Saturday, January 24, 2015
Design 1740 Double Eagle
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjVcpD5G3o-yh93ZkfzqctaOydM8xuPa4YveG4_jmUntb1bBTgCIThcZFboKtxQZfYvXVZ3_r3v1HYreeN7coV7cuNR9WV53Cnh0p7vrHzjJflPJceRz6hyGQzLXXQ_SSPAWMmoXZcILA6M/s400/1740+Double+Eagle.jpg)
Heres an interesting design shrouded in secrecy. From the files I can see the client is listed as the "sponsor" but that only leads me to believe it was the U.S. Navy. The design brief was for a 79 high speed "crew" boat utilizing twin diesel engines for cruise speed and twin gas turbines turning super cavitating props for boost speed of over 50 knots in sea state 3.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgPws83EBymQlMYuCr30ylhCIWsTFoRCpdckxjM4YkbNqB9sKGO_iWwb7xMW8m_iu7jDhQYG5BCujx_DiItmWC0Ke9YE4Pt7O_kURdt6x7aQ8VEO1y2hRQfam1kvngrOPPJPESpQwpMNsvF/s400/1740-C2+Outboard+Profile.jpg)
The boat was built by General Dynamics of aluminum. The year was 1966, pretty early for a gas turbine powered boat and I would not be surprised if it was not the earliest.
Heres a construction sequence.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhomtNZLWREcv4FzmetufeKUR8p2eIODct9_XRrQMgA5pPInhN1JIfykLLmgcjYc3BWmVn3RmUtV9qZ6C6FGbFsu1QyUkNRNBeoMNso_FANda2QoOe7rDqVqyzvEbVo_6RRgKzF7EUDVJWv/s400/photo5.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhdMt26_i4YYwQ5q-mhO95CG6HXSEVyDPbMDaW3jYHgQdToPeLIF0G1PGjMhcB3wpiSHrRE9cPAe1zU-Bs81mrKXDy-HiU4UGtUFOBSiiD6Gdmio49dELo2aulVfdCQ9MFKnJWnRnHC5kTT/s400/photo6.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgA7VWK-Aet4IFeYC1KPDRdhms28MyWFj7iYQl07RbG07cDOsKwAyV-j7yHvjxFp_-rK5O1_IQpzna1aJYCdvv-ehVzwfrOflKr5ehFBNP1oJosTeGfBqCCPAPmcu272IxGkv1lcJ5rhb4q/s400/photo7.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgupTpMzycfVT48WNVNMrjgU-gnAI0Q4kmFyML2r7DxHLHaxAfqJ56pArvlY5xWywcGzd_JeajXBKYt3VVvtlIsuA487GVnUBnrIRUaNydY6vCgI6BYkS8JPUpRTaZyes4M6NFDXBnfLkLH/s400/photo4.jpg)
Heres the boat at speed. The boat achieved 57 knots during sea trials.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiXXXO2yv55YsJy8OXbFu852iV_SQsOBbpf6TsWlzW00XSIFZplyAE8WdQ3h_3jznPGWtLBZoW5LPQPyN1kmDmAHSljU3z9my6k5mrBtc8L3D2CLvXlKaRG-jMyo9lR3VTrzQm28VoYHFdI/s400/photo2.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgsHmhyphenhyphenP4TD5NaHiMrHr36MiCD9ivbLJL2k4tC5wnGAypjF6suj5ltXyY_Zk1Qik4O0PEMFa8XExXlIzKoV4kM4JCvhzDL2Ve_cyK6hBTwP-fpq5yEY-43_jo_1UZ4FvvBHWRfBKplnAx1p/s400/photo1.jpg)
A detail shot of the bridge.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiMlV2zAkl49ztPRTepKQ9Na7ghOusbxCXu7NU9prIMoZyMsvHoIjZoW-_Vke93j6e12zGPaa5tclavCu6JYbGxdcXC8ifEAYU0cCEcgjWzsOVEhorxbBqCSMw5fwUXTG6UtQXtCAckpUlU/s400/photo8.jpg)
Note the small segmented windshield. In reviewing the engineering report it was felt that windows of this (small) size were needed to withstand wave impact at speed.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEji9I8oJueL2cEjrDWdjexUsCIbv4bJW3UELkbm_pLTuWqlKfqnu767JuoASnnWOuEVKHfFxHfvCy8h8goy1gK2Q-LPgiwxLe2lfwxthxYoqsCCT9iV6YCESp25Qjw4BgiuMTxLiQacVHTw/s400/photo9.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEikYFnlaA_FTmmFOZ1eVosDgzsO5JXwzL7aLd9ezFVsrGXnVEo5XJCPK9sw-mKFO0hDcma9-NmZ9ZiV_8tN7HgcaHBwP3qzwu5K-HhZhx4cIVC44_SWsg8sG02w4fcAESwoF1beZtJBuQOQ/s400/photo10.jpg)
Heres a shot of the out drives. The outboard drives are very early Schottel drives. Were using Schottel drives on a boat we are building now. You can see the super cavitating props on the inner shafts.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh6EDjM45rBF4-j0e2Uj9EHT97pEr61sH18NjbFXaBqKymi_brWamhyphenhyphenkR5rxLam9THLyGktNrXSgTiKeWX6zLDi812nDJm212UwUFQVbzL0aC7GnetPs8d9UbBYdWYuk8WVkP_7oEqj5O4O/s400/photo11.jpg)
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