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自由落体速度达到503km/h 俄罗斯男子创平流层跳伞世界纪录_我的网站

一 |     DETROIT -- Ford is recalling more than 238,000 Explorers in the U.S. because a rear axle bolt can fail, potentially causing a loss of drive power or allowing the SUVs to roll away while in park.The recall comes after U.S. safety regulators opened an investigation into the problem after getting two complaints that repairs didn't work in two previous recalls this year and in 2022.Affected are certain Explorers from the 2020 through 2022 model years. The National Highway Traffic Safety Administration says in documents posted Friday on its website that the rear axle horizontal mounting bolt can fracture and cause the driveshaft to disconnect, increasing the risk of a crash.Dealers will replace a bushing and the rear axle bolt. They also will inspect the rear axle cover for damage near the bolt hole and replace the cover if damage is found. Owners will be notified by letter starting Nov. 6.Ford said in documents that it knows of 396 reports of rear axle bolt failures, and fewer than 5% caused loss of power or let vehicles roll while they were in park. The company says it’s not aware of any crashes or injuries. NHTSA opened its investigation in June after getting complaints alleging loss of power due to failure of rear axle bolts even though the Explorers had received repairs under the previous recalls. Ford's remedy was to update software that automatically applied the parking brake to keep the vehicles from rolling away. But the agency said in documents that there was no remedy addressing the failed axle bolt. Ford said Friday that it was replacing axle bolts under service campaigns before the latest recall.。

二 |     8月24日消息，当地时间本月22日，俄罗斯极限跳伞运动员谢尔盖·博伊佐夫，在阿尔泰边疆区完成一场高难度高空跳伞挑战，一举刷新热气球载体跳伞项目的世界纪录，并全程对外公开直播。

三 |     本次挑战历时整整半年筹备，一支近百人的专业团队全程参与，涵盖热气球工程师、飞行器驾驶员、高空防护装备研发人员、气象分析师、跳伞技术顾问等多个岗位，大量设备采用俄罗斯本土自研技术完成制造。

四 |     正式挑战前，团队完成多轮严苛测试：在俄罗斯航天宇航员训练中心的压力舱内，模拟12000米高空低压环境开展人体耐受测试；整套跳伞防护装备在零下60摄氏度低温环境反复验证可靠性；同时借助风洞设备，反复打磨自由落体姿态、降落伞应急操作，并且完成多轮低高度预演跳伞，尽可能规避高空风险。

五 |     升空使用一台容积一万立方米的特制AX-12级别大型热气球，由俄罗斯航空运动联合会主席伊万·梅尼亚罗担任主飞行员，机载工程师杰尼斯·叶菲莫夫配合操作。    热气球当地时间早上6点39分起飞，整场升空飞行耗时3小时01分钟，气球最大升空高度达到11610米，同步刷新俄罗斯本土热气球飞行高度国家纪录。     博伊佐夫于7点54分17秒，在11551米高度离开吊篮纵身跃下，起跳瞬间，热气球自身移动速度约70公里每小时，舱外气温低至零下59摄氏度，高空空气稀薄，低温、缺氧、强气流多重风险叠加，对运动员身体状态、装备稳定性都是极大考验。

六 |     离开吊篮后，博伊佐夫进入自由落体阶段，持续时长2分30秒，下落峰值速度达到501公里每小时。

七 |     高速坠落过程中，运动员需要自主控制身体姿态，防止身体失控旋转，避免出现供氧故障、肢体冻伤等致命险情。    下落至距离地面1565米高度，他顺利启动主降落伞，降落伞开伞之后的滑翔降落时长4分49秒，从离舱到双脚落地，全程总降落时长7分19秒，最终平安降落在阿尔泰边疆区乌斯特·卡尔曼斯基地区，热气球机组人员也全部安全落地，挑战全员无受伤情况。

八 |     在此之前，该项目世界纪录由波兰极限运动员保持，起跳高度为10060米，博伊佐夫直接把纪录提升接近1500米。         

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Published on:05:59:46