Original Posted By: Copinfo
Del:Chrome-molly steel is about four times the tensile strength of SAE 1025steel. It's properties are toughness and wear resistance. Ref. A&P Techgen textbook. I would not use standard steel on any flight controlsystem.Del: Chrome-molly steel is about fourtimes thetensile strength of SAE 1025 steel. It's properties are toughness andwearresistance. Ref. AP Tech gen textbook. I would not use standardsteel onany flight control system.________________________________________________________________________________
Pietenpol-List: chrome-moly steel
Pietenpol-List: Re:
Original Posted By: Copinfo
Del, use the go with the 4130 tubing. Believe it or not, the rudder barwill bend when you push on it hard enough.Copinfo(at)ix.Netcom.ComTim CunninghamDes Moines, Iowa (515) 237-1510>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.>>________________________________________________________________________________
Del, use the go with the 4130 tubing. Believe it or not, the rudder barwill bend when you push on it hard enough.Copinfo(at)ix.Netcom.ComTim CunninghamDes Moines, Iowa (515) 237-1510>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: Re: chrome-moly steel
Original Posted By: "Jack Phillips (EUS)"
Gary: Your statement:>Chrome-molly steel is about four times the tensile strength of SAE1025 >steel. It's properties are toughness and wear resistance. Ref.A&P Tech >gen textbook. I would not use standard steel on any flightcontrol system. Is very misleading. Standard tensile strength of 4130 chrome molysteel is 90,000 PSI. Mild steel is normally about 60,000 PSI. Mymath says that the difference is 50%, not 400%. However 4130 steelmay be tempered to somewhere in the neighborhood of 200,000 psi. Itis not available generally at such a temper. In most aircraftstructures which are welded the chrome moly steel is normalized andoffers very little additional strength over mild steel. It has beendebated for years weather it was worthwhile to use 4130 when theclusters were soft and only the steel beyond the reach of the heatretained it's factory strength. The primary advantage is that it maybe had in many sizes and thicknesses in seamless tubing......Ichallenge anybody to find material to build an aircraft from mildsteel tubing in the same dimensions of seamless tubing...... It can'tbe done!!H.W.________________________________________________________________________________
Gary: Your statement:>Chrome-molly steel is about four times the tensile strength of SAE1025 >steel. It's properties are toughness and wear resistance. Ref.A&P Tech >gen textbook. I would not use standard steel on any flightcontrol system. Is very misleading. Standard tensile strength of 4130 chrome molysteel is 90,000 PSI. Mild steel is normally about 60,000 PSI. Mymath says that the difference is 50%, not 400%. However 4130 steelmay be tempered to somewhere in the neighborhood of 200,000 psi. Itis not available generally at such a temper. In most aircraftstructures which are welded the chrome moly steel is normalized andoffers very little additional strength over mild steel. It has beendebated for years weather it was worthwhile to use 4130 when theclusters were soft and only the steel beyond the reach of the heatretained it's factory strength. The primary advantage is that it maybe had in many sizes and thicknesses in seamless tubing......Ichallenge anybody to find material to build an aircraft from mildsteel tubing in the same dimensions of seamless tubing...... It can'tbe done!!H.W.________________________________________________________________________________
Pietenpol-List: Re: chrome-moly steel
Original Posted By: RBush96589(at)aol.com
>Del: >Chrome-molly steel is about four times the tensile strength of SAE 1025steel. It's properties are toughness and wear resistance. Ref. A&P Tech gentextbook. I would not use standard steel on any flight control system.The 1025 is at the middle of Chromoly and 6061-T6.... If aluminum is OK,then why not 1025?1025 is stong (not like the mild 1018 used for conduit tubes)SaludosGary Gower________________________________________________________________________________
>Del: >Chrome-molly steel is about four times the tensile strength of SAE 1025steel. It's properties are toughness and wear resistance. Ref. A&P Tech gentextbook. I would not use standard steel on any flight control system.The 1025 is at the middle of Chromoly and 6061-T6.... If aluminum is OK,then why not 1025?1025 is stong (not like the mild 1018 used for conduit tubes)SaludosGary Gower________________________________________________________________________________
Pietenpol-List: Re: chrome-moly steel
Original Posted By: Gary Gower
>Gary:> Your statement:>>>Chrome-molly steel is about four times the tensile strength of SAE>1025 >steel. It's properties are toughness and wear resistance. Ref.>A&P Tech >gen textbook. I would not use standard steel on any flight>control system.>>> Is very misleading. Standard tensile strength of 4130 chrome moly>steel is 90,000 PSI. Mild steel is normally about 60,000 PSI. My>math says that the difference is 50%, not 400%. I am another Gary but:1025 is not the same as mild steel mild steel is 1018.I am not sure of this but is something that has to do with the amount ofcarbon and strenth...SaludosGary Gower________________________________________________________________________________
