Abstract: Aspects of the disclosure relate to an aerial vehicle. The aerial vehicle may include an envelope having a plurality of tendons and formed from a first plurality of gores. The aerial vehicle may also include one or more ballonets arranged within the envelope. An outer membrane may be arranged around at least part of the envelope and formed from a second plurality of gores. The outer membrane may include at least one panel attached at one side to the outer membrane between a pair of the second plurality of gores and attached at an opposite side to the envelope. The outer membrane may be arranged to improve aerodynamics of the envelope when the aerial vehicle is in flight.

Abstract: Aspects of the technology relate to an apparatus and method for testing a material for use in a lighter-than-air craft deployable in the stratosphere. The apparatus and method may include and use a base plate and at least one ring component to attach to the base plate to secure a portion of the material. The at least one ring component has an elliptical shape including a minor radius having a first predetermined length and a major radius having a second predetermined length. The base plate receives a gas to inflate and pressurize the portion of the material. The first predetermined length and second predetermined length are selected to impart a stress ratio up to a predetermined maximum ratio onto the portion of the material through a predetermined temperature range when the portion of the material is inflated to a predetermined pressure.

Abstract: Aspects of the disclosure relate to an aerial vehicle. The aerial vehicle may include an envelope having a plurality of tendons and formed from a first plurality of gores. The aerial vehicle may also include one or more ballonets arranged within the envelope. An outer membrane may be arranged around at least part of the envelope and formed from a second plurality of gores. The outer membrane may include at least one panel attached at one side to the outer membrane between a pair of the second plurality of gores and attached at an opposite side to the envelope. The outer membrane may be arranged to improve aerodynamics of the envelope when the aerial vehicle is in flight.