---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Sat 08/10/19: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 09:03 AM - Mogas ethanol and non treated tanks (William Daniell) 2. 02:30 PM - Re: Reaming of spar and CM bushes (Bud Yerly) 3. 02:49 PM - Re: Reaming of spar and CM bushes (Pete) 4. 02:55 PM - Re: Mogas ethanol and non treated tanks (SPURPURA) 5. 07:23 PM - Re: Reaming of spar and CM bushes (Bud Yerly) ________________________________ Message 1 _____________________________________ Time: 09:03:21 AM PST US From: William Daniell Subject: Europa-List: Mogas ethanol and non treated tanks Can some tell me if mogas presents any risk to older fuel tanks. I have a vague recollection of possible ethanol issues causing cracks. My kit was bought in 2003. Thanks Will William Daniell +1 786 878 0246 ________________________________ Message 2 _____________________________________ Time: 02:30:58 PM PST US From: Bud Yerly Subject: RE: Europa-List: Reaming of spar and CM bushes Fred, Back before my time when mod 52 was done for the GW increase. The classic had two 3/8 pins originally. Mod 52 uses the =BD inch pins and a spar stra p . As the wings pull forward under load, the fuselage would flex so they put i n the cross bar and the new sockets. Then the concern was that the starboard wing spar could become dislodged fr om the socket and interfere with controls. The quick fix was to hold in th e spar tip with a pip pin. The port wing was figured would stay put, and t he spar strap would prevent flexing of the spar. That is all I know. Andy would have the particulars on the detailed histor y. It sort of all makes sense. Best Regards, Bud Yerly Sent from Mail for Window s 10 ________________________________ From: owner-europa-list-server@matronics.com on behalf of Fred Klein Sent: Thursday, August 8, 2019 1:29:43 AM Subject: Re: Europa-List: Reaming of spar and CM bushes Bud=85you mention the use of the SouthCo pip pin on the port side and the A llen bolt pin on starboard. Do you know the reason for using different types of pins here? Is there any downside to using SouthCo pip pins both port and starboard?=85 seems I=92ve heard that some builders have done so. Fred On Aug 7, 2019, at 8:35 PM, Bud Yerly > wrote: The SouthCo pip pin is nominally .4985 inches. The Allen bolt pin for the starboard side is .497 to .495. ________________________________ Message 3 _____________________________________ Time: 02:49:06 PM PST US From: Pete Subject: Re: Europa-List: Reaming of spar and CM bushes What i have never understood, is why the cockpit module spar pin bushings ar e not vertical slots, because when the wings are flexing under G, the lift p ins take the fuse lift loads, and the spar flexing (under positive G) actua lly force the spar pins _downard_ against the cockpit module....obviously t otally counter-productive. Pete A239 > On Aug 10, 2019, at 5:29 PM, Bud Yerly wrote: > > Fred, > Back before my time when mod 52 was done for the GW increase. The classic had two 3/8 pins originally. Mod 52 uses the =C2=BD inch pins and a spar s trap . > > As the wings pull forward under load, the fuselage would flex so they put i n the cross bar and the new sockets. > > Then the concern was that the starboard wing spar could become dislodged f rom the socket and interfere with controls. The quick fix was to hold in th e spar tip with a pip pin. The port wing was figured would stay put, and th e spar strap would prevent flexing of the spar. > > That is all I know. Andy would have the particulars on the detailed histo ry. It sort of all makes sense. > > Best Regards, > Bud Yerly > > Sent from Mail for Windows 10 > > From: owner-europa-list-server@matronics.com on behalf of Fred Klein > Sent: Thursday, August 8, 2019 1:29:43 AM > To: europa-list > Subject: Re: Europa-List: Reaming of spar and CM bushes > > Budyou mention the use of the SouthCo pip pin on the port side an d the Allen bolt pin on starboard. > > Do you know the reason for using different types of pins here? > > Is there any downside to using SouthCo pip pins both port and starboard? seems I=99ve heard that some builders have done so. > > Fred > >> On Aug 7, 2019, at 8:35 PM, Bud Yerly wrote: >> >> The SouthCo pip pin is nominally .4985 inches. >> The Allen bolt pin for the starboard side is .497 to .495. > > ________________________________ Message 4 _____________________________________ Time: 02:55:48 PM PST US Subject: Europa-List: Re: Mogas ethanol and non treated tanks From: "SPURPURA" Mogas has no effect on polyethylene, thats what they make gas cans of. -------- N951EU - Tri-gear & 912ULS, N77EU- Mono & 914 I'D RATHER HAVE A BOTTLE IN FRONT OF ME THAN A FRONTAL LABOTAMY. