ULF-1 Discussion Archive
Anonymous static archive of the former Mailman list
Anonymous static archive of the former Mailman list
Re: [ULF-1] Ulf-1 Digest, Vol 69, Issue 1
Hi Austin, Thanks for your kind words. We did not deviate at all on any of the structural component dimensions. The top and bottom spar caps were built per plan. For the motor mounts in each wing, we did beef up the rear of the spar outboard of rib #2, ribs #1 and #2, and the diagonal rib. For the ribs, this involved using the 3/4” Owings Corning purple foam from Home Depot (instead of the 1/2” Dow blue foam), and laminating both sides with thin Finnish Birch ply. An extra small diagonal rib is also planned between Ribs 1 and 2. The extra weight here will be saved with the R/C servo actuated spoilers, which eliminates a lot of cable, pulleys, and cranks. Also, we are saving more weight by using Am Steel braided line for all the control cables instead of regular aircraft cable. Member 67 Sent from my iPhone > On May 2, 2018, at 9:54 PM, Member 111 <[email]> wrote: > > Member 67, > > Thank you for giving us some insight into your very interesting build. I watched your Destructive Test on YouTube several times. > > Did you deviate from the drawings with respect to the spar cap dimensions as well or just in the attachment fittings as described? > > I was wondering if the added the weight of the power system and motor pylons needed some beefing. > > Thanks again for pioneering, > > Austin in UT > >> On May 2, 2018, at 3:03 PM, [email] wrote: >> >> Send Ulf-1 mailing list submissions to >> [email] >> >> To subscribe or unsubscribe via the World Wide Web, visit >> http://lists.ulf-1.com/listinfo.cgi/ulf-1-ulf-1.com >> or, via email, send a message with subject or body 'help' to >> [email] >> >> You can reach the person managing the list at >> [email] >> >> When replying, please edit your Subject line so it is more specific >> than "Re: Contents of Ulf-1 digest..." >> >> >> Today's Topics: >> >> 1. ULF-1 spar destructive test (Member 117) >> 2. Re: ULF-1 spar destructive test (Member 72) >> >> >> ---------------------------------------------------------------------- >> >> Message: 1 >> Date: Wed, 2 May 2018 14:54:25 +0100 >> From: Member 117 <[email]> >> To: [email] >> Subject: [ULF-1] ULF-1 spar destructive test >> Message-ID: <[email]> >> Content-Type: text/plain; charset="us-ascii" >> >> Good afternoon >> >> I am preparing all the materials to begin the construction of a ULF-1 in Portugal, and I saw on the web, that the EAA Chapter 309 in North Carolina performed a ULF-1 Spar destructive test, it is possible to have access to these data? and if the construction of the spar was carried out according to the instructions in the manual ? >> >> thank you >> >> Best regards, >> >> Member 117 >> >> >> -------------- next part -------------- >> An HTML attachment was scrubbed... >> URL: <http://lists.ulf-1.com/private.cgi/ulf-1-ulf-1.com/attachments/[phone]/8d12f2af/attachment-0001.html> >> >> ------------------------------ >> >> Message: 2 >> Date: Wed, 2 May 2018 17:00:29 -0400 >> From: Member 72 <[email]> >> To: [email] >> Subject: Re: [ULF-1] ULF-1 spar destructive test >> Message-ID: <[email]> >> Content-Type: text/plain; charset="utf-8" >> >> Hi Nuno, >> >> Good luck with your >> Build! We deviated from the plans with the attachment fittings at the wing roots. The plans call for tubular rivets to be used to attach the steel fittings to the spar caps. We did not have the tooling to fabricate these large rivets. So, at each station that required a rivet, we drilled a 1/2? hole and epoxied a nylon lug or bushing into the hole. The nylon lugs have a 1/4? hole drilled down the center to accept an AN-4 aviation bolt. We epoxied the steel spar fittings on, with their 1/4? holes pre-drilled to match the holes on the nylon lugs. Then, we added the bolts, washers and nuts. We were in contact with Member 9, the designer, at Aero in Germany. Because of our deviation to his plans on the most heavily loaded part of the airframe, he asked us to perform a destruction test and gave us a minimum breaking strength. Fortunately we were well over his minimum figure, and he blessed our design deviation! If we were to do it again, we would consider using 1/2? pheno > li >> c rod rather than the nylon. But, the nylon lug material worked OK. >> >> Best regards, >> Member 72 >> >> >> >> Sent from my iPhone >> >>> On May 2, 2018, at 9:54 AM, Member 117 <[email]> wrote: >>> >>> Good afternoon >>> >>> I am preparing all the materials to begin the construction of a ULF-1 in Portugal, and I saw on the web, that the EAA Chapter 309 in North Carolina performed a ULF-1 Spar destructive test, it is possible to have access to these data? and if the construction of the spar was carried out according to the instructions in the manual ? >>> >>> thank you >>> >>> Best regards, >>> >>> Member 117 >>> >>> >>> _______________________________________________ >>> ULF-1 discussion list -- [email] >>> >>> Subscribe, Unsubscribe, Preferences, List information: >>> http://lists.ulf-1.com/listinfo.cgi/ulf-1-ulf-1.com >> -------------- next part -------------- >> An HTML attachment was scrubbed... >> URL: <http://lists.ulf-1.com/private.cgi/ulf-1-ulf-1.com/attachments/[phone]/ff554e2a/attachment-0001.html> >> >> ------------------------------ >> >> Subject: Digest Footer >> >> _______________________________________________ >> Ulf-1 mailing list >> [email] >> http://lists.ulf-1.com/listinfo.cgi/ulf-1-ulf-1.com >> >> >> ------------------------------ >> >> End of Ulf-1 Digest, Vol 69, Issue 1 >> ************************************ > _______________________________________________ > ULF-1 discussion list -- [email] > > Subscribe, Unsubscribe, Preferences, List information: > http://lists.ulf-1.com/listinfo.cgi/ulf-1-ulf-1.com