Original Posted By: GREA738(at)aol.com
>I asked this one before but didnt get any answers>yet. After I made my rudder bar out of steel rube, I>noticed that It said to use chrome molley tube. does>anybody know the reason for that? If it is because of>the wear factor from your feet. could I just use some>type of high wear sleeve. or is it a weight or>strength issue.>>________________________________________________________________________________
Pietenpol-List: GN-1's?
Pietenpol-List: GN-1's?
Original Posted By: leonstefanhutks(at)webtv.net (Leon Stefan)
Anyone building a GN please contact me.Steve________________________________________________________________________________
Anyone building a GN please contact me.Steve________________________________________________________________________________
Pietenpol-List: Re: GN-1's?
Original Posted By: Howard Wilkinson
>Anyone building a GN please contact me.>>SteveRibs done, center section done, most welding done, fusdone, 75% done 99%to goNear AtlantaBarry Davisbed(at)mindspring.com>________________________________________________________________________________
>Anyone building a GN please contact me.>>SteveRibs done, center section done, most welding done, fusdone, 75% done 99%to goNear AtlantaBarry Davisbed(at)mindspring.com>________________________________________________________________________________
Pietenpol-List: Re:
Original Posted By: del magsam
Del: The Pietenpol rudder bar as simple as it is could be built fromanything of adequate strength. Chrome Moly is stronger than mildsteel, but more important than that is that 4130 may be had invirtually any dimension and thickness.... Mild steel is not availablein very many thicknesses suitable for our purposes. My opinion is that 6061 T6 aluminum could easily be substituted byusing a slightly larger diameter and thickness. In general aluminumis said to be about 1/2 the strength of steel, but only 1/3 theweight. This means that if you size the part to have a bit in excessof 60% of the weight of the steel part you should be in pretty goodshape. I personally would put a nylon insert where the center boltgoes through it, and probably at either end where the cables attach ifI were doing this... but then I'm a bit of a fanatic about bushingsand plugs. I show it as being 3/4" .035 which weighs .2673 lbs per foot {.479lbs for the part}. Looking at Aircraft Spruce catalog, I see that7/8" .058 wall 2024 (stronger than 6061) weighs in at .1777 lbs perfoot {.318 lbs for the part}, and the next size .065 weighs .1979 lbsper foot {.3545 lbs for the part}. I would think that either of thesewould probably be adequate....... This would yield a savings of 2 ozor 2.5 oz roughly for the part.**** Just my opinion **** I assume most folks use some sort of wrapping or dip on this partrather than bare metal ???? The 2.5 oz savings could allow for anice non slip coating
How about a nice polished laminated wood piece there whereeverybody can admire it If you are going all out for the Oshkosh grandchampion homebuilt award little details like that make all thedifference ;-)P.S. Ounces add up into pounds add up into TONS..... However careshould be exercised in material substitution as the strength andfatigue properties of materials are different.-----Original Message-----
Del: The Pietenpol rudder bar as simple as it is could be built fromanything of adequate strength. Chrome Moly is stronger than mildsteel, but more important than that is that 4130 may be had invirtually any dimension and thickness.... Mild steel is not availablein very many thicknesses suitable for our purposes. My opinion is that 6061 T6 aluminum could easily be substituted byusing a slightly larger diameter and thickness. In general aluminumis said to be about 1/2 the strength of steel, but only 1/3 theweight. This means that if you size the part to have a bit in excessof 60% of the weight of the steel part you should be in pretty goodshape. I personally would put a nylon insert where the center boltgoes through it, and probably at either end where the cables attach ifI were doing this... but then I'm a bit of a fanatic about bushingsand plugs. I show it as being 3/4" .035 which weighs .2673 lbs per foot {.479lbs for the part}. Looking at Aircraft Spruce catalog, I see that7/8" .058 wall 2024 (stronger than 6061) weighs in at .1777 lbs perfoot {.318 lbs for the part}, and the next size .065 weighs .1979 lbsper foot {.3545 lbs for the part}. I would think that either of thesewould probably be adequate....... This would yield a savings of 2 ozor 2.5 oz roughly for the part.**** Just my opinion **** I assume most folks use some sort of wrapping or dip on this partrather than bare metal ???? The 2.5 oz savings could allow for anice non slip coating
How about a nice polished laminated wood piece there whereeverybody can admire it If you are going all out for the Oshkosh grandchampion homebuilt award little details like that make all thedifference ;-)P.S. Ounces add up into pounds add up into TONS..... However careshould be exercised in material substitution as the strength andfatigue properties of materials are different.-----Original Message-----