Return-Path: Received: from corpprd-pxy2.canfor.ca ([198.162.160.3] verified) by logan.com (CommuniGate Pro SMTP 4.2b8) with ESMTP id 332099 for flyrotary@lancaironline.net; Fri, 23 Jul 2004 15:11:31 -0400 Received-SPF: error receiver=logan.com; client-ip=198.162.160.3; envelope-from=Steve.Bartrim@canfor.com Received: from canformail1.canfor.ca (canformail1.canfor.ca [199.60.193.29]) by corpprd-pxy2.canfor.ca (Build 103 8.9.3p2/NT-8.9.3) with ESMTP id MAA02995 for ; Fri, 23 Jul 2004 12:11:00 -0700 X-MimeOLE: Produced By Microsoft Exchange V6.5.7226.0 Content-class: urn:content-classes:message Subject: RE: [FlyRotary] Re: Absolute pressure boost controller Date: Fri, 23 Jul 2004 12:10:52 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C470E8.C59B2820" Message-ID: <1F17B59A61D4194095359264D24D22A2708CB0@mailman.canfor.ca> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [FlyRotary] Re: Absolute pressure boost controller Thread-Index: AcRwsimF7DkEVlXzTY2r8UNV+jxWRQA/dX8g From: "Bartrim, Todd" To: "Rotary motors in aircraft" This is a multi-part message in MIME format. ------_=_NextPart_001_01C470E8.C59B2820 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable > Todd, do you still have the link to this actuator? > =20 > Thanks, > Dave Leonard >=20 Hi Dave; I'm not sure which link you are looking for? If you are referring to = the e-boost controller that I just ordered, then it can be found at = www.turbosmart.com.au , however it is not an actuator, but rather a = controlled bleed solenoid that is installed in the sensing line to the = actuator (you probably already know this), If you are referring to the simple absolute pressure actuator that I = desired then it is a mythical creature that I've never found, but it is = so simple that I'm surprised I can't find one. I've thought about = building one, but without a vacuum chamber to assemble and weld it, it = would be very difficult. My idea would be to use an actuator with the = top of the diaphragm containing a perfect (or close to) vacuum and a 16 = pound spring. The bottom of the diaphragm would be connected to the MAP = sensing line. Then the actuator would always try to balance the MAP = against the spring pressure only regardless of atmospheric pressure. = This will cause the actuator to always try to maintain 32.5" MAP (during = wide open throttle), regardless of altitude... very simple and = effective. Unfortunately I can't find one. Auto applications don't = desire this feature and aircraft turbos are so ridiculously priced that = it's not even worth looking at. Building one would seem simple enough, = however as I only have a vacuum pump I would need to install a valve on = the vacuum side of the diaphragm to apply the vacuum, then close the = valve, disconnect the pump and install a plug in the valve. Eventually = the valve stem packing would leak, so full vacuum would have to be = reapplied periodically. The ability to assemble this inside a vacuum = chamber would eliminate this issue. The MAP side of the diaphragm would = also require a packing box on the shaft seal. These issues could easily = be overcome at a production scale, but for a one off it would be a = challenge indeed. So unless I can find a source for an off-the-shelf actuator, I pinning = my hopes on the E-Boost.=20 (Probably much more than you wanted to know :-) S. Todd Bartrim (still waiting for the kid) Turbo 13B RX-9endurance C-FSTB http://www3.telus.net/haywire/RV-9/C-FSTB.htm "Imagination is more important than knowledge" -Albert Einstein ------_=_NextPart_001_01C470E8.C59B2820 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable RE: [FlyRotary] Re: Absolute pressure boost controller

    Todd, do you still have the link to this = actuator?
     
    Thanks,

Dave Leonard

Hi = Dave;
        = I'm not sure which link you are looking = for? If you are referring to the e-boost controller that I just ordered, = then it can be found at www.turbosmart.com.au , however it is not an actuator, but rather a controlled = bleed solenoid that is installed in the sensing line to the actuator = (you probably already know this),

        If you are referring to the simple absolute = pressure actuator that I desired then it is a mythical creature that = I've never found, but it is so simple that I'm surprised I can't find = one. I've thought about building one, but without a vacuum chamber to = assemble and weld it, it would be very difficult. My idea would be to = use an actuator with the top of the diaphragm containing a perfect (or = close to) vacuum and a 16 pound spring. The bottom of the diaphragm = would be connected to the MAP sensing line. Then the actuator would = always try to balance the MAP against the spring pressure only = regardless of atmospheric pressure. This will cause the actuator to = always try to maintain 32.5" MAP (during wide open throttle), = regardless of altitude... very simple and effective. Unfortunately I = can't find one. Auto applications don't desire this feature and aircraft = turbos are so ridiculously priced that it's not even worth looking at. = Building one would seem simple enough, however as I only have a vacuum = pump I would need to install a valve on the vacuum side of the diaphragm = to apply the vacuum, then close the valve, disconnect the pump and = install a plug in the valve. Eventually the valve stem packing would = leak, so full vacuum would have to be reapplied periodically. The = ability to assemble this inside a vacuum chamber would eliminate this = issue. The MAP side of the diaphragm  would also require a packing = box on the shaft seal. These issues could easily be overcome at a = production scale, but for a one off it would be a challenge = indeed.

        So unless I can find a source for an = off-the-shelf actuator, I pinning my hopes on the E-Boost. =

(Probably much = more than you wanted to know :-)

S. Todd Bartrim = (still waiting for the kid)
Turbo = 13B
RX-9endurance
C-FSTB
http://www3.telus.= net/haywire/RV-9/C-FSTB.htm

        "Imagination is more important than = knowledge"
        =         =         =         =         -Albert Einstein


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