Brodhead Pietenpol Association

Original Posted By: "gcardinal"
Hi Guys,This may be a dumb question but which way does the C of G move if you movethe wing BACK! Does it follow the wing movement, i.e. move the wing back CGmoves aft, move the wing forward CG moves forward?CheersPeterWonthaggi, Australiahttp://www.cpc-world.com-- 10:36 PM________________________________________________________________________________

Original Posted By: "Peter W Johnson"
The reason for moving the wing is to change the location of the airfoil's center of lift in relation to the aircraft's center of gravity.To answer your question, the aircraft cg will move aft when you move the wing aft but the airfoil center of lift will move aft much more than the cg.Greg C.----- Original Message -----

Original Posted By:

Original Posted By: owner-pietenpol-list-server(at)matronics.com
Walt,Thats what I am hoping. I would appreciate a copy of your spreadsheet. Ihave made one myself but would be good to see how you have done it.ThanksPeter.-----Original Message-----

Original Posted By: "walt evans"

Original Posted By: owner-pietenpol-list-server(at)matronics.com
Walt,Thanks very much, I'll give them a try.CheersPeter.-----Original Message-----

Original Posted By: Rcaprd(at)aol.com
Subject: Re: Pietenpol-List: Weight & BalancePeter, Before all this fancy computer stuff (but still using a calculator), I did the weight & balance like I show on this web page:http://nx770cg.com/OperationsManual.htmlScroll down to the bottom of the page, and see all possible loading configurations. I use the firewall as the datum (per plans), so there will besome negative numbers when doing the calculations. The reason, by today's standards,they put the datum ahead of the prop, is that there will be no negative numbers. Walt always has the good explanation of what happens when you move the wing: You're not actually moving the wing aft...what you are really doing is moving the fuselage forward.Chuck G.NX770CG________________________________________________________________________________

Original Posted By: "Peter W Johnson"
Subject: Re: Pietenpol-List: Weight & BalanceIn a message dated 11/22/2006 5:43:26 PM Central Standard Time, waltdak(at)verizon.net writes:Chuck, If I didn't tell you before, let me tell you now,,,that your video was great. Lots of great stuff on building, and a must for the new builders.Those TP drops were a blast.Thanks, Walt. I'm still working on a trailer for 'Flying NX770CG' to put up on YouTube or Google video, to try to drum up some sales...which dropped off to almost nothing. I guess just about everyone on the list has it, so now it's time to branchout to the general population, and show them the thrills of flying a Pietenpol - Low & Slow !!Chuck G.NX770CG________________________________________________________________________________

Original Posted By: owner-pietenpol-list-server(at)matronics.com
Walt/Greg,I moved the wing back about three inches today. It made a difference(forward) of about five inches. I can now make up my front cabane struts andbe happy. I'll do another complete W&B after the struts are fitted.Many thanksPeter.-----Original Message-----

Original Posted By: "Rick Holland"

Original Posted By: "Lagowski Morrow"
I weighed NX221PT the other day to get 602 lbs, 50 of it on the tail wheel. This is a Piet with a 65 hp Continental, gas tank behind the firewall, no electrical system/battery and cabanes tilted back~2 1/2" from vertical to help compensate for the lighter than Model A engine. Included is a painted metal prop, seat cushions and carpeting. Control tubing in the cockpit and all control horns are painted aluminum. My CG is ~19 to 20" back from the leading edge (60" chord) depending on # of passengers and gas amount. The 800x 6 wheels and brakes are just ahead of the leading edge of the wing. I used 170lb passengers.(me and my grandson)The question is, what is the experience with similar planes and what gross weight are you using for planning purposes??First time engine noise this week!!----Jim Lagowski________________________________________________________________________________