>Gary:> Your statement:>>>Chrome-molly steel is about four times the tensile strength of SAE>1025 >steel. It's properties are toughness and wear resistance. Ref.>A&P Tech >gen textbook. I would not use standard steel on any flight>control system.>>> Is very misleading. Standard tensile strength of 4130 chrome moly>steel is 90,000 PSI. Mild steel is normally about 60,000 PSI. My>math says that the difference is 50%, not 400%. I am another Gary but:1025 is not the same as mild steel mild steel is 1018.I am not sure of this but is something that has to do with the amount ofcarbon and strenth...SaludosGary Gower________________________________________________________________________________
Pietenpol-List: Re: chrome-moly steel
Original Posted By: Earl Myers
4130 and 1025 are both classified as mild steels which is a term thatseperates it from more exotic steels, some of which aren't so exoticanymore, like stainless steel. 4130 can be easily welded to 1025 and youcan't really tell the difference between the two while welding . The last two digits refer to the carbon content and are an indicationof strength. When I went to A&P school 31 years ago, we were told thatthe minumum that could be used in aircraft was 1025, but I have sincelearned that some non-structural support members in a J-3 are made of1010 steel. Although 4130 is substantially stronger than 1025, its main reason forbeing used is because of its corrosion resistant characteristics. Thisdoesn't mean it can't rust; it certainly will if it's not properly caredfor. Mooney Aircraft introduced the 252 in 1986 and there arose a problemwith the windows leaking, allowing water to soak the insulation. Becausethere was no air movement or ventilation behind the upholstery, andbecause the old style insulation can hold an unbelieveable amount ofwater, one of the original 252's which has a 4130 steel cage in thecockpit area had severe corrosion of these tubes only six months afterdelivery. The plane had to be demated and the sides removed to replacethe corroded tubes. Mooney, of course, was sued over this and has sinceissued a service bulletin calling for the replacement of the insulationand regular inspections of the window seals, the tubular frame, and thewing centersection lower splice plates. It is seldom to find a latemodel Mooney that doesn't need some window resealing done during annualinspections. John Langston writes:>>Gary:>> Your statement:>>>>>Chrome-molly steel is about four times the tensile strength of SAE>>1025 >steel. It's properties are toughness and wear resistance. Ref.>>A&P Tech >gen textbook. I would not use standard steel on any flight>>control system.>>>>>> Is very misleading. Standard tensile strength of 4130 chrome >moly>>steel is 90,000 PSI. Mild steel is normally about 60,000 PSI. My>>math says that the difference is 50%, not 400%. >>I am another Gary but:>>>1025 is not the same as mild steel >>mild steel is 1018.>>I am not sure of this but is something that has to do with the amount >of>carbon and strenth...>>Saludos>>Gary Gower>>__________________________________________________________________________________________
4130 and 1025 are both classified as mild steels which is a term thatseperates it from more exotic steels, some of which aren't so exoticanymore, like stainless steel. 4130 can be easily welded to 1025 and youcan't really tell the difference between the two while welding . The last two digits refer to the carbon content and are an indicationof strength. When I went to A&P school 31 years ago, we were told thatthe minumum that could be used in aircraft was 1025, but I have sincelearned that some non-structural support members in a J-3 are made of1010 steel. Although 4130 is substantially stronger than 1025, its main reason forbeing used is because of its corrosion resistant characteristics. Thisdoesn't mean it can't rust; it certainly will if it's not properly caredfor. Mooney Aircraft introduced the 252 in 1986 and there arose a problemwith the windows leaking, allowing water to soak the insulation. Becausethere was no air movement or ventilation behind the upholstery, andbecause the old style insulation can hold an unbelieveable amount ofwater, one of the original 252's which has a 4130 steel cage in thecockpit area had severe corrosion of these tubes only six months afterdelivery. The plane had to be demated and the sides removed to replacethe corroded tubes. Mooney, of course, was sued over this and has sinceissued a service bulletin calling for the replacement of the insulationand regular inspections of the window seals, the tubular frame, and thewing centersection lower splice plates. It is seldom to find a latemodel Mooney that doesn't need some window resealing done during annualinspections. John Langston writes:>>Gary:>> Your statement:>>>>>Chrome-molly steel is about four times the tensile strength of SAE>>1025 >steel. It's properties are toughness and wear resistance. Ref.>>A&P Tech >gen textbook. I would not use standard steel on any flight>>control system.>>>>>> Is very misleading. Standard tensile strength of 4130 chrome >moly>>steel is 90,000 PSI. Mild steel is normally about 60,000 PSI. My>>math says that the difference is 50%, not 400%. >>I am another Gary but:>>>1025 is not the same as mild steel >>mild steel is 1018.>>I am not sure of this but is something that has to do with the amount >of>carbon and strenth...>>Saludos>>Gary Gower>>__________________________________________________________________________________________