X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail24.syd.optusnet.com.au ([211.29.133.165] verified) by logan.com (CommuniGate Pro SMTP 5.0.6) with ESMTPS id 928888 for flyrotary@lancaironline.net; Mon, 16 Jan 2006 17:01:40 -0500 Received-SPF: none receiver=logan.com; client-ip=211.29.133.165; envelope-from=lendich@optusnet.com.au Received: from george (d220-237-235-124.dsl.nsw.optusnet.com.au [220.237.235.124]) by mail24.syd.optusnet.com.au (8.12.11/8.12.11) with SMTP id k0GM0hUR010503 for ; Tue, 17 Jan 2006 09:00:48 +1100 Message-ID: <005101c61ae8$4e001180$7cebeddc@george> From: "george lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: shake, rattle and hum Date: Tue, 17 Jan 2006 08:00:45 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_004E_01C61B3C.1E92E950" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_004E_01C61B3C.1E92E950 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Georges, I've given up trying to find good Rotor housings - it's cheaper to buy = them new! George ( down under) Rusty Just a thought, would changing the prop position in by one or = two bolt holes make a difference? By the way guys after dismantling 5 = 13bs I still don't have any good rotor housings. Has any one got a = couple of mint ones for sale? I'm in Canada. Georges B.=20 -------Original Message------- From: Russell Duffy Date: 01/15/06 17:04:34 To: Rotary motors in aircraft Subject: [FlyRotary] shake, rattle and hum Greetings, I went out to the airport this afternoon to try to add some = flywheel weight to the single rotor. Installed longer AN-7 bolts, each = with an additional 4 larger washers, and 5 small washers. This added = about 26 ounces to the flexplate, at the 4 dampener bolt locations. Unfortunately, it didn't change a thing wrt the vibration = issues, or prop oscillation. Still shaky around 1000 rpm, severe drive = rattle around 1900-2000 rpm (can't bear to try to find the exact range), = and severe vibration from 2500-3100. From 3300 to 5000 it's pretty = smooth, but with the scary prop oscillation getting worse and worse as = the rpm increases. =20 Not sure what to try next. I do have a two blade IVO prop that = I could try in place of the 3 blade Warp Drive, but I'd have to cut the = blades down from 72" to 68" to clear the fuselage tube. The torque = reversals might not be the best thing for an IVO prop either. I'm = starting to fear that someone's going to get a deal on an RD-1C drive = while I look for another solution, and build an RV-8. =20 I'm still finding that I don't have enough fuel at anything = above idle. I was actually having to run the cold start, and mixture = above 12:00 to have a mid range O2 reading at 3000-4000 rpm. I set mode = 3 today, and kept raising the fuel until I got a mid range reading with = the mixture at 12:00, and no cold start engaged. This took 24 clicks!!! = Something just ain't right here... =20 Before I started today, I checked the fuel pressure using a = mighty-vac pump to simulate changes to the MAP line. The regulator = changed pressure just like it's supposed to.=20 I made myself a note to check the fuel pressure calibration = again the next time I go to the hanger. I set this using a different = sensor, that I believed to be the same as the one that's installed on = the regulator. That should have gotten me very close, unless I = accidentally used a sensor that was different (30 psi rather than 80 psi = for example). Once I had the fuel pressure "calibrated" on the EM-2, I = used that reading to set the adjustable regulator for 42 psi. Maybe my = pressure "reads" 42 psi, but is really way low, like 15 psi or so. If the fuel pressure is correct, I'll have to look into the = injectors themselves. They're 400 cc/min MSD injectors, just like what = was on the RV-3. These were ordered just for this, and never used on = anything else, so maybe I was sent something smaller than 400 cc/min. = Worst case, I have a pair of 525's that I can install if needed. =20 Ah, the fun begins. Pity I don't have time to fiddle with this = much now. The QB RV-8 will be here soon. =20 Cheers, Rusty (the weather geek) PS- The following link is the weather station in my back yard. = The wind gust readings don't seem to be reporting correctly by the = Weather Underground software, but otherwise, it's pretty cool. My hope = is that we'll never get another hurricane, now that I'm set up to record = the wind conditions. =20 = http://www.weatherunderground.com/weatherstation/WXDailyHistory.asp?ID=3D= KFLNAVAR7 =20 =20 =20 ------=_NextPart_000_004E_01C61B3C.1E92E950 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Georges,
I've given up trying to find good Rotor housings - = it's=20 cheaper to buy them new!
George ( down under)
Rusty
Just a thought, would changing the prop position in by = one or=20 two bolt holes make a difference? By the way guys after = dismantling 5=20 13bs I still don't have any good rotor housings. Has any one got = a=20 couple of mint ones for sale? I'm in Canada.
Georges B. 
 
