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Airush Ultra: one strut kite that meets expectations of a ram air lover

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pikovsg
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Re: Airush Ultra: one strut kite that meets expectations of a foilkite fan

Postby pikovsg » Tue Jul 04, 2017 12:51 pm

It was an 8-11 knot day.

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Re: Airush Ultra: one strut kite that meets expectations of a foilkite fan

Postby Peter_Frank » Tue Jul 04, 2017 3:50 pm

pikovsg wrote:
Tue Jul 04, 2017 12:51 pm
It was an 8-11 knot day.
:thumb: :thumb: :thumb:

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Re: Airush Ultra: one strut kite that meets expectations of a foilkite fan

Postby Peter_Frank » Tue Jul 04, 2017 4:23 pm

iriejohn wrote:
Tue Jul 04, 2017 9:12 am
Peter_Frank wrote:
Tue Jul 04, 2017 7:20 am
But when saying a 7-10 mile day it is really confusing, as it could be seamiles per hour (or nautical miles per hour same thing) which is knots, and it could be miles per hour which is less than 87 % of knots.

8) Peter
[pedant]

A mile is 1,760 yards
A nautical mile is 2,000 yards

Thus one mile per hour is 1760/2000 = 0.88 nautical miles per hour (knots)

[/pedant]

Not so...

A mile is 1760 yards indeed.
A yard is 3 feet or 0.9144 meters exactly.
A nautical mile is exactly 1852 meters = 1852/0.9144 yards = 2025.3718 yards and not 2000 yards !

Thus the conversion one mph = 1760/2025.3718 knots = 0.869 knots and not 0.88.

8) Peter

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Re: Airush Ultra: one strut kite that meets expectations of a foilkite fan

Postby pikovsg » Tue Jul 04, 2017 4:40 pm

Can we stick to the Ultra kite please?

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Re: Airush Ultra: one strut kite that meets expectations of a foilkite fan

Postby Rakky » Tue Jul 04, 2017 7:07 pm

pikovsg: You were going to review the Ultra 15m. Any updates

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Re: Airush Ultra: one strut kite that meets expectations of a foilkite fan

Postby iriejohn » Tue Jul 04, 2017 7:51 pm

Peter_Frank wrote:
Tue Jul 04, 2017 4:23 pm
iriejohn wrote:
Tue Jul 04, 2017 9:12 am
Peter_Frank wrote:
Tue Jul 04, 2017 7:20 am
But when saying a 7-10 mile day it is really confusing, as it could be seamiles per hour (or nautical miles per hour same thing) which is knots, and it could be miles per hour which is less than 87 % of knots.

8) Peter
[pedant]

A mile is 1,760 yards
A nautical mile is 2,000 yards

Thus one mile per hour is 1760/2000 = 0.88 nautical miles per hour (knots)

[/pedant]

Not so...

A mile is 1760 yards indeed.
A yard is 3 feet or 0.9144 meters exactly.
A nautical mile is exactly 1852 meters = 1852/0.9144 yards = 2025.3718 yards and not 2000 yards !

Thus the conversion one mph = 1760/2025.3718 knots = 0.869 knots and not 0.88.

8) Peter
You are right. I have always used the nautical mile for navigation (2,000 yards).
The Imperial nautical mile, often called an Admiralty mile, or more correctly, an Admiralty measured mile, was defined by its relation to the Admiralty knot, 6,080 imperial feet per hour, so 1 imperial nautical mile is about 1,853.181 meters.[13] It was abandoned in 1970 and, legally, references to the obsolete unit are now converted to 1,853 meters.
Last edited by iriejohn on Tue Jul 04, 2017 8:06 pm, edited 4 times in total.

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pikovsg
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Re: Airush Ultra: one strut kite that meets expectations of a foilkite fan

Postby pikovsg » Tue Jul 04, 2017 7:54 pm

Haven't yet tested the Ultra with foil, hasn't been that low wind-wise to to test it. Lowest it's been was 9 knots, and that works for my 10.4 Cloud D. Based on flying the Ultra 15m once on the beach, I suspect it's low end may be the same or a knot lower than 13.4 Cloud D (6-7 knots). At wind speeds that low, 1 knot less is A LOT.

If that's the case, I suspect the 13.4 Cloud would still see more use because it's way smaller and more agile. At that point, the two advantages of the Ultra would be higher boosting and easier relaunching in low wind. But, so far that's all speculation.
Last edited by pikovsg on Tue Jul 04, 2017 8:52 pm, edited 8 times in total.

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Re: Airush Ultra: one strut kite that meets expectations of a foilkite fan

Postby Brian H » Tue Jul 04, 2017 7:58 pm

The topic is about a kite not how to measure wind . :argue:

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Re: Airush Ultra: one strut kite that meets expectations of a foilkite fan

Postby abel » Tue Jul 04, 2017 8:53 pm

Brian H wrote:
Tue Jul 04, 2017 7:58 pm
The topic is about a kite not how to measure wind . :argue:
Yeah,..right... we want to know if the Ultra 15 keeps hanging in 4 miles and you can fly in 6... errrr... knots :oops:
Seems like no Joe had the chance to thoroughly test/compare it to a foil, as probably is not delivered yet (besides a few beta units); am I right? :roll: :wink:

Piko, thi'suppose to flatter as its excluding you from the average Joe category :P

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Re: Airush Ultra: one strut kite that meets expectations of a foilkite fan

Postby slowboat » Tue Jul 04, 2017 9:16 pm

pikovsg, your wind speeds for the Clouds....what length lines are you using?


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