Return-Path: <13brv3@bellsouth.net> Received: from imf20aec.mail.bellsouth.net ([205.152.59.68] verified) by logan.com (CommuniGate Pro SMTP 4.2b5) with ESMTP id 141880 for flyrotary@lancaironline.net; Sun, 06 Jun 2004 16:01:03 -0400 Received: from rad ([65.6.194.9]) by imf20aec.mail.bellsouth.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with ESMTP id <20040606200032.RDIM18130.imf20aec.mail.bellsouth.net@rad> for ; Sun, 6 Jun 2004 16:00:32 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] magic plenum gets wet Date: Sun, 6 Jun 2004 14:58:32 -0500 Message-ID: <011701c44c00$a55ddec0$6001a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0118_01C44BD6.BC87D6C0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_0118_01C44BD6.BC87D6C0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Also, for my information, I would be interested in the volume of your = plenum as well as the length and diameter of the hoses from plenum to throttle body. =20 =20 Thanks to Tommy, and Ed for the comments. =20 =20 Ed, I've made a note to verify the sceet tubing length, though I can = give a pretty good estimate of 9" from the TB to the plenum. The sceet is = 1.75" ID. The TB is 15" from the face of the iron housing port. The plenum itself started as a rectangular block of foam, 8" front to rear, 5" left = to right, and 3" top to bottom. The front side was angled off 45 degrees downward, as you can see in the pics. The rear, right corner was = rounded, also as you can see. That was the only real shaping, aside from = generally rounding the corners that didn't have flanges attached. BTW, Spruce = sells handy aluminum flanges in just about any size you want. =20 =20 I managed a brief flight today, and established some important fact, = such as where the water comes in when it's raining (pretty much everywhere, = since I haven't put any weather-stripping on the canopy), and the best position = for a drain hole in my oil cooler scoop (big puddle of water in there). It = was the typical FL Summer day, with a few scattered showers around, but it looked fine for a local flight. As I taxied out, there were a few drops = of rain, and I could see a dark cloud, but no lightning or wind to speak = of. I proceeded to take off, and the rain got harder until I could turn to the East. This silly cloud was sitting right over the airport, but I could = also see some heavy rain approaching, so after a few laps, I decided to land before it got much worse. On descent, the engine was rich, since I = haven't done anything with the dual MAP, but I didn't fiddle with it much, since = it was still running OK, and I was at pattern altitude in what was now = fairly heavy rain. The landing was uneventful, but the rain really started to = come down as I taxied back to the hanger. =20 =20 There's a lot of debate between RV guys about canopy types, tip up, tip over, or sliders, but one thing's common to all, if you get in or out in = the rain, you, and the inside of the plane are going to get wet. Of course = I was wearing the chute today, so it's a little harder to get in and out, = so it's soaked now too. The tropical storm type rain was still going on = about an hour later, so I just left. =20 =20 So, how was the climb you ask. Naturally, it wasn't an extensive test, = but with full fuel, and rain if that counts for anything, I saw an easy 1500 = fpm at 5250 rpm, and 120 mph. I'm sure I could have got more out of it, but = I just didn't have time to do any real testing. Even from this brief = flight, I'm convinced that all is well with this intake, and aside from some = more tuning, I'll be in good shape for Rev-3 (C drive and monster prop). =20 =20 Cheers, Rusty (a little soggy) =20 =20 =20 ------=_NextPart_000_0118_01C44BD6.BC87D6C0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
Also, for my information, I would be = interested in=20 the volume of your plenum as well as the length and diameter of the = hoses from=20 plenum to throttle body.
 
 
Thanks to=20 Tommy, and Ed for the comments. 
 
Ed, I've made=20 a note to verify the sceet tubing length, though I can give a = pretty=20 good estimate of 9" from the TB to the plenum.   The sceet=20 is 1.75" ID.  The TB is 15" from the face of the iron housing=20 port.  The plenum itself started as a rectangular block of foam, 8" = front=20 to rear, 5" left to right, and 3" top to bottom.  The front side = was angled=20 off 45 degrees downward, as you can see in the pics.  The rear, = right=20 corner was rounded, also as you can see.  That was the only real = shaping,=20 aside from generally rounding the corners that didn't have flanges=20 attached.  BTW, Spruce sells handy aluminum flanges in = just about=20 any size you want. 
 
I managed a=20 brief flight today, and established some important fact, such as where = the water=20 comes in when it's raining (pretty much everywhere, since I haven't put = any=20 weather-stripping on the canopy), and the best position for a drain hole = in my=20 oil cooler scoop (big puddle of water in there).  It was the = typical FL=20 Summer day, with a few scattered showers around, but it looked fine for = a local=20 flight.  As I taxied out, there were a few drops of rain, and = I could=20 see a dark cloud, but no lightning or wind to speak of.  I = proceeded to=20 take off, and the rain got harder until I could turn to the = East. =20 This silly cloud was sitting right over the airport, but I could also = see some=20 heavy rain approaching, so after a few laps, I decided to land before it = got=20 much worse.  On descent, the engine was rich, since I = haven't=20 done anything with the dual MAP, but I didn't fiddle with it much, = since it=20 was still running OK, and I was at pattern altitude in what was now = fairly heavy=20 rain.  The landing was uneventful, but the rain really started to = come down=20 as I taxied back to the hanger.  
 
There's a lot=20 of debate between RV guys about canopy types, tip up, tip over, or = sliders, but=20 one thing's common to all, if you get in or out in the rain, you, = and the=20 inside of the plane are going to get wet.  Of course I was = wearing the=20 chute today, so it's a little harder to get in and out, so it's soaked = now=20 too.  The tropical storm type rain was still going on about an hour = later,=20 so I just left.  
 
So, how was=20 the climb you ask.  Naturally, it wasn't an extensive test, but = with full=20 fuel, and rain if that counts for anything, I saw an easy 1500 fpm at = 5250 rpm,=20 and 120 mph.  I'm sure I could have got more out of it, but I just = didn't=20 have time to do any real testing.  Even from this brief flight, I'm = convinced that all is well  with this intake, and aside from some = more=20 tuning, I'll be in good shape for Rev-3 (C drive and monster=20 prop).   
 
Cheers,
Rusty (a=20 little soggy)  
 
 
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