From: krnet-bounces@mylist.net To: John Bouyea Subject: KRnet Digest, Vol 347, Issue 306 Date: 8/14/2005 9:00:14 PM Send KRnet mailing list submissions to krnet@mylist.net To subscribe or unsubscribe via the World Wide Web, visit http://mylist.net/listinfo/krnet or, via email, send a message with subject or body 'help' to krnet-request@mylist.net You can reach the person managing the list at krnet-owner@mylist.net When replying, please edit your Subject line so it is more specific than "Re: Contents of KRnet digest..." Today's Topics: 1. RE: Gathering hats/shirts (Bob Lee) 2. Weight & Balance (JIM VANCE) 3. Re: Weight & Balance (Mark Langford) 4. Here's lookin at you, Babe (Dan Heath) 5. Re: Here's lookin at you, Babe (Scott Cable) 6. Re: Here's lookin at you, Babe (Ron Smith) 7. (no subject) (Mike Turner) 8. Because We Can! (Barry Kruyssen) 9. Cowling cooling (Colin & Bev Rainey) 10. Re: Here's lookin at you, Babe (jscott.pilot@juno.com) 11. Re: Because We Can! (Dan Heath) 12. Re: Cowling cooling (Steve Eberhart) 13. Re: Cowling cooling (Mark Langford) ---------------------------------------------------------------------- Message: 1 Date: Sun, 14 Aug 2005 07:46:48 -0400 From: "Bob Lee" Subject: RE: KR> Gathering hats/shirts To: "'KRnet'" Message-ID: <001b01c5a0c5$db71b1b0$210c0b0a@bubba9> Content-Type: text/plain; charset="us-ascii" Dan Heath wrote: >> I believe that last year, we could review our registration. Will this be possible this year. I am not sure what I signed up for. << You are correct Dan. I have added a listing of who has ordered what hats and shirts to the pre-registration form on the gathering web site. Go to http://krgathering.org/pre-reg-form.htm and you can see what you have on order. Regards, Bob Lee N52BL KR2 90% done only 62% to go! ------------------------------ Message: 2 Date: Sun, 14 Aug 2005 06:56:27 -0500 From: "JIM VANCE" Subject: KR> Weight & Balance To: "krnet" Message-ID: <001901c5a0c7$6a3f5a40$0700a8c0@oemcomputer> Content-Type: text/plain; charset="iso-8859-1" I weighed my KR-2 yesterday. It was 637 pounds empty. The forward and rearward centers of gravities calculated at 8.28 and 13.25 inches from the leading edge. Are these numbers in the ballpark when using the AS5046 wing? Jim Vance (N303JV) Vance@ClaflinWildcats.com ------------------------------ Message: 3 Date: Sun, 14 Aug 2005 08:33:42 -0500 From: "Mark Langford" Subject: Re: KR> Weight & Balance To: "KRnet" Message-ID: <00d501c5a0d4$ca867ed0$1202a8c0@1700xp> Content-Type: text/plain; charset="iso-8859-1" Jim Vance wrote: > I weighed my KR-2 yesterday. It was 637 pounds empty. The forward > and rearward centers of gravities calculated at 8.28 and 13.25 inches from the leading edge. > Are these numbers in the ballpark when using the AS5046 wing? Yes. The CG range for the AS5046 is basically the same as the RAF48, and since RR says the CG range is 8"-16" aft of the leading edge, you are fine. Most prudent people will avoid the aft 2" of that range, which makes the range 8"-14", so you're still just fine. Good job! Mark Langford, Huntsville, Alabama see KR2S project N56ML at http://home.hiwaay.net/~langford email to N56ML "at" hiwaay.net -------------------------------------------------------------- ------------------------------ Message: 4 Date: Sun, 14 Aug 2005 10:59:10 -0400 (Eastern Daylight Time) From: "Dan Heath" Subject: KR> Here's lookin at you, Babe To: Message-ID: <42FF5C3E.000021.04000@DANHOMECOMPUTER> Content-Type: Text/Plain; charset="iso-8859-1" I am getting ready to do the filling and sanding on the cowling. It was so hot in the Airplane Factory, that I decided to take a break and show you these latest pics of the last task to be done on the WannaBee. Once the Surgery for the fuel tank problems has completely healed ( been repainted ), the WannaBee will head to the airport. That date is September 1, 2005 as of this writing. I have been subletting my hangar for many years and the current tenant will be moving to a new hangar on that date, so it will work out well. Even if the cowling is not completely finished, that date will still stand. I hope we can have the inspection on the Wednesday before I leave for the gathering. That might be stretching it, bit it is worth a try If you want to see the pics, go to http://kr-builder.org/Cowl/index.html They are the first 7 pics and as always, you can click on any pic for a larger view. See you in Mt. Vernon - 2005 - KR Gathering See N64KR at http://KR-Builder.org - Then click on the pics There is a time for building and a time for FLYING and the time for building has expired. Daniel R. Heath - Columbia, SC ------------------------------ Message: 5 Date: Sun, 14 Aug 2005 13:00:06 -0700 (PDT) From: Scott Cable Subject: Re: KR> Here's lookin at you, Babe To: KRnet Message-ID: <20050814200007.98354.qmail@web53001.mail.yahoo.com> Content-Type: text/plain; charset=iso-8859-1 Dan, Something occurred to me as I was looking at your cowl pictures. You stated that the outbd sides of the slot-scoop are going to provide cooling air to the bottom of the engine. If you do that, won't that cause air to stagnate inside the cowling and overheat the engine? The cooling air from the upper openings behind the prop is high pressure. By allowing high pressure air to the bottom of the engine, haven't you effectively shut off the flow of air? To achieve proper cooling, you'll need high pressure / volume air at the top / front of the engine flowing into a low pressure area below and aft of the engine. In other words, you're needing a pressure differential to achive flow. I think that maybe you should block off the lower side openings and use the scoop only for carb air, or at least be prepared to do that during flight testing. Dan Heath wrote: If you want to see the pics, go to http://kr-builder.org/Cowl/index.html They are the first 7 pics and as always, you can click on any pic for a larger view. Scott Cable Jamestown, ND s2cable1@yahoo.com --------------------------------- Yahoo! Mail Stay connected, organized, and protected. Take the tour ------------------------------ Message: 6 Date: Sun, 14 Aug 2005 16:35:28 -0700 (PDT) From: Ron Smith Subject: Re: KR> Here's lookin at you, Babe To: KRnet Message-ID: <20050814233528.4325.qmail@web81701.mail.yahoo.com> Content-Type: text/plain; charset=iso-8859-1 It is hard to tell what he did from the pictures, but if ram air is allowed into the cowling below the baffling that is not a good thing. Scott is right, depending on how much air is let in the pressure diferential could become 0..........but like I said it's hard to tell from the pics. Ron Smith Kr2ssxl Cypress Ca U.S.A. mercedesmann@yahoo.com http://ronsmith.myphotoalbum.com/albums.php ------------------------------ Message: 7 Date: Sun, 14 Aug 2005 18:53:31 -0500 From: "Mike Turner" Subject: KR> (no subject) To: "krnet" Message-ID: Content-Type: text/plain; charset="iso-8859-1" Is the KR net quiet or is something wrong with my computer? I'm only getting around 3 or 4 a day. Mark, how many days? Can't wait!! Mike Turner Jackson, MO Spin the prop, light the fire, dance among the stars..............N642MC ------------------------------ Message: 8 Date: Mon, 15 Aug 2005 10:01:28 +1000 From: "Barry Kruyssen" Subject: KR> Because We Can! To: "KRnet" Message-ID: <001c01c5a12c$7d7eebb0$5600a8c0@technologyonecorp.com> Content-Type: text/plain; charset="iso-8859-1" Hi, Flight Report for 13 August 2005: We have had weeks of less than average weather. Friday night weather forecast said the weekend was going to be fine (yes sure....). Got up Saturday morning to the best weather for ages, no breeze or clouds and about 14 degrees C. Went back in to bed room and said to my wife, Gail, "Weathers good, I've never been to Chillagoe, you wan'a come". So we get ready and are walking out to the car, as we go past my daughter, Sarah's bedroom window. She asks " Where you going?" and I reply "Chillagoe". She then asks "Why?" and I answer "Because we can!". Chillagoe is and old gold mining town surrounded by limestone caves and recently, marble mines. It is 64 miles, bearing 277 degrees true, from my home airport of Atherton, in north Queensland, Australia. Atherton airport is 2450 ft, Chillagoe airport is 1100 ft. 40% of the trip is over "Tiger" country with on one landing option, the Walsh river. It is a 4+ hour drive by car over dirt roads (the road goes around the "Tiger" country). We arrive at the airport as a friend of mine, Brian, is getting out his Jabiru J160 with a 2200, 85 HP engine (same engine as I have). He decides to join us and heads of about 8 minutes before us as his cruise is about 110 kts. We agreed on a 6500 ft cruise over the "Tiger" country. As I'm over pitched on the prop, the climb out 2 up is very ordinary, but we are at 5500 ft 10 miles out from Atherton to clear the first small mountain range. We maintain 5500 ft (I get better fuel economy down low) till the "Tiger" country where we climb