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alan_hunter1664
Joined: 05 Oct 2013
Posts: 36
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 Posted: Thu Apr 23, 2015 1:20 pm Post subject: NG Tailplanes & Anti-Servo Trim Tabs |
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I seem to be stumbling from one problem to another at the minute. Maybe it's my inexperience!
Whilst waiting for an answer on my Tailplane Torque tube issue I though I would complete the quick build Tailplanes. This is achieved by bonding the bottom skin and the tip using araldite 420 and was completed with only minor problems along the way. However, fitting the Anti-servo trim tabs is another matter. I've not approached Europa with this yet as I wanted to see if anyone else had overcome the problem, if it is a problem. The anti-servo tab now comes pre-built but this is not reflected in the build manual. The problem is that if I align the trailing edge of the trim tab with that of the tailplane there is insufficient trailing edge at the tailplane root to attach the trim tab to and there would be restricted movement of the trim tab. there are 'trim lines' on the tailplane training edge and trim tab upper leading edge however trimming them to these lines would make the anti-servo tab extend proud of the tailplane trailing edge, is this normal? I've attached some photos which I hope highlight the issue. Any ideas?
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| If the 'trim lines are used as the hinge line the trailing edges are offset. |
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1.15 MB |
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4709 Time(s) |
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| Red line on trim tab shows where the cut would need to be made but this would lead to interference with the bottom leading edge. |
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1.06 MB |
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4709 Time(s) |
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| red line shows where the leading edge would sit to align the training edges |
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1.31 MB |
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JonathanMilbank
Joined: 14 Apr 2012
Posts: 391
Location: Aberdeen area
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| Posted: Fri Apr 24, 2015 1:43 am Post subject: Re: NG Tailplanes & Anti-Servo Trim Tabs |
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Even though your photographs clearly show the trim lines, if I were in your shoes I would find a Europa which is already built and take some very careful measurements and photographs for comparison before cutting anything.
When I built my Classic wings there were reference pen marks made by the factory on the foam to help set an incidence (I think) angle accurately. This was 20 years ago, so I'm a little vague. However one essential pen mark was missing and I needed advice to recreate that mark. Difficult when the factory template wasn't available.
As the old build notes stated "Think thrice, measure twice, cut once".
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Kelvin Weston
Joined: 14 Apr 2010
Posts: 90
Location: Hampshire, UK
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| Posted: Fri Apr 24, 2015 9:39 am Post subject: Re: NG Tailplanes & Anti-Servo Trim Tabs |
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Hi Alan
I’m not building the NG version but I will try and help with a few observations.
First, take a look in the NG build manual for the Anti Servo Trim Tab, figure 7. You can see that the hinge is on the upper surface of both tailplane and tab and also that the upper leading edge of the tab flange is only as wide as one half of the hinge. In your photo it looks much wider than this and may need to be trimmed. This will bring the tab closer to the rear closeout of the tailplane.
Second, take a look at the XS build manual, Chap 4, figure 12. This shows the whole assembly upside down but shows that the bottom flange of the tailplane closeout is trimmed back to allow the 30mm required movement.
I would avoid trimming the upper flange of the tailplane closeout ( the one the hinge fits on) unless absolutely necessary – this flange comes assembled on the NG tailplane and may have already been trimmed by the factory to the right depth.
The important dimension to achieve is the clearance between the leading edge nose of the tab and the tailplane closeout vertical web as shown in figure 12. If you have a slight clearance when the tab has moved the 30mm you should be ok.
I think this might take a slowly, slowly, little bit at a time approach to get right. You could make a cardboard template of the root and tip end of the tab and try them against the tailplane to see if you can get the required dimensions if you trim the tab flange to the width of the hinge (or just over).
As stated in the previous posting, I would measure 10 times and be absolutely sure before trimming.
I will have a look at my tailplane and tab. It is foam of course but some dimensions and photos might give you some ideas.
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_________________
Regards
Kelv Weston
Kit 497
kelv@kdweston.co.uk |
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Kelvin Weston
Joined: 14 Apr 2010
Posts: 90
Location: Hampshire, UK
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| Posted: Fri Apr 24, 2015 10:52 am Post subject: Re: NG Tailplanes & Anti-Servo Trim Tabs |
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Hi Alan
Here is a photo of one of my tailplane / tab hinges.
The flange each hinge half attaches to is approx 20mm wide, just over the hinge width.
With the trailing edge of the tailplane and trim tab aligned, the gap between the leading edge nose of the tab and the vertical web of the tailplane closeout is approx 10mm. Remember the movement here will be much smaller than the 30mm measured at the trailing edge.
The bottom flange of the tailplane is progressively trimmed back to just clear the tab at full movement. I think Bud has given some suggestions before on control gaps. You have no filling to do so you can keep them a bit tighter.
Hope this helps.
| | - The Matronics Europa-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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| Description: |
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| Filesize: |
47.26 KB |
| Viewed: |
4654 Time(s) |
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_________________
Regards
Kelv Weston
Kit 497
kelv@kdweston.co.uk |
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