1997-06-18

Discussions de vol libre au Québec

1 juin 1997 au 20 août 2000

Archivées par le Front de Libération aérienne du Québec


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Date: 18 juin 1997

De: Louis Bastarache (234)

Sujet: Outils météo (2)

J'aimerais savoir s'il existe un autre outil de ce type (
http://csrp.tamu.edu/soar/for.html), mais qui couvre mieux nos sites de vol...


Date: 18 juin 1997

De: Louis Bastarache (234)

Sujet: Jetstream riding paraglider

-----Original Message-----

From: BARCLAY Ian

Sent: Wednesday, June 18, 1997 11:40 AM

To: hang-gliding@lists.utah.edu

Subject: Jetstream Riding Paraglider

> I've been working on this to try to figure what kind of mountain I'd

> need for a PG 100-miler. In theory, a 78 thousand-footer would do, but

> the fall-off in glide performance at altitude means it would take more

> like a 129 thousand foot launch. This means that Everest is only 100 k

> short. I'm still working on this problem....

> Penguin

> The Day that a Paraglider Pilot

> can Claim a distance Record over 300 Miles is the day that I quit Hang

> Gliding.

> David Vincent

The admirable attempts by Penguin to do a PG 100 miler are to be

encouraged but I am afraid 78000ft hills and 2100mph tailwinds are

somewhat rare. The way to do not only 100 miles, not only 300 miles, not

only smash the existing paragliding record but also the hang gliding,

sailplane and possibly even Voyagers circumnavigation record is to build

a Jetstream Riding paraglider (JRPG). This would harness the power of

the atmospheric jetstreams to soar thousands of miles across the oceans

and continents. So what would this wing look like and how would it work?

The wing would be a vast 6000ft2 (560m2) canopy of 250ft (76m) span. The

suspension lines would be 5000ft (1500m) long. The pilot would sit

within a pressurised pod (with sealed openings to allow him to stick his

legs out for that all important foot launching and landing capability).

Attached to the pilot pod would be a round drag parachute of about

1000ft2.

LE TE

___________________

\_________________| Canopy

\ / /|\

\ / |

\ / |

\ / Suspension |

\ / Lines 5000 ft

\ / |

\ / |

\_/ |

Drag Chute (-----------|_| Pilot Pod \|/

----- Direction of Travel ----->

And how would it work? The canopy could perhaps be foot launched from

the summit of Everest or more practically from an aerotow to 35000ft

(say behind a small turboprop) or from a balloon launch. After release

the pilot would descend through the 120mph winds of the jetstream that

exist between 25000ft and 45000ft. He would then level out with the

canopy facing directly into the fastest moving airstream. The pilot

would then deploy the round drag chute. With the canopy flying at an

airspeed of say 25 mph with a headwind of about 120mph the JRPG would be

blown backwards at 95 mph groundspeed. The pod however, being 3000ft

lower down and outside the jetstream itself, would be travelling in wind

speeds of maybe only 70 mph. With the groundspeed of 95mph backwards it

would see an airspeed of 25mph in the opposite direction to that seen by

the canopy. The drag chute would be sized such that its drag matched

that of the canopy but would be in the opposite direction. The JPRG

would therefore have a total drag of zero and would then cruise along

with an infinite glide angle.

Before you dismiss this as a load of complete bollocks think it through

carefully and check the greatly simplified maths (+ is taken in the

direction of travel of the JRPG over the ground) :

Altitude Wind Speed Airspeed Groundspeed Drag

Canopy 33000ft +120mph +25mph +95mph +250lbf

Pod + 28000ft +70mph -25mph +95mph -250lbf

Drag chute

-------------

Total Drag = 0 lbf

This is no magic, no perpetual motion machine. It is all good physics (I

think). It simply harnesses the power of nature by spanning a wind

gradient.

Practical problems are numerous : launching, landing, dynamic behaviour

of canopy/pod/canopy system, turbulence in jetstream, canopy control,

pod systems, etc and these are just back of the envelope numbers.