to 6500 ft. We caught up to the J160 at 15 miles out from Chillagoe just as he was starting his decent to circuit height. We decide to let him land first, so we open the throttle and descend at 160 kts in the still air to arrive at Chillagoe with enough time to do a little blast around the town and surrounding area. There is about 5 kts on the ground but it is all over the place swing through 100 + degrees (who cares!). Final approach is over trees and the Walsh river and as we cross the rive we find our first turbulence for the trip (again, who cares!). Touch down is aimed at just before the wind sock which all of a sudden swing so I gave cross wind landing with a slight tail wind factor but the wind sock at the other end is pointing straight down the strip at me (again, who cares!). I decide to still land but get dumped on to the strip and have to really work to stay straight (who cares! my wife really cares!) but no problems and we taxi off to the parking ramp. I turns out I was landing in a "Willy Willy" (a very, very small tornado, the starting of a thermal, etc), I probably should have gone round :-). We a little walk round and decided next time to bring walking shoes and make a day of it. We soon departed and the return trip was a bit lumpy till we got above 4000 ft where it all smoothed out, Gail and I took a different tack home skirting to the south of the Mountain range near Atherton. We packed up the KR2 and were back home by midday in time for Gail to run William to soccer and me to help Sarah with her homework. Later in the day I went back to the airport and replaced the single wire $30 aerial with a Comant CI 121 aerial. What an improvement that made, 400% better reception. Barry Kruyssen Cairns, Australia RAA 19-3873 kr2@BigPond.com http://www.users.bigpond.com/kr2/kr2.htm ------------------------------ Message: 9 Date: Sun, 14 Aug 2005 20:03:39 -0400 From: "Colin & Bev Rainey" Subject: KR> Cowling cooling To: Message-ID: <004801c5a12c$ca88c0c0$3a412141@RaineyDay> Content-Type: text/plain; charset="iso-8859-1" The other alternative would be to open up the openings underneath and use the already high pressure air being forced under the cowling to assist in being drawn into the cowling, and install vents near the firewall baffles, closing off the openings in the front behind the prop. If you look at the illustrations of the areas of pressure as shown on Mark Langford's site you will see how the high pressure zones are all over the bottom of the cowling giving a natural ram cooling effect. Robert Finch also talks about how this was very successful in Jess Meyers' first efforts with the 4.3 V6 in the RV6, and also a Jaguar homebuilt. By baffling at the bottom of the engine and forcing up through the heads reversed, you might even increase the aerodynamics some by smoothing the area right behind the prop where it is so blunt and allowing a more streamlined scoop vent on the bottom. Food for thought... Colin Rainey Sanford, FL N96TA ------------------------------ Message: 10 Date: Sun, 14 Aug 2005 18:02:01 -0600 From: jscott.pilot@juno.com Subject: Re: KR> Here's lookin at you, Babe To: krnet@mylist.net Message-ID: <20050814.180202.2604.0.jscott.pilot@juno.com> Content-Type: text/plain; charset=us-ascii Scott, While your point is correct, the air inlet below the prop is fairly common. Check out many of the older Continental powered airplanes. Champs, Taylorcrafts and Ercoupes come to mind. They have a slot just under the prop to allow cooling air to the bottom of the engine and oil tank. The winterization kit is to cover the opening. In my Continental powered KR, I intentionaly spill air above the air box for oil cooling. However, if you are going to allow cooling air under the engine, you do have to have a little more exit area to produce a more negative area to augment the cylinder cooling. Jeff Scott On Sun, 14 Aug 2005 13:00:06 -0700 (PDT) Scott Cable writes: > Dan, > Something occurred to me as I was looking at your cowl pictures. You > stated that the outbd sides of the slot-scoop are going to provide > cooling air to the bottom of the engine. If you do that, won't that > cause air to stagnate inside the cowling and overheat the engine? The > cooling air from the upper openings behind the prop is high pressure. > By allowing high pressure air to the bottom of the engine, haven't you > effectively shut off the flow of air? To achieve proper cooling, > you'll need high pressure / volume air