Pietenpol-List: webinar

[matronics]

Original Posted By: Steven Dortch
Good luck, Jim!FYI...I just changed my tailwheel design. Old tailwheel, with BHP A frame, weighedabout 4 lbs. New set up, with spring and 6" wheel weighs 9 lbs. The math saysthat CG changed little.Gary BootheNX308MBSent from my iPhone> On Oct 9, 2013, at 1:05 PM, "Fun2av8" wrote:> > > Hey Guys,> > As I sit out at the hangar (KCJR) it is a kinda miserable day all cloudy andits drizzling. Gotta tell ya just dont care! The Culpeper Air Fest is thiscoming Saturday. The war birds are starting to arrive. Many are getting intheir formation practice. Rumor has it we will have over 60 Texans on the rampand in the air on Saturday. Im throwing a Hangar Party all day (if your localsend me an email -- come on down !!!). > > With all this talk about W&B, CG, Datum lines, and other such elusive mysteries,I kinda feel like weve been around the barn and down the rabbit hole a bunchof times. Some really great info and thoughts came out of all of this.> > I totally lost focus on what started this. What started this ruckus was thediscussions about upgrading my tail wheel from the roller skate to an 8 Scott3200. There were thoughts on both sides pro and con. What stuck with me isthat the Scott 3200 weighs 6 pounds and the roller skate weights less than a pound.Then there were thoughts expressed that Piets are typically tail heavyany way and that adding 5 pounds more to the tail would be a big deal.> > So I figured Id just do the math and see what the calculated effect of this additionalweight would be with respect to the CG. I knew that the Datum was keyto all of this> > Then it was off to the races . Measuring stations and compiling data. I gotso wrapped up (Yes, I was having lots of fun!) in the process that I lost sightof the goal. OMG I was up till ODark-Thirty still crunching numbers. Thankfullymy PC does an automatic shutdown forced me to go to bed. > > Lots of folks chimed in with their Piet specific CG data. No two Piets had thesame data. The CG ranges were interesting. But, since no two Piets are builtexactly alike it just makes sense that the CG data would be different.> > The Datum is arbitrary the Builder decides where he or she wants it to be .For most Piets, but not all Piets - the Datum is the LE of the Wing. It turnsout that that might NOT be the case for my Piet. Page 1 of the plans used tobuild Mr. Sam say that there is a mystery vertical line 9 ahead of the LE.The Wing, Struts, and main gear are situated based on a specific distance fromthis line. But thenIm guessing that this mystery line is the Datum. No onewrote Datum and drew an arrow to this line. So technically . I still dont know.> > As I mentioned before It was off to the races logic and reason be damned Imgonna prove where my CG is Well if you look at the previous posts and attachmentsyou can see I had a lot of fun creating spreadsheets with pictures andarrows all over the place just like Alices Restaurant. Oscar must be a lotlike me . I suspect he has a few pictures with arrows as well. His detailed instructionson how to do the measure and weigh the Piet are incredibly well writtenand spot on! Im gonna do just that. I even ordered two 550 pound bathroomscales for less than $80 with shipping. > > So with all of this hurry scurry and rustling of papers, quivers, and arrows. I still dont know what the mathematical impact of adding 5 pounds to the tailwill be. I suppose I could just tie a 5 pound rock to the tail and ask Chuckif he wants to go flying Wouldnt that be a hoot.> > Truth: Mr. Sam flies well. I dont have any nose or tail heavy issues. Lifeis good. Gonna go watch the war birds fly. I wonder.If I took off wouldthey join up on me in formation? Ha Ha Ha . Fat chance!> > P.S. Gonna go with the Scott 2000 ...... No Sweat!!!> > --------> Jim McWhorter> N687MB (New Owner)> Culpeper, VA KCJR> > > > > Read this topic online here:> > http://forums.matronics.com/viewtopic.p ... 157#410157> > > > > > > > > > ________________________________________________________________________________Date: Wed, 9 Oct 2013 21:02:06 -0500Subject: Pietenpol-List: webinar

[matronics]

Original Posted By: "taildrags"
Paul; it's looking nice. Do you plan to bead-blast and powder coat it after youget all the fittings and tabs installed, or will you just go with primer and/orpaint? I don't know about powder coating but it seems to me that if you needto add a tab or fitting after you've powder-coated, you won't be able to getthe same finish on the added parts that you have on the powder-coated restof the thing.--------Oscar ZunigaMedford, ORAir Camper NX41CC "Scout"A75 powerRead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: webinar

[matronics]

Original Posted By: Steven Dortch
Bill!Thank for pointing that out. I shoulda figured that out...duh! Thanks to a tip from Zeke, I googled Michael Brusilow and stumbled upon the MatronicsArchives that has all his posts. Been reading them for hours. Learned so much about my Piet. Yes, it is the long fuse. Yes, the wings were shifted back 3.5". And the CG is 14.5 inches aft of the LE.And now I know what those 4 holes in the front cockpit floorboard are for.Color me a happy camper!--------Jim McWhorterN687MB (New Owner)Culpeper, VA KCJRRead this topic online here:http://forums.matronics.com/viewtopic.p ... ______Date: Thu, 10 Oct 2013 15:24:44 -0500Subject: Re: Pietenpol-List: Re: webinar