I highly recommend against welding the WAFs. You will change the Temper of the 4130 steel. You need not worry about the strength of the WAFs, they will outlast the spars. In strength and time. The connection between the sets are shear load. (Not friction). If you will insert a cotter pin through the retaining nut or safety wire, you can set and forget.
Adam Tippin A&P KR2S builder > On Jan 25, 2016, at 2:12 PM, Frank Hamelly via KRnet <krnet at > list.krnet.org> wrote: > > Chris, I was lying in bed last night wondering about the integrity of the > WAFs myself. Those four little bolts are all there is between flying and a > wing ripping off, especially under heavy G. Has anyone ever welded the > inner and outer WAF fittings after assembly 'just in case' or would that > impose unwanted stresses on them? > > Frank > >> On Mon, Jan 25, 2016 at 12:00 PM, <krnet-request at list.krnet.org> wrote: >> >> Send KRnet mailing list submissions to >> krnet at list.krnet.org >> >> To subscribe or unsubscribe via the World Wide Web, visit >> http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org >> or, via email, send a message with subject or body 'help' to >> krnet-request at list.krnet.org >> >> You can reach the person managing the list at >> krnet-owner at list.krnet.org >> >> When replying, please edit your Subject line so it is more specific >> than "Re: Contents of KRnet digest..." >> >> >> Today's Topics: >> >> 1. Wing Attach Fitting questions (Dave Acklam) >> 2. VW engines (Oscar Zuniga) >> 3. Re: Wing Attach Fitting questions (Chris Kinnaman) >> 4. Re: clean workshop (Paul) >> 5. Re: Manifold vacuum (S) >> 6. Re: Manifold vacuum (Gary Hinkle) >> 7. Re: Manifold vacuum (Jeff Scott) >> 8. Re: Manifold vacuum (Nerobro) >> 9. Re: Manifold vacuum (Dave Acklam) >> 10. Re: Manifold vacuum (Randall Smith) >> 11. Re: Manifold vacuum (david) >> >> >> ---------------------------------------------------------------------- >> >> Message: 1 >> Date: Sun, 24 Jan 2016 10:35:43 -0800 >> From: Dave Acklam <dave.a.krnet at gmail.com> >> To: KRnet <krnet at list.krnet.org> >> Subject: KR> Wing Attach Fitting questions >> Message-ID: >> < >> CAAeYjfhsT9eKvgaXChTheActKHPncM29UmT2Raq7xwWGxo14AQ at mail.gmail.com> >> Content-Type: text/plain; charset=UTF-8 >> >> Ok... >> >> Since some folks here have a much better understanding of the 'design' >> behind the WAFs than I do... >> >> I'm not an engineer, and I don't want to die... So further experience would >> probably help >> >> Some questions: >> >> 1) What is the key force or mechanisim providing strength to the WAF joint? >> Is it the clamping pressure imparted by the bolts? The shaft of the bolt >> itself? >> >> 2) Is there a preferred method to 'adjust' a set of wing fittings that >> were drilled wrong? Would welding up the hole & re-drilling work? Bushings? >> Just make a new set? >> >> Any other info would be useful. >> >> I'm trying to mate wings from another KR, that I bought, to mine... >> >> >> ------------------------------ >> >> Message: 2 >> Date: Sun, 24 Jan 2016 11:08:12 -0800 >> From: Oscar Zuniga <taildrags at hotmail.com> >> To: "krnet at list.krnet.org" <krnet at list.krnet.org> >> Subject: KR> VW engines >> Message-ID: <COL127-W398830268BBB6005E4BE71BCC60 at phx.gbl> >> Content-Type: text/plain; charset="iso-8859-1" >> >> I've been looking for pictures and a writeup on a beautiful KR with a Type >> 4 that was built by a Florida medical guy. As I recall, it won some awards >> at Sun 'n' Fun and may have won a 'Best Engine' at a KR Gathering. I >> believe the builder sold it and he may have died since then too, but I may >> also be getting my stories mixed up. Anyway, studying pictures of that >> firewall forward would be informative. >> Oscar ZunigaMedford, OR >> >> >> ------------------------------ >> >> Message: 3 >> Date: Sun, 24 Jan 2016 12:49:08 -0700 >> From: Chris Kinnaman <gliders at spinn.net> >> To: KRnet <krnet at list.krnet.org> >> Subject: Re: KR> Wing Attach Fitting questions >> Message-ID: <56A52AB4.5070809 at spinn.net> >> Content-Type: text/plain; charset=ISO-8859-1; format=flowed >> >> If you have mismatched hole locations between the WAFs and the spar, >> first determine if the wing fittings were actually drilled wrong. If the >> hole diameters are within limits and fit the bolts without play, setback >> of hole from the edge of the WAF is adequate, and they match one spar, >> either the