Return-Path: <13brv3@bellsouth.net> Received: from imf25aec.mail.bellsouth.net ([205.152.59.73] verified) by logan.com (CommuniGate Pro SMTP 4.1.3) with ESMTP id 2575074 for flyrotary@lancaironline.net; Wed, 10 Sep 2003 14:37:53 -0400 Received: from rad ([68.212.14.21]) by imf25aec.mail.bellsouth.net (InterMail vM.5.01.05.27 201-253-122-126-127-20021220) with ESMTP id <20030910183752.WEKD1843.imf25aec.mail.bellsouth.net@rad> for ; Wed, 10 Sep 2003 14:37:52 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: turbo wastegate requirements Date: Wed, 10 Sep 2003 13:37:52 -0500 Message-ID: <004401c377ca$a47b77c0$0201a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0045_01C377A0.BBA56FC0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0045_01C377A0.BBA56FC0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable > If you leave it open, the wastegate stays shut, and pieces of apex = seals start departing the engine :-0=20 Greg Richter welded his wastegate shut and used a pop-off valve. I wonder what his pop-off valve is set for. Unfortunately, pop-off = valves are of limited use on an airplane, since they're differential devices. = In other words, setting it at 3 psi means that it will open when the = pressure is 3 psi greater than the outside air pressure. At sea level, that = gives me just the limit that I want, but it only provides about 6,000 ft of = altitude compensation. Say I wanted to limit the turbo to 9 psi to give myself = sea level power up to 18000 ft. Now I would also have the ability to make 9 = psi at sea level, which will likely blow the engine. Even as a safety = device, the pop-off valve isn't ideal. While it saves the engine, it still = allows the turbo itself to overspeed, and possibly self-destruct. = Realistically, that probably brings you down in a plane, probably in flames from the exhaust leak. =20 > As I mentioned, I'm working with manual control only at this point.=20 a push pull cable to the actuator? A push pull cable to the wastegate lever. There is no "actuator", or I = am the actuator :-) > The reason is that I have 9.7 rotors me too Bruce estimated that I shouldn't go over 3 psi of boost at sea level, or = 36" MAP at any altitude.=20 >Gotta get a real oil cooler first. Hope you're arm gets better soon. Is it you're right arm, by any chance? Thanks, but I doubt it will. These injuries take a long time to heal. = It actually happens to be my left arm, but since I'm left handed, that = doesn't help me much. What does help is that left handed people have to be ambidextrous to some extent, since the world is made for right handed people. I'm still waiting for those left handed scissors I was promised = in school :-) Cheers, Rusty =20 ------=_NextPart_000_0045_01C377A0.BBA56FC0 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message

 > If you leave it open, the wastegate stays = shut, and=20 pieces of apex seals start departing the engine :-0

Greg Richter welded his wastegate shut and used a = pop-off=20 valve.

I wonder what his pop-off valve = is set=20 for.  Unfortunately, pop-off valves are of limited use on an = airplane,=20 since they're differential devices.  In other words, setting it = at 3=20 psi means that it will open when the pressure is 3 psi greater than the = outside=20 air pressure.  At sea level, that gives me just the = limit=20 that I want, but it only provides about 6,000 ft of altitude = compensation. =20 Say I wanted to limit the turbo to 9 psi to give myself sea = level=20 power up to 18000 ft.  Now I would also have the ability to make 9 = psi at=20 sea level, which will likely blow the engine.  Even as a = safety=20 device, the pop-off valve isn't ideal.  While it saves the engine, = it=20 still allows the turbo itself to overspeed, and=20 possibly self-destruct.  Realistically, that probably brings = you down=20 in a plane, probably in flames from the exhaust=20 leak.  

 > As I mentioned, I'm working with manual control only at = this=20 point.

a push pull cable to the actuator?

A push pull cable to the = wastegate=20 lever.  There is no "actuator", or I am the actuator=20 :-)

 > The reason is that I have 9.7 rotors
me = too

Bruce estimated that I = shouldn't go=20 over 3 psi of boost at sea level, or 36" MAP at any=20 altitude. 

>Gotta get a real oil cooler = first.
Hope=20 you're arm gets better soon. Is it you're right arm, by any chance?

Thanks, but I doubt it = will. =20 These injuries take a long time to heal.  It actually happens = to be my=20 left arm, but since I'm left handed, that doesn't help me much.  = What does=20 help is that left handed people have to be ambidextrous to some = extent,=20 since the world is made for right handed people.  I'm still waiting = for=20 those left handed scissors I was promised in school :-)

Cheers,
Rusty
 




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