X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from securemail.ever-tek.com ([64.129.170.194] verified) by logan.com (CommuniGate Pro SMTP 5.3.9) with ESMTP id 4468147 for flyrotary@lancaironline.net; Wed, 15 Sep 2010 14:49:11 -0400 Received-SPF: none receiver=logan.com; client-ip=64.129.170.194; envelope-from=cbarber@texasattorney.net Received: from fcd-mail06.FCDATA.PRIVATE ([2002:404:40b::404:40b]) by FCD-MAIL06.FCDATA.PRIVATE ([::1]) with mapi; Wed, 15 Sep 2010 13:48:14 -0500 From: Chris Barber To: Rotary motors in aircraft Subject: RPM drop out on EM2 (too close to first flight to procrastinate) Thread-Topic: RPM drop out on EM2 (too close to first flight to procrastinate) Thread-Index: ActVBozZyAa9DZ8gTGySYdMwDf1DBQ== Date: Wed, 15 Sep 2010 18:48:13 +0000 Message-ID: <2D41F9BF3B5F9842B164AF93214F3D303269547A@FCD-MAIL06.FCDATA.PRIVATE> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: Content-Type: multipart/alternative; boundary="_000_2D41F9BF3B5F9842B164AF93214F3D303269547AFCDMAIL06FCDATA_" MIME-Version: 1.0 --_000_2D41F9BF3B5F9842B164AF93214F3D303269547AFCDMAIL06FCDATA_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable This issue has been briefly discussed before. Specifically in May of 2009 = by Don Walker with the topic of "Fine Tuning" 2. Starting at about 6000 RPM, the RPM display on the EM-2 starts dropping = out. By the time the RPM gets to 6500 or so it is almost completely gone, = but comes back when I reduce the throttle. I have an optical prop tach so = I know it's speed with some possible solutions further down in the email I have had an e-mail discussion with Tracy and he says there may be an El= ectrical noise problem. He wrote, "a cap and a resistor on the injector li= ne to the EM-2". That's it, but no specifics or drawings. Anyone have any= thoughts on this? Right now I have EC-2 line 17 hooked to line p3-6 on th= e EM-2. It was suggested to do this to make the signal stronger rather tha= n have it just come via the serial lines. By the way, I'm not an EE or ele= ctronics tech so I really don't know what I'm doing, just a guy who can usu= ally follow directions. I suspect there may be a common cause to all this.= Perhaps it is electrical noise. It seems to be part of it. If the noise= problem takes care of some of this, great. Then on to the remaining. My = next experiment will be to run the engine with only the Essential buss on a= nd see if anything changes. I only have one Ground line off my battery to = the Firewall ground. If I remember correctly, 2 grounds run off that to th= e engine and that's it. This cutting edge stuff takes forever. Thankfully= it's not bleeding edge. Don, Tracy...Ed....??? Was there a resolution to this issue as I am having = the same thing happen to me. As I approach 6000 rpm the display on the EM2= drops out to zero, but may flash other values as well. When I pull back o= n the throttle, the display to appear to become happier and display what I = think/hope is accurate but will drop out again if I add power. I was somewhat pleased that this was described on an RV since often the fir= st thing folks will key in on for my project is the long wire runs on my Ve= locity. Course, it could be the long wire runs, but RV's do not usually ha= ve this particular issue. I also, like Don mentioned in his original post, am not a EE, but am usuall= y somewhat trainable. I would have no idea of where to start to address th= ese issues....especially such as adding a cap and resistor. Heck, I don't = even know what a cap is and just kinda sorto know what a resistor is. Also= , what "size" of these items would be used and how would they be used??????= installed?????etc????? I thought I would touch base here before I considered troubling Tracy with = a call based in ignorance and frustration. I did search the archives (as e= videnced by finding Don's post), however, determining WHAT to search for ca= n be a bit elusive as times. I am really quite close to potential first flight. Other than a few gremli= ns like the one mentioned, I am pretty much left with readjusting the toe i= n since the wings and engine have been installed, setting the wing incidenc= es to the canard again and weighing the thing...oh, and calling my local DA= R. Another gremlin for your consideration. Again, concerning the EM2, I have = had the displayed numerals disappear. They will then come back. I have RE= -checked the wires and all is as it should be, as it has been when I checke= d in the past. It may be the rheostat connection as it is the only thing = I have not yet checked and it sorta acts as if the rheostat has bee turned. Finally, again, EM2, my EGT readings are jumping all over the place. From = maybe 300 degrees to 8500 degrees. It appears random and jumps all over t= he place. Not surprising it trips my "trouble light". Again, I have check= ed and rechecked the wires and connections. My next troubleshooting check = will be to pull the sensors themselves from the turbo manifold. I am wonde= ring if I placed the sensors too close to the rotary exhaust (about 3 inche= s from the ports) and I fried the sensors. Tracy's tech day is Saturday, Right??? Thanks in advance guys. I would not have come this far without ya. All the best, Chris Barber Houston Velocity N17010 --_000_2D41F9BF3B5F9842B164AF93214F3D303269547AFCDMAIL06FCDATA_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
This issue has been briefly discussed before.  Specifically in Ma= y of 2009 by Don Walker with the topic of "Fine Tuning"
 
