52daqing 论坛,为全国人民代表(网名认证: "大庆家德帝", 请勿与"北京庆丰帝"弄混)所运营 - 通过执法, 产品与服务改变中国,社会, 为公众创造健康, 幸福, 安全与和谐的工作生活环境. 5秒注册, 匿名访问, 自由表达, 不受限. 我们的口号是: 有实力, 更有战绩. 我们主要擅长以人民, 习主席,法律, 美军,外星人的名义公开打击党员犯罪,专啃硬骨头. 关于本站读者群体的实力? 请先了解一下AlienPuppyHawaii.com的业务领域和读者, 例如TRUMP总统和CIA的实力.旅行问GPT, 现在BOEING747都退役了,说4台发动机耗油. 问 …回复帖子

回复帖子: 问GPT, 现在BOEING747都退役了,说4台发动机耗油. 问了它, 改成两台行不行. GPT回答如下:

<blockquote><div class="quotetitle">引用于 <a class="profile-link highlight-default" href="#">minsheng</a> 在 2025-09-28, 下午3:17</div>其实我们知道答案, 就是问问. 停产归停产, 但是很多旧飞机就是便宜, 所以全世界还有小公司, 私人公司, 土豪在用747, MD-80这种经典. 改成货机, 或者空中监狱CON AIR.
Great technical question 👍 Let me unpack it clearly.
The short version: No, Boeing can’t just swap the four engines on a 747 for two big GE90 or GEnx engines.
Here’s why:
<h3 data-start="185" data-end="228">1. Design Certification &amp; Structure</h3>
<ul data-start="229" data-end="620">
<li data-start="229" data-end="326">
The Boeing 747 was designed, certified, and structurally built as a four-engine aircraft.
</li>
<li data-start="327" data-end="471">
Engine thrust isn’t just about power — it affects wing structure, weight distribution, fuel systems, hydraulics, and landing gear loads.
</li>
<li data-start="472" data-end="620">
Re-engineering it to handle two massive engines would basically require a new aircraft design and certification program, which costs billions.
</li>
</ul>
<h3 data-start="622" data-end="665">2. Engine Thrust vs Aircraft Weight</h3>
<ul data-start="666" data-end="979">
<li data-start="666" data-end="742">
A GE90-115B (used on the 777-300ER) produces ~115,000 lbs of thrust.
</li>
<li data-start="743" data-end="829">
Four engines on a 747-8 (GEnx-2B67) produce ~66,500 lbs each → ~266,000 lbs total.
</li>
<li data-start="830" data-end="979">
Two GE90s (230,000 lbs total) are less than the original four (266,000 lbs). Not enough thrust margin for a safe 747 takeoff with max weight.
</li>
</ul>
<h3 data-start="981" data-end="1003">3. Wing Design</h3>
<ul data-start="1004" data-end="1230">
<li data-start="1004" data-end="1109">
A 747’s wings are designed for outboard engine placement to balance lift and reduce wing bending.
</li>
<li data-start="1110" data-end="1230">
With only two inboard engines, the aerodynamic loads change dramatically — the wing would need a total redesign.
</li>
</ul>
<h3 data-start="1232" data-end="1252">4. Economics</h3>
<ul data-start="1253" data-end="1520">
<li data-start="1253" data-end="1342">
Developing a “twin-engine 747” would cost nearly as much as designing a new aircraft.
</li>
<li data-start="1343" data-end="1520">
Boeing already has the 777X, which is basically a modern “twin-engine replacement” for the 747 on many routes — same payload range in many cases, but far more efficient.
</li>
</ul>
<h3 data-start="1522" data-end="1543">5. Regulatory</h3>
<ul data-start="1544" data-end="1823">
<li data-start="1544" data-end="1690">
FAA/EASA certification for a re-engined 747 with only two engines would be treated as an entirely new aircraft type, not just a “variant.”
</li>
<li data-start="1691" data-end="1823">
That means years of testing and costs in the billions — not practical for an aircraft family Boeing already ended production on.
</li>
</ul>
<hr data-start="1825" data-end="1828" />
✅ Bottom line: Boeing can’t just bolt two GE90s or GEnx engines onto a 747 to keep it alive. The economics, engineering, and certification hurdles are too great. That’s why Boeing transitioned to aircraft like the 777X and 787 — they were designed from the ground up as efficient twin-engine jets.</blockquote>

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