[PSUBS-MAILIST] Vertical thrusters

[David Colombo via Personal_Submersibles]

Alan, you just reminded me about a company called McNicols. I had bought
floor grating from them in the past. They have a huge selection.
David

On Sun, Jul 5, 2020, 10:48 PM Alan via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> David,
> What about a plastic grate!
> I have seen a few of those around on submarine thrusters. ( well they look
> plastic)
> Alan
>
> On 6/07/2020, at 5:25 PM, David Colombo via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Hi guys, i completed the placement on my vertical thruster. Tomorrow I
> will need sending to the cnc to cut the support arm for each of the 4
> horizontal thrusters. Turns out the thruster just peaks out the bottom. My
> temporary grill is a bbq grate. If it was only stainless steel.
> David.
>
>
>
> On Sat, Jul 4, 2020, 11:56 PM David Colombo <seaquestor at gmail.com> wrote:
>
>> Hi Alan, Im thinking the same thing. The collar should be 2-3 long below
>> the flush grill with the top of the wing. Aesthetically I think the flush
>> grill will look better.
>> David
>>
>> On Sat, Jul 4, 2020, 1:33 PM Alan via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>>> David,
>>> I would put it down lower so you have more propeller in the collar area
>>> to get a bit of the kort nozzle effect & for visual streamlined look as
>>> it will
>>> protrude more with a proppeller guard on it.
>>> You will get some power loss with the wash hitting the sides of the
>>> horizontal
>>> Tunnel, but maybe you could make the uncut hole much larger to eliminate
>>> a bit of that effect.
>>> Alan
>>>
>>> On 5/07/2020, at 7:55 AM, David Colombo via Personal_Submersibles <
>>> personal_submersibles at psubs.org> wrote:
>>>
>>> Hi Alec, the 12" hole will be in the bottom as well. I just hadn't cut
>>> it out yet.  I'm thinking that that the prop will sit just below the grill
>>> which will be flush with the surface. Even with that placement the nose of
>>> the thruster may just peek out the bottom just a bit, so entanglement
>>> issues.
>>> David
>>>
>>> On Sat, Jul 4, 2020, 12:00 PM Alec Smyth via Personal_Submersibles <
>>> personal_submersibles at psubs.org> wrote:
>>>
>>>> Hi Dave,
>>>>
>>>> Looking good! Surely there is a 11" diameter hole coming in the bottom
>>>> of that tunnel? You wouldn't want to draw water in horizontally and expel
>>>> it vertically - you'd want it to come in directly from the bottom and go
>>>> out the top. And once you had that hole, the thruster maybe could also go a
>>>> little lower, so that the prop was just below grade on the top skin. But
>>>> the latter suggestion seems to me much less important than the first.
>>>>
>>>> Best,
>>>> Alec
>>>>
>>>> On Sat, Jul 4, 2020 at 1:47 PM David Colombo via Personal_Submersibles <
>>>> personal_submersibles at psubs.org> wrote:
>>>>
>>>>> Ok guys, looking for comments on potential issues with vertical
>>>>> thrusters. This morning I laid in the first vert thruster in the wing to
>>>>> mock up the attaching bracket to the hull. The twelve inch hole will go
>>>>> thru the wing. The questions are:
>>>>> 1) hold the prop flush with top surface or raised  slightly. I will be
>>>>> fabbing a grill cover.
>>>>> 2) as the prop can draw water from the bottom as well as thru the
>>>>> thruster tube, any concerns with prop wash being pushed out more laterally
>>>>> vs vertically. Wondering if i need to have a collar at least as deep as the
>>>>> prop?
>>>>>  You might be also wondering why I have 101 lb vertical thrusters.
>>>>> Never know when you might need to do a barrel roll maneuver.
>>>>> I appreciate the feedback
>>>>> David
>>>>> _______________________________________________
>>>>> Personal_Submersibles mailing list
>>>>> Personal_Submersibles at psubs.org
>>>>> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>>>>>
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>> <Image1734396640006399190.jpg>
>
> <Image3849518237505684318.jpg>
>
> <Image7387846232491955686.jpg>
>
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