at the top / front of the > engine flowing into a low pressure area below and aft of the engine. > In other words, you're needing a pressure differential to achive flow. > I think that maybe you should block off the lower side openings and > use the scoop only for carb air, or at least be prepared to do that > during flight testing. > > Dan Heath wrote: > If you want to see the pics, go to > http://kr-builder.org/Cowl/index.html > They are the first 7 pics and as always, you can click on any pic > for a > larger view. > > > > > Scott Cable > Jamestown, ND > s2cable1@yahoo.com ------------------------------ Message: 11 Date: Sun, 14 Aug 2005 20:10:04 -0400 (Eastern Daylight Time) From: "Dan Heath" Subject: Re: KR> Because We Can! To: Message-ID: <42FFDD5C.000003.00180@DANHOMECOMPUTER> Content-Type: Text/Plain; charset="iso-8859-1" Some guys have all the fun. Thanks for sharing that experience. See you in Mt. Vernon - 2005 - KR Gathering See N64KR at http://KR-Builder.org - Then click on the pics There is a time for building and a time for FLYING and the time for building has expired. Daniel R. Heath - Columbia, SC ------------------------------ Message: 12 Date: Sun, 14 Aug 2005 21:02:27 -0500 From: Steve Eberhart Subject: Re: KR> Cowling cooling To: KRnet Message-ID: <42FFF7B3.4030509@newtech.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Colin & Bev Rainey wrote: > The other alternative would be to open up the openings underneath and > use the already high pressure air being forced under the cowling to > assist in being drawn into the cowling, and install vents near the > firewall baffles, closing off the openings in the front behind the > prop. If you look at the illustrations of the areas of pressure as > shown on Mark Langford's site you will see how the high pressure zones > are all over the bottom of the cowling giving a natural ram cooling > effect. Robert Finch also talks about how this was very successful in > Jess Meyers' first efforts with the 4.3 V6 in the RV6, and also a > Jaguar homebuilt. By baffling at the bottom of the engine and forcing > up through the heads reversed, you might even increase the > aerodynamics some by smoothing the area right behind the prop where it > is so blunt and allowing a more streamlined scoop vent on the bottom. > Food for thought... I think you might actually be able to achieve more efficient cooling with an updraft approach. I have sketches of similar solutions but I was never able to come up with a solution to what happens to the oil from an oil leak. Cooling air exiting on the bottom of the plane carries the oil out there. Updraft cooling, with exits in the low pressure area just in front of the canopy, deposits the oil on the canopy. Not good. Steve Eberhart ------------------------------ Message: 13 Date: Sun, 14 Aug 2005 21:35:23 -0500 From: "Mark Langford" Subject: Re: KR> Cowling cooling To: "KRnet" Message-ID: <01a101c5a141$fce15860$1202a8c0@1700xp> Content-Type: text/plain; charset="iso-8859-1" Steve Eberhart wrote: >Updraft cooling, with exits in the low > pressure area just in front of the canopy, deposits the oil on the >canopy. Not good. If you were an optimistic guy like me (yeah, right) you'd think of the oil mist on the windshield as an early warning of a leak that you could fix before it got really bad, and therefore a plus, rather than a minus! I mean, what are the chances of a sudden oil hose failure? That would almost never happen, sort of like a broken crankshaft! I noticed you were signed up for the Gathering. It'll be good to see you again. I hope a bunch of folks make it this year. It's really become a time and place to get together with old friends that have a lot in common. It'll be close for me, but I'll get there. Just don't expect much more than what my plane looked like 3 months ago. The only thing I've changed is the engine. Today's photo is at http://home.hiwaay.net/~langford/corvair/95hp/05081455m.jpg ... Mark Langford, Huntsville, Alabama see KR2S project N56ML at http://home.hiwaay.net/~langford email to N56ML "at" hiwaay.net -------------------------------------------------------------- ------------------------------ _______________________________________________ See KRnet list details at http://www.krnet.org/instructions.html End of KRnet Digest, Vol 347, Issue 306 *************************************** ================================== ABC Amber Outlook Converter v4.20 Trial version ==================================