---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Tue 09/30/08: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:00 AM - Re: Mod 72 - Undercarriage mounting frame strengthening (craig bastin) 2. 07:35 AM - Re: Mod 72 - Undercarriage mounting frame strengthening (Rob Housman) 3. 09:23 PM - Mod 72 - Undercarriage mounting frame strengthening (Erich Trombley) ________________________________ Message 1 _____________________________________ Time: 04:00:11 AM PST US From: "craig bastin" Subject: RE: Europa-List: Mod 72 - Undercarriage mounting frame strengthening If you can get the tubes out again, easier said than do probably, I would suggest a shrink fit, if you are happy the insert tubes are the same size as the ID of the tubes after reaming then throwing the tubes in the freezer and GENTLY heating the UC frame should give you the clearance you need long enough to get them home mine took about 4 decent taps and they were home, mind you i did use a lathe and skimmed the tubes till they were within .01mm, the heating/cooling dropped the tube size to about .2mm smaller than the UC frame. I believe quite a few have opted for this method with good results craig -----Original Message----- From: owner-europa-list-server@matronics.com [mailto:owner-europa-list-server@matronics.com]On Behalf Of Rob Housman Sent: Tuesday, 30 September 2008 12:52 AM To: europa-list@matronics.com Subject: Europa-List: Mod 72 - Undercarriage mounting frame strengthening Having been working mostly on those factory mandated or recommended modifications of late, I now realize that it is much easier to build an airplane than it is to repair one. Mod 70 (Mass balance arm) was merely tedious, working deep in the tailcone, one handed, through small access holes, but Mod 73 (Tailplane retention) and Mod 59 (Shimmy damper) did not go well when following the written procedures, and now with Mod 72 there is more of that wonderful English understatement: Insert the tubes - they will probably need a light tap to fit them it says in the procedure. English hammers must be considerably larger and heavier than American hammers (or 16.5 mm reamers must be a bit larger) because a light tap does nothing. After pounding away for entirely too long, and peening the ends of the tubes where the hammer repeatedly struck, I finally fabricated a steel spud to put between the offending pin and the hammer. This made it easier to keep pounding with less damage to the pins, or to the adjacent smaller diameter tubes to which the engine mounts attach if I were to miss the target. The steel spud is starting to look like a mushroom from all of those light taps. I should have retained my initial skepticism regarding the fit of painted tubes, which after painting with etch primer are larger than 16.5mm, but no, I foolishly believed that the factory had actually tried this procedure. Well folks, the paint makes the pin almost impossible to fit. Fearing complaints from my neighbors about so much hammering on a peaceful Sunday afternoon I finally quit pounding with the intention of resuming mid-day today when most of my neighbors will be away at work. As of yesterday afternoon one pin was snug against the bolt attaching the frame to the fuselage and the other was still barely halfway home. Now, if I could find one of those English hammers at Home Depot. Best regards, Rob Housman Irvine, CA Europa XS Tri-Gear A070 Airframe complete ________________________________ Message 2 _____________________________________ Time: 07:35:00 AM PST US From: "Rob Housman" Subject: RE: Europa-List: Mod 72 - Undercarriage mounting frame strengthening Craig & Martin: Good suggestion in re: taking advantage of thermal effect on size. However, in my case one pin is in and the other is far enough in to preclude removal and starting over. Prior to starting the Mod I measured both pins and confirmed that each was less than 16.5mm (PRIOR to applying the etch primer) and not tapered, and the hand reamer was fabricated by a local shop with whom I've done business for a long time, and it is to size. Were it not for the factory's instruction to paint the pins (and my foolishness in following that suggestion) the pins would have fit easily. Best regards, Rob Housman Irvine, CA Europa XS Tri-Gear A070 Airframe complete From: owner-europa-list-server@matronics.com [mailto:owner-europa-list-server@matronics.com] On Behalf Of craig bastin Sent: Tuesday, September 30, 2008 4:07 AM Subject: RE: Europa-List: Mod 72 - Undercarriage mounting frame strengthening If you can get the tubes out again, easier said than do probably, I would suggest a shrink fit, if you are happy the insert tubes are the same size as the ID of the tubes after reaming then throwing the tubes in the freezer and GENTLY heating the UC frame should give you the clearance you need long enough to get them home mine took about 4 decent taps and they were home, mind you i did use a lathe and skimmed the tubes till they were within .01mm, the heating/cooling dropped the tube size to about .2mm smaller than the UC frame. I believe quite a few have opted for this method with good results craig -----Original Message----- From: owner-europa-list-server@matronics.com [mailto:owner-europa-list-server@matronics.com]On Behalf Of Rob Housman Sent: Tuesday, 30 September 2008 12:52 AM Subject: Europa-List: Mod 72 - Undercarriage mounting frame strengthening Having been working mostly on those factory mandated or recommended modifications of late, I now realize that it is much easier to build an airplane than it is to repair one. Mod 70 (Mass balance arm) was merely tedious, working deep in the tailcone, one handed, through small access holes, but Mod 73 (Tailplane retention) and Mod 59 (Shimmy damper) did not go well when following the written procedures, and now with Mod 72 there is more of that wonderful English understatement: "Insert the tubes - they will probably need a light tap to fit them" it says in the procedure. English hammers must be considerably larger and heavier than American hammers (or 16.5 mm reamers must be a bit larger) because "a light tap" does nothing. After pounding away for entirely too long, and peening the ends of the tubes where the hammer repeatedly struck, I finally fabricated a steel spud to put between the offending pin and the hammer. This made it easier to keep pounding with less damage to the pins, or to the adjacent smaller diameter tubes to which the engine mounts attach if I were to miss the target. The steel spud is starting to look like a mushroom from all of those "light taps." I should have retained my initial skepticism regarding the fit of painted tubes, which after painting with etch primer are larger than 16.5mm, but no, I foolishly believed that the factory had actually tried this procedure. Well folks, the paint makes the pin almost impossible to fit. Fearing complaints from my neighbors about so much hammering on a peaceful Sunday afternoon I finally quit pounding with the intention of resuming mid-day today when most of my neighbors will be away at work. As of yesterday afternoon one pin was snug against the bolt attaching the frame to the fuselage and the other was still barely halfway home. Now, if I could find one of those English hammers at Home Depot.. Best regards, Rob Housman Irvine, CA Europa XS Tri-Gear A070 Airframe complete ________________________________ Message 3 _____________________________________ Time: 09:23:38 PM PST US From: "Erich Trombley" Subject: Europa-List: Mod 72 - Undercarriage mounting frame strengthening Rob, Before hacking off the end of the insert I would try and first remove it using a slide hammer. While you won't find a slide hammer at Home Depot they are readily available at Harbor Freight or an auto body supply house. With the appropriate attachment on the slide hammer the insert should be easily extracted at which point the primer can be removed and the insert re-installed with wet primer. Good luck. Erich Trombley N28ET Classic Mono 914 ____________________________________________________________ Click for free info on discount teaching degrees programs. http://thirdpartyoffers.juno.com/TGL2131/fc/Ioyw6iif8jdcKxWaHjlqS73Qqd6LNJ5JIk3wkkGf8C6lJ1MLlbEUV5/ ------------------------------------------------------------------------------------- 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.