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=490791#490791 ________________________________ Message 5 _____________________________________ Time: 07:23:05 PM PST US From: Bud Yerly Subject: RE: Europa-List: Reaming of spar and CM bushes On first glance one would see it that way. The lift pins on the aircraft side (like most gliders) take all the lifting load so the wing spars don=92t really bend much and the wing spar pins are in fact set properly to do their one and only job, absorb the bending shea r load of the two spars. The force of the non bending spars put little for ce on the cockpit module (in theory). I suppose one could take out the coc kpit sockets and in a perfect positive load the spar pins would have no eff ect on the cockpit module. However, as you intuitively figured out, the sp ars have to be attached to the cockpit/fuselage to keep the wings from shif ting laterally, as well as aft bending and forward bending and of course ho w the heck could we rig the wings without the cockpit module pins and socke ts... We killed this horse some years ago and somehow all of us engineering types figured out John Bewley got it right when doing the original structural an alysis when the prototype was built. His testament is there are no ADs on his structural work. His rework of the glider wing spar (Mod78) makes that wing a brute. No need for a spar strap for sure. Best Regards, Bud Yerly Sent from Mail for Window s 10 ________________________________ From: owner-europa-list-server@matronics.com on behalf of Pete Sent: Saturday, August 10, 2019 5:47:37 PM Subject: Re: Europa-List: Reaming of spar and CM bushes What i have never understood, is why the cockpit module spar pin bushings a re not vertical slots, because when the wings are flexing under G, the lift pins take the fuse lift loads, and the spar flexing (under positive G) ac tually force the spar pins _downard_ against the cockpit module....obvious ly totally counter-productive. Pete A239 On Aug 10, 2019, at 5:29 PM, Bud Yerly > wrote: Fred, Back before my time when mod 52 was done for the GW increase. The classic had two 3/8 pins originally. Mod 52 uses the =BD inch pins and a spar stra p . As the wings pull forward under load, the fuselage would flex so they put i n the cross bar and the new sockets. Then the concern was that the starboard wing spar could become dislodged fr om the socket and interfere with controls. The quick fix was to hold in th e spar tip with a pip pin. The port wing was figured would stay put, and t he spar strap would prevent flexing of the spar. That is all I know. Andy would have the particulars on the detailed histor y. It sort of all makes sense. Best Regards, Bud Yerly Sent from Mail for Window s 10 ________________________________ From: owner-europa-list-server@matronics.com > on behalf of Fred Klein > Sent: Thursday, August 8, 2019 1:29:43 AM >> Subject: Re: Europa-List: Reaming of spar and CM bushes Bud=85you mention the use of the SouthCo pip pin on the port side and the A llen bolt pin on starboard. Do you know the reason for using different types of pins here? Is there any downside to using SouthCo pip pins both port and starboard?=85 seems I=92ve heard that some builders have done so. Fred On Aug 7, 2019, at 8:35 PM, Bud Yerly > wrote: The SouthCo pip pin is nominally .4985 inches. The Allen bolt pin for the starboard side is .497 to .495. ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message europa-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Europa-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/europa-list Browse Digests http://www.matronics.com/digest/europa-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.