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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