1 rich Libsyn https://www.libsyn.com 90 600 Welcome to Episode #69 of The Thermal.&amp;nbsp; &amp;nbsp;In this Episode of The Thermal, the Piper Pawnee has issues. Wing spar issues to be exact…we get an update from the Soaring Society of America’s Ken Sorensen. &amp;nbsp;Electric Gliders and engine failure. Do you lock the prop or let it spin? The manual says one thing but real-world data says another. We talk to a glider pilot boffin who used his own glider as a test bed. &amp;nbsp;And a new book called Why We Fly is a wonderful journey into our relationship with flying. We speak to author Caroline Paul about her lifelong obsession with flight. &amp;nbsp;That’s all on Episode #69 of The Thermal. The Thermal Podcast http://thethermalpodcast.libsyn.com/website <iframe title="Libsyn Player" style="border: none" src="//html5-player.libsyn.com/embed/episode/id/41144125/height/90/theme/custom/thumbnail/yes/direction/forward/render-playlist/no/custom-color/88AA3C/" height="90" width="600" scrolling="no" allowfullscreen webkitallowfullscreen mozallowfullscreen oallowfullscreen msallowfullscreen></iframe> https://assets.libsyn.com/secure/item/41144125