002 12:07:54 PM   
CHassan



Posts: 1230
Joined: 8/26/2002
From: Beavercreek, OH, USA
Status: offline 		If you are gonna remove it you mentioned the best way.
I wouldn't worry to much about it. Fly it a few times if it still bothers you. Cut it out. If not, happy flying.

_____________________________

The knack of flying is learning how to throw yourself at the ground and miss.
--Hitchhikers Guide to the Galaxy--

(in reply to KenChoo)
       Post #: 3

Zen 90 stab mistake - 11/5/2002 6:34:54 PM   
swill



Posts: 484
Joined: 12/30/2001
From: Decatur, GA, USA
Status: offline 		Suffering from the same phenomenon as you, the stab halves are not the same distance out on my pattern plane, a Dash 5. Wondering what to do, is it to late, etc?? I decided to fly it. It flies well and you probably won't notice any difference. I know you hate to do something on a plane you want to 'get right' like a pattern plane... I was worried, but now it's my best flying machine.

Fly it and see if you like it. Anything this small could be mixed out.

hope this helps,
Scott

(in reply to KenChoo)
       Post #: 4

Zen 90 stab mistake - 11/6/2002 5:03:58 AM   
PineBaron



Posts: 217
Joined: 2/20/2002
From: Marlton, NJ, USA
Status: offline 		It is not the stab offset thats going to make any difference but the elevators offset may make a difference, if any. 4mm is probably not enough to make a significant difference, I will not say how accurate I like to be(will probably make you sick), but as others will tell you, the plane flys extremely well, if you have abundant power.

(in reply to KenChoo)
       Post #: 5

Zen 90 stab mistake - 11/6/2002 5:17:38 AM   
KenChoo


 

Posts: 139
Joined: 10/7/2002
From: OakleighVictoria, AUSTRALIA
Status: offline 		Hello all,

Thanks for all the great advice. I think the consensus is that I should fly it first and only if I notice something I really can't live with shoudl I try to fix it. *Whew!* I took another look at it last night and I agree, I think it's even slightly less than 4 mm. I'll just be real careful with the elevator setup and take it from there. I think it'll be a good plane for me too... Thanks to all again.

Cheers,
Ken

(in reply to KenChoo)
       Post #: 6

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