---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Thu 01/23/25: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 08:23 PM - What did you do with your europa this week - 24/01/25 (Area-51) 2. 10:04 PM - The Obsidian Files - Mono Classic Undercarriage (Area-51) ________________________________ Message 1 _____________________________________ Time: 08:23:09 PM PST US Subject: Europa-List: What did you do with your europa this week - 24/01/25 From: "Area-51" This week 181 had a UMA manifold pressure gauge fitted and repositioned Hobbs meter into undercarriage lever void... It was an adventure... First a new piece of panel plate was drafted, and this time rather than waiting for pieces to be lazer cut stuff got 3D printed instead. Two pieces were printed, the panel plate and gps pilot mounting. Everything worked great; except the $75 ebay "NOS" uma gauge... it did not work correctly... so the gauge was removed and dismantled for inspection. Inside was found corrosion on the primary lever arm. So the arm got polished and unit bench tested. Testing showed the bellows was leaking; a very ineffective climb/descend gauge; opening the gauge and seeing the inside quality it is a $30 piece of average; not a single ruby bearing anywhere to be seen; somebody is making a gigantic profit margin... So in the end an auto garage vacuum pressure gauge was fitted to extract data information with prior to swapping out the 80hp to 100hp. Now need to replace UMA gauge with a functioning unit; very dissapointing when people on ebay sell something as "new" and it ends up arriving ready for the garbage bin. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=515241#515241 Attachments: http://forums.matronics.com//files/82193a0e_9261_4681_bb4d_c63d63c56464_148.jpeg http://forums.matronics.com//files/4a813f80_b0af_48d2_811c_a758d4850ab2_169.jpeg http://forums.matronics.com//files/bcd463eb_12aa_411e_a3bb_45e9141d199c_805.jpeg http://forums.matronics.com//files/ca9aa34a_3213_42ed_92fb_605077c079bb_825.jpeg http://forums.matronics.com//files/22a6bc3d_dc75_4694_bdf9_c38b8bb78aab_668.jpeg http://forums.matronics.com//files/1a633917_8641_4758_a71f_66cd8d5aa9f0_117.jpeg ________________________________ Message 2 _____________________________________ Time: 10:04:29 PM PST US Subject: Europa-List: The Obsidian Files - Mono Classic Undercarriage From: "Area-51" In this chapter of the obsidian files we investigate the undercarriage of the Mono Classic and what the numbers returned. The study came about through a primary request to review the possibility of fitting a 75" propeller that had been offered for trial, and an 8.50x6 tyre... The short answer to both these opportunities was, "not without raising the nose of the aircraft while on the ground and redesigning the undercarriage swing arm". So the swing arm got completely redesigned and results stress tested. Results showed that at AUW of 650kg the OEM swing arm, at 4.2kg mass, was able to yield separately at 0.5g lateral and 2.5g vertical, and able to yield at 0.5g lateral and 1.5g vertical combined. In contrast a redesigned 4041-T Chromoly tubular arm in 2.00mm wall thickness, at 4.7kg mass, was able to yield separately at 1.5g lateral and 2.5g vertical, and at 0.5g lateral and 2.5g vertical combined... The same design utilising a 3.00mm wall, with a mass of 7.0kg, was able to yield 2.5g lateral and 4g vertical. The design was rolled back to 2.00mm wall thickness. Results indicated similar numbers across the OEM and substitute design. A lighter 1.65mm wall thickness was trialed and although weighing 3.2kg failed stress testing at AUW of 650kg plus 2.5g vertical loading. Overall the tubular chromoly design displayed more robust results than the OEM unit. Fitting of an 8.50x6 tyre requires lateral clearance for 200mm width and 560mm OD of the tyre. Utilising the same swing geometry as the OEM arm and trimming of the aircraft belly skin forward of the centre tunnel bulkhead panel is required for retraction. Attention to the throttle sector arm cover may be required also. The redesigned tubular swing arm provides retraction stops to mitigate a wheel up landing scenario. Utilising an 8.50x6 tyre on the classic mono allows for fitting of a 75" propeller. With the tail wheel down a propeller tip to ground clearance of 8.0" is achieved. With the aircraft in a Take Off Attitude with tail wheel raised off the ground propeller tip to ground clearance is 6.0". These dimensions have been calculated with allowance for tyre squish. Although the above clearances look appealing they will be reduced considerably when a momentary rut combined with an over forward pitch is seen. Running the above 75" prop option would be for the experienced high time mono pilot only. That's all for this episode of the Obsidian Files today... Read this topic online here: http://forums.matronics.com/viewtopic.php?p=515242#515242 Attachments: http://forums.matronics.com//files/50bc311b_3e4d_494d_a3bb_d5071b03b543_170.jpeg http://forums.matronics.com//files/46b095bd_5830_4244_af43_e61a994d9247_187.jpeg http://forums.matronics.com//files/c7abc68e_2380_493d_80eb_edf9f3929bb9_985.jpeg http://forums.matronics.com//files/f9a9e4b3_7e01_412a_b751_26092e1a2d5a_874.jpeg http://forums.matronics.com//files/48886d67_2191_4125_b222_81d380688b80_621.jpeg http://forums.matronics.com//files/cea60639_3d22_4200_9302_7317281cf1c7_886.jpeg http://forums.matronics.com//files/66aa3aa5_2720_4d87_ab4b_64fa3ec16d90_829.jpeg http://forums.matronics.com//files/0953c017_16ce_4ed0_a8ac_9ec1116433cf_297.jpeg http://forums.matronics.com//files/f24ef0b9_0bed_40b4_819d_86769780a2d7_126.jpeg http://forums.matronics.com//files/0c2e5949_ece5_416b_b0ac_37f31426070d_118.jpeg http://forums.matronics.com//files/0c342fc9_aa45_4a33_bb3d_29126d11fc23_600.jpeg ------------------------------------------------------------------------------------- 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.