Original Posted By: steve(at)byu.edu
Stevee,I saw a comment( in R Decosta's archive) you had made about makingyour three piece wings with shorter length spars. i am very interestedin this as i have suitable spar stock in 12 ft that I was planning oncutting into smaller pieces for longerons etc. All of my wood iscoming out of 8/4X4X12...I was looking at the plans for the threepiece wings and trying to decide if the center section could be made alittle wider and the spars scarfed towards the end...it sounds likeyou may have done some thing similar..I'd love to know thedetails...And of course advice from anyone is appreciated!paris________________________________________________________________________________
Pietenpol-List: 3-piece wing
Pietenpol-List: RE: 3-piece wing
Original Posted By: "McNarry, John"
I did do this very thing. I have a center section that is 48" wide. Usedthe one piece wing fittings for the attachment to the cabanes and the threepiece wing strap attachments to the wing panels. My spars also came from12' stock and everything works just fine. I have about 38 hours without aproblem. There are no joints in my spars. The Center section is notrouted, but the outboard spars are routed as per plans. Loads at the jointforce it closed just as in the short center section version, and It makesfor a much easier (roomier) place to work when attaching/detaching thewings. One thing I would change however, is extending the flop across thefull width of the center section, or just making a cut out.SteveeStevee,I saw a comment( in R Decosta's archive) you had made about makingyour three piece wings with shorter length spars. i am very interestedin this as i have suitable spar stock in 12 ft that I was planning oncutting into smaller pieces for longerons etc. All of my wood iscoming out of 8/4X4X12...I was looking at the plans for the threepiece wings and trying to decide if the center section could be made alittle wider and the spars scarfed towards the end...it sounds likeyou may have done some thing similar..I'd love to know thedetails...And of course advice from anyone is appreciated!paris________________________________________________________________________________
I did do this very thing. I have a center section that is 48" wide. Usedthe one piece wing fittings for the attachment to the cabanes and the threepiece wing strap attachments to the wing panels. My spars also came from12' stock and everything works just fine. I have about 38 hours without aproblem. There are no joints in my spars. The Center section is notrouted, but the outboard spars are routed as per plans. Loads at the jointforce it closed just as in the short center section version, and It makesfor a much easier (roomier) place to work when attaching/detaching thewings. One thing I would change however, is extending the flop across thefull width of the center section, or just making a cut out.SteveeStevee,I saw a comment( in R Decosta's archive) you had made about makingyour three piece wings with shorter length spars. i am very interestedin this as i have suitable spar stock in 12 ft that I was planning oncutting into smaller pieces for longerons etc. All of my wood iscoming out of 8/4X4X12...I was looking at the plans for the threepiece wings and trying to decide if the center section could be made alittle wider and the spars scarfed towards the end...it sounds likeyou may have done some thing similar..I'd love to know thedetails...And of course advice from anyone is appreciated!paris________________________________________________________________________________
Pietenpol-List: RE: 3-piece wing
Original Posted By: Ian Holland
Stevee:Did you make any changes to the fuel tank at the same time? I have been thinking about tank size and fuel burn. There is not much point in carrying morefuel than my derry-air can endure but a bit more wouldn't hurt. I don'thave an assembled weight on my Cirrus engine yet, but I imagine that unlike the Continental engines I have to move the wing forward. Does there seem to be any downwash from the trailing edge? If the wing is moved forward to get theC of G right, then does the gear move too? I imagine having the gear forward would help with prop clearance. Jump in guys any advice considered!Thanks John Mc________________________________________________________________________________
