X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 30 [X] Return-Path: Received: from fed1rmmtao103.cox.net ([68.230.241.43] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTP id 2038179 for flyrotary@lancaironline.net; Fri, 11 May 2007 12:03:00 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.43; envelope-from=alventures@cox.net Received: from fed1rmimpo01.cox.net ([70.169.32.71]) by fed1rmmtao103.cox.net (InterMail vM.7.05.02.00 201-2174-114-20060621) with ESMTP id <20070511160221.BQVV1318.fed1rmmtao103.cox.net@fed1rmimpo01.cox.net> for ; Fri, 11 May 2007 12:02:21 -0400 Received: from BigAl ([72.192.132.90]) by fed1rmimpo01.cox.net with bizsmtp id xs2L1W00Z1xAn3c0000000; Fri, 11 May 2007 12:02:21 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: EC2 question Date: Fri, 11 May 2007 08:02:30 -0800 Message-ID: <000001c793e5$c79541b0$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C793A2.B97472B0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C793A2.B97472B0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable What the EC 2 DOES do is have a two separate maps, the regular one,=20 and a map that is set for High RPM low MP (essentially for power off=20 fine pitch descents where you are using the engine as a brake). The=20 changeover point for that map is user defineable. So you can customize=20 it to your setup. I guess paul would have felt better with more maps=20 with more changeover points or something. =20 Just a slight correction. There are two Mixture correction tables, and = the cross over from Lo table to High table is set at about 3000 rpm and is = not user defined (at least not on mine). The injector stage point can be = set by the user (default is about 17" MAP, but varies depending on whether MAP = is going up or going down). =20 The 3000 rpm cross-over on mine is generally between about 13" and 14" = MAP. Low power, idle/taxi operation is generally on the Lo table. Flight = regime is normally on the High table. The higher MAP portion of the Lo table doesn't get used, at least not for fixed pitch prop. =20 =20 The corrections for the low MAP end of the High table may be different = than the low end of Lo table, because in a descent the MAP is likely to be = low, and the rpm above 3000. The low end of the High table can only be set = in flight (or perhaps without a prop) for obvious reasons. I haven't found much difference in the two, but I think the low end of the High table is = a bit leaner. =20 Beyond that, I agree - I have no idea what Paul had in mind. The MAP = value at which the cross-over occurs will vary depending on prop pitch, so = maybe that was his concern. The tuning may be a bit different for a CS prop = (like you will have to tune the Lo table to a higher MAP point), but so what. Once it is set, it's set. But I'll agree, it is a bit complicated, so if = you have never used the EC2, you could get confused. =20 Perhaps someone who is using the EC2 with CS prop can tell us whether = they have found the tuning more difficult. =20 Al ------=_NextPart_000_0001_01C793A2.B97472B0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

What the EC 2 DOES do is have a two separate maps, the regular one, =

and a map that is set for High RPM low MP (essentially for power off =

fine pitch descents where you are using the engine as a brake). The =

changeover point for that map is user defineable. So you can customize =

it to your setup. I guess paul would have felt better with more maps =

with more changeover points or something.

Just a slight correction. There are two Mixture correction tables, and the cross = over from Lo table to High table is set at about 3000 rpm and is not user = defined (at least not on mine). The injector stage point can be set by the = user (default is about 17” MAP, but varies depending on whether MAP is = going up or going down).

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The 3000 rpm = cross-over on mine is generally between about 13” and 14” MAP. = Low power, idle/taxi operation is generally on the Lo table. Flight regime is normally on the High table. The higher MAP portion of the Lo table = doesn’t get used, at least not for fixed pitch prop.

<= /font>

The = corrections for the low MAP end of the High table may be different than the low end of = Lo table, because in a descent the MAP is likely to be low, and the rpm above = 3000. The low end of the High table can only be set in flight (or perhaps without = a prop) for obvious reasons. I haven’t found much difference in the = two, but I think the low end of the High table is a bit = leaner.

<= /font>

Beyond that, = I agree – I have no idea what Paul had in mind. The MAP value at which the cross-over occurs will vary depending on prop pitch, so maybe that was = his concern. The tuning may be a bit different for a CS prop (like you = will have to tune the Lo table to a higher MAP point), but so what. = Once it is set, it’s set. But I’ll agree, it is a bit complicated, so = if you have never used the EC2, you could get confused.

<= /font>

Perhaps = someone who is using the EC2 with CS prop can tell us whether they have found the = tuning more difficult.

<= /font>

Al

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