Looking at the article, which is presented in German in OSTIV volume XIII Waikerie 1974 as Anthony suggested, the Std Cirrus polar diagram is given for 15 metre and 16 metre spans. There is only a faint difference at the slow speed end up to 50 kts where a slightly lower minimum sinking speed is shown due to the lower wing loading at what I take as equivalent pilot weight. Otherwise beyond 50 kts only one line is shown. Someone else may have shown a difference in other testing of the 15 m and 16 m versions, but this article shows only a faint difference at slow speed which is not worth bothering with in terms of speed to fly constructions such as speed rings around variometers. If someone wants a copy then send me a direct email (ie don't bother everyone on aus-soaring) with a real world address. I will photocopy article but expect a delay as I will be away gliding just for a change. Roger Druce [EMAIL PROTECTED]
_____ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Nick Gilbert Sent: Monday, 22 January 2007 3:40 PM To: [EMAIL PROTECTED]; Discussion of issues relating to Soaring in Australia. Subject: Re: [Aus-soaring] FW: Polar Roger Druce would be your best bet I reckon... He has helped me out with something similar before. Nick. On 1/22/07, Anthony Smith <[EMAIL PROTECTED]> wrote: It is actually a technical paper from OSTIV XIII (presented at Waikerie in '74?). If anyone has a copy, I would appreciate a copy as well. Anthony > Can anyone help Andrew? > > There seems to be the needed info in the book: > "Flugmessungen an 35 Segelflugzeugen und Motorseglern by > H. Laurson and H. Zacker, DFVLR Institute, Germany, > (1976)" > > Any other info anyone? > > The info in Polar10.xls comes from this book but the polar > for the Cirrus [D-3261] with the 16m tips is probably only > shown without the tips installed. > > Regards > SWK > > > > > -----Original Message----- > > From: ANDREW WRIGHT > > Sent: Monday, 22 January 2007 1:58 PM > > To: Kittel, Stephen W (ETSA) > > Subject: Polar > > > > Hello Stephen > > > > Could you help me please. Could you please post a > > request on aus-soaring for someone to tell me where I > > can get a polar curve for a Standard Cirrus 75 B 16 > > meter version. I can not post onto aus- soaring! > > > > Regards > > AW > > > > ANDREW WRIGHT > > > > ********************************************************** > ************ This email and any file attachments are > confidential and intended solely for the use of the > individual or entity to whom they are addressed. > If you have received this email in error please tell us > immediately by return email and delete the document. > The information in this email expresses the opinion of the > author and does not necessarily represent the views of > ETSA Utilities. > ********************************************************** > ************ > > _______________________________________________ > Aus-soaring mailing list > [email protected] > To check or change subscription details, visit: > http://lists.internode.on.net/mailman/listinfo/aus-soaring <http://lists.internode.on.net/mailman/listinfo/aus-soaring> _______________________________________________ Aus-soaring mailing list [email protected] To check or change subscription details, visit: http://lists.internode.on.net/mailman/listinfo/aus-soaring
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