Mark - I'm not an A&P but you may be referring to Vaughan Askue's "Flight Testing Homebuilt Aircraft" (Iowa State University Press) he has a chapter on Pitot-Static systems and on pg. 124 talks about placing "Dams" around the static ports for corrections - the dams only have to .010" high and one in front of the port will increase the indicated airspeed, behind will reduce the indicated airspeed. Rotating the dam will bias the effect allowing you to "tune" the airspeed. Maybe that's why the "hour glass" on the certified product.
----- Original Message ----- From: "Mark Langford" <n5...@hiwaay.net> To: "KRnet" <kr...@mylist.net> Sent: Sunday, May 29, 2005 7:06 PM Subject: KR> static port correction? > Could one of you A&P types (or anybody else that knows) answer something for me? My static system is off a tad, and I've read somewhere that you can adjust the static port to compensate for either low or high pressure areas by locating a block or bump or something either in front of or behind the port (sort of like the o-ring trick on a static tube). Since my static ports are located back on the fuseage between wing and tail, I assume they are in a low pressure area, and therefore the block should be behind the hole, but somebody is welcome to correct me. I've done that with some welding rod and tape (see http://home.hiwaay.net/~langford/05052901m.jpg , and the holes are punched out through the tape), but my new buddy the A&P says he's seen an "official" hour glasses shape block on a static port before, presumably for the same purpose. He admitted to not being an expert, however. A squarish block would be more effective, if the error is that great. I guess what I'm asking is are there any guidelines as > I'd like for the airpseed and altimeter (as well as transponder encoder) to be a little closer to correct next time I fly it, if possible. In other news, I did some work on the plane today and freed up a slightly binding aileron, among other things, so it's just about ready to fly again, but the weather is going to stink for the next week or so. Bill Clapp will probably not make it due to the weather, so I'm studying landing procedures in hopes of handling it myself... > > Thanks, > > Mark Langford, Huntsville, Alabama > see KR2S project N56ML at http://home.hiwaay.net/~langford > email to N56ML "at" hiwaay.net > -------------------------------------------------------------- > > _______________________________________ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html >
