Drysuit Dryer - Pics

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RJP

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The issue of how to dry a drysuit comes up often, and there are various approaches that are recommended. Everything from hanging, turning inside out, commercially made hangers (some with fans) to electric boot dryers rigged to take on a full drysuit.

Other folks prefer to take on the challenge themselves with a Home Depot credit card, a box saw, and a half-hour of spare time!

Here's my version of a home-made Drysuit Dryer. (I made it three years ago, but just decided to snap some pictures today.) Total cost: about $20 for PVC pipe, a DC fan, and a 12v adapter...

DSD-3.jpg


Everything is glued except for the two long "leg" pieces, which simply pop in/out of place. This makes putting the suit on the dryer quite easy as you can simply slide these two pieces into the suit and then mount the suit onto the rest of the dryer.

The fan is a DC brushless* "high flow" type from Radio Shack, coupled to a 12v DC adapter, attached to the "open" end of one of the feet of the dryer:

DSD-1.jpg


The fan is set to blow IN to the dryer. With the entire unit sealed, the only way for the air to move is up into the feet and out through the holes drilled into the ends of the leg pieces:

DSD-2.jpg


The air then travels down the legs, torso, and out through the open zipper carrying moisture out of the suit.

The fan is nearly silent, but moves a surprising amount of air. I set it up "blowing in" instead of "sucking out" to avoid pulling moist air through the fan. The front parts of the base are a bit longer than needed, as I over-estimated the potential for the thing to tip with a suit on it. The base is heavy enough to prevent tipping without the need for the added length.

I find that this dryer will dry my DUI TLS-350 Trilam drysuit overnight, even if it's completely wet from a good rinsing. (Which I do pretty often since it's so easy to dry it now!)

* It's important to use a DC motor, ideally brushless, to avoid creation of ozone which will do a number on your suit's seals. AC fans and/or heat are to be avoided for sure!
 
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The issue of how to dry a drysuit comes up often, and there are various approaches that are recommended. Everything from hanging, turning inside out, commercially made hangers (some with fans) to electric boot dryers rigged to take on a full drysuit.

Other folks prefer to take on the challenge themselves with a Home Depot credit card, a box saw, and a half-hour of spare time!

Here's my version of a home-made Drysuit Dryer. (I made it three years ago, but just decided to snap some pictures today.) Total cost: about $20 for PVC pipe, a DC fan, and a 12v adapter...

DSD-3.jpg


Everything is glued except for the two long "leg" pieces, which simply pop in/out of place. This makes putting the suit on the dryer quite easy as you can simply slide these two pieces into the suit and then mount the suit onto the rest of the dryer.

The fan is a DC brushless* "high flow" type from Radio Shack, coupled to a 12v DC adapter, attached to the "open" end of one of the feet of the dryer:

DSD-1.jpg


The fan is set to blow IN to the dryer. With the entire unit sealed, the only way for the air to move is up into the feet and out through the holes drilled into the ends of the leg pieces:

DSD-2.jpg


The air then travels down the legs, torso, and out through the open zipper carrying moisture out of the suit.

The fan is nearly silent, but moves a surprising amount of air. I set it up "blowing in" instead of "sucking out" to avoid pulling moist air through the fan. The front parts of the base are a bit longer than needed, as I over-estimated the potential for the thing to tip with a suit on it. The base is heavy enough to prevent tipping without the need for the added length.

I find that this dryer will dry my DUI TLS-350 Trilam drysuit overnight, even if it's completely wet from a good rinsing. (Which I do pretty often since it's so easy to dry it now!)

* It's important to use a DC motor, ideally brushless, to avoid creation of ozone which will do a number on your suit's seals. AC fans and/or heat are to be avoided for sure!

Looks good but........


Am improved design would use two fans. With low pressure air it's almost certain that the flow won't "split" evenly and flow out each of the two perforated elbows.

Any blockage will cause all the air to flow out one side.

If you note the original "Dalton" style dryer used a dual squirrel cage blower, i.e. one motor with a blower on each end.

I'd add another fan, and block the center cross over.

Regarding motors: The thing to avoid is brushed motors. There are motors that can run on AC or DC called "universal motors" that use brushes, think skillsaw or plug in drill motor. These are great O3 generators, but Universal Motors are seldom used for fans. If you can see sparks you are making O3.

AC Induction motors don't generate O3, and most AC "pancake" type cooling fans are split cap Induction motors.



Tobin
 
Looks good but........

An improved design would use two fans. With low pressure air it's almost certain that the flow won't "split" evenly and flow out each of the two perforated elbows.

Any blockage will cause all the air to flow out one side.

I'd add another fan, and block the center cross over.

In theory your recommendation seems well founded. However three years of actual use of the dryer tells me that's not needed...

:eyebrow:

  • air does seem to flow pretty evenly through the two elbows (though not measured objectively) as would be expected in a closed system of substantially equal length of the two "legs"
  • in practical application it's near impossible for a "blockage" to occur given the number/placement of holes on the ends
  • if a blockage DID occur on one side, it would still block flow from a "separate" fan on that side anyway (given type of fan) so having a separate fan on that side wouldn't help

Perhaps if I needed to dry a suit much faster a second fan would be useful from a simple CFM standpoint...but since I never need my suit dry any faster than "by tomorrow morning" I can't see modifying the design.

Again, long story short, the thing works.
 
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In theory your recommendation seems well founded. However three years of actual use of the dryer tells me that's not needed...

  • air does seem to flow pretty evenly through the two elbows (though not measured objectively) as would be expected in a closed system of substantially equal length of the two "legs"
  • in practical application it's near impossible for a "blockage" to occur given the number/placement of holes on the ends
  • if a blockage DID occur on one side, it would still block flow from a "separate" fan on that side anyway (given type of fan) so having a separate fan on that side wouldn't help

Perhaps if I needed to dry a suit much faster a second fan would be useful from a simple CFM standpoint...but since I never need my suit dry any faster than "by tomorrow morning" I can't see modifying the design.

Again, long story short, the thing works.

Glad to hear it works.

I added my comments for the benefit of others contemplating building a similar device who may not be aware of potential problems.

Bladed fans produce low pressure, high volume flow. If such a fan is used to deliver air to multiple outlets it's really easy to block the flow from *one* outlet and have 100% of the flow use the other outlets.

OTOH if a fan has only one outlet blocking the flow will cause a pressure rise that will tend to "blow" the blockage aside.

The solutions to this problem include over sizing the single fan, or using dual fans, each driving a single outlet.

Tobin
 
Glad to hear it works.

I added my comments for the benefit of others contemplating building a similar device who may not be aware of potential problems.

Understood, and appreciated.

I bought everything as an "impulse buy" when I was at Home Depot for something else, coming up with the design on-the-fly in the plumbing aisle!
 
How long does it take to dry your suit with the dryer? Can you tell me what type of dry suit you are drying with it? I'm trying to decide if I should build one compared to the method I use today.

Thanks, Jeff
 
Here's my version of a home-made Drysuit Dryer. (I made it three years ago, but just decided to snap some pictures today.) Total cost: about $20 for PVC pipe, a DC fan, and a 12v adapter...
!

Better patent that, quick! Awesome design.
 
Nice job, thanks for sharing.
 
Understood, and appreciated.

I bought everything as an "impulse buy" when I was at Home Depot for something else, coming up with the design on-the-fly in the plumbing aisle!

If you got the job done in one trip with nothing left over you are doing better than I usually do...:wink:

Tobin
 
https://www.shearwater.com/products/teric/

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