KIS-List Digest Archive

Wed 08/18/10


Total Messages Posted: 2



Today's Message Index:
----------------------
 
     1. 04:40 AM - Elevator Trailing Edge ()
     2. 07:35 AM - Fw: Elevator Trailing Edge ()
 
 
 


Message 1


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    Time: 04:40:05 AM PST US
    From: <bakerocb@cox.net>
    Subject: Elevator Trailing Edge
    8/18/2010 Hello Graham, Thanks for your follow up regarding the KIS TR-1 stepped elevator trailing edge skin surface copied below. You wrote: 1) "..Yep think i have goofed up..." Now I don't think so. I took another look at the drawing of the elevator trim tab cross section on page 14 (Rev 15) of the KIS TR-1 Builders Manual and it shows very clearly a molded step in the bottom surface of the trailing edge of the elevator skin. See the attached Hs14a.bmp file (courtesy of Hans- Christian Erstad.) 2) "but am sure u are rite that the elevator trailing edge is different than the other control surface trailing edges" I won't talk to the other control surfaces, but the drawing referenced above shows that you were right in using the term "stepped" as it applied to the bottom surface of the trailing edge of the elevator skin. I think that what happened in my case (and maybe some others as well -- Jesse?) is that our method of extending the trailing edge of the elevator just obliterated that molded step and I forgot that it ever existed. My bad. 3) ".. Sorry for my confusion ...!" Not at all, turns out that I was the one confused about no molded step in the skin in the original configuration. 'OC' Baker Says: "The best investment we can make is the time and effort to gather and understand knowledge." ======================================================= ----- Original Message ----- From: "Graham Brighton" <gbrighton@skymesh.com.au> Sent: Tuesday, August 17, 2010 6:10 PM Subject: Re: KIS-List: Elevator Trailing Edge > <gbrighton@skymesh.com.au> > > Hi Back OC ... Yep think i have goofed up .... The Ailerons and Flaps have > a 'Stepped' trailing edge ..that obviously works fine ... But i have long > wondered how the airflow characteristics work there ... (as compared with > a more common knife edge trailing edge ... ) But due being too busy with > too much 'other stuff ' and only having a very small brain .. i mistakenly > transposed my aileron/flap puzzlement onto the Elevator trailing edge > question . > Will be at the Hanger tomorrow and will double check ...but am sure u are > rite that the elevator trailing edge is different than the other control > surface trailing edges .. Sorry for my confusion ...! > > Graham > ================================================================ > > ----- Original Message ----- > From: <bakerocb@cox.net> > To: <kis-list@matronics.com>; <gbrighton@skymesh.com.au> > Sent: Wednesday, August 18, 2010 6:57 AM > Subject: KIS-List: Elevator Trailing Edge > > >> >> 8/17/2010 >> >> Hello Graham, You wrote: "...changing the elevator trailing edge from the >> original stepped shape to a knife edge......" >> >> I don't understand your words "..from the original stepped shape.." for >> the elevator trailing edge. >> >> My reading of the construction manual has the trailing edges of the top >> and bottom elevator fiberglass skin moldings being glued directly to each >> other as they meet. The result, looking at it from a side view, is a flat >> sided # isosceles triangle with the trailing edge being the thickness of >> the two fiberglass skins plus any adhesive ("a good coat of resin" in the >> words of the manual) holding those edges together.* >> >> Where does the "stepped shape" term arise from? Thanks. >> >> 'OC' Baker Says: "The best investment we can make is the time and effort >> to gather and understand knowledge." >> >> #PS: Flat sided being very important since I discovered (in my effort to >> extend the trailing edge of the elevator) that any other shape (concave >> in my original case) could result in a significant trimming effect on the >> elevator. >> >> *PS: Hence my warning against sanding the trailing edge too far forward >> lest one sand away the area being held together by the resin.


    Message 2


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    Time: 07:35:58 AM PST US
    From: <bakerocb@cox.net>
    Subject: Fw: Elevator Trailing Edge
    8/18/2010 Hello Graham, Thanks for your most gracious response and the pictures. I'd like to ask some questions / make some comments regarding the pictures: 1) In the bottom center of picture _57 there is a silver colored metal can with a cable like projection coming out to the right and entering the console. What is the purpose of this can? 2) On the round rotating control cross bar in this same picture there is a short welded on bar stick out to the aft that appears to hit an angled piece of metal fastened to the center console for the purpose of a nose up control stick movement pitch stop. Was this short welded on bar part of the original kit provided piece and intended for the purpose described above? What provides the stop for the nose down control stick movement? This short welded on bar, as well as the welded on mounting tab for the aileron stop bolt, did not appear on the follow on square version of the rotating cross bar in my kit #116. 'OC' Baker Says: "The best investment we can make is the time and effort to gather and understand knowledge." PS: Beautiful workmanship and paint job shown in picture _874. ================================================= ----- Original Message ----- From: "Graham Brighton" <gbrighton@skymesh.com.au> Sent: Wednesday, August 18, 2010 8:17 AM Subject: Re: Elevator Trailing Edge > G'Day back OC, > No worries ...Have attached my elevator ...and a > pic of my control stick stops ... Still wonder about how the airflow > behaves on passing over our 'stepped' trailing edges as i haven't seen our > 'stepped' set up before ... seems to work fine ..so don't a real reason to > worry or anything ... its just that it seems a little er ..unusual ... > > Cheers > > Graham




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