Zenith Aircraft Builders and Flyers
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Hoerner tip
Has any plans builder tried the Hoerner wing tip for flaperon or slat to match the wing? I glued those unused form blocks and shaped up a mold, may be for a papermache' with fiberglass resin, to see how it looks.
Champ
Replies to This Discussion
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Permalink Reply by John Austin on
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possibly ditto for the HZ stab, but certainly don't know...
Hmmm .... I've always wondered what a ? 6"- 9" fiberglass tip extension of the elevator might do as far as low speed effectiveness to help hold the nose up during landing? The slats, wings, and flaperons seem quite effective as-is on the STOL 750 - seems the elevator, though could benefit from a little more oomph!
What I would envision is a tip with the same profile as the elevator that when mounted, leaves a narrow slit in the leading edge so it could clear the elevator mounting bracket on each end. Guess it would look a little "funny" since the leading edge would be stepped-back from the leading edge of the HT, but if it worked, who cares? ;>)
John
N750A
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Permalink Reply by Chumphol Sirinavin on
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John,
The CH701 N12369 of the blog post 'Flying from the Florida Coast to Haiti' has big end plates at the tips of the horizontal stabilizer. They are to extend the effective span and may help a bit with directional stability, I guess. To extend the elevator? Hmmm...
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The elevator spar needs to be extended so that you can place 2 elevator nose ribs straddling the mounting bracket, with some access to install and inspect the hinge nut.
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Seems to me that if the tip is not extended too far (? 6" - 9"?) and have a secure mount to the present end rib behind the pivot, a sufficiently stiff fiberglass tip shouldn't need much internal structure. I was thinking one rib to close-off the tip where it would pass alongside the end of the HT. I've seen some pretty long tips on wings that were hollow - fiberglass shell only! Of course, the longer you make the tips, it will induce twisting forces on the elevator - so it would be wise to keep them short! Wonder if a couple of 6" tips, adding a foot of span to the elevator, would make a significant difference in elevator authority?
As far as installation and access to the pivot, one could rivet the rear half of a rib, with the flange turned outboard, behind the hinge and put nutplates in the flange with countersunk screws securing the tip. Take out a few screws, the tip comes off, and you have access to the outboard elevator pivots.
John
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Sounds quite alright to me. Well thought out.
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๋John,
The balance horns on rudder and HZ tips of this Pilatus Porter are close to what you want to make. Note the end plate at the HZ tip.
May I add that the Porter also has its HZ inverted airfoil shape, but much milder when compare to CH701's. The third picture shows the HZ skeleton of a Savannah S using bullet airfoil. The Savannah was originally the CH701 twin now turn sibling in the Savannah S.
Champ
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That Porter's tail is really clever - it extends the elevator with the tips and incorporates an end plate that not only will increase the HT's effectiveness, but also serve as an end plate to the elevator tip which would be especially helpful when the leading edge of the tip is not aligned with the HT!
John
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I had some co-pilot time in a Porter. Reading your first comment here I was seeing the Porter tail in my mind's eye.
To make the elevator pivot an item on pre-flight inspection, I would have the tip a slot cutout, although a clear plastic front part migh do for some. The HT end plates will go very well with my long wing CH701.
Set up a new topic on this issue and I will follow you there.
Champ
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Many well proficient pilots claim they never ever have inadequate pitch control on flare. Many others report ways of getting drag reduced for better control on flare, namely: 1. Put fairing over wing struts; 2. Put fairing over the gap under the elevator; 3. Curve up the flat roof. Do the Beanie mod.; 4. Install micro vortex generators to the elevator lower leading edge. Extending the elevator will be the latest addition.
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Permalink Reply by Normand Lambert on
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HI Champ,
Wondered the same thing... Easier to make but I wonder how different they would be from the normal end plates.
Fiberglass would also be the product to use to make those.
Thanks for sharing your toughts...
Regards,
Norm
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Hi Normand,
Beside the look, there should be some performance gain. Since we can not share the mold for the left and the right ones, I think I should make them Hoerner tips.
Best,
Champ
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