X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ms-smtp-03.southeast.rr.com ([24.25.9.102] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2080239 for flyrotary@lancaironline.net; Sat, 02 Jun 2007 08:58:51 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.102; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-103-061.carolina.res.rr.com [24.74.103.61]) by ms-smtp-03.southeast.rr.com (8.13.6/8.13.6) with SMTP id l52Cw2Ci022269 for ; Sat, 2 Jun 2007 08:58:02 -0400 (EDT) Message-ID: <004201c7a515$aed3f090$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Prop loads on engine Date: Sat, 2 Jun 2007 08:58:14 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_003F_01C7A4F4.27739450" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3028 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_003F_01C7A4F4.27739450 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Bill, base on my experience and your rpm there is no doubt you need the = larger prop as you clearly recognize.=20 Here is something you may want to check. When my Coldstart function = got turned on (without a switch being moved - long story) without me = knowing it at the time - my engine would bearly run with the manual = mixture control turned full lean with both primary and secondary on. = When I turned off the primary injectors it ran fine on the secondary = only because, of course, there was 1/2 the fuel flow of the four = injectors. Your symptoms sound very much like mine. One of my rotor = EGTs would also nose dive. Why just one, I am uncertain - you would = think both.=20 The only thing I can think for you to check is to put a voltohm meter = between the pin to the cold start switch on the control panel Pin 13 = (probably could put it on the output pin of the EC2 pin 30 if that's = easier) and ground. With both injector switches ON there should be no = ground at that pin it should show open on your voltohm meter (or a high = resistance). When you throw either injector switch off then that pin = should show a connection to ground. If it shows a ground when the = injector switches are OFF that could be your problem. Actually, since I = don't know the internal wiring of the EC2 this is just a SWAG on my = part. But, clearly if the cold start which functions when that pin is = grounded - shows a ground with both switches ON then I would bet = something is probably not right. The other alternative is that one injector in the primary set is = sticking open intermittently at lower rpm? =20 Ed ----- Original Message -----=20 From: Bill Schertz=20 To: Rotary motors in aircraft=20 Sent: Saturday, June 02, 2007 8:27 AM Subject: [FlyRotary] Prop loads on engine I have made my third test run trying to sort things out. I concur on = the need for a load on the engine. I have borrowed a Sensenich (sp?) = prop for the test runs, since my Catto prop has not arrived yet. It is = 76x60, and must be severely under propped (76x88 on order). I started the engine, throttle all the way back, then one turn = forward. Engine RPM on EM-2 ~ 2800. Engine was running rich, max number = of bars on mixture indicator. Tried leaning knob adjustment and it = helped some. Engine seemed to bog some so gave it one more turn = forward, then started playing with injector switches. Turning off the = primaries, engine smoothed out, and RPM shot up to almost 7000, this is = with very little throttle opening! Mixture went lean, and leaning knob = had significant effect. RPM would climb rapidly when I richened the = mixture. I cannot get anywhere close to the 22" manifold pressure for = some of the adjustments called for in the EC-2 manual. Will have to wait = for the more aggressive prop. You can see that Rotor 1 is bogging down until I shifted to = Secondaries only on the EGT plots. ------=_NextPart_000_003F_01C7A4F4.27739450 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Bill, base on my experience and your rpm there = is no doubt=20 you need the larger prop as you clearly recognize. 
 
 Here is something you may want to = check.  When=20 my Coldstart function got turned on (without a switch being moved - long = story)=20 without me knowing it at the time -  my engine would bearly run = with the=20 manual mixture control turned full lean with both primary and secondary=20 on.  When I turned off  the primary injectors it ran fine on = the=20 secondary only because, of course, there was 1/2 the fuel flow of the = four=20 injectors.  Your symptoms sound very much like = mine.   One=20 of my rotor EGTs would also nose dive.  Why just one, I am = uncertain - you=20 would think both. 
 
 The only thing I can think for you to = check is to=20 put a voltohm meter between the pin to the cold start switch on the = control=20 panel Pin 13 (probably could put it on the output pin of the = EC2 pin=20 30 if that's easier) and ground.   With both injector switches = ON=20 there should be no ground at that pin it should show open on your = voltohm meter=20 (or a high resistance).  When you throw either injector switch off = then=20 that pin should  show a connection to ground.  If it = shows a=20 ground when the injector switches are OFF that could be your = problem. =20 Actually, since I don't know the internal wiring of the EC2 this is just = a SWAG=20 on my part.  But, clearly if the cold start which functions when = that pin=20 is grounded - shows a ground with both switches ON then I would bet = something is=20 probably not right.
 
The other alternative is that one injector in = the primary=20 set is sticking open intermittently at lower rpm? 
 
Ed
----- Original Message -----
From:=20 Bill=20 Schertz
Sent: Saturday, June 02, 2007 = 8:27=20 AM
Subject: [FlyRotary] Prop loads = on=20 engine

I have made my third test run trying = to sort=20 things out. I concur on the need for a load on the engine.  I = have=20 borrowed a Sensenich (sp?) prop for the test runs, since my Catto prop = has not=20 arrived yet. It is 76x60, and must be severely under propped (76x88 on = order).
 
I started the engine, throttle all = the way back,=20 then one turn forward. Engine RPM on EM-2 ~ 2800. Engine was running = rich, max=20 number of bars on mixture indicator. Tried leaning knob adjustment and = it=20 helped some.  Engine seemed to bog some so gave it one more turn = forward,=20 then started playing with injector switches. Turning off the = primaries, engine=20 smoothed out, and RPM shot up to almost 7000, this is with very little = throttle opening! Mixture went lean, and leaning knob had significant = effect.=20 RPM would climb rapidly when I richened the mixture. I cannot get = anywhere=20 close to the 22" manifold pressure for some of the adjustments called = for in=20 the EC-2 manual. Will have to wait for the more aggressive = prop.
 
You can see that Rotor 1 is bogging = down until I=20 shifted to Secondaries only on the EGT plots.
 
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