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Diy airtrap

Old 01-21-2019, 08:48 PM
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causeitflies
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Default Diy airtrap

I had some stuff laying around and thought I would show how to make an OAT (Oldschool Air Trap)






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dav.ie (10-14-2020)
Old 01-22-2019, 05:38 AM
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joeflyer
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Good show. I've been making my own UAT's for about 15 years now using pleated filters, at a cost of about $10 each. I am shocked at how much some people are charging for ready made ones these days.
Old 01-22-2019, 06:31 AM
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I made some for my twin one time, just like the MAP hi flow, easy to do. You can get those filters from most auto parts stores, not as flashy but you can always put a decal on the bottle for show lol
Old 01-23-2019, 06:52 AM
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is the pleated the best way to go or could i use a large felt clunk and not have to solder or glue the filter on..

an btw did you use hysol to attach the pleated filter........
Old 01-23-2019, 07:23 AM
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It would work, however I prefer pleated filters. Felt clunks are more loosely constructed and fibers tend to come off and might cause some issues.
Hysol will work fine. I used JB Weld. My oldest one is 14 years old (over 250 flights) and still working fine.

Joe

Last edited by joeflyer; 01-23-2019 at 07:28 AM.
Old 01-23-2019, 07:27 AM
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Originally Posted by joeflyer View Post
Good show. I've been making my own UAT's for about 15 years now using pleated filters, at a cost of about $10 each. I am shocked at how much some people are charging for ready made ones these days.
People are shocked when they see something DIY on a jet this days... :-)

This is a good thread, Using my du-bro central pickup header tanks for 20 years . zero problems, and zero maintenance on them.
Old 01-23-2019, 07:48 AM
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LGM Graphix
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I've never disagreed with the idea of a UAT but when I see them today at $100 I shake my head. Back in the ducted fan days we just called them header tanks and there was nothing more than a clunk. My CAI Raptor doesn't even have a header tank and honestly I have never had a flameout.
this thread is a great reminder of how simple it really is and how badly we get sucked into the expensive fancy jet crap that gets developed. We have UAT's with telemetry on them for crying out loud. I still use the oldschool methods myself. Good thread.
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Old 01-23-2019, 08:04 AM
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joeflyer
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"this thread is a great reminder of how simple it really is and how badly we get sucked into the expensive fancy jet crap that gets developed."

AMEN!
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Old 01-23-2019, 08:48 AM
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I am also a fan of DIY when I can. This is an excellent tutorial and one I will do in the future.

Thank you,

Jeff
Old 01-23-2019, 11:54 AM
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I’ve been really intrigued about making one with a sintered brass filter element.

Using hysol as the mating element on a big brass tubing is a VERY good idea!
Old 01-23-2019, 03:03 PM
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If I was thinking ahead I would buy some Nalgene bottles with the wide mouth along wth some vent and fill fittings. Using a regular tank and bung limits the size of the brass tubing. I also had to drill out the end caps. The tubing ID is 4mm the same as 6mm fuel tubing. The fill tube is smaller.

I prefer the pleated filters over all others but any of them would work. You could even put a sock over it if you prefer. This tank actually came from my old CARF Flash kit. I used something else in that plane. It came with a felt filter to use as a hopper tank. My Flash has felt filter/clunks in the tanks and I never had any issues with them.

I think telemetry in the air trap is a really great idea, but I feel really bad about paying $40 to $50 for one let alone what they want. So I'll have to figure out how to make a cheap one myself . I have a few MAP and a couple KingTech tanks so yes I get lazy sometimes too.

When I made my first tank, thirteen or fourteen years ago, I soldered the filter to the tubing. Doing this risks damaging the glue of the filter. That filter is still going strong and has been used alternately in two different planes.
I use these glues instead of Hysol.


Last edited by causeitflies; 01-23-2019 at 03:07 PM.
Old 01-23-2019, 03:44 PM
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I bought a bunch of 4 oz. nalgene bottles from US Plastics. They're the same as what is used for BVM UAT's. Also I've bought fittings from Tam in the past and from Bennett Built (sells giant scale accessories).
Old 10-14-2020, 06:58 AM
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Default Part Numbers?

Hi

DO you have a part number or other info on the pleated filter in those pics?

Thanks!
Old 10-14-2020, 07:22 AM
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Fram CG11


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