Верно, но вышла новая версия эксты, уже давно, целиком композитная.
Да, но это только "благодаря" новейшим технологиям, смолам и углепластику, но это ОЧЕНЬ дорого для "рядового" ЛА.
А так металлическая ферма даёт повышенную прочность, безопасность при аварии.
Об этом и пишет авиационная публикация от AOPA про новую Extra NG:
"For more than 30 years, the German firm founded and led by Walter Extra, an engineer and former aerobatic competition pilot, has designed and produced incredibly strong, exquisitely crafted, and exceedingly durable aerobatic aircraft with one trait in common: all were built around steel-tube frames.
Steel frames gave them strength, rigidity, and crash survivability—but they also limited interior space and added weight. Modern rivals such as Game Composites with its GB1 and MX Aircraft with its MXS and MX2 avoided steel in favor of all-carbon-fiber construction, and their unlimited aerobatic airplanes deliver jaw-dropping performance.
Extra had long contemplated doing away with the steel structure but the founder wasn’t willing to make that leap until he was sure it wouldn’t compromise safety. About three years ago, he found a way to enhance crashworthiness, or “residual strength,” in carbon fiber.
“When I found a method of introducing residual strength, even in very thin (carbon fiber) shells as they are used in fuselage structures, I started thinking seriously about a new airplane,” Extra said. That concept became the NG, which was unveiled in 2019.
Extra said he hasn’t decided whether to seek a patent.
“I might make my idea publicly available to boost safety,” he said.
Once liberated from steel frames, Extra could make improvements he’d long sought: more interior space, a far larger front cockpit, a removable floor for ease of maintenance, fewer parts, and smoother surfaces with more aerodynamically efficient intersections".
