X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 01 Apr 2010 13:25:45 -0400 Message-ID: X-Original-Return-Path: Received: from smtp-auth-04.mx.pitdc1.expedient.net ([206.210.66.137] verified) by logan.com (CommuniGate Pro SMTP 5.3.5) with ESMTPS id 4192077 for lml@lancaironline.net; Thu, 01 Apr 2010 12:07:48 -0400 Received-SPF: none receiver=logan.com; client-ip=206.210.66.137; envelope-from=rpastusek@htii.com Received: from HTBOB001 (static-72-66-86-7.washdc.fios.verizon.net [72.66.86.7]) by smtp-auth-04.mx.pitdc1.expedient.net (Postfix) with ESMTPSA id 4DC36E55BF for ; Thu, 1 Apr 2010 12:07:14 -0400 (EDT) From: "Robert Pastusek" X-Original-To: "'Lancair Mailing List'" References: In-Reply-To: Subject: RE: [LML] AC drain line 4P X-Original-Date: Thu, 1 Apr 2010 12:07:13 -0400 X-Original-Message-ID: <029301cad1b5$64c68ce0$2e53a6a0$@com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0294_01CAD193.DDB4ECE0" X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: AcrRo+qkMh5WI3bLQHWggyTvsVBSbwADwxyw Content-Language: en-us This is a multi-part message in MIME format. ------=_NextPart_000_0294_01CAD193.DDB4ECE0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Ralf, =20 Interesting observations/questions=85 I went through the same questions/thought processes. I used a larger reservoir for the water collector=85an old peanut butter jar to be exact. You=92ll collect water = in the a/c evaporator at low altitudes/on the ground, but little, if any above 15,000=92=85the air is relatively dry and cool up there, so the capacity = needs to account for ground and expected low-altitude ops. My PB jar fills up = in about half an hour in damp ops at low altitude. Like you, I found that = a nylon fitting, used as a seal, allowed a small amount of leakage=85water = or air. The air leak has not bothered the pressurization system, and it = helps keep the reservoir empty. Give this a try. =20 You can get some surface tension blockage with a 1/4=94 line. Two considerations. The cabin pressure is normally higher than = ambient/outside, so you=92ll normally have just a small amount of air flow through the = drain line, helping the water flow. Also, a drop of liquid soap in the = evaporator collection tray breaks the surface tension and allows the water to flow freely. (It also cleans the line=85 J ).=20 =20 Last point: During normal operation, the pressurized cabin puts a pretty good =93seating=94 load on the float ball. Mine is smaller than = Jeff=92s; probably about the same size as yours (?...hard to tell from the picture). This = is fine, as the reservoir holds the collected water until you land/depressurize. I found, however, that the float ball would sometimes stick and not drain the water after the cabin was de-pressurized. A = sharp tap or puff on the drain line exit causes it to open and drain as = intended. =20 I installed my condensation collector/valve assembly in the back of the cabin pressure controller cavity=85in the rear seat bottom=85 and = drained it through a short piece of hose through the bottom of the fuselage. I = would not just dump the water in the lower fuselage=85there is more than = you=92d think, and the water will cause corrosion and other problems over = time=85 =20 My two cents=85 Bob P =20 Dear Subscribers, =20 My AC condenser in the cabin has a port (straight tube approx 3/8=94 = diameter) for water that condenses around the cold unit.=20 =20 I want to get this water outside my pressured cabin. During the LOBO maintenance workshop last year I took a picture of Jeff=92s old plane of = how he solved the problem (picture 274). =20 With parts that I found from MCMASTER CARR (best source ever for most of = the parts with industrial quality you need to build anything) I created the assembly that you can see on picture 212. I have doubts about my = dimensions now. My tube is 7/8=94 inside diameter. The ball is 0.787=94 diameter. = The ball can make about 3=94 stroke inside. The fittings are the one used for the static port line (1/4=94 outside diameter line). When I use a nylon nut = on the inside of the tube to secure the fitting I still hear a little air = escaping when blowing in. When I use an aluminum nut the ball seals the unit completely. =20 I got concerns now that - my reservoir 7/8=94 diameter x 3=94 lengths is not enough for the = amount of water produced by the AC condenser - the =BC=94 outside diameter of the nylon is not big enough to let the = water run down freely inside the line (it might get stuck like in a drinking straw????) - that when the unit seals up completely (with the aluminum nut) the = water will not get to my reservoir when using the =BC=94 outside diameter = nylon tubing =20 Any ideas would be appreciated=20 =20 Thanks =20 Ralf =20 =20 ------=_NextPart_000_0294_01CAD193.DDB4ECE0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Ralf,

 

Interesting observations/questions… I went through = the same questions/thought processes. I used a larger reservoir for the = water collector…an old peanut butter jar to be exact. You’ll = collect water in the a/c evaporator at low altitudes/on the ground, but little, = if any above 15,000’…the air is relatively dry and cool up there, = so the capacity needs to account for ground and expected low-altitude ops. My = PB jar fills up in about half an hour in damp ops at low altitude.=A0 Like you, = I found that a nylon fitting, used as a seal, allowed a small amount of = leakage…water or air. The air leak has not bothered the pressurization system, and it = helps keep the reservoir empty. Give this a try.

 

You can get some surface tension blockage with a = 1/4” line. Two considerations. The cabin pressure is normally higher than = ambient/outside, so you’ll normally have just a small amount of air flow through = the drain line, helping the water flow. Also, a drop of liquid soap in the = evaporator collection tray breaks the surface tension and allows the water to flow = freely. (It also cleans the line… J ). =

 

Last point: During normal operation, the pressurized = cabin puts a pretty good “seating” load on the float ball. Mine is = smaller than Jeff’s; probably about the same size as yours (?...hard to = tell from the picture). This is fine, as the reservoir holds the collected water = until you land/depressurize. I found, however, that the float ball would = sometimes stick and not drain the water after the cabin was de-pressurized. A = sharp tap or puff on the drain line exit causes it to open and drain as = intended.

 

I =A0installed my condensation collector/valve assembly = in the back of the cabin pressure controller cavity…in the rear seat = bottom… and drained it through a short piece of hose through the bottom of the fuselage. I would not just dump the water in the lower = fuselage…there is more than you’d think, and the water will cause corrosion and = other problems over time…

 

My two cents…


Bob P<= /span>

 

Dear Subscribers,

 

My AC condenser in the cabin has a port (straight tube approx 3/8” = diameter) for water that condenses around the cold unit.

 

I want to get this water outside my pressured cabin. During the LOBO = maintenance workshop last year I took a picture of Jeff’s old plane of how he = solved the problem (picture 274).

 

With parts that I found from MCMASTER CARR (best source ever for most of the = parts with industrial quality you need to build anything) I created the = assembly that you can see on picture 212. I have doubts about my dimensions now. My = tube is 7/8” inside diameter. The ball is 0.787” diameter. The ball = can make about 3” stroke inside. The fittings are the one used for the = static port line (1/4” outside diameter line). When I use a nylon nut on = the inside of the tube to secure the fitting I still hear a little air = escaping when blowing in. When I use an aluminum nut the ball seals the unit = completely.

 

I got concerns now that

- my reservoir 7/8” diameter x 3” lengths is not enough for = the amount of water produced by the AC condenser

- the =BC” outside diameter of the nylon is not big enough to let = the water run down freely inside the line (it might get stuck like in a drinking straw????)

- that when the unit seals up completely (with the aluminum nut) the water = will not get to my reservoir when using the =BC” outside diameter nylon = tubing

 

Any ideas would be appreciated

 

Thanks

 

Ralf

 

 

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