[PSUBS-MAILIST] U joint prop

[Stephen Fordyce via Personal_Submersibles]

Hi Brian,
>From my experience driving my dive club's (2t) boat with twin engines,
using them to steer is not very effective at all. And thinking about it, to
turn, the stern needs to have a sideways force on it, which is only very
marginal from a straight drive shaft, i.e. imagine holding even a small
boat at the stern in the water and and trying to pivot it around the stern.
Much harder than trying to push the stern sideways to turn it.

Cheers,
Steve
On 09/12/2014 8:25 AM, "Brian Cox via Personal_Submersibles" <
personal_submersibles at psubs.org> wrote:

> Hi Alan,
>                 I do have a model, but the sub has evolved a bit from when
> I made the model.  At this point I'm basically committed to my design and
> I'll have to work with what I have.  It's all good, can't wait to play with
> it, my welder did another viewport flange yesterday, and I have another guy
> finishing up the conning tower..
>
> Brian
>
> --- personal_submersibles at psubs.org wrote:
>
> From: Alan James 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 19:04:52 +0000 (UTC)
>
> 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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