From: krnet-bounces@mylist.net on behalf of krnet-request@mylist.net Sent: Thursday, September 25, 2003 12:00 PM To: krnet@mylist.net Subject: KRnet Digest, Vol 169, Issue 2 Send KRnet mailing list submissions to krnet@mylist.net To subscribe or unsubscribe via the World Wide Web, visit http://mylist.net/listinfo/krnet or, via email, send a message with subject or body 'help' to krnet-request@mylist.net You can reach the person managing the list at krnet-owner@mylist.net When replying, please edit your Subject line so it is more specific than "Re: Contents of KRnet digest..." Today's Topics: 1. Re: Spars (Stephen J Robinson) 2. Re: Spars (Mark Langford) 3. Re: Airfoil ribs (Joseph H. Horton) 4. Re: Airfoil ribs (Mark Langford) ---------------------------------------------------------------------- Date: Wed, 24 Sep 2003 13:47:25 -0400 From: Stephen J Robinson To: krnet@mylist.net Subject: Re: KR>Spars Message-ID: <20030925.095039.-147309.0.sjrobinson2@juno.com> Content-Type: text/plain; charset=us-ascii MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Precedence: list Message: 1 Gavin, I basically built my center wing stub with the dihedral starting at the center line inside the fuselage. Both for front and rear spars. Did this by calculating correct dihedral to get to wing tips, assuming the outer wings would just be an extension of the dihedral. Construction of center wing stubs was accomplished on the bench, by using 1/4" laminations, glued together and clamped while glue cured. Built them up the same dimensions called for in the plans, both top and bottom of the spars. Then once the spacers in between had been installed, drilled holes for allowing air pressure to be equalized along the center wing stub, before applying a finish coat to protect the interior. Then covered the front and back of the spars with the required plywood. Should be strong, still light in weight and the outer wings can be mounted on the WAFs without worrying about that break in the center stub versus the outer wings. Of course you still have to deal with the horizontal angle change called for on the rear wing stubs versus the outer wing panels. Hope this helps you think through how you might proceed. Steve Robinson On Sun, 14 Sep 2003 19:01:47 +1000 Gavin Donohoe writes: > I've been reading on Marks site about the new airfoils and have > decided to go with the 5048/6 option !! I also like the idea of > starting the wing dihedral inboard of the first rib. Has anybody > done this yet and how was it done ?? I have lots of timber but not > the right thickness, Is it stronger to laminate the spar centre > sections from maybe 1" planks and bend them on the bench before the > glue is set ??Maybe 1" is too thick to laminate maybe I need thinner > pieces but more of them?? Can someone with experience help to answer > some of these questions?? I want my spar to be as strong as I can > get it!! > > > Gav > > > --- > Outgoing mail is certified Virus Free. > Checked by AVG anti-virus system (http://www.grisoft.com). > Version: 6.0.518 / Virus Database: 316 - Release Date: 11/09/2003 > _______________________________________________ > see KRnet list details at http://www.krnet.org/instructions.html > > ------------------------------ Date: Thu, 25 Sep 2003 10:07:06 -0500 From: "Mark Langford" To: "KR builders and pilots" Subject: Re: KR>Spars Message-ID: <041f01c38376$afe92e60$5e0ca58c@tbe.com> References: <20030925.095039.-147309.0.sjrobinson2@juno.com> Content-Type: text/plain; charset="iso-8859-1" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Precedence: list Message: 2 Gavin wrote: > Is it stronger to laminate the spar centre > sections from maybe 1" planks and bend them on the bench before the > glue is set ??Maybe 1" is too thick to laminate maybe I need thinner > pieces but more of them?? Can someone with experience help to answer > some of these questions?? I think I'd laminate them out of 1/2" thick stock or thinner, and yes, glue it all up in a jig on a table, using lots of clamps. Make sure they don't slide apart width-wise too. Mark Langford, Huntsville, AL N56ML at hiwaay.net see KR2S project N56ML at http://home.hiwaay.net/~langford ------------------------------ Date: Thu, 25 Sep 2003 13:16:13 -0400 From: "Joseph H. Horton" To: krnet@mylist.net Subject: Re: KR>Airfoil ribs Message-ID: <20030925.131614.192.0.joe.kr2s.builder@juno.com> Content-Type: text/plain; charset=us-ascii MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Precedence: list Message: 3 Mark Langford, I had not looked at the sheet with the horizontal stab. templet in a long time. When I looked at it last night I saw there was another rib that appears to be at the tip that the horner tip could be shaped from . Is this correct? If it is that is what I'm going to make( and be removable) to get flying for next year Joe Horton joe.kr2s.builder@juno.com ------------------------------ Date: Thu, 25 Sep 2003 13:54:24 -0500 From: "Mark Langford" To: "KR builders and pilots" Subject: Re: KR>Airfoil ribs Message-ID: <001901c38396$70586480$5e0ca58c@tbe.com> References: <20030925.131614.192.0.joe.kr2s.builder@juno.com> Content-Type: text/plain; charset="iso-8859-1" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Precedence: list Message: 4 Joe Horton wrote: > I had not looked at the sheet with the horizontal stab. > templet in a long time. When I looked at it last night I saw there was > another rib that appears to be at the tip that the horner tip could be > shaped from . Is this correct? Yep, it's there to help form the tip, if you need it. Mark Langford, Huntsville, AL N56ML at hiwaay.net see KR2S project N56ML at http://home.hiwaay.net/~langford ------------------------------ _______________________________________________ See KRnet list details at http://www.krnet.org/instructions.html End of KRnet Digest, Vol 169, Issue 2 *************************************