ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

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Jaysen
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Re: ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

Post by Jaysen » Thu Mar 23, 2017 6:48 am

Those will be perfect. Just make sure the air flows thru the fins and not against. You'd be amazed how many times I've seen folks block an airway by putting the heatsink 90deg off.

You're going to love this once it's done.



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glossieblack
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Re: ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

Post by glossieblack » Thu Mar 23, 2017 7:16 pm

Jaysen wrote:
Thu Mar 23, 2017 6:48 am
Those will be perfect. Just make sure the air flows thru the fins and not against. You'd be amazed how many times I've seen folks block an airway by putting the heatsink 90deg off.
Thanks for the heads up. I hadn't considered fin orientation. I was going to construct the box around the fins big enough for air to flow around the external perimeter the block of fins. Is your inclination to restrict the forced air path to between individual fins only?
Completed R13 two part nesting rowboat. ST 21 under construction .... where seeking perfection is recognized as the enemy of the good.

Jaysen
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Re: ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

Post by Jaysen » Thu Mar 23, 2017 8:13 pm

You don't want to restrict airflow as much as keep air moving over the fins. If you have limited space (and what space on a boat isn't limited?) allow at least 1" clearance around the cooling fins. Once you see it like that you'll understand the fin alignment issue.

One thing to keep in mind, that smaller the cross section the faster the air flow will need to be. Remember that the incoming cool air start taking heat at the first surface which reduces its heat dissipation later in the sequence. You'll know you have they right air speed when the exhaust is just a tad warm. If the air is hot increase the speed.

My guess is that with those heat sinks you won't need to huge volume through there. I would make sure they your thermal compound is "thermal adhesive" as the traditional compound is not designed to keep things in place.

My solution for this is water cooling. I'll be using larger motor and components most of which have water cooling be default. I've toyed with making my own motor and controller to allow for better air cooling options. Not sure I'm that ambitious.

Skinnydip is definitely a unique build. Can't wait to see how she performs.

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glossieblack
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Re: ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

Post by glossieblack » Fri Mar 24, 2017 7:04 pm

I need to determine during sea trials the amounts of forced cool air that needs to be supplied to both the e-motor and the motor controller when the boat is being pushed hard on a hot day.

During the sea trials, I’ll be able to monitor the temperature of both components by going into the menu on the e-display pictured below, then mechanically adjust the forced air flow rates to achieve optimal settings for both the motor and controller.

Image
Completed R13 two part nesting rowboat. ST 21 under construction .... where seeking perfection is recognized as the enemy of the good.

TomW1
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Re: ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

Post by TomW1 » Sat Mar 25, 2017 1:32 am

Hi guy don't over think this. You have an electric motor with a wide range of operating specifications. Set up the air flow to provide enough for the hottest days and you will be fine for the rest of the days. There is no real need to get paranoid about it just provide a good air flow to it and you should be fine.
Restored Mirror Dinghy, Bought OD18 built by CL, Westlawn School of Yacht Design courses.

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peter-curacao
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Re: ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

Post by peter-curacao » Sat Mar 25, 2017 9:26 am

Hi Tom I don't know nothing about those electric motors, but as far as I know a hot day in the Smokey's and a hot day down under is a world of difference LOL :lol:
BTW I loved the Smokey mountains area, beautiful place 8)

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glossieblack
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Re: ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

Post by glossieblack » Sun Mar 26, 2017 3:19 am

I've spent a pleasant Sunday cleaning up the shed, measuring up and preparing a list of materials needed to construct the decks, and then visiting Bunnings to get what I still need.

I found myself thinking of Cracker Larry's words of wisdom and wit over the years, and hoping for his speedy recovery. :D
Completed R13 two part nesting rowboat. ST 21 under construction .... where seeking perfection is recognized as the enemy of the good.

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BarraMan
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Re: ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

Post by BarraMan » Sun Mar 26, 2017 4:22 am

Hey Michael, I had a pleasant Sunday getting ready to get beat up by cyclone Debbie!

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glossieblack
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Re: ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

Post by glossieblack » Sun Mar 26, 2017 4:32 am

Lee, do you rate Debbie as a greater threat than any of the ones since Yasi?
Completed R13 two part nesting rowboat. ST 21 under construction .... where seeking perfection is recognized as the enemy of the good.

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BarraMan
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Re: ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

Post by BarraMan » Sun Mar 26, 2017 4:43 am

glossieblack wrote:
Sun Mar 26, 2017 4:32 am
Lee, do you rate Debbie as a greater threat than any of the ones since Yasi?
Yes, Debbie is potentially right up there with Yasi! It's a BIG system and forecast to wind up to Cat 4, maybe Cat 5. Hopefully, it will cross the coast where there aren't too many people. :?
Last edited by BarraMan on Sun Mar 26, 2017 5:56 am, edited 1 time in total.

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