---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Thu 05/25/23: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 02:22 AM - Re: Re: Door latch shoot-bolt stop (D McFadyean) 2. 07:39 PM - The Obsidian Files - A Telling Tail (Area-51) ________________________________ Message 1 _____________________________________ Time: 02:22:24 AM PST US From: D McFadyean Subject: Re: Europa-List: Re: Door latch shoot-bolt stop I like the root gusset, although it increases frontal area (but reduces wetted area)! Duncan McF do not archive > On 24 May 2023 at 15:11 Rick Moss wrote: > > > > I have been making and supplying these FOC to Europa owners. > > Mine are currently being assessed by the LAA, with approval expected this week. Mine are glued on rather than having screw holes. > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=510858#510858 > > > > > Attachments: > > http://forums.matronics.com//files/img_3682_188.jpeg > > > > > > ________________________________ Message 2 _____________________________________ Time: 07:39:50 PM PST US Subject: Europa-List: The Obsidian Files - A Telling Tail From: "Area-51" In this episode of the obsidian files we take a look at the empennage section of the europa and investigate ways to make it more efficient. For this round of back yard science we have taken our pig and removed all of its apendag but for the vertical stab... and vwalla our pig has instantly been transformed into a pug, sorry plug.... First we ran the pig (3B) head on into a 400kt stream of zero Alpha air and recorded the numbers... then we did the same with two variants, one with an added concave style empennage (Tubby Tub) and one with a more convex style empennage (3X2). The modelling on both variants was quick and crude with the sole requirement being directional signalling; better, or worse... what we ended up with was one shape similar to a Bonanza and the other a Pipistrel Between all variants the results were not that dissimilar; so the compare & contrast aspect of this study was not remarkable. Additional runs were also performed at 100kt. Our meshing resolution was set to high and run through 100 solution cycles each. Results were as follows: 204m/s (400kt) Alpha 0 (Drag, Lift) 3B (factory) - 141kg, 2kg TubbyTub (concave) - 149kg, 2kg 3X2 (convex) - 149kg, 11kg At 51m/s (100kt) all pugs presented similarly at 9kg Drag and 0kg Lift. Acoustically similar results were returned however the acoustic footprints were quite different and all becoming active aft of the fuselage max cross-section. A further journey into this phenomenon revealed boundary layer friction/cavitation as the cause for acoustic noise around the fuselage; slower air close to the surface being pulled back into free stream velocity some one inch above. As we increase velocity this acoustic noise increases in amplitude. However at 100kt this accoustic energy is only 50-60db; so we could say daytime ambient silent, i.e inaudible over the drone of nature. So in the end the results were no greatly different to each other however out of the three little pigs the Europa's factory empennage shape came out on top on all accounts. Europa declared "winner" again! Read this topic online here: http://forums.matronics.com/viewtopic.php?p=510861#510861 Attachments: http://forums.matronics.com//files/da05e291_988c_4e70_ac22_5a85008acf54_146.jpeg http://forums.matronics.com//files/6cedb21a_f2fa_490c_b787_8dbe52d162b4_309.jpeg http://forums.matronics.com//files/e89d5af5_7854_4d94_bb69_864683ea9747_203.jpeg http://forums.matronics.com//files/b61abb89_b44f_460b_895e_7e5bca549482_565.jpeg http://forums.matronics.com//files/c9491f31_814b_4b30_bbf9_57776a55e856_209.jpeg http://forums.matronics.com//files/5005d0db_e02e_4c21_af0c_f373a692149f_119.jpeg http://forums.matronics.com//files/205c9c16_3ec2_4f94_a734_e2be0b6b534d_161.jpeg http://forums.matronics.com//files/92279d85_3277_4713_8fa7_71e64ea3e344_189.jpeg http://forums.matronics.com//files/3e9ebb74_a652_4e1e_9439_23e7cb0cac22_135.jpeg http://forums.matronics.com//files/8fa9ac5b_67b1_4193_ad30_ecd1ab51e410_355.jpeg http://forums.matronics.com//files/7c6fe9f2_a7a0_41c9_b3ca_dd0e7b71da7c_130.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.