However much of the technology and many of the problems are the same as

those for balloon circumnavigation which is not too far away from being

achieved. Crazy? Sure it is crazy? Any takers?

p.s. theoretically it would also work in the much weaker wind gradient

caused by the ground. Which paraglider pilot is going to try that with

their regular canopy and reserve chute? Come on Penguin; 100 miles,

backwards, at an altitude of 3ft; that would be something!

Ian Barclay

Toulouse, France


Date: 18 juin 1997

De: Fred T. L. Wilson" (12)

Sujet: Bchpa's canadian hang gliding and paragliding site guide

The BCHPA's Canadian Hang Gliding and Paragliding Site Guide is out of the

printers and on the street.

To place orders by (cheque or money order in CDN$ _______) please contact the:

B.C.H.P.A. Pres. Rick Hunt Email: bchpa@silk.net

RR. 1 S. 4 Comp. 46

Peachland, B.C. Canada V0H 1X0

Ph / Fax 1-250-767-6717

*****

The BCHPA's Site Guide pushes 272 pages and includes sites from the East

Coast: our Maritimes Region with 4 sites to date; One Hundred and Four...

in BC (Major Sites only); Twelve in Alberta; and even Eleven in Alaska

(USA). There is information on Contacts and flying sites in Saskatchewan

(thirteen); and Manitoba (six); but as a significant portion of the

Qu'Appelle Valley is being returned to the First Nations Peoples, we are

unsure as to the future status of many sites. Therefore much of the

detailed information has been reserved for the time being. (Contact the

MHPA for up-to-date info.) We hope to include an additional package on

Sites in Ontario and Quebec at a later date: Basic Contact data is provided

for these two provinces only... other than Teviodale in Ontario, which is

gung ho on towing, aerotowing and all things nice.

The cost for the Site Guide is

CDN$27.00 for the full version with binder and

CDN$17.00 for the insert package for those who already own the original

guide book.

...Which is outstanding value for your money.

The Site Guide is produced as a fund raiser for the BCHPA, our the Clubs

and the dealer networks which support our sports. Therefore any clubs and

dealers who pre-pay for Bulk Orders (3 or more) will receive a kick back of

$5.00 per copy (full Guide with Binder; and the Insert Package itself.)

We wish to make it very clear that this is a fund raising service. It is

NOT provided so that clubs can give their members cut rate Guide Books. The

money raised is to be used to support our clubs and associations and in

particular to generate funds through which to improve existing sites and to

develop new ones.

For our dealers, we hope this offer will offset the cash outlay they have

to put out. Please note that this offer is not restricted to British

Columbia. (We may not restrict it to Canada for that matter! Mailing Costs

will be the determining factor on this one!)

As each section of the Site Guide was completed, local clubs and pilots

have taken over effective control the accuracy of the information and are

posing the Site Guide on the Internet. This ensures rapid dissemination of

critical, up to date, information. Links to each Provincial and Regional

Site will be posted on the HPAC Home Page at:

http://www.cadvision.com/Home_Pages/accounts/midtoad/hpac.htm

Thank You

Site Guide Editor

HPAC Accident Review & Safety Committee Chairman

Fred T L Wilson Email: fwilson@IslandNet.com

102 - 1236 Pandora Victoria B.C. Canada V8R 3R4

Ph: 1-250-360-0696 Work: 250-386-6773 Fax: 250-386-3941


Date: 18 juin 1997

De: Marco Levasseur (143)

Sujet: Renseignement sur le mont washington (2)

Salut à tous,

Pour tous ceux qui auraient envis de voler au Mont Washington, voici quelques

renseignements intéressants:

Le décollage est orienté sud-est

Les décollages doivent être entre 10:00 am et 5:00 pm.

Les décollages s'effectuent près des réservoirs d'eau

Niveau 4

Nous devons payer les frais de remontée pour la route

La météo peut changer très rapidement

L'atterrissage se trouve au sud du batiment de péage.

Le site est volable environ 10 fois par année (Les hautes pressions sont favorables)

Bonne chance à ceux qui veulent s'attaquer au plus haut sommet à l'est de l'amérique

du nord.

MecFly


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