X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from EXHUB003-3.exch003intermedia.net ([207.5.74.110] verified) by logan.com (CommuniGate Pro SMTP 5.2.12) with ESMTPS id 3474438 for flyrotary@lancaironline.net; Tue, 03 Feb 2009 12:25:17 -0500 Received-SPF: none receiver=logan.com; client-ip=207.5.74.110; envelope-from=jwhaley@datacast.com Received: from EXVMBX003-5.exch003intermedia.net ([207.5.74.45]) by EXHUB003-3.exch003intermedia.net ([207.5.74.110]) with mapi; Tue, 3 Feb 2009 09:24:40 -0800 From: Jeff Whaley To: Rotary motors in aircraft Date: Tue, 3 Feb 2009 09:24:38 -0800 Subject: RE: [FlyRotary] Pressure bottles/expansion tanks/makeup bottles/accumulators Thread-Topic: [FlyRotary] Pressure bottles/expansion tanks/makeup bottles/accumulators Thread-Index: AcmGHgMuGOY1+bHmRp6A8uF5BQ2bswABefoQ Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: multipart/alternative; boundary="_000_C03ABB0A7362B84BB53D544B3C305E0ED13860DDD6EXVMBX0035exc_" MIME-Version: 1.0 --_000_C03ABB0A7362B84BB53D544B3C305E0ED13860DDD6EXVMBX0035exc_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Thanks Lynn ... this is encouraging; my expansion tank does sit at about 25= % full and I've never seen any coolant expelled into the catch bottle. In the car, the pressure bottle is not filled full but is kept at about 25%= depth. This allows the bottle to act as an accumulator, like airplane accu= mulators. Like a spring if you like. So, should cap rating be exceeded, onl= y air will be expended, and not coolant. So, a temperature increase expand= s the coolant, and air pressure in the bottle will be at coolant pressure, = and when the pressure exceeds the cap value only air is expelled. --_000_C03ABB0A7362B84BB53D544B3C305E0ED13860DDD6EXVMBX0035exc_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Thanks Lynn … this is encouraging; my expansion tank d= oes sit at about 25% full and I’ve never seen any coolant expelled into the catc= h bottle.

In the car, the pressure bottle is not filled full but= is kept at about 25% depth. This allows the bottle to act as an accumulator, l= ike airplane accumulators. Like a spring if you like. So, should cap rating be exceeded, only air will be expended, and not coolant. So, a temperatu= re increase expands the coolant, and air pressure in the bottle will be at coolant pressure, and when the pressure exceeds the cap value only air is expelled.=

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