Return-Path: Received: from fed1rmmtao02.cox.net ([68.230.241.37] verified) by logan.com (CommuniGate Pro SMTP 4.2.4) with ESMTP id 452297 for flyrotary@lancaironline.net; Mon, 04 Oct 2004 14:44:13 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.37; envelope-from=ALVentures@cox.net Received: from BigAl ([68.107.116.221]) by fed1rmmtao02.cox.net (InterMail vM.6.01.03.04 201-2131-111-106-20040729) with ESMTP id <20041004184341.TVX28263.fed1rmmtao02.cox.net@BigAl> for ; Mon, 4 Oct 2004 14:43:41 -0400 From: "Al Gietzen" To: "Rotary motors in aircraft" Subject: Low power 20B operation Date: Mon, 4 Oct 2004 11:43:57 -0700 Message-ID: <000001c4aa42$1b134e30$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C4AA07.6EB6C020" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C4AA07.6EB6C020 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Fired up the engine again this morning, and did the following tests: =20 1) Triggered the pirimary injectors individually; all "clicked" as expected. =20 2) The 'cold start' switch works fine, and never needs to be left on = more than about 4-5 seconds (at temps close to 70 F). I am pleased that the engine always starts promptly; even after being stalled due to an = over-rich condition; it restarts and clears quickly. =20 3) Staging is not happening; at rpm below 2000, runs fine on = secondary injectors, not as good on both sets, rather poorly on primary only. Something wrong on staging issue, and (maybe) with primary injectors. =20 4) Running on the secondary injectors only, slowed the engine all the = way down to 800 rpm; and quite smooth all the way down. =20 5) No difference between controllers A and B at any condition tested. =20 6) Wiring harness does not allow reversing the injector connectors, = but does allow connecting the primary injectors to the secondary leads. Did = this and left the secondary disconnected. The behavior was similar to = running on 'primary only' when connected normally; but, I concluded, not the same. = When connected to the secondary leads I could get almost to smooth running at about 1750 with the mixture knob near full lean. At the same throttle = and mixture setting, connecting them to the primary leads resulted in some surging, and required a bit richer mixture to stop the surge and was = then not as smooth as when connected to the secondary leads. =20 =20 I don't know what to conclude from item 5), except that it may be true = that high-flow injectors in the primary rail at the rotor housing do not = allow smooth running at low MAP and rpm with this controller. I hesitate to = draw any conclusion until the reasons for the loss of staging function are resolved, and whether or not this has any relation to the way it runs on = the primary only. =20 Al =20 =20 ------=_NextPart_000_0001_01C4AA07.6EB6C020 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Fired up the engine again this morning, and did the following tests:

1) Triggered the pirimary injectors = individually; all “clicked” as expected.

2) The ‘cold start’ switch works = fine, and never needs to be left on more than about 4-5 seconds (at temps close to = 70 F). I am pleased that the engine always starts promptly; even after being = stalled due to an over-rich condition; it restarts and clears = quickly.

3) Staging is not happening; at rpm below 2000, = runs fine on secondary injectors, not as good on both sets, rather poorly on = primary only. Something wrong on staging issue, and (maybe) with primary injectors.

4) Running on the secondary injectors only, = slowed the engine all the way down to 800 rpm; and quite smooth all the way = down.

5) No difference between controllers A and B at = any condition tested.

6) Wiring harness does not allow reversing the injector connectors, but does allow connecting the primary injectors to = the secondary leads. Did this and left the secondary disconnected. The behavior was similar to running on ‘primary only’ when = connected normally; but, I concluded, not the same. When connected to the = secondary leads I could get almost to smooth running at about 1750 with the mixture knob = near full lean. At the same throttle and mixture setting, connecting them to = the primary leads resulted in some surging, and required a bit richer = mixture to stop the surge and was then not as smooth as when connected to the = secondary leads.

I don’t know what to conclude from item 5), = except that it may be true that high-flow injectors in the primary rail at the = rotor housing do not allow smooth running at low MAP and rpm with this = controller. I hesitate to draw any conclusion until the reasons for the loss of = staging function are resolved, and whether or not this has any relation to the = way it runs on the primary only.

Al

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