Stevee:Did you make any changes to the fuel tank at the same time? I have been thinking about tank size and fuel burn. There is not much point in carrying morefuel than my derry-air can endure but a bit more wouldn't hurt. I don'thave an assembled weight on my Cirrus engine yet, but I imagine that unlike the Continental engines I have to move the wing forward. Does there seem to be any downwash from the trailing edge? If the wing is moved forward to get theC of G right, then does the gear move too? I imagine having the gear forward would help with prop clearance. Jump in guys any advice considered!Thanks John Mc________________________________________________________________________________
Pietenpol-List: RE: 3-piece wing
Original Posted By: Paris Wilcox
Yep I increased the tank size from 10 to 14+ gallons. Adding an inch toit's width while keeping the profile the same adds about a gallon. My tankis just over 4 inches wider than normal.Stevee-----Original Message-----McNarry, JohnSent: Monday, June 08, 1998 12:08 PMSubject: Pietenpol-List: RE: 3-piece wingStevee:Did you make any changes to the fuel tank at the same time? I have beenthinking about tank size and fuel burn. There is not much point in carryingmorefuel than my derry-air can endure but a bit more wouldn't hurt. I don'thave an assembled weight on my Cirrus engine yet, but I imagine that unlikethe Continental engines I have to move the wing forward. Does there seem tobe any downwash from the trailing edge? If the wing is moved forward to gettheC of G right, then does the gear move too? I imagine having the gear forwardwould help with prop clearance. Jump in guys any advice considered!Thanks John Mc________________________________________________________________________________
Yep I increased the tank size from 10 to 14+ gallons. Adding an inch toit's width while keeping the profile the same adds about a gallon. My tankis just over 4 inches wider than normal.Stevee-----Original Message-----McNarry, JohnSent: Monday, June 08, 1998 12:08 PMSubject: Pietenpol-List: RE: 3-piece wingStevee:Did you make any changes to the fuel tank at the same time? I have beenthinking about tank size and fuel burn. There is not much point in carryingmorefuel than my derry-air can endure but a bit more wouldn't hurt. I don'thave an assembled weight on my Cirrus engine yet, but I imagine that unlikethe Continental engines I have to move the wing forward. Does there seem tobe any downwash from the trailing edge? If the wing is moved forward to gettheC of G right, then does the gear move too? I imagine having the gear forwardwould help with prop clearance. Jump in guys any advice considered!Thanks John Mc________________________________________________________________________________
Pietenpol-List:
Original Posted By: steve(at)byu.edu
I know this sounds like a bad idea, but has anyone ever scarfedlongerons together- my next big problem is getting the length stock Ineed to make my longerons with-all my material is in th 10-12 ft range.Paris________________________________________________________________________________
I know this sounds like a bad idea, but has anyone ever scarfedlongerons together- my next big problem is getting the length stock Ineed to make my longerons with-all my material is in th 10-12 ft range.Paris________________________________________________________________________________
Original Posted By: Ken Beanlands
Paris,Don't know why this would be a bad idea... I did it with all four longeronson my ship. I did choose to locate the joints behind the plywood up frontand near a cross brace. Worked just fine. In fact I'm rather proud ofthose joints because although they are in plain site you can't tell yourlooking at them unless it is pointed out.Steveesounds like you had the same source of wood I did. 12' lengths.-----Original Message-----Paris WilcoxSent: Monday, June 08, 1998 2:35 PMSubject:I know this sounds like a bad idea, but has anyone ever scarfedlongerons together- my next big problem is getting the length stock Ineed to make my longerons with-all my material is in th 10-12 ft range.Paris________________________________________________________________________________
Paris,Don't know why this would be a bad idea... I did it with all four longeronson my ship. I did choose to locate the joints behind the plywood up frontand near a cross brace. Worked just fine. In fact I'm rather proud ofthose joints because although they are in plain site you can't tell yourlooking at them unless it is pointed out.Steveesounds like you had the same source of wood I did. 12' lengths.-----Original Message-----Paris WilcoxSent: Monday, June 08, 1998 2:35 PMSubject:I know this sounds like a bad idea, but has anyone ever scarfedlongerons together- my next big problem is getting the length stock Ineed to make my longerons with-all my material is in th 10-12 ft range.Paris________________________________________________________________________________