X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail07.syd.optusnet.com.au ([211.29.132.188] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTPS id 2551330 for flyrotary@lancaironline.net; Sat, 01 Dec 2007 20:26:31 -0500 Received-SPF: none receiver=logan.com; client-ip=211.29.132.188; envelope-from=lendich@optusnet.com.au Received: from george (d58-108-72-98.dsl.nsw.optusnet.com.au [58.108.72.98]) by mail07.syd.optusnet.com.au (8.13.1/8.13.1) with SMTP id lB21PkSx017947 for ; Sun, 2 Dec 2007 12:25:47 +1100 Message-ID: <000f01c83482$45c413d0$62486c3a@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Giving up on single rotor Date: Sun, 2 Dec 2007 11:25:48 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000C_01C834D6.16868720" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Antivirus: avast! (VPS 0657-0, 12/12/2006), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_000C_01C834D6.16868720 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageRusty, I'm with you 100%. So what durometer is your gut feeling now that you went this far? The 16X looks good for a single development, that's only 5 years away. = If you keep working on it, you should have all the problems sorted by = then - no not joking! George (in for the long haul - down under) What was the latest problem with the single development, was it the = torsional reversals. The last I heard was you were going softer with the = damper material - did that work out?=20 Hi George, The last straw was the new damper arrangement. Going from a 60 = durometer to a 50 durometer made some difference. I then hacked up one = of the 60 durometer dampers so it would be softer, and have more flex. = With that one, I felt like the problem was gone. =20 After some thought (staring it into submission), I figured out a way = to make a steel adapter to allow me to couple two 50 durometer dampers = in series, and still fit where it needed to go. After spending almost a = week working on it, and being very proud of what I was able to make on = my home 3-in-1 machine, I finally gave it a try. Unfortunately, it = wasn't good. =20 This was a classic case of "if a little more is good, then a lot more = will be great". I ended up with a damper that was so soft, and had so = much play that it was like a rubber band. The result was almost as = scary as that wacky peroxide rotorcraft video I posted. The engine = almost tore my test stand apart before I could shut it down, and I'm = probably lucky it didn't chop me to bits just for spite. I had the = video running, but all I got was "memory card error" when I tried to = view it. =20 While this damper didn't work out as planned, there are still other = solutions I could try, and I'm sure it's possible to make this work. = Unfortunately, I've already spent almost 3 years (time flies) messing = with this, and there's just no escaping the fact that it's going to be = too heavy to be a 912S replacement. Until someone manufactures a better = 100 HP rotary solution (two rotor I hope), that they are actually = willing to sell for aircraft use, I'm afraid the 100 HP rotary isn't = going to be much of an option. The 912S so desperately needs = competition... Rusty (UAVP) =20 -------------------------------------------------------------------------= ----- No virus found in this incoming message. Checked by AVG Free Edition.=20 Version: 7.5.503 / Virus Database: 269.16.11/1161 - Release Date: = 30/11/2007 12:12 PM ------=_NextPart_000_000C_01C834D6.16868720 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Rusty,
I'm with you 100%.
So what durometer is your gut feeling = now that you=20 went this far?
The 16X looks good for a single = development, that's=20 only 5 years away. If you keep working on it, you should have all the = problems=20 sorted by then - no not joking!
George (in for the long haul - down=20 under)
What was the latest problem with the single development, was it = the=20 torsional reversals. The last I heard was you were going softer with = the=20 damper material - did that work out? 
 
Hi=20 George,
 
The last=20 straw was the new damper arrangement.  Going from a 60 durometer = to a 50=20 durometer made some difference.  I then hacked up one of the 60 = durometer=20 dampers so it would be softer, and have more flex.  With = that one,=20 I felt like the problem was gone. 
 
After=20 some thought (staring it into submission), I figured out a way to = make a=20 steel adapter to allow me to couple two 50 durometer dampers in = series, and=20 still fit where it needed to go.  After spending almost a week = working on=20 it, and being very proud of what I was able to make on my home 3-in-1 = machine,=20 I finally gave it a try.  Unfortunately, it wasn't=20 good.  
 
This was a=20 classic case of "if a little more is good, then a lot more will be=20 great".  I ended up with a damper that was so soft, and had so = much play=20 that it was like a rubber band.  The result was almost = as scary=20 as that wacky peroxide rotorcraft video I posted.  The = engine almost=20 tore my test stand apart before I could shut it down, and I'm = probably=20 lucky it didn't chop me to bits just for spite.  I had = the video=20 running, but all I got was "memory card error" when I tried to view=20 it.  
 
While=20 this damper didn't work out as planned, there are still other = solutions I=20 could try, and I'm sure it's possible to make this work.  =20 Unfortunately, I've already spent almost 3 years (time flies) messing = with=20 this, and there's just no escaping the fact that it's going to be too = heavy to=20 be a 912S replacement.  Until someone manufactures a better = 100 HP=20 rotary solution (two rotor I hope), that they are actually = willing to=20 sell for aircraft use, I'm afraid the 100 HP rotary isn't going to be = much of=20 an option.  The 912S so desperately needs=20 competition...
 
Rusty=20 (UAVP)  

No virus found in this incoming message.
Checked by AVG Free = Edition.
Version: 7.5.503 / Virus Database: 269.16.11/1161 - = Release Date:=20 30/11/2007 12:12 PM
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