-------Original=20 Message-------
 
From: Russell Duffy
Date: = 01/15/06=20 17:04:34
To: Rotary motors in=20 aircraft
Subject: = [FlyRotary]=20 shake, rattle and hum
 
Greetings,
 

I went out to the airport this = afternoon to try=20 to add some flywheel weight to the single rotor.  = Installed=20 longer AN-7 bolts, each with an additional 4 larger washers, and = 5 small=20 washers.  This = added about=20 26 ounces to the flexplate, at the 4 dampener bolt = locations.

 

Unfortunately, it didn=92t change a thing wrt the = vibration=20 issues, or prop oscillation.  Still shaky around 1000 rpm, severe = drive=20 rattle around 1900-2000 rpm (can't bear to try to find the exact = range),  and severe vibration from 2500-3100.  From = 3300 to=20 5000 it's pretty smooth, but with the scary prop oscillation = getting=20 worse and worse as the rpm increases.  =

Not sure=20 what to try next.  = I do have=20 a two blade IVO prop that I could try in place of the 3 blade=20 Warp Drive, = but I=92d=20 have to cut the blades down from 72=94 to 68=94 to clear the = fuselage=20 tube.  The torque reversals might not be the = best=20 thing for an IVO prop either.  I=92m starting = to fear=20 that someone=92s going to get a deal on an RD-1C drive while I = look for=20 another solution, and build an=20 RV-8.  =

I=92m=20 still finding that I don=92t have enough fuel at anything above = idle.  I was actually having = to run the=20 cold start, and mixture above 12:00 to have a mid range O2 reading at = 3000-4000=20 rpm.  I set mode 3 = today,=20 and kept raising the fuel until I got a mid range reading with = the=20 mixture at 12:00, = and no cold=20 start engaged.  = This took 24=20 clicks!!!  Something just ain't right = here... =20

Before I=20 started today, I checked the fuel pressure using a mighty-vac = pump to=20 simulate changes to the MAP line. =20 The regulator changed pressure just like it=92s supposed = to.=20

I made=20 myself a note to check the fuel pressure calibration again the = next time=20 I go to the hanger.  = I set=20 this using a different sensor, that I believed to be the same as = the one=20 that=92s installed on the regulator. =20 That should have gotten me very close, unless I = accidentally used=20 a sensor that was different (30 psi rather than 80 psi for=20 example).  Once I = had the=20 fuel pressure =93calibrated=94 on the EM-2, I used that reading = to set the=20 adjustable regulator for 42 psi. =20 Maybe my pressure "reads" 42 psi, but is really way = low, like 15=20 psi or so.

If the=20 fuel pressure is correct, I=92ll have to look into the injectors = themselves.  = They=92re 400=20 cc/min MSD injectors, just like what was on the RV-3.  These were ordered = just for=20 this, and never used on anything else, so maybe I was sent = something=20 smaller than 400 cc/min.  = Worst case, I have a pair of 525=92s that I can install = if=20 needed.  

 

Ah, the fun begins.  Pity I = don't=20 have time to fiddle with this much now. The QB RV-8 will be here = soon.  

 

Cheers,

=

Rusty (the=20 weather geek)

&nbs= p;

PS-  The following link is the weather = station in my=20 back yard.  The wind gust readings don't seem to be = reporting=20 correctly by the Weather Underground software, but otherwise, = it's=20 pretty cool.  My hope is that we'll never get another = hurricane,=20 now that I'm set up to record the wind conditions. =20

 

http://www.weatherunderground.com/weatherstation/WXDai= lyHistory.asp?ID=3DKFLNAVAR7

 

 

 
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