---------------------------------------------------------- Pietenpol-List Digest Archive --- Total Messages Posted Wed 03/02/16: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:56 AM - Re: Re: Pilot seat back angle (Clif Dawson) 2. 11:49 AM - Marine plywood (Pocono John) 3. 02:17 PM - Laminating plywood. (john francis) 4. 03:33 PM - welding 4130 hinges (danoliver) 5. 06:46 PM - Re: welding 4130 hinges (CatDesigns) 6. 06:54 PM - Re: Laminating plywood. (CatDesigns) ________________________________ Message 1 _____________________________________ Time: 12:56:29 AM PST US From: "Clif Dawson" Subject: Re: Pietenpol-List: Re: Pilot seat back angle Probably right, Oscar, but what's assumed is MSL, pressure and temp. When was the last time you saw any of those things? :-) Also that Kelly guy running all those dyno tests stated that he never got 40 hp out of a stock A, only 36. Clif Did you know that no man, or woman for that matter, has ever gone into a hardware store wanting a drill bit. What they really wanted was a hole. Okay, but going down the page to acceptable rate of climb, 1180 ft in 3 minutes (about 400 FPM) may be ambitious for a 40HP Air Camper at max gross. > > -------- > Oscar Zuniga > Medford, OR > Air Camper NX41CC "Scout" > A75 power ________________________________ Message 2 _____________________________________ Time: 11:49:34 AM PST US Subject: Pietenpol-List: Marine plywood From: "Pocono John" I searched the forums and did find some info, but I just wanted to share this. I found a place 1:45 away that sells marine and aircraft plywood. Unfortunately, they're almost out of aircraft wood and do not plan to re-stock as demand is low and their west coast supplier went belly up. As far as the marine plywood, they have plenty. I'm told it's BS1088 starting at 3mm (3/32", so bit too thick for 1/16" parts)up to 25mm (1"). This page shows their selection: http://www.condonlumber.net/plywood/marineaircraft.html To date, I've used only wood from wicks and AS&S. Ribs are done and I have wood for fuselage gussets (not the big side pieces or belly). I think I have enough for tail section gussets. Any suggestions as to where I could use the marine plywoodor where to avoid its' use? For anyone in the Pocono,PA region, I could pick-up sheets for you. Finally, any suggestions on what I should buy while I'm there? Would it be OK to use 3/32" where 1/16" is indicated (going bigger)? Thank you. John -------- John Read this topic online here: http://forums.matronics.com/viewtopic.php?p=453364#453364 ________________________________ Message 3 _____________________________________ Time: 02:17:03 PM PST US Subject: Pietenpol-List: Laminating plywood. From: "john francis" I have some good 1/16 aircraft plywood. I am in need of 1/8. Is it okay to epoxy two 1/16 sheets together to make 1/8? -------- John Francis Read this topic online here: http://forums.matronics.com/viewtopic.php?p=453367#453367 ________________________________ Message 4 _____________________________________ Time: 03:33:22 PM PST US Subject: Pietenpol-List: welding 4130 hinges From: "danoliver" Has anyone had any trouble with brittle welds? I am new to all of this so don't rule out rookie error. I have spent the last couple weeks trying to fab the empennage hinges to no avail. I am using .090 4130 steel from AS&S and an oxy/acetylene welder. My welds are easily broken and when you look at the breaks they look crystalline. As an experiment I decided to try several methods of simply welding two flat pieces of steel together including; preheating, postheating, reheating, over penetration, under penetration, filler rod, and no filler rod. All with the same result, I can bend them to about 30 degrees and then they snap. The worst part is that I can grab any piece of scrap steel laying around my garage, cut it in half, and weld it back together with ease. Is there some special procedure needed to weld 4130? Do I even need to use 4130? Bernard doesn't call for it in the plans. Please help. -------- Dan O Read this topic online here: http://forums.matronics.com/viewtopic.php?p=453369#453369 ________________________________ Message 5 _____________________________________ Time: 06:46:03 PM PST US From: "CatDesigns" Subject: RE: Pietenpol-List: welding 4130 hinges Dan I'm not an expert but I have done all the welding on my Pietenpol using Oxy fuel. Typically 4130 welds easily. The only time I have gotten brittle welds is when I over heat the weld. Questions I can think of. Are you sure you have a soft neutral flame? Are you using too small of a tip so it takes a lot of heat to start the weld puddle thus over heating the metal or too big of a tip so it heats really fast and over heats the metal? What welding rod are you using? Chris Sacramento, CA WestcoastPiet.com -----Original Message----- From: owner-pietenpol-list-server@matronics.com [mailto:owner-pietenpol-list-server@matronics.com] On Behalf Of danoliver Sent: Wednesday, March 2, 2016 3:33 PM Subject: Pietenpol-List: welding 4130 hinges --> Has anyone had any trouble with brittle welds? I am new to all of this so don't rule out rookie error. I have spent the last couple weeks trying to fab the empennage hinges to no avail. I am using .090 4130 steel from AS&S and an oxy/acetylene welder. My welds are easily broken and when you look at the breaks they look crystalline. As an experiment I decided to try several methods of simply welding two flat pieces of steel together including; preheating, postheating, reheating, over penetration, under penetration, filler rod, and no filler rod. All with the same result, I can bend them to about 30 degrees and then they snap. The worst part is that I can grab any piece of scrap steel laying around my garage, cut it in half, and weld it back together with ease. Is there some special procedure needed to weld 4130? Do I even need to use 4130? Bernard doesn't call for it in the plans. Please help. -------- Dan O Read this topic online here: http://forums.matronics.com/viewtopic.php?p=453369#453369 ________________________________ Message 6 _____________________________________ Time: 06:54:26 PM PST US From: "CatDesigns" Subject: RE: Pietenpol-List: Laminating plywood. Depends on what it is used for. If it is for a spar web I might not but I would not have any problems using elsewhere on a Pietenpol. Just make sure you have good glue coverage between the two. Chris Sacramento, CA WestcoastPiet.com -----Original Message----- From: owner-pietenpol-list-server@matronics.com [mailto:owner-pietenpol-list-server@matronics.com] On Behalf Of john francis Sent: Wednesday, March 2, 2016 2:17 PM Subject: Pietenpol-List: Laminating plywood. --> I have some good 1/16 aircraft plywood. I am in need of 1/8. Is it okay to epoxy two 1/16 sheets together to make 1/8? -------- John Francis Read this topic online here: http://forums.matronics.com/viewtopic.php?p=453367#453367 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message pietenpol-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Pietenpol-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/pietenpol-list Browse Digests http://www.matronics.com/digest/pietenpol-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.