center section or the outer panels, you could glue >> tight-fitting dowels into the unmatched spar's fitting holes and >> carefully re-drill new fitting holes which match the WAF hole locations. >> Clamping pressure is not considered when engineering this type of bolted >> joint, it's the shaft of the bolt in shear in this case which bears the >> loads. >> >> Chris >> >>> On 1/24/2016 11:35 AM, Dave Acklam via KRnet wrote: >>> Ok... >>> >>> Since some folks here have a much better understanding of the 'design' >>> behind the WAFs than I do... >>> >>> I'm not an engineer, and I don't want to die... So further experience >> would >>> probably help >>> >>> Some questions: >>> >>> 1) What is the key force or mechanisim providing strength to the WAF >> joint? >>> Is it the clamping pressure imparted by the bolts? The shaft of the bolt >>> itself? >>> >>> 2) Is there a preferred method to 'adjust' a set of wing fittings that >>> were drilled wrong? Would welding up the hole & re-drilling work? >> Bushings? >>> Just make a new set? >>> >>> Any other info would be useful. >>> >>> I'm trying to mate wings from another KR, that I bought, to mine... >>> _______________________________________________ >>> Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. >>> To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org >>> please see other KRnet info at http://www.krnet.org/info.html >>> see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to >> change options >> >> >> >> >> ------------------------------ >> >> Message: 4 >> Date: Mon, 25 Jan 2016 12:23:27 +0000 (UTC) >> From: Paul <airguynh at comcast.net> >> To: KR2List <krnet at list.krnet.org> >> Subject: Re: KR> clean workshop >> Message-ID: >> <608914046.11851719.1453724607467.JavaMail.zimbra at comcast.net> >> Content-Type: text/plain; charset=utf-8 >> >> In my shop it means I can't find anything... >> >> ----- Original Message ----- >> >> From: "Flesner via KRnet" <krnet at list.krnet.org> >> To: "KRnet" <krnet at list.krnet.org> >> Cc: "Flesner" <flesner at frontier.com> >> Sent: Saturday, January 23, 2016 10:50:51 AM >> Subject: KR> clean workshop >> >> >> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ >> >> One of my "observations of life" is " a clean flat surface in a >> workshop will stay clean as long as lt stays in motion". ?Put ?that >> work bench on wheels and keep it moving. :-) >> >> Larry Flesner >> >> >> _______________________________________________ >> Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. >> To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org >> please see other KRnet info at http://www.krnet.org/info.html >> see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change >> options >> >> >> >> ------------------------------ >> >> Message: 5 >> Date: Mon, 25 Jan 2016 07:34:26 -0500 >> From: S <s_sbal at hotmail.com> >> To: KRnet <krnet at list.krnet.org> >> Subject: Re: KR> Manifold vacuum >> Message-ID: <DUB109-W241B12E9C8E5B85B052D14FFC70 at phx.gbl> >> Content-Type: text/plain; charset="iso-8859-1" >> >>> >>> It was a very long time ago. The engine was a Type 1 VW, and the carb >> was >>> probably a POSA. If there was any mixture control, it had to be manual. >> Thank you Dan ! >> I got a full set of vaccum instruments from a very friendly aircraft >> mechanic and I am exploring the best way to supply them, preferably without >> the use of draggy and icing-prone external venturi. >> I may try to use some sort of combined manifold vacuum/exhaust venturi to >> create enough vacuum in all flight conditions. >> >> Stefan >> s_sbal "at" hotmail.com >> >> >> ------------------------------ >> >> Message: 6 >> Date: Mon, 25 Jan 2016 10:22:50 -0500 >> From: Gary Hinkle <Gary19521 at verizon.net> >> To: KRnet <krnet at list.krnet.org> >> Subject: Re: KR> Manifold vacuum >> Message-ID: <hwweudr1788ebf3mewtedj13.1453735370589 at email.android.com> >> Content-Type: text/plain; charset=utf-8 >> >> >> >> Since I use a distributor instead of a mag, I installed a vacuum pump were >> the mag mounts. Made a drive that bolted on. Has worked for over 500hrs >> with no issues. >> >> >> Sent from my Verizon Wireless 4G LTE smartphone >> >> -------- Original message -------- >> From: S via KRnet <krnet at list.krnet.org> >> Date: 01/25/2016 07:34 (GMT-05:00) >> To: KRnet <krnet at list.krnet.org> >> Cc: S <s_sbal at hotmail.com> >> Subject: Re: KR> Manifold vacuum >> >>> >>> It