ASK21 --- OR --

OR take delivery now of --- PW-6U, sn 78.04.06 registered as N17YC. It is
operating from Ridge Soaring in Julian, Pa. Well equipped and with AVIONIC
trailer. Dual oxygen system and GPS/Nav also available.

New in October, this ship can be yours for US 75,000 (euro 59,000)

Charles Yeates

tel/fax 902.443.0094 Web site
http://www3.ns.sympatico.ca/yeatesc/world.html

--

--
Charles Yeates

CMYeates & Associates
105 Dunbrack St, Apt 110
Halifax, NS, Canada, B3M 3G7
tel/fax 902.443.0094

Web site http://www3.ns.sympatico.ca/yeatesc/world.html

On Nov 7, 10:32*am, "Charles Yeates" wrote:
OR take delivery now of --- PW-6U, *sn 78.04.06 *registered *as
N17YC ... for US 75,000 (euro 59,000)

How much for just the fuselage minus fin and the canopy
transparencies?

Thanks, Bob K.

On Nov 7, 1:32*pm, "Charles Yeates" wrote:
OR take delivery now of --- PW-6U, *sn 78.04.06 *registered *as N17YC. It is
operating from Ridge Soaring in Julian, Pa. Well equipped and with AVIONIC
trailer. Dual oxygen system and GPS/Nav also available.

New in October, this ship can be yours for US 75,000 (euro 59,000)

Charles Yeates

tel/fax * 902.443.0094 *Web sitehttp://www3.ns.sympatico.ca/yeatesc/world.html

--

--
Charles Yeates

CMYeates & Associates
105 Dunbrack St, Apt 110
Halifax, NS, Canada, *B3M 3G7
tel/fax * 902.443.0094

Web site *http://www3.ns.sympatico.ca/yeatesc/world.html

- Or Perkoz, with the 20 meter wing extensions it becomes 1/40 cross
country trainer.
http://www.szd.com.pl/pdf/szd-54_perkoz_doku_en.pdf

On Nov 7, 11:05*am, GK wrote:

*- Or Perkoz, with the 20 meter wing extensions it becomes
1/40 cross country trainer.
http://www.szd.com.pl/pdf/szd-54_perkoz_doku_en.pdf

A 40:1 best L/D with that big clunky fixed gear hanging down? That
calls for a larger grain of salt than I have handy.

I don't think 40/1 is remotely unreasonable for the Perkoz, even with
that "big clunky fixed gear hanging down." It has 20m in wing span and
a decent aspect ratio. Compared to the Duo Discus and the DG500/1000
series, it's about 4-5 pts less in best L/D or about a 10% hit in
performance. Seems very reasonable to this professional aerodynamicist.

On Nov 7, 1:53*pm, Bob Kuykendall wrote:
On Nov 7, 10:32*am, "Charles Yeates" wrote:

OR take delivery now of --- PW-6U, *sn 78.04.06 *registered *as
N17YC ... for US 75,000 (euro 59,000)

How much for just the fuselage minus fin and the canopy
transparencies?

Thanks, Bob K.

Probably about $80K :-)

On Nov 7, 5:10*pm, KevinFinke wrote:
I don't think 40/1 is remotely unreasonable for the Perkoz...

Ten bucks says that if the Idafliegs do a polar it tops out at or
below 39.

Thanks, Bob K.

On Nov 7, 7:51*pm, Bob Kuykendall wrote:
On Nov 7, 5:10*pm, KevinFinke wrote:

I don't think 40/1 is remotely unreasonable for the Perkoz...

Ten bucks says that if the Idafliegs do a polar it tops out at or
below 39.

Thanks, Bob K.

I'd be curious about the result. Our club Janus C has a 20 meter wing
and 'clunky fixed gear'. The manual claims 43:1. I know from
experience it's better than my Speed Astir.

On Nov 7, 8:10*pm, Uncle Fuzzy wrote:

I'd be curious about the result. *Our club Janus C has a 20 meter wing
and 'clunky fixed gear'. *The manual claims 43:1. *I know from
experience it's better than my Speed Astir.

I'm pretty curious as well. I don't hold Dr. Finke's qualifications,
but the calibration I get from comparing manufacturers' claims with
Idaflieg and Johnson results leads me to generally approach the
manufacturers claims with something between "probably not" and "no
nfbsk'n way." That skepticism has stood me in good stead so far.

The things I see in the photos and three-view of the SZD that make it
questionable in my mind are that the undercarriage does appear to hang
down quite a bit from the fairing, and is not the cleanly-faired and
mostly enclosed wheel of the Janus and ASK and even of the G103. Also,
the degree of taper of the wing leads me to suspect that there will be
a non-trivial amount of washout, which could tend to make the wingtip
extensions less effective than you might otherwise expect. I seem to
recall that the Slingsby 15/17m Dart is an example of such. To the
Perkoz's credit, it looks to be a nice clean and well-proportioned
machine, so I woudn't be too surprised to lose ten bucks on the wager.

Johnson's tests on the 18.2m Janus rang up an impressive 40.9:1, so it
seems within reason that the 20m variety could do 43:1. I had thought
that Johnson had done the G104, but it's not on the SSA Web Site. It
might well be in the hardcopy Johnson compendium, I'll try to remember
to check that at work next week.

Thanks, Bob K.
www.hpaircraft.com/hp-24

Couldn't the wing use multiple airfoils or varying thicknesses to get
around the need for (as much) washout, despite the moderate taper
ratio? Those wouldn't be immediately obvious from the visuals or 3-
views... *shrug*

--Noel