X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from nk11p08mm-asmtp001.mac.com ([17.158.58.246] verified) by logan.com (CommuniGate Pro SMTP 6.0.1) with ESMTP id 6068926 for flyrotary@lancaironline.net; Sun, 17 Feb 2013 18:18:39 -0500 Received-SPF: pass receiver=logan.com; client-ip=17.158.58.246; envelope-from=steveizett@me.com Received: from [10.1.1.6] (58-7-247-163.dyn.iinet.net.au [58.7.247.163]) by nk11p08mm-asmtp001.mac.com (Oracle Communications Messaging Server 7u4-26.01(7.0.4.26.0) 64bit (built Jul 13 2012)) with ESMTPSA id <0MIE004HE0PTGPB0@nk11p08mm-asmtp001.mac.com> for flyrotary@lancaironline.net; Sun, 17 Feb 2013 23:17:57 +0000 (GMT) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.9.8327,1.0.431,0.0.0000 definitions=2013-02-17_06:2013-02-15,2013-02-17,1970-01-01 signatures=0 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 ipscore=0 suspectscore=0 phishscore=0 bulkscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=6.0.2-1203120001 definitions=main-1302170265 From: Stephen Izett MIME-version: 1.0 (Apple Message framework v1283) Content-type: multipart/alternative; boundary="Apple-Mail=_B029035D-938C-4437-800B-3CED1F3F6F67" Subject: Re: [FlyRotary] Intake progress Date: Mon, 18 Feb 2013 07:17:52 +0800 In-reply-to: To: Rotary motors in aircraft References: Message-id: X-Mailer: Apple Mail (2.1283) --Apple-Mail=_B029035D-938C-4437-800B-3CED1F3F6F67 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=iso-8859-1 Ed What do you guestimate your HP to be and at what RPM? Cheers Steve Izett On 18/02/2013, at 7:03 AM, Ed Anderson wrote: > Looks good, Charlie >=20 > No welder myself, however when it came time to attach 0.049 wall = aluminum tubing to the cast aluminum stock manifold (see photo = attached), I found a brazing rod for aluminum that worked great. =20 >=20 > Used a butane torch (more BTU/min the better) to first heat the = casting (your plate would be easier) and then brought the flame close to = the tubing - but not playing on the tubing. touched the brazing rod to = the intersection and it did a great job. Been flying for 8 years with = that throttle body (blue half moon) stuck out on the end without any = additional support and still OK. >=20 > Here is the website for the rod I used successfully - before trying = this rod, I probably had 10 lbs or various rods that I never had any = luck with, but this worked. >=20 >=20 > http://www.aluminumrepair.com/ > =20 >=20 > Ed >=20 > -------------------------------------------------- > From: "Charlie England" > Sent: Sunday, February 17, 2013 3:41 PM > To: "Rotary motors in aircraft" > Subject: [FlyRotary] Intake progress >=20 > >=20 > > Now that everyone's awake again, I thought I'd send a pic of my = intake=20 > > progress (RV-7 Renesis with James Lyc cowl). I played with a couple = of=20 > > different materials for the bell mouths. I tried gluing up some 1/4"=20= > > plexi from an old windshield, but used super glue instead of proper=20= > > plexi cement (which I wasn't able to find locally in a hurry). The = 1st=20 > > try popped apart on the lathe; the 2nd turned out ok. Next effort = was=20 > > with 3/4" MDF (medium density fiberboard). That went well, until I = put a=20 > > little too much side pressure on the ring (homemade cutting tool) = after=20 > > undercutting the center section. Overall tube lengths will be ~11 = 3/4"=20 > > block surface to bell ends. The plenum is *much* bigger than most = tuning=20 > > sites recommend. I figure that I can experiment with plenum size by = just=20 > > stuffing it with rigid foam to take up some volume, if needed. Going = the=20 > > other way wouldn't be so easy. :-) > >=20 > > Since I don't have Mark's TIG skills, I thought I'd ask what others = have=20 > > used in joining thin wall tubing to 1/4" aluminum plate. Aluminum=20 > > brazing rod? High temp epoxy? JB weld? I do intend to add bracing = from=20 > > the plate to the plenum assembly to take some of the cantilever &=20 > > vibration stress off the tubes. > >=20 > > I'm using this length and concept because Tracy has had great luck = with=20 > > both HP & BSFC on his Renesis with a similar configuration. However, = I'm=20 > > curious about how others have adapted the common Helmholtz intake = tuning=20 > > formulas to the rotary. Would anyone care to 'show their (math) = work'?=20 > > Renesis users would be better for me, but any calcs would do. When I=20= > > tried to adapt the common formulas to a rotary, I was getting=20 > > 'interesting' results, so I'd like to know if I got lost somewhere = while=20 > > trying to plug rotary 'valve' timing into the formulas. > >=20 > > Charlie > > (Sorry for the sideways iphone pic; I guess you can pretend that = you're=20 > > looking down on it...) > > >=20 >=20 >=20 > > -- > > Homepage: http://www.flyrotary.com/ > > Archive and UnSub: = http://mail.lancaironline.net:81/lists/flyrotary/List.html > > >=20 >=20 >=20 > > ----- > > No virus found in this message. > > Checked by AVG - www.avg.com > > Version: 2013.0.2899 / Virus Database: 2639/6110 - Release Date: = 02/17/13 > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: = http://mail.lancaironline.net:81/lists/flyrotary/List.html --Apple-Mail=_B029035D-938C-4437-800B-3CED1F3F6F67 Content-Transfer-Encoding: 7bit Content-Type: text/html; charset=iso-8859-1 Ed
What do you guestimate your HP to be and at what RPM?

