👍 On Sun, Oct 10, 2021 at 12:59 PM Mark Wegmet <markweg...@charter.net> wrote:
> I'm sure that someone more knowledgeable than I am will correct this if > I miss speak... the difference (other than length and height) between > the original KR-2 spars and the KR2S spars is that the original plans > for the KR2 spars had the mahogany plywood (shear web?) on one side of > the spar, and the 2S spar has this on both sides of the spars > (necessitating the addition of weep holes) . The basic "ladder" style > construction of the primary spar structure is, essentially, the same. > > YRMV > > Regards, > > Mark W (N952MW res) > > On 10/10/2021 11:40 AM, Flesner wrote: > > On 10/10/2021 10:33 AM, Ryan wrote: > >> In this test it looks like the upper spar cap broke because the shear > >> web failed. > >> http://www.krnet.org/mvn2008/080921265.jpg > >> My KR2 comes in at 633# empty. So that makes it 153# overweight to > >> start with. > >> What is the new wing with the larger spar caps that you mention? > >> Is the KR2S wing spars different than the original like I have? > >> Ryan > > > > > +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > > > > > > Spar caps are not stressed vertically but horizontally. When the wing > > is loaded the upper spar cap is stressed in compression and the lower > > spar cap is stressed in tension, hence the shear web failing > > horizontally between the two. > > > > My target empty weight was 650 #'s but I came in at 765 # and there > > are heavier then mine flying. That does not justify building to that > > spec but simply to say yours is one of the lighter one completed lately. > > > > As to the new wing, if you are not familiar with the new wing then you > > are about 10 years behind on the latest KR info. Someone please post > > the links to all the new wing info for those not familiar. If your > > KR is complete with the RAF48 airfoil don't consider going back and > > rebuilding the wing for the extra 10 mph claimed. That will only keep > > you from flying sooner. > > > > On the "153# overweight", the 480 pound KR2 that Ken build is not a > > stake in the ground that can't be passed. The KR is a very robust > > design and you simply need to consider how the extra weight will > > affect your KR both in structure and performance. Many of the > > recently finished awesome KR's go well past the 700# mark. Just know > > and accept the limitations and penalties of the extra weight. > > > > To my knowledge the 2S spars are the same as the standard 2. It is > > the new airfoil that may or may not change the spars depending on the > > exact build you chose. Someone will give you links to a week or two > > worth of reading. > > > > Larry Flesner > > ________________________________ > > -Please see LIST RULES and KRnet info at http://www.krnet.org/info.html > > -Change list delivery options at > > https://list.krnet.org/list/krnet.list.krnet.org/ Affinity List Info > > Board > > -Search recent KRnet Archives at > > https://list.krnet.org/empathy/list/krnet.list.krnet.org/ > > -Search John Bouyea's decades of archive at > > https://www.mail-archive.com/krnet@list.krnet.org/ > ________________________________ > -Please see LIST RULES and KRnet info at http://www.krnet.org/info.html > -Change list delivery options at > https://list.krnet.org/list/krnet.list.krnet.org/ Affinity List Info Board > -Search recent KRnet Archives at > https://list.krnet.org/empathy/list/krnet.list.krnet.org/ > -Search <https://list.krnet.org/empathy/list/krnet.list.krnet.org/-Search> > John Bouyea's decades of archive at > https://www.mail-archive.com/krnet@list.krnet.org/ ________________________________ -Please see LIST RULES and KRnet info at http://www.krnet.org/info.html -Change list delivery options at https://list.krnet.org/list/krnet.list.krnet.org/ Affinity List Info Board -Search recent KRnet Archives at https://list.krnet.org/empathy/list/krnet.list.krnet.org/ -Search John Bouyea's decades of archive at https://www.mail-archive.com/krnet@list.krnet.org/
