[PSUBS-MAILIST] U joint prop

[Alan James via Personal_Submersibles]

Hi Brian,are the motors near the middle of the sub?You will be able to turn a lot easier if they are.You could always make a scale model & push it at the point of the motor placement & see how easily it turns.Alan
      From: Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Tuesday, December 9, 2014 7:18 AM
 Subject: Re: [PSUBS-MAILIST] U joint prop
   
No, I'm running shafts back along each bottom sides of the sphere.  I found an area between the body of my ballast structure and the sphere where there is space to tuck in the motors nicely and still keep everything with in the profile.  I still may put some rudders on if I can't turn the thing.

Brian  

--- personal_submersibles at psubs.org wrote:

From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] U joint prop
Date: Mon, 8 Dec 2014 08:09:44 -0800

Brian,
If your motors are in cans, can't you turn the can?
Hank
--------------------------------------------
On Mon, 12/8/14, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] U joint prop
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Received: Monday, December 8, 2014, 10:03 AM
 
 That's probably the reason I've never
 seen one.  I'm hoping that with two props I'll be able
 to turn by just running one prop or the other.  
 
 Brian
 
 --- personal_submersibles at psubs.org
 wrote:
 
 From: Marc de Piolenc via Personal_Submersibles <personal_submersibles at psubs.org>
 To: personal_submersibles at psubs.org
 Subject: Re: [PSUBS-MAILIST] U joint prop
 Date: Mon, 08 Dec 2014 10:11:37 +0800
 
 One U-joint causes a 1/rev vibration which can be quite
 severe. To get 
 smooth action, you need a pair of U-joints, and the input
 and output 
 shafts need to be parallel.
 
 That, or you need to substitute a constant-velocity joint
 for the U-joint.
 
 Marc
 
 On 12/8/2014 9:11 AM, Brian Cox via Personal_Submersibles
 wrote:
 >      Has anyone ever had any experience
 or seen a propeller that can
 > change orientation using a U joint at the end of the
 propeller shaft?
 > If could just get 15 degrees or so I might be able to
 eliminate my
 > rudder assembly altogether.
 > Brian
 >
 >
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 >
 
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