by Npt.NUWC.Navy.Mil (PMDF V5.0-7 #13155) id <01ICJCV198SU94DNPM@Npt.NUWC.Navy.Mil> for cozy_builders@hpwarhw.an.hp.com; Mon, 02 Dec 1996 14:13:46 -0500 (EST) (4.1/SMI-4.1) id AA06994; Mon, 02 Dec 1996 14:13:02 -0500 (EST) Date: Mon, 02 Dec 1996 14:13:02 -0500 (EST) From: triley@c38fs0.npt.nuwc.navy.mil (Tom Riley) Subject: COZY: Landing Gear Fairings Hi All, Just finished installing the landing gear. I know I'm a bit ahead of myself, but can anyone direct me to where I can find directions in the MKIV Plans on how to build the landing gear fairings? I know there have been a couple of email tips on various methods to do this, but I would like to see how Nat proposes to do it, and I couldn't find it anywhere in the plans. Can anyone direct me to where I can find this? Thanks, Tom Riley MKIV, S/N 113, Ch 9 From: Marc J. Zeitlin Subject: COZY: Landing Gear Fairings (fwd) Date: Mon, 2 Dec 96 16:50:22 EST > >Hi All, > > Just finished installing the landing gear. I know >I'm a bit ahead of myself, but can anyone direct me >to where I can find directions in the MKIV Plans on >how to build the landing gear fairings? Well, Chapter 24 is "Installing Covers and Fairings", so if it's not in there........ :-). I don't remember seeing them while skimming ahead, but that may not mean anything :-). I bought the fairings from AeroCad - I'll have to massage them to fit on my fuselage/gear junction, but they're a decent start. -- Marc J. Zeitlin Email: marcz@an.hp.com Date: Mon, 02 Dec 1996 23:34:49 +0000 From: Jnik Subject: Re: COZY: Landing Gear Fairings Edmond A. Richards wrote: > > Tom Riley writes; > > can anyone direct me > to where I can find directions in the MKIV Plans on > how to build the landing gear fairings? > > I went through the same thing and have still not found any reference to "how Nat > expects this to be done" in the plans. At first I was very surprised and about > couldnt believe there was no instructions on how to do this. But as you move > through the project you will find MANY other details that are "left to the > builders discretion". Thats one of the things that makes this forum so > helpful, it provides answers many of the common questions. > > I added glass and foam to fuselage and the gear cover to form a fairing around > the gear leg and I thought it looked pretty good at the time. However I will > probably need to replace or modify the fairing, as the position of the leg with > respect to the fuselage changes as you add weight (such as the engine). I would > recommend waiting until near the end of the project before adding the fairings > to the gear legs. > > For what its worth. > > Ed Richards One of the things that I question is the need for farings at all. Given the place where the landing gear comes out of the fuselage I am not sure as to what is gained by putting a faring there. According to Horner as shown in the book Fluid Dynamic Drag, since the fuselage at the point where the legs exit is basically straight and not rapidly decreasing in size and the legs of the landing gear exit at the corner of the fuselage none of the criterion are met that would indicate a reduction in drag by the addition of a faring. It appears to me a small radius junction, something on the order of 1/4 inch, would be all that is needed to achieve minimum drag. Am I missing something? Maybe I got this wrong? Maybe I am missing something in my interpretation of the plans. For those interested, the material is in chapter eight titled Interference Drag, of the "bible" on drag entitled Fluid Dynamic Drag by S.F. Hoerner. To summarize, the leg does not make an angle less than ninty degrees to the sides of the fuselage, and the fuselage is not decreasing in cross sectional area at the point where the legs exit. Since neither of these criterion are met, the best that can be achieved is to make the gear legs shape optimal. No other faring is needed. At least that is how I interpret the research presented. John Meernik Date: 02 Dec 96 21:59:09 EST From: "Edmond A. Richards" <103235.1336@compuserve.com> Subject: Re: COZY: Landing Gear Fairings Tom Riley writes; can anyone direct me to where I can find directions in the MKIV Plans on how to build the landing gear fairings? I went through the same thing and have still not found any reference to "how Nat expects this to be done" in the plans. At first I was very surprised and about couldnt believe there was no instructions on how to do this. But as you move through the project you will find MANY other details that are "left to the builders discretion". Thats one of the things that makes this forum so helpful, it provides answers many of the common questions. I added glass and foam to fuselage and the gear cover to form a fairing around the gear leg and I thought it looked pretty good at the time. However I will probably need to replace or modify the fairing, as the position of the leg with respect to the fuselage changes as you add weight (such as the engine). I would recommend waiting until near the end of the project before adding the fairings to the gear legs. For what its worth. Ed Richards Date: Tue, 3 Dec 1996 10:31:22 -0500 From: CozyBldr@aol.com Subject: Re: COZY: Landing Gear Fairings In a message dated 96-12-02 14:35:25 EST, Tom Riley writes: << Just finished installing the landing gear. I know I'm a bit ahead of myself, but can anyone direct me to where I can find directions in the MKIV Plans on how to build the landing gear fairings? I know there have been a couple of email tips on various methods to do this, but I would like to see how Nat proposes to do it, and I couldn't find it anywhere in the plans. Can anyone direct me to where I can find this? >> I asked the same question of Nat a while back. He knew he had written it up somewhere but couldn't remember where. I later found it in newsletter 36, page 4. Paul Stowitts Cozy Mark IV #200 Date: Tue, 3 Dec 1996 09:47:53 -0600 From: johnw@daktel.com Subject: Re: COZY: Landing Gear Fairings >I know there have been a couple of email tips on various methods to do this, but I would like to see how Nat proposes to do it, and I couldn't find it anywhere in the plans.< If my memory serves me correctly, I believe that in one of Nat's newsletters he decribed how he used Play-Dough to form the flairings and then dug it out after the cure. I hope this helps. :-) John Williams Heaton, ND "The fuel for mans flight is knowledge"