Original Posted By: Isablcorky(at)aol.com
Hello Pieters.Here in Sweden it is both difficult and expensive to obtain American spruce. On the other hand we have plenty of cheap, first class, Swedish fir. We are just three Air Camper builders in this country and as far as I know in the whole of Scandinavia. My buddy and me are both going for a laminated spar and it is all right with the Swedish EAA branch. My friend Per has already finished his wing with the spar and it looks great. I am going to start working on the spar in a couple of months.It consists of five pieces of first class fir 1 x 1 x 14 laminated together to form a solid piece of 5 x 1 x 14. It is then milled down to 4 x x 132 for the three-piece wing. Next step is to build up the I-beam shape by laminating four pieces x x 14 to each spar, two at the top and two at the bottom. Last step is to laminate in fillers made of ply where the spar has a solid cross section. I hope you can follow this description.Per has glued his spar as well as his whole aeroplane with recorsinol glue. I on the other hand am using epoxy. Of course this is going to end up a little heavier then a spruce-spar but on the other hand it will be many times stronger.Congratulations Corky! You have built a very nice looking aeroplane. I use a picture of you in front of your machine as a background on my computer. It is a great inspiration to me and helps me to explain to other people what I am doing.For what it is worth.Jannica WungeMSN Motor: Kp & slj din bil hr http://carview.msn.se/bilsok/__________ ... __________
Pietenpol-List: Laminated spar.
Re: Pietenpol-List: Laminated spar.
Original Posted By: "Michael Conkling"
Subject: Re: Pietenpol-List: Laminated spar.Jannica,Thank you for the compliment. I need all I can get. I wonder if your fir is of the quality so as to use a solid spar. If so, I would sure experiment at least before going through the efforts building up one. I used a solid 3/4 fir spur with a little routing per plans but I would never route again as the savings were not worth the work of routing. I also cut an angle atop each spar with alignment to the rib to avoid those tacky little wedges, That is also an unnecessay operation, in my opinion. As far as strength is concerned, that wing as designed will hold up anything you can load in the plane. Hope you end up with a plane you are proud Corky,La, USA________________________________________________________________________________
Subject: Re: Pietenpol-List: Laminated spar.Jannica,Thank you for the compliment. I need all I can get. I wonder if your fir is of the quality so as to use a solid spar. If so, I would sure experiment at least before going through the efforts building up one. I used a solid 3/4 fir spur with a little routing per plans but I would never route again as the savings were not worth the work of routing. I also cut an angle atop each spar with alignment to the rib to avoid those tacky little wedges, That is also an unnecessay operation, in my opinion. As far as strength is concerned, that wing as designed will hold up anything you can load in the plane. Hope you end up with a plane you are proud Corky,La, USA________________________________________________________________________________