with some possible solutions further down in t= he email
 
  I have had an e-mail discussion with Tracy and he s= ays there may be an Electrical noise problem.  He wrote, "a cap a= nd a resistor on the injector line to the EM-2".  T= hat's it, but no specifics or drawings.  Anyone have any thoughts on this?  Right now I have EC-2 line 17 hooked to line p3-6 on the EM-2.  It was suggested to do this to make t= he signal stronger rather than have it just come via the serial lines. = ; By the way, I'm not an EE or electronics tech so I really don't know what I'm doing, just a guy who can usually follow d= irections.  I suspect there may be a common cause to all this.  P= erhaps it is electrical noise.  It seems to be part of it.  If th= e noise problem takes care of some of this, great.  Then on to the remaining.  My next experiment will be to run the engi= ne with only the Essential buss on and see if anything changes.  I onl= y have one Ground line off my battery to the Firewall ground.  If I re= member correctly, 2 grounds run off that to the engine and that's it.  This cutting edge stuff takes forever.  T= hankfully it's not bleeding edge.
 
Don, Tracy...Ed....??? Was there a resolution to this issu= e as I am having the same thing happen to me.  As I approach 6000 rpm = the display on the EM2 drops out to zero, but may flash = other values as well.  When I pull back on the throttle, the display to appear to become happier and display what = I think/hope is accurate but will drop out again if I add power.
 
I was somewhat pleased that this was described= on an RV since often the first thing folks will key in on for my project i= s the long wire runs on my Velocity.  Course, it could be the long wir= e runs, but RV's do not usually have this particular issue.
 
I also, like Don mentioned in his original post, am not a = EE, but am usually somewhat trainable.  I would have no idea of where = to start to address these issues....especially such as adding a cap and res= istor.  Heck, I don't even know what a cap is and just kinda sorto k= now what a resistor is.  Also, what "size" of these items wo= uld be used and how would they be used??????installed?????etc?????
 
I thought I would touch base here before I considered trou= bling Tracy with a call based in ignorance and frustration.  I did sea= rch the archives (as evidenced by finding Don's post), however,=  determining WHAT to search for can be a bit elusive as times.
 
I am really quite close to potential first flight.  O= ther than a few gremlins like the one mentioned, I am pretty mu= ch left with readjusting the toe in since the wings and engine = have been installed, setting the wing incidences to the canard again and weighing the thing...oh, and calling my local DAR.=
Another gremlin for your consideration.  = Again, concerning the EM2, I have had the display= ed numerals disappear.  They will then come back.  I have = RE-checked the wires and all is as it should be, as it has been when I checked in the past.  It may be the rheostat&= nbsp; connection as it is the only thing I have not yet checked= and it sorta acts as if the rheostat has be= e turned.
 
Finally, again, EM2, my EGT readings are jumping all over the place.  From maybe  300 degr= ees to 8500 degrees.  It appears random and jumps all over the place.&= nbsp; Not surprising it trips my "trouble light".&nbs= p; Again, I have checked and rechecked the wires and connections.  My next trou= bleshooting check will be to pull the sensors themselves from the turbo man= ifold.  I am wondering if I placed the sensors too close to the rotary= exhaust (about 3 inches from the ports) and I fried the sensors.
 
Tracy's tech day is Saturday, Right???
 
Thanks in advance guys. I would not have come this far wit= hout ya.
 
All the best,
 
Chris Barber
Houston
Velocity N17010
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