1930's Opposed Piston Aero Engine Design Revived? Jumo 205 & Gemini Explained

Video Description

Was the Jumo 205 simply too advanced for it's time, to be realised 100 years later how good it actually was? The Gemini Opposed piston engine is a relatively new engine based on the 1930's design, but is the opposed design any good as a modern efficient aero engine? Data sources: https://web.archive.org/web/20101206130000/http://ppdgemini.com:80/_PDF/Weight_Comparison_6-08_B&W.pdf https://web.archive.org/web/20101206125839/http://ppdgemini.com:80/_PDF/Gemini_100_Spec_Sheet_1-10-09_B&W.pdf https://www.flyrotax.com/products/912-is-sport-isc-sport Follow me on Instagram: https://www.instagram.com/lets_go_aviate/ IMAGE ATTRIBUTION Junkers Jumo 205 Berlin museum-author W2k2 (https://creativecommons.org/licenses/by-sa/3.0/deed.en) no changes Junkers Jumo 205 at the Polish Aviation Museum-author Zala (https://creativecommons.org/licenses/by-sa/4.0/deed.en) cropped JU-86 HB-IXE-author ETH-Bibliothek Zürich, Bildarchiv/Stiftung Luftbild Schweiz (https://creativecommons.org/licenses/by-sa/4.0/deed.en) crop+zoom Junkers Ju 86 bomber-Unknown author, Post-work Cobatfor (https://creativecommons.org/licenses/by-sa/4.0/deed.en) crop + zoom Dornier Do 18-Unknown author, post-work Cobatfor (https://creativecommons.org/licenses/by-sa/4.0/deed.en) no changes Do 24 V-1-author Karl Kössler (https://creativecommons.org/licenses/by-sa/3.0/deed.en) no changes Napier Deltic-author Chowells () (https://creativecommons.org/licenses/by-sa/3.0/deed.en) crop+zoom Junkers Jumo 205 cutaway-author Thomas Vogt from Paderborn, Deutschland (https://creativecommons.org/licenses/by-sa/2.0/deed.en) cropped Junkers Jumo 205 partial cross section-author Thomas Vogt from Paderborn, Deutschland (https://creativecommons.org/licenses/by-sa/2.0/deed.en) crop+zoom+overlaid arrows&text Bosch EV14 injector https://s4wiki.com/wiki/File:Bosch_EV14_injector_sizes.jpg (https://creativecommons.org/licenses/by/4.0/) cropped 3 injectors out Junkers Jumo 205 Muzeum Lotnictwa Polskiego-author Zala (https://creativecommons.org/licenses/by-sa/4.0/deed.en) crop+pan Jumo 207 B-2-author Duch (https://creativecommons.org/licenses/by-sa/4.0/deed.en) no changes Jumo 207 front-author Bergfalke2 (https://creativecommons.org/licenses/by-sa/3.0/deed.en) crop+pan Junkers JUMO 211 cross section-author Triple-green (https://creativecommons.org/licenses/by-sa/2.0/deed.de) cropped,text+arrow overlaid DB 601 cross section-author Bjoertvedt (https://creativecommons.org/licenses/by-sa/4.0/deed.en) text + arrow overlaid Jumo 205 front-author hmboo Electrician and Adventurer (https://creativecommons.org/licenses/by-nd/2.0/) no changes Jumo 205C-author Duch (https://creativecommons.org/licenses/by-sa/4.0/deed.en) cropped Junkers Jumo 210-author W2k2 (https://creativecommons.org/licenses/by-sa/3.0/deed.en) cropped Junkers Ju-86 B-1-author Swissair, Fotograf (https://creativecommons.org/licenses/by/4.0/) crop+zoom Inline 6 marine crank-author Marco Bernardini (https://creativecommons.org/licenses/by-sa/2.0/) cropped Jumo 205 at Kosice Aviation Museum-author User:VargaA (https://creativecommons.org/licenses/by-sa/4.0/deed.en) crop+zoom arrow overlaid Dornier Do 24 drawing-Unknown author, post-work Cobatfor (https://creativecommons.org/licenses/by-sa/4.0/deed.en) own drawing overlaid Jumo 205 cross section closeup-author Ricardo Reis from Lisboa, Portugal (https://creativecommons.org/licenses/by-sa/2.0/deed.en) cropped+overlaid text Jumo 207 cross section-author Bergfalke2 (https://creativecommons.org/licenses/by-sa/3.0/deed.en) overlaid text OHC head-author Pᴀᴜʟsᴛᴇʀ2 (https://creativecommons.org/licenses/by-sa/3.0/) overlaid cross Dornier Do18 engine installation-Unknown author, post-work Cobatfor (https://creativecommons.org/licenses/by-sa/4.0/deed.en) overlaid text Continental O-200-author YSSYguy at English Wikipedia (https://creativecommons.org/licenses/by-sa/4.0/deed.en) no changes VIDEO & ANIMATION ATTRIBUTION 120hp Ford B-Max Ecoboost animation by Motor1 (https://youtu.be/LNfQqHooQZI), license CC-BY Two-Stroke Engine (crossflow) animation-author A. Schierwagen using OpenOffice Draw (https://creativecommons.org/licenses/by-sa/3.0/deed.en) no changes Inline 6 animation-author MichaelFrey (https://creativecommons.org/licenses/by-sa/4.0/deed.en) cropped, rotated & further animation added Diesel engine Junkers Jumo-205 moving model-author 3dhdscan on sketchfab (https://creativecommons.org/licenses/by/4.0/) slightly cropped ME-262 WITH JET PROPULSION POWER PLANT by PublicResourceOrg (https://youtu.be/vLMU_r7A4UQ), license CC-BY Inline 3 animation-author MichaelFrey (https://creativecommons.org/licenses/by-sa/4.0/deed.en) cropped, rotated & further animation added Chapters: 0:00 Unconventional Engine Design 0:34 1.Emergence of the Opposed Piston Engine 3:12 2.Jumo 205 Design : Layout 4:11 3.Jumo 205 Design : Efficiency 9:47 4.Jumo 205 Design : Vibration 12:28 5.Jumo 205 Design : Lubrication 13:06 6.Jumo 205 Design : Shared Cylindder 15:00 7.Jumo 205 Verdict 16:38 8.Superior Gemini