Return-Path: <13brv3@bellsouth.net> Received: from imf16aec.mail.bellsouth.net ([205.152.59.64] verified) by logan.com (CommuniGate Pro SMTP 4.1.1) with ESMTP id 2531266 for flyrotary@lancaironline.net; Sun, 17 Aug 2003 11:58:50 -0400 Received: from rad ([68.212.14.21]) by imf16aec.mail.bellsouth.net (InterMail vM.5.01.05.27 201-253-122-126-127-20021220) with ESMTP id <20030817155849.CZFR1778.imf16aec.mail.bellsouth.net@rad> for ; Sun, 17 Aug 2003 11:58:49 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: boost controllers Date: Sun, 17 Aug 2003 10:58:51 -0500 Message-ID: <000001c364d8$73c798c0$0201a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C364AE.8AF190C0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C364AE.8AF190C0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable The stock waste gate controller is about as light as it gets and you shouldn't run into any problems with the ~5-7 psi it usually dishes out. But if you wanted to decrease the boost you could lengthen the actuating = arm a little or change out the spring. =20 =20 Install the stock waste gate controller, Rusty. It does little good to = have a turbo that doesn't produce any boost and you can easily control your manifold pressure with the throttle (every turbo car runs just fine = idle). Also, keeping that waste gate closed at low power settings will help = quiet the exhaust. =20 David Leonard =20 Thanks for the comments David. At the moment, I've got a manual cable hooked up to the wastegate, and will be leaving it fully open for = initial testing. I've tried closing the wastegate at about 2000 rpm, and could = hear the difference in sound, but it wasn't that significant. =20 =20 I asked Bruce how much pressure he thought I could safely run with 9.7 rotors, and he said 2-3 psi (32-33 MAP). For now, I will do everything possible to stay below that limit, which is why I have a relief valve = that's holding me to 3 psi. Clearly, I don't want to keep the relief valve = set so low, but it's already saved my engine once, so it stays until I prove = that I can control the boost manually during flight ops. =20 =20 Eventually, I'll probably try a normal wastegate actuator, but I'll want = the lowest possible spring pressure. On the other hand, I may find that my fully open wastegate will still give me 5-6 psi of boost, so getting a = lower spring pressure on the actuator would be a waste of time. Yep, lots of experiments to perform, and data to collect. =20 =20 Cheers, Rusty =20 ------=_NextPart_000_0001_01C364AE.8AF190C0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
The stock = waste gate=20 controller is about as light as it gets and you shouldn’t run into = any problems=20 with the ~5-7 psi it usually dishes out.  But if you wanted to = decrease the=20 boost you could lengthen the actuating arm a little or change out the=20 spring. 

 

Install the = stock waste=20 gate controller, Rusty.  It does little good to have a turbo that = doesn’t=20 produce any boost and you can easily control your manifold pressure with = the=20 throttle (every turbo car runs just fine idle).  Also, keeping that = waste=20 gate closed at low power settings will help quiet the = exhaust.

 

David=20 Leonard

 

Thanks for the = comments=20 David.  At the moment, I've got a manual cable hooked up = to=20 the wastegate, and will be leaving it fully open for initial=20 testing.  I've tried closing the wastegate at about 2000 rpm, and = could=20 hear the difference in sound, but it wasn't that significant. =20

 

I asked Bruce = how much=20 pressure he thought I could safely run with 9.7 rotors, and he said 2-3 = psi=20 (32-33 MAP).  For now, I will do everything possible to stay below = that=20 limit, which is why I have a relief valve that's holding me to 3=20 psi.   Clearly, I don't want to keep the relief valve set = so low,=20 but it's already saved my engine once, so it stays until I prove = that I=20 can control the boost manually during flight ops. =20

 

Eventually,=20 I'll probably try a normal wastegate actuator, but I'll want the = lowest=20 possible spring pressure.  On the other hand, I may find that = my fully=20 open wastegate will still give me 5-6 psi of boost, so getting a = lower=20 spring pressure on the actuator would be a waste of time.  Yep, = lots of=20 experiments to perform, and data to=20 collect.  

 

Cheers,

Rusty

    =20

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