---------------------------------------------------------- TeamGrumman-List Digest Archive --- Total Messages Posted Thu 01/12/12: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 10:30 AM - Re: Grumman airfoil (Bob Steward) 2. 12:38 PM - Re: Grumman airfoil (Deems Herring) 3. 08:22 PM - Re: Re: Grumman airfoil (Gary Vogt) 4. 08:22 PM - Re: Grumman airfoil (Gary Vogt) ________________________________ Message 1 _____________________________________ Time: 10:30:01 AM PST US From: Bob Steward Subject: TeamGrumman-List: Re: Grumman airfoil >The Socata Trinidad airfoil is an RA 1643 or RA 16.3c3 > >The Avions Transport Regional ATR-72 uses an RA 1843 airfoil. This >is a NACA 43018 Mod. > >It's my guess that the RA 16.3c3 is the Grumman airfoil. Now all we >need are lift/drag curves. Based on your transposition of the digits in the ATR-72 airfoil (which has been shown to have a dangerous proclivity to build ice that destroys the lift...), one would surmise that the "RA1643" airfoil is a "43016" (mod?) airfoil. I haven't seen this overlayed on the Grumman bastardization of the NACA laminar flow airfoil used on the Yankee, but would say that if it is a close match, then the L/D curves would at least point us in the right direction of understanding the Grumman modded airfoil. Are you basing your suggestion of identicallity on actual plots overlaid, or on the relative appearance of 2 smaller samples compared side by side? Damn little info found through Google on either the RA 1643 or the RA 16.3c3, other than some listings of which planes they have been used on. --Bob Steward ________________________________ Message 2 _____________________________________ Time: 12:38:48 PM PST US From: Deems Herring Subject: RE: TeamGrumman-List: Grumman airfoil If someone can provide a .dat coordinate file I can provide the lift/drag c urves. Deems From: teamgrumman@yahoo.com Subject: TeamGrumman-List: Grumman airfoil The Socata Trinidad airfoil is an RA 1643 or RA 16.3c3 The Avions Transport Regional ATR-72 uses an RA 1843 airfoil. This is a NA CA 43018 Mod. It's my guess that the RA 16.3c3 is the Grumman airfoil. Now all we need a re lift/drag curves. ________________________________ Message 3 _____________________________________ Time: 08:22:02 PM PST US From: Gary Vogt Subject: Re: TeamGrumman-List: Re: Grumman airfoil I cannot find any L/D curves for any RA airfoils.=0A=0AThe RA 1843 is an ol der NACA airfoil. -It wasn't that good then. -We need to find a compara ble '6' series airfoil.=0A=0A=0A________________________________=0A From: B ob Steward =0ATo: teamgrumman-list@matronics.com =0ASent: Thursday, January 12, 2012 10:25 AM=0ASubject: TeamGrumman-List: R d =0A=0A=0A> The Socata Trinidad airfoil is an RA 1 643 or RA 16.3c3=0A> =0A> The Avions Transport Regional ATR-72 uses an RA 1 843 airfoil.- This is a NACA 43018 Mod.=0A> =0A> It's my guess that the R A 16.3c3 is the Grumman airfoil.- Now all we need are lift/drag curves. =0A=0ABased on your transposition of the digits in the ATR-72 airfoil (whic h has been shown to have a dangerous proclivity to build ice that destroys the lift...), one would surmise that the "RA1643" airfoil is a "43016" (mod ?) airfoil.=0A=0AI haven't seen this overlayed on the Grumman bastardizatio n of the NACA laminar flow airfoil used on the Yankee, but would say that i f it is a close match, then the L/D curves would at least point us in the r ight direction of understanding the Grumman modded airfoil.=0A=0AAre you ba sing your suggestion of identicallity on actual plots overlaid, or on the r elative appearance of 2 smaller samples compared side by side?=0A=0ADamn li ttle info found through Google on either the RA 1643 or the RA 16.3c3, othe r than some listings of which planes they have been used on.=0A=0A--Bob Ste ==================== ________________________________ Message 4 _____________________________________ Time: 08:22:11 PM PST US From: Gary Vogt Subject: Re: TeamGrumman-List: Grumman airfoil Sadly, I can't find that either.=0A=0A=0A________________________________ =0A From: Deems Herring =0ATo: teamgrumman-list@matr onics.com =0ASent: Thursday, January 12, 2012 12:35 PM=0ASubject: RE: TeamG rumman-List: Grumman airfoil=0A =0A=0A =0AIf someone can provide a .dat coo rdinate file I can provide the lift/drag curves.=0A=0ADeems=0A=0A=0A=0A=0A_ _______________________________=0ADate: Wed, 11 Jan 2012 20:08:10 -0800=0AF rom: teamgrumman@yahoo.com=0ASubject: TeamGrumman-List: Grumman airfoil=0AT o: teamgrumman-list@matronics.com=0A=0A=0AThe Socata Trinidad airfoil is an RA 1643 or RA 16.3c3=0A=0AThe-Avions Transport Regional ATR-72 uses an R A 1843 airfoil. -This is a NACA 43018 Mod.=0A=0AIt's my guess that the RA 16.3c3 is the Grumman airfoil. -Now all we need are lift/drag curves.=0A List" target="_blank">http://www.matronics.com/Navigator?TeamGrumman-List =0Ahttp://forums.matronics.com=0A="_blank">http://www.matronics.com/contr ===================== ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message teamgrumman-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/TeamGrumman-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/teamgrumman-list Browse Digests http://www.matronics.com/digest/teamgrumman-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.