EC05-0198-11NASA Dryden aerospace engineer Michael Allen hand-launches a model motorized sailplane during a study validating the use of heat thermals to extend flight time.Image Credit: NASA/Carla Thomas Facebook Pinterest X LinkedIn Email https://www.nasa.gov/image-detail/amf-ec05-0198-11/Copy URL to clipboard> DownloadShareTakenAugust 12, 2005ProducerAFRCImage CreditNASA/Carla ThomasSize1920x1536pxPIA NumberEC05-0198-11