[PSUBS-MAILIST] T-Rex Thrusters & Cooling

[Joe Perkel]

Jon,
 
I was intigued by the condition of the motors on the K-600 after thier long entombment.  
 
So as a result, I'm currently studying his design as well as off-the-shelf examples while looking at ways to incorporate homebuilding with more modern materials and components.
 
Joe



On Wednesday, October 9, 2013 10:59 PM, Jon Wallace <jonw at psubs.org> wrote:
  

Never inquired about it with George.  My guess is it had as much
      to do with the overall design as anything else.  He used dog-ears
      at the open end to hold the motor which required a certain amount
      of material to support the 1/4 inch attachment bolts.  I suspect
      the can size was based upon convenience.


On 10/9/2013 8:48 PM, Joe Perkel wrote:
 
I am trying to understand George's design intent reference his 1 ATM SCH40 pipe housings and cooling. 
>
>Where #8 SCH40 O.D. being 8.625" and your typical 2-3 HP DC enclosed fan cooled motor being roughly 6", was it his intent to have this airspace between the motor and inner wall for air circulation, or is this space simply incidental? 
>
>I am wondering if these housings can be slimmed down to a more snug or custom fit with a reliance on conduction for cooling? Perhaps even filling the 1 ATM housing with non-compensated oil for the sole purpose of efficient conduction? 
>
>I am also noting that the bow thruster industry likes to get the motor out of the props way with a 90 degree drive arrangement. This has interesting implications for potentially more efficient and downsized lateral thrusters. 
>
>Some musings. 
>
>Joe 
> 
>      


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