[PSUBS-MAILIST] Gamma's diesel engine

[james cottrell via Personal_Submersibles]

Hank,
Captain Kittredge built three diesel subs and liked them very much. He used 7-8 hp yanmar diesels with a transmission. He highly recommended using a transmission and considered reverse a necessity. Exhaust existed at the bottom of the hull just behind a makeshift "skeg" that created cavitation (vacuum to reduce back pressure). 
The prop should be below center on a sub due to the low center of gravity. If you place a powerful prop as high up as the middle it will lift the stern.

Greg C

      From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Thursday, August 10, 2017 5:14 PM
 Subject: [PSUBS-MAILIST] Gamma's diesel engine
   
Hi All,I have just purchased a 6 hp diesel for Gamma.  The plan is to use the original prop assembly that can jettison.  The only thing I am not sure of is will I have cavitation problems.  The prop will be about 12 inches from the occupant sphere, mounted in the centre of the sphere (equator)  Will I have to put a spacer between the sphere and prop assembly to move it further away?Hank

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