Return-Path: Received: from [24.25.9.101] (HELO ms-smtp-02-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 5.0) with ESMTP id 814534 for flyrotary@lancaironline.net; Fri, 04 Nov 2005 08:49:05 -0500 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.101; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-025-165.carolina.res.rr.com [24.74.25.165]) by ms-smtp-02-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id jA4DmH4p021581 for ; Fri, 4 Nov 2005 08:48:17 -0500 (EST) Message-ID: <000901c5e146$69a77670$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Another Run - with Questions Date: Fri, 4 Nov 2005 08:48:18 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0006_01C5E11C.80910A10" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0006_01C5E11C.80910A10 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageOk, Rusty, I'll ask. What makes the Xl more attractive to you = than an RV-8? Not a bad aircraft from what I read, but don't think it = can really compare to bang for buck of an RV-8? Curious minds want to know. Ed A ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Friday, November 04, 2005 8:32 AM Subject: [FlyRotary] Re: Another Run - with Questions But I'm in a bit of a quandary. I set TDC on the flywheel as Lynn = described and it looked so perfect. But the timing light is showing it = firing at 40+Deg. ATDC and when I turn the Crank Angle sensor as far as = it will go trying to advance it I can only get up to about 20Deg ATDC.=20 Hi Joe, Static timing is just that "static". Once you start running, your = ignition controller decides where it wants the timing to be relative to = the static timing, so think of the static timing as nothing more than a = reference for the controller. =20 As you know, the faster the rotor is moving, the less time the spark = has to complete ignition, so you have to advance the timing to start it = a bit earlier, so ignition occurs in the correct position of the rotor. = Using the same logic, the timing can be retarded at idle. For a complex = controller like the MicroTech, I would not be surprised to find out that = they're taking advantage of a larger range of timing than aircraft = normally use. Now, I am supposed to put the timing light on the #1 Leading plug = lead, right? That's what my Mazda manual says.=20 That would be my guess. I'd assume that it's done the normal, Mazda = way, unless MicroTech tells you otherwise. =20 =20 I guess I'll have to see if I can re-position my Crank Angle sensor = this weekend and see what happens when I can advance it further.=20 I haven't looked at it closely in a while, but I'm guessing you can = pull the CAS, and rotate the gear a tooth, then reinstall it. By = experimenting with this, I'd bet you can get the desired timing within = range of the slot on the CAS. =20 =20 The MicroTech setup manual says to set the idle timing to 5Deg ATDC - = it also says that is the yellow mark on the pulley).=20 They're probably right :-) At some point, you'll want to verify that = the MicroTech is advancing the timing properly at higher rpms, but if = the only timing adjustment they gave was at idle, then I'd bet a few = beers it's going to be right everywhere. =20 Joe Hull (loving the smell of exhaust in the my hair, my clothes, my = skin.) Might cut into your social life though :-) Cheers, Rusty (XL pulling farther into the lead)=20 ------=_NextPart_000_0006_01C5E11C.80910A10 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Ok, Rusty, I'll ask.  What makes the Xl = more=20 attractive to you than an RV-8? Not a bad aircraft from what I read, but = don't=20 think it can really compare to bang for buck of an RV-8?
Curious minds want to know.
 
Ed A
----- Original Message -----
From:=20 Russell=20 Duffy
Sent: Friday, November 04, 2005 = 8:32=20 AM
Subject: [FlyRotary] Re: = Another Run -=20 with Questions

But I=92m = in a bit of a=20 quandary.  I set TDC on = the=20 flywheel as Lynn described and it looked so perfect. But the timing = light is=20 showing it firing at 40+Deg. ATDC and when I turn the Crank Angle = sensor as=20 far as it will go trying to advance it I can only get up to about = 20Deg=20 ATDC. 
 
Hi=20 Joe,
 
Static = timing is just that=20 "static".  Once you start running, your ignition controller = decides where=20 it wants the timing to be relative to the static timing, so think of = the=20 static timing as nothing more than a reference for the = controller. =20
 
As you know, = the faster=20 the rotor is moving, the less time the spark has to complete ignition, = so you=20 have to advance the timing to start it a bit earlier, so ignition = occurs in=20 the correct position of the rotor.  Using the same logic, = the timing=20 can be retarded at idle.  For a complex controller like the=20 MicroTech, I would not be surprised to find out that they're = taking=20 advantage of a larger range of timing than aircraft normally=20 use.
 
Now, I am = supposed to=20 put the timing light on the #1 Leading plug lead, right? That=92s what = my Mazda=20 manual says. 
 
That = would be my=20 guess.  I'd assume that it's done the normal, Mazda way, unless = MicroTech=20 tells you = otherwise.  
 <= /FONT>

I guess = I=92ll have to=20 see if I can re-position my Crank Angle sensor this weekend and see = what=20 happens when I can advance it further. 

 

<= FONT=20 color=3Dnavy size=3D2>
I haven't = looked at it=20 closely in a while, but I'm guessing you can pull the CAS, and rotate = the gear=20 a tooth, then reinstall it.  By experimenting with this, I'd bet = you can=20 get the desired timing within range of the slot on the=20 = CAS.  

 <= /FONT>

The MicroTech setup manual says to set the idle = timing to 5Deg=20 ATDC =96 it also says that is the yellow mark on the pulley). 

 

<= FONT=20 color=3Dnavy size=3D2>
They're=20 probably right :-)  At some point, you'll want to verify = that the=20 MicroTech is advancing the timing properly at higher rpms, but if = the=20 only timing adjustment they gave was at idle, then I'd = bet a=20 few beers it's going to be right everywhere.  =   

 

Joe=20 Hull (loving the smell of exhaust in the my hair, my clothes, my=20 skin=85)

 

Might cut = into your social=20 life though :-)

 

Cheers,

Rusty (XL = pulling farther=20 into the=20 lead) 

------=_NextPart_000_0006_01C5E11C.80910A10--