was a very long time ago.? The engine was a Type 1 VW, and the carb >> was >>> probably a POSA.? If there was any mixture control, it had to be manual. >> Thank you Dan ! >> I got a full set of vaccum instruments from a very friendly aircraft >> mechanic and I am exploring the best way to supply them, preferably without >> the use of draggy and icing-prone external venturi. >> I may try to use some sort of combined manifold vacuum/exhaust venturi to >> create enough vacuum in all flight conditions. >> >> Stefan >> s_sbal "at" hotmail.com?? >> ?? ? >> _______________________________________________ >> Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. >> To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org >> please see other KRnet info at http://www.krnet.org/info.html >> see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change >> options >> >> ------------------------------ >> >> Message: 7 >> Date: Mon, 25 Jan 2016 16:55:34 +0100 >> From: "Jeff Scott" <jscott.planes at gmx.com> >> To: krnet at list.krnet.org >> Subject: Re: KR> Manifold vacuum >> Message-ID: >> >> <trinity-e668fe3d-ceac-4498-9f2b-193a4cd4eb39-1453737334492 at >> 3capp-mailcom-bs12 >> >> Content-Type: text/plain; charset="UTF-8" >> >> >> >> ------------------------------ >> >> Message: 8 >> Date: Mon, 25 Jan 2016 10:16:52 -0600 >> From: Nerobro <nerobro at gmail.com> >> To: KRnet <krnet at list.krnet.org> >> Subject: Re: KR> Manifold vacuum >> Message-ID: >> <CABLCE0h5MMTczpCGFopHGFgC-CbpE3TiDXRfQRqABf1gc= >> d3_Q at mail.gmail.com> >> Content-Type: text/plain; charset=UTF-8 >> >> <--- not a pilot... Yet... >> >> Manifold vacuum isn't something I'd depend on. As engine load goes up, >> manifold vacuum goes down. I'd worry about instruments getting good vacuum >> on climbout. If the engine cuts out, your manifold vacuum will drop as >> well (even if the prop windmills). Using exhaust to produce vacuum is >> interesting too, I bet it would work, but I doubt you'd get good vacuum >> with the engine windmilling. >> >> I suppose i'm making the argument for a vacuum horn, or an engine driven >> vacuum pump, and am assuming the engine will windmill. >> >> On Mon, Jan 25, 2016 at 9:55 AM, Jeff Scott via KRnet < >> krnet at list.krnet.org> >> wrote: >> >>> >>> _______________________________________________ >>> Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. >>> To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org >>> please see other KRnet info at http://www.krnet.org/info.html >>> see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to >> change >>> options >> >> >> ------------------------------ >> >> Message: 9 >> Date: Mon, 25 Jan 2016 08:41:53 -0800 >> From: Dave Acklam <dave.a.krnet at gmail.com> >> To: KRnet <krnet at list.krnet.org> >> Subject: Re: KR> Manifold vacuum >> Message-ID: >> < >> CAAeYjfgBVgOeMVoOHuh5kiZTqpsLRrUZrKugaKXwTCvAsKMXQg at mail.gmail.com> >> Content-Type: text/plain; charset=UTF-8 >> >> Use 12v vac pump?? >> >> Manifold pressure isn't a constant enough source.... >> On Jan 25, 2016 4:35 AM, "S via KRnet" <krnet at list.krnet.org> wrote: >> >>>> >>>> It was a very long time ago. The engine was a Type 1 VW, and the carb >>> was >>>> probably a POSA. If there was any mixture control, it had to be >> manual. >>> Thank you Dan ! >>> I got a full set of vaccum instruments from a very friendly aircraft >>> mechanic and I am exploring the best way to supply them, preferably >> without >>> the use of draggy and icing-prone external venturi. >>> I may try to use some sort of combined manifold vacuum/exhaust venturi to >>> create enough vacuum in all flight conditions. >>> >>> Stefan >>> s_sbal "at" hotmail.com >>> >>> _______________________________________________ >>> Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. >>> To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org >>> please see other KRnet info at http://www.krnet.org/info.html >>> see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to >> change >>> options >> >> >> ------------------------------ >> >> Message: 10 >> Date: Mon, 25 Jan 2016 10:50:05 -0600 >> From: Randall Smith <crz372 at yahoo.com> >> To: KRnet <krnet at list.krnet.org> >> Subject: Re: KR> Manifold vacuum >> Message-ID: <211CAAAA-2968-4660-A06C-366FBFFA843A at yahoo.com> >> Content-Type: text/plain; charset=us-ascii >> >> My Bellanca super Viking had one instrument to the intake manifold in for >> emergency only. Full throttle I had almost no vacuum. Only drove my turn >> and bank. Not enough constant vacuum on your intake. Most airplanes with a >> full set of instruments requires 5 inches minimum. >> >> Sent from my iPhone >> >>>> On Jan 25, 2016, at 10:41 AM, Dave Acklam via KRnet < >>> krnet at list.krnet.org> wrote: >>> >>> Use 12v vac pump?? >>> >>> Manifold pressure isn't a constant enough source.... >>> On Jan 25, 2016 4:35 AM, "S via KRnet" <krnet at list.krnet.org> wrote: >>> >>>>> >>>>> It was a very long time ago. The engine was a Type 1 VW, and the carb >>>> was >>>>> probably a POSA. If there was any mixture control, it had to be >> manual. >>>> Thank you Dan ! >>>> I got a full set of vaccum instruments from a very friendly aircraft >>>> mechanic and I am exploring the best way to supply them, preferably >> without >>>> the use of draggy and icing-prone external venturi. >>>> I may try to use some sort of combined manifold vacuum/exhaust venturi >> to >>>> create enough vacuum in all flight conditions. >>>> >>>> Stefan >>>> s_sbal "at" hotmail.com >>>> >>>> _______________________________________________ >>>> Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. >>>> To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org >>>> please see other KRnet info at http://www.krnet.org/info.html >>>> see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to >> change >>>> options >>> _______________________________________________ >>> Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. >>> To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org >>> please see other KRnet info at http://www.krnet.org/info.html >>> see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to >> change options >> >> >> >> ------------------------------ >> >> Message: 11 >> Date: Mon, 25 Jan 2016 10:53:13 -0600 >> From: david <ainut at knology.net> >> To: KRnet <krnet at list.krnet.org> >> Subject: Re: KR> Manifold vacuum >> Message-ID: <56A652F9.6030501 at knology.net> >> Content-Type: text/plain; charset=windows-1252 >> >> The electric vacuum pumps (for the brakes) from the mid-90's 'Vettes are >> about the best out there. I put one on my Mustang II. Very durable. >> Not too expensive. >> >> David M. >> >> >> >> >>> On 01/25/2016 10:41 AM, Dave Acklam via KRnet wrote: >>> Use 12v vac pump?? >>> >>> Manifold pressure isn't a constant enough source.... >>> On Jan 25, 2016 4:35 AM, "S via KRnet" <krnet at list.krnet.org> wrote: >>> >>>>> It was a very long time ago. The engine was a Type 1 VW, and the carb >>>> was >>>>> probably a POSA. If there was any mixture control, it had to be >> manual. >>>> Thank you Dan ! >>>> I got a full set of vaccum instruments from a very friendly aircraft >>>> mechanic and I am exploring the best way to supply them, preferably >> without >>>> the use of draggy and icing-prone external venturi. >>>> I may try to use some sort of combined manifold vacuum/exhaust venturi >> to >>>> create enough vacuum in all flight conditions. >>>> >>>> Stefan >>>> s_sbal "at" hotmail.com >>>> >>>> _______________________________________________ >>>> Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. >>>> To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org >>>> please see other KRnet info at http://www.krnet.org/info.html >>>> see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to >> change >>>> options >>> _______________________________________________ >>> Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. >>> To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org >>> please see other KRnet info at http://www.krnet.org/info.html >>> see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to >> change options >> >> >> >> >> ------------------------------ >> >> Subject: Digest Footer >> >> _______________________________________________ >> See KRnet list details at http://www.krnet.org/instructions.html >> KRnet mailing list >> KRnet at list.krnet.org >> http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org >> >> >> ------------------------------ >> >> End of KRnet Digest, Vol 4, Issue 24 >> ************************************ > _______________________________________________ > Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. > To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org > please see other KRnet info at http://www.krnet.org/info.html > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options