Cheers

Steve Izett
On 18/02/2013, at 7:03 AM, Ed Anderson wrote:

Looks good, Charlie

No welder myself, however when it came time to attach  0.049 wall aluminum tubing to the cast aluminum stock manifold (see photo attached), I found a brazing rod for aluminum that worked great. 

Used a butane torch (more BTU/min the better) to first heat the casting (your plate would be easier) and then brought the flame close to the tubing - but not playing on the tubing.  touched the brazing rod to the intersection and it did a great job.  Been flying for 8 years with that throttle body (blue half moon) stuck out on the end without any additional support and still OK.

Here is the website for the rod I used successfully - before trying this rod, I probably had 10 lbs or various rods that I never had any luck with, but this worked.


http://www.aluminumrepair.com/
 

Ed

--------------------------------------------------
From: "Charlie England" <ceengland7@gmail.com>
Sent: Sunday, February 17, 2013 3:41 PM
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: [FlyRotary] Intake progress

>
> Now that everyone's awake again, I thought I'd send a pic of my intake
> progress (RV-7 Renesis with James Lyc cowl). I played with a couple of
> different materials for the bell mouths. I tried gluing up some 1/4"
> plexi from an old windshield, but used super glue instead of proper
> plexi cement (which I wasn't able to find locally in a hurry). The 1st
> try popped apart on the lathe; the 2nd turned out ok. Next effort was
> with 3/4" MDF (medium density fiberboard). That went well, until I put a
> little too much side pressure on the ring (homemade cutting tool) after
> undercutting the center section. Overall tube lengths will be ~11 3/4"
> block surface to bell ends. The plenum is *much* bigger than most tuning
> sites recommend. I figure that I can experiment with plenum size by just
> stuffing it with rigid foam to take up some volume, if needed. Going the
> other way wouldn't be so easy. :-)
>
> Since I don't have Mark's TIG skills, I thought I'd ask what others have
> used in joining thin wall tubing to 1/4" aluminum plate. Aluminum
> brazing rod? High temp epoxy? JB weld? I do intend to add bracing from
> the plate to the plenum assembly to take some of the cantilever &
> vibration stress off the tubes.
>
> I'm using this length and concept because Tracy has had great luck with
> both HP & BSFC on his Renesis with a similar configuration. However, I'm
> curious about how others have adapted the common Helmholtz intake tuning
> formulas to the rotary. Would anyone care to 'show their (math) work'?
> Renesis users would be better for me, but any calcs would do. When I
> tried to adapt the common formulas to a rotary, I was getting
> 'interesting' results, so I'd like to know if I got lost somewhere while
> trying to plug rotary 'valve' timing into the formulas.
>
> Charlie
> (Sorry for the sideways iphone pic; I guess you can pretend that you're
> looking down on it...)
>



> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/List.html
>



> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 2013.0.2899 / Virus Database: 2639/6110 - Release Date: 02/17/13
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