CHARTS FOR 1957 INSPECTION – ION PROPULSION UNIT AT EXTREME ATTITUDESChart used for talk on electric propulsion systems at the NACA Lewis’ 1957 Inspection. Image Credit: NASA Facebook Pinterest X LinkedIn Email https://www.nasa.gov/image-detail/grc-1957-c-45971/Copy URL to clipboard> DownloadShareImage CreditNASASize3000x2402px