[PSUBS-MAILIST] Gamma's diesel engine

[hank pronk via Personal_Submersibles]

Hi Greg,Thank you for the input.  That is good to know that the captain liked the diesel model.  I have been torn over the idea, but since I have an actual engine room with insulated door, it should be fine.  My 6 hp motor sounds small now, I can get a bigger one.  My problem is it has to fit through a 18 in dia opening with ease so the escape pod can still be an escape pod.  Gamma had a 2 hp electric originally with the prop in the centre of the height.  I figure the 6 hp diesel should be double that and spin the prop twice the speed.  I will take the transmission advice, I have one so no problem there.Hank

On Friday, August 11, 2017, 6:31:48 AM MDT, james cottrell via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

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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