X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-d22.mx.aol.com ([205.188.144.208] verified) by logan.com (CommuniGate Pro SMTP 5.2.5) with ESMTP id 3014786 for flyrotary@lancaironline.net; Mon, 07 Jul 2008 10:30:51 -0400 Received: from BMears9413@aol.com by imo-d22.mx.aol.com (mail_out_v38_r9.4.) id q.d17.2dcbbaf8 (37031) for ; Mon, 7 Jul 2008 10:30:47 -0400 (EDT) Received: from WEBMAIL-MC17 (webmail-mc17.webmail.aol.com [64.12.170.94]) by cia-db02.mx.aol.com (v121.5) with ESMTP id MAILCIADB021-90a7487228972c5; Mon, 07 Jul 2008 10:30:47 -0400 References: To: flyrotary@lancaironline.net Subject: Re: [FlyRotary] Re: Saga info and questions Date: Mon, 07 Jul 2008 10:30:47 -0400 X-AOL-IP: 65.182.71.8 In-Reply-To: X-MB-Message-Source: WebUI MIME-Version: 1.0 From: bmears9413@aol.com X-MB-Message-Type: User Content-Type: multipart/alternative; boundary="--------MB_8CAAE552EB05718_F08_11C4_WEBMAIL-MC17.sysops.aol.com" X-Mailer: AOL Webmail 37563-STANDARD Received: from 65.182.71.8 by WEBMAIL-MC17.sysops.aol.com (64.12.170.94) with HTTP (WebMailUI); Mon, 07 Jul 2008 10:30:47 -0400 Message-Id: <8CAAE552EA208EA-F08-8D3@WEBMAIL-MC17.sysops.aol.com> X-Spam-Flag:NO ----------MB_8CAAE552EB05718_F08_11C4_WEBMAIL-MC17.sysops.aol.com Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii" I would like to add something here. Last weekend we were running our supercharged RX3 at the drag strip. After a pass oil was everywhere. We cracked the rear iron at the dowel pin. Never seen this before and after doing some searching Dave Atkins thought we didnt get enough heat in the motor before we?nailed it. We cool it way down before each pass. Were running about 17lbs of boost. Dave says were creating too much heat too quick and the aluminum is expanding so fast its cracking the iron. Were not over heating, but it does get there fast. New experience for me, thought I would pass it on. Could be important for you turbo guys. Bob Mears -----Original Message----- From: John Slade To: Rotary motors in aircraft Sent: Mon, 7 Jul 2008 7:40 am Subject: [FlyRotary] Re: Saga info and questions Hi Chris,? This all sounds very familiar. Lets see if I can add some value...? >What I mean is it is starting within a couple of blades? That's better than mine now. I start after 2 or 3 revolutions of the prop.? ? >I am getting the volt reading on the EM2 flashing most of the time.? What voltage reading is it flashing at? You can adjust that it its too high.? ? > when I shut the primaries down at a higher RPM the engine stayed running on the secondary's? Thats part of my run-up check. (along with shutting off one set of coils, flipping fuel pumps and flipping to B computer)? Shutting down the primaries does cause a noticeable hesitation. It sounds like its going to doe, then picks up again.? ? >I have been able to get idle as low as about 1200 rpm, even though it is pretty rough.? Mine idles smoothly at around 8 - 900. With the IVO on full fine 1200 will be "fine" on approach. With the big fixed pitch prop 1200 would make the plane much less inclined to stop flying, but with the IVO chopping the throttle makes it sink quiet nicely. (Add both rudders and you're in an elevator). Watch out for the difference if you train on a fixed pitch - this caught me by surprise the first few times.? ? I saw a comment about gear chatter at lower RPM - I've heard one or twice in the past, but do not get it at all now.? ? >and then came out of auto tune mode.? Remember that there are two sets of tuning numbers, one of which controls mixture when the engine is being driven by the prop. As far as I remember, the second set cant be tuned on the ground. This caught me out when I throttled back on the downwind and the noise went away. A rapid manual increase in mixture brought it back, but it had me going there for a while.? ? >I got to about 5500 rpm and my RPM reading on the EM2 went blank.? Could be a vibration / connection issue.? ? >my temps are not all that bad considering the high heat on a stationary bird...? Not bad at all. In those conditions (S. Florida) my temps stabilize at around 210 so long as I don't give her much over idle. As soon as I do I'd better be ready to roll because it'll get over 220 fast. By the 5500 WOT on the IVO sounds good - if its the 3 blade 68 like mine - thats about what I get.? ? Regards,? John? ? --? Homepage: http://www.flyrotary.com/? Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html? ----------MB_8CAAE552EB05718_F08_11C4_WEBMAIL-MC17.sysops.aol.com Content-Transfer-Encoding: 7bit Content-Type: text/html; charset="us-ascii" I would like to add something here. Last weekend we were running our supercharged RX3 at the drag strip. After a pass oil was everywhere. We cracked the rear iron at the dowel pin. Never seen this before and after doing some searching Dave Atkins thought we didnt get enough heat in the motor before we nailed it. We cool it way down before each pass. Were running about 17lbs of boost. Dave says were creating too much heat too quick and the aluminum is expanding so fast its cracking the iron. Were not over heating, but it does get there fast. New experience for me, thought I would pass it on. Could be important for you turbo guys.

Bob Mears


-----Original Message-----
From: John Slade <sladerj@sbcglobal.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Mon, 7 Jul 2008 7:40 am
Subject: [FlyRotary] Re: Saga info and questions

Hi Chris, 
This all sounds very familiar. Lets see if I can add some value... 
>What I mean is it is starting within a couple of blades 
That's better than mine now. I start after 2 or 3 revolutions of the prop. 
 
>I am getting the volt reading on the EM2 flashing most of the time. 
What voltage reading is it flashing at? You can adjust that it its too high. 
 
> when I shut the primaries down at a higher RPM the engine stayed running on the secondary's 
Thats part of my run-up check. (along with shutting off one set of coils, flipping fuel pumps and flipping to B computer) 
Shutting down the primaries does cause a noticeable hesitation. It sounds like its going to doe, then picks up again. 
 
>I have been able to get idle as low as about 1200 rpm, even though it is pretty rough. 
Mine idles smoothly at around 8 - 900. With the IVO on full fine 1200 will be "fine" on approach. With the big fixed pitch prop 1200 would make the plane much less inclined to stop flying, but with the IVO chopping the throttle makes it sink quiet nicely. (Add both rudders and you're in an elevator). Watch out for the difference if you train on a fixed pitch - this caught me by surprise the first few times. 
 
I saw a comment about gear chatter at lower RPM - I've heard one or twice in the past, but do not get it at all now. 
 
>and then came out of auto tune mode. 
Remember that there are two sets of tuning numbers, one of which controls mixture when the engine is being driven by the prop. As far as I remember, the second set cant be tuned on the ground. This caught me out when I throttled back on the downwind and the noise went away. A rapid manual increase in mixture brought it back, but it had me going there for a while. 
 
>I got to about 5500 rpm and my RPM reading on the EM2 went blank. 
Could be a vibration / connection issue. 
 
>my temps are not all that bad considering the high heat on a stationary bird... 
Not bad at all. In those conditions (S. Florida) my temps stabilize at around 210 so long as I don't give her much over idle. As soon as I do I'd better be ready to roll because it'll get over 220 fast. By the 5500 WOT on the IVO sounds good - if its the 3 blade 68 like mine - thats about what I get. 
 
Regards, 
John 
 
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Homepage: http://www.flyrotary.com/ 
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