Brodhead Pietenpol Association

Original Posted By: "Gene Rambo"
What is the recommended AOI for a Piet airfoil?According to my calculations, my AOI is .56 degrees.When taking my measurements, I assumed the chord line to be at the center ofthe radius of the L.E. to the center of the T.E. I then referenced thisangle to the top longeron.Seems to me that the AOI should be around 1 or 1.5 degreesDJ VeghN74DVMesa, AZwww.imagedv.com/aircamperThis email has been scanned for known viruses and made safe for viewing by Half Price Hosting, a leading email and web hosting provider. For more information on an anti-virus email solution, visit .________________________________________________________________________________

Original Posted By: "Bill Church"
Jerry,I think I've used most of them too. The masterful pilot in that picture is AndrewKing. Nigel Hitchman was the photographer.Bill, very interesting about the angle of incidence versus the location of thebottom of the spars. I had not thought about that being thrown into the equation.Don EmchNX899DERead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Angle of Incidence

Original Posted By: Michael Perez

Original Posted By: "K5YAC"
Attached are a couple of scale drawings that illustrate the actual angle of incidenceformed between the fuselage and the chord line of the airfoil for the AirCamper, when outfitted with the standard FC-10 Pietenpol airfoil, and alsothe Riblett GA30UA612 airfoil.In both cases, the geometry used is based on the bottom surface of the spars makingcontact with the top surface of the bottom capstrip of the rib. Spar spacingis as per the Pietenpol plans, as is the location of the spars, relative tothe leading edge. Cabane mounting brackets are assumed to be mounted tight tothe underside of the spars. Cabane strut lengths are as per plans. With thefront cabanes 1 inch longer than the rear cabanes, an incidence angle of 2 degreesis formed between the fuselage and the underside of the spars (for BOTH cases).The difference lies in the angle formed between the bottom of the sparsand the chord line of the specific airfoil. For the FC-10, that angle is approximately1.5 degrees. For the Riblett 612, the angle is about 2.1 degrees. Thisdifference is a characteristic of the bottom profile of the airfoil relativeto the chord line.Therefore, by comparing these two drawings, we can see that if the Riblett airfoilis mounted on the plans-built Pietenpol cabane struts, the result will bean aircraft with approximately 0.6 degrees greater angle of incidence than thestandard plans-built Pietenpol with the FC-10 airfoil. No doubt, this would affectthe flight characteristics of the plane. In order to keep the angle of incidencethe same as the original design, while using the Riblett airfoil, thefront cabanes should only be about 11/16" longer than the rear, rather than the1" shown in the plans.Bill C.Read this topic online here:http://forums.matronics.com/viewtopic.p ... ttachments: http://forums.matronics.com//files/ribl ... ___Subject: Pietenpol-List: Re: Angle of Incidence

Original Posted By: Charles Waldo
Subject: Re: Pietenpol-List: Angle of Incidence

Original Posted By: "Pieti Lowell"
erkki67 wrote:> Hello Douwe> > Thank you very much for your input.> > I wasn't aware about those builders in Florida, and for sure I would like toknow more about their fuselages.> > I've found a aircraft which have my demanded riveted fuselage, but it's a biplane(german Kiebitz ) as well, but I would prefer to have a parasol like thePietenpol. > > As the weight is an issue, at least here at France, and I would like to registerit here in our 2 seater ultralight class MTOW 1041.6lbs incl parachute andPAX.> > This is the reason why I would prefer to have a Piet or look a like that's aslight as possible.> > And to get there, I belive that the riveted Aluminium tube system is the wayto go.> > And by the way, to rivet the airframe together is within reach of almost everybuilder.> > I've been following the Airdrome Aeroplanes for some while and even wrote toMr. Baslee, but the price he asked for a Parasol was out of my reach, for thatprice I could buy a LSA, but as I'm not Bill Gates, I'll have to find an homebuildingsolution.> > Bst rgds> > ErkkiA properly optimized riveted aluminum tube fuselage is not going to be significantlylighter than a properly optimized welded steel fuselage. I'm not sayingdon't do it, I'm saying you don't gain anything but some ease of construction...at the same time, the attachment "hard points" take a little more effortfor things like landing gear, cabanes, lift struts, etc.If you want to design your own aircraft, have at it! Otherwise you can't go wrongif you build from the plans.I believe there is someone on here who designed steel tube tail surfaces for usewith the steel fuselage... as noted, the steel fuselage will save you some weight-and torch welding steel isn't rocket science, just practice a little onsome scrap tubing.Using a lighter engine will also save some weight.A big thing that people overlook is paint. Paint is HEAVY! If you want a glossy,showplane finish, it will weigh more than the minimum needed. Finish it through"silvercoat" (the UV coat) and add a few minimal stripes of color- you'llsave a lot of weight.And remember, the gross weight of your aircraft is what you say it is.--------Brad "DOMIT" SmithFirst rule of ground school: This is the ground... don't hit it going fast.Read this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: Angle of Incidence

Original Posted By: Oscar Zuniga
Bill,I have been trying to say what you have explained, because of forward stick pressurerequired to go faster than 60 MPH, I am experimenting with a variable rearCabane height to see where the best position will be and keep in mind my 612wing is shorter and it may require a different angle than a full length wing.Pieti LowellRead this topic online here:http://forums.matronics.com/viewtopic.p ... __________

Original Posted By: "Bill Church"
Thanks Ken, I'm thinking the same way you are. My spars are 3/4". I will getsome more strips sheared this morning as I have the grain running the wrong wayon the top pieces....dang!--------JohnRead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: Angle of Incidence

Original Posted By: Charles Waldo
All are simple 90 degree bends. Thanks guys, i just got back from the weld shopwith my new strips sheared to size. That should give me enough work to do thisweekend.--------JohnRead this topic online here:http://forums.matronics.com/viewtopic.p ... ______Date: Fri, 15 Apr 2011 13:00:12 -0400Subject: Re: Pietenpol-List: Re: Angle of Incidence