[PSUBS-MAILIST] Vertical thrusters

[hank pronk via Personal_Submersibles]

 David, that looks nice-the thruster poking through won't be noticeable when the hole is full size.  Hank
    On Sunday, July 5, 2020, 11:26:27 PM MDT, 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 areato get a bit of the kort nozzle effect & for visual streamlined look as it willprotrude more with a proppeller guard on it.You will get some power loss with the wash hitting the sides of the horizontalTunnel, but maybe you could make the uncut hole much larger to eliminatea 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 feedbackDavid_______________________________________________
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