What Polar

[Dan[_13_]]

I own a Open Cirrus and was wondering what polar I should be using in
SeeYou mobile?
SeeYou has two polars, Cirrus 18m, with a L/D of 39:1 and Cir.L265,
with a L/D of 44:1
The 44:1 matches the Cirrus’s L/D, but I’ve never seen it called Cir.
L265 ?, and when you google
Cir.L265 it shows pics of a Open Cirrus.
Thanks

[Hagbard Celine]

Paul Bickle's "Polars Of Eight" test got these results from a Cirrus:

best L/D 37:1

6.5 lb/square ft. loading at 878lb.
knots - fpm.
40 -138
50 -136
60 -173
70 -230
80 -319
90 -430
100 -577
110 -766

8.06 lb/square ft. loading at 1093lb.
knots - fpm.
40 -N/A
50 -141
60 -168
70 -213
80 -278
90 -362
100 -472
110 -624

[aerodyne]

I have flight test data for my aircraft s/n80, I would use the Bikle
data as a start. certainly NOT 44:1

Contact me, I will put you on the Open Cirrus message board, can get
you the data you need.

Aerodyne

aerodyne<AT>socal<DOT>rr<DOT>com

[Erik Braun]

Since the German Aerospace Center (DLR) owned an Open Cirrus once for
comparison in Idaflieg polar measurements, the Cirrus polar should be
very well known.

See: http://users.ox.ac.uk/~gliding/docs/Polar%20Comparison%20Chart.xls

Erik.


Am 18.04.2012 03:52, schrieb Dan:
> I own a Open Cirrus and was wondering what polar I should be using in
> SeeYou mobile?
> SeeYou has two polars, Cirrus 18m, with a L/D of 39:1 and Cir.L265,
> with a L/D of 44:1
> The 44:1 matches the Cirrus’s L/D, but I’ve never seen it called Cir.
> L265 ?, and when you google
> Cir.L265 it shows pics of a Open Cirrus.
> Thanks

[Dan[_13_]]

On Apr 18, 1:22*pm, Erik Braun > wrote:
> Since the German Aerospace Center (DLR) owned an Open Cirrus once for
> comparison in Idaflieg polar measurements, the Cirrus polar should be
> very well known.
>
> See:http://users.ox.ac.uk/~gliding/docs/Polar%20Comparison%20Chart.xls
>
> Erik.
>
> Am 18.04.2012 03:52, schrieb Dan:
>
>
>
> > * I own a Open Cirrus and was wondering what polar I should be using in
> > SeeYou mobile?
> > SeeYou has two polars, Cirrus 18m, with a L/D of 39:1 and Cir.L265,
> > with a L/D of 44:1
> > The 44:1 matches the Cirrus’s L/D, but I’ve never seen it called Cir.

[Mike the Strike]

I believe the Cirrus L265 is the factory designation of the original 17.7 meter configuration.

Try Googling it!

Mike

On Wednesday, April 18, 2012 7:10:29 PM UTC-7, Dan wrote:
> On Apr 18, 1:22*pm, Erik Braun > wrote:
> > Since the German Aerospace Center (DLR) owned an Open Cirrus once for
> > comparison in Idaflieg polar measurements, the Cirrus polar should be
> > very well known.
> >
> > See:http://users.ox.ac.uk/~gliding/docs/Polar%20Comparison%20Chart.xls
> >
> > Erik.
> >
> > Am 18.04.2012 03:52, schrieb Dan:
> >
> >
> >
> > > * I own a Open Cirrus and was wondering what polar I should be using in
> > > SeeYou mobile?
> > > SeeYou has two polars, Cirrus 18m, with a L/D of 39:1 and Cir.L265,
> > > with a L/D of 44:1
> > > The 44:1 matches the Cirrus’s L/D, but I’ve never seen it called Cir.
> > > L265 ?, and when you google
> > > Cir.L265 it shows pics of a Open Cirrus.
> > > Thanks- Hide quoted text -
> >
> > - Show quoted text -
>
> Thanks for the information,
> I'm still curious about the Cir.L265 in Seeyou mobile,
> maybe it's an extended span Cirrus like Moffat modified in the sunship
> games?
> Dan