X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 2 [X] Return-Path: Received: from imf18aec.mail.bellsouth.net ([205.152.59.66] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTP id 1987112 for flyrotary@lancaironline.net; Sun, 15 Apr 2007 21:08:50 -0400 Received-SPF: none receiver=logan.com; client-ip=205.152.59.66; envelope-from=rusty@radrotary.com Received: from ibm59aec.bellsouth.net ([65.6.194.9]) by imf18aec.mail.bellsouth.net with ESMTP id <20070416010805.WLJN19736.imf18aec.mail.bellsouth.net@ibm59aec.bellsouth.net> for ; Sun, 15 Apr 2007 21:08:05 -0400 Received: from rd ([65.6.194.9]) by ibm59aec.bellsouth.net with ESMTP id <20070416010804.CCB884.ibm59aec.bellsouth.net@rd> for ; Sun, 15 Apr 2007 21:08:04 -0400 From: "Russell Duffy" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: single rotor testing Date: Sun, 15 Apr 2007 20:08:04 -0500 Message-ID: <000001c77fc3$afa67320$6e01a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C77F99.C6D06B20" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6822 Importance: Normal Thread-Index: Acd/d6nNO9hyNe3SQq2IxMPmiK0tywASHXQQ 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_01C77F99.C6D06B20 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable you should get a speeding ticket!! Everyone else is toiling away for years and you just slam together some parts and start it!=20 =20 Hi Thomas. Well, in this case, no records were broken. This is the = same engine I had running on the Kolb about a year ago. All I did recently = was change the gear drive, and put it on a trailer as a test stand. I even = used the same wiring, hoses, and even the old Kolb inst panel, so there = really wasn't that much to it. =20 =20 For your 1-rotor, you a right about more inertia from the flywheel, but = you could keep mass down by making it a big diameter with most of the mass = at the rim, inertia-effect goes up with radius at the same weight (actually = it goes up with the square, if don't get it completely wrong here) =20 =20 That would be the plan. I've all but forgotten about remaking the = current aluminum adapter, because it would be too heavy, without helping much. = It's also way easier to make a heavy ring that uses the existing bolt holes = in the flexplate. I'd have to come up with a way to balance it, and it = would have to be at least 10 lbs I think. I tried several pounds before (with Tracy's drive), and it made no difference at all. =20 =20 Also what about a freewheel-unit, before the PSRU? Something like in car-auto-trans, it would not eliminate the torque reversal in the = engine, but keep it from going into the gearbox/prop.=20 =20 You mean like a torque converter? That might help, but there's no room = for that. A few of the two strokes use "slipper clutches" to help with the gearbox resonance.=20 =20 By the time the Mazda-1-rotor is smooth and idles well, it probably will cost the same as a small re-engineered 2- or 3-rotor. You mentioned = Alu-side housings - as the price is now, these already buy a whole 40-hp = engine..... unless Mazda goes Alu at some point....=20 =20 Nevertheless, keep hacking on it!!=20 =20 This is one of those projects I'm doing just because I want to. It's = clear that it may never become anything worth using, but it's an interesting exercise nonetheless. With any luck, it will keep me busy until = someone makes an ideal engine :-) =20 BTW, I found no evidence at all of damage from my missing piece of = intake. I can't inspect everything through the intake and exhaust ports, but = what I can see looks perfect, and certainly the apex seals are fine. There's = about a 50% chance that the aluminum piece came off after I removed the = intake, since I was trying to break it the rest of the way apart after I got it = off the engine. I didn't see the missing piece on the workbench, or floor, = but that doesn't mean much either.=20 =20 Rusty =20 ------=_NextPart_000_0001_01C77F99.C6D06B20 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
you should get a speeding ticket!!
Everyone else is toiling away for years and you just slam together = some=20 parts and start it! 
 
Hi=20 Thomas.  Well, in this case, no records were broken.  This is = the same=20 engine I had running on the Kolb about a year ago.  All I did = recently=20 was change the gear drive, and put it on a trailer as a test = stand.  I even=20 used the same wiring, hoses, and even the old Kolb inst panel, so = there=20 really wasn't that much to it. 
 
For your 1-rotor, you a right about more inertia from the flywheel, = but you=20 could keep mass down by making it a big diameter with most of the mass = at the=20 rim, inertia-effect goes up with radius at the same weight (actually it = goes up=20 with the square, if don't get it completely wrong here)  
 
That=20 would be the plan.  I've all but forgotten about remaking the = current=20 aluminum adapter, because it would be too heavy, without helping = much. =20 It's also way easier to make a heavy ring that uses the existing bolt = holes in=20 the flexplate.  I'd have to come up with a way to balance it, = and it=20 would have to be at least 10 lbs I think.  I tried several pounds = before=20 (with Tracy's drive), and it made no difference at all.  =   
 
Also what about a freewheel-unit, before the PSRU? Something like = in=20 car-auto-trans, it would not eliminate the torque reversal in the = engine, but=20 keep it from going into the gearbox/prop. 
 
You mean like=20 a torque converter?  That might help, but there's no room for = that.  A=20 few of the two strokes use "slipper clutches" to help with the gearbox=20 resonance. 
 
By the time the Mazda-1-rotor is smooth and idles well, it probably = will=20 cost the same as a small re-engineered 2- or 3-rotor. You mentioned = Alu-side=20 housings - as the price is now, these already buy a whole 40-hp = engine.....=20 unless Mazda goes Alu at some point....
 
Nevertheless, keep hacking on it!! 
 
This is one=20 of those projects I'm doing just because I want to.  It's = clear=20 that it may never become anything worth using, but it's an = interesting=20 exercise nonetheless.   With any luck, it will keep me = busy until=20 someone makes an ideal engine :-)
 
BTW, I found=20 no evidence at all of damage from my missing piece of intake.  I = can't=20 inspect everything through the intake and exhaust ports, but what I can = see=20 looks perfect, and certainly the apex seals are fine.  = There's about a=20 50% chance that the aluminum piece came off after I removed the intake, = since I=20 was trying to break it the rest of the way apart after I got = it off=20 the engine.  I didn't see the missing piece on the workbench, or = floor, but=20 that doesn't mean much either. 
 
Rusty
  
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