I done a shade under 70 MPH in inspire 1 in a good wind..

Thats really cool! but i wouldnt try that very much. You can crash it since they have max speed recomendations! {:2_40:}

I reached 73.1.  ATTI, tailwind, slightly descending.

72 MPH with slight wind.

GeneralToner Posted at 2015-5-7 06:12
72 MPH with slight wind.

glad not the only one having some fun.. I didn't even do a straight shot with the wind but made same sound in the wind when went by.. cool..

Who can top 72MPH? Post a vid or it didn't happen

I expect one could reach almost any speed in ATTI with enough tailwind! If you wish to risk destroying your $3000 machine, please do it in an uninhabited location and below 400 feet. I don't want to read about  a property damage or personal injury incident with one of these crafts, engendering new, restrictive legislation against all the rest of us.....

Think point of thread was talk about fun things you do with i1..

there certain about of risk in just getting the i1 just in the air..
And out all the activities I do w/i1 this is one less risky.

Rbimd Posted at 2015-5-12 17:58
I expect one could reach almost any speed in ATTI with enough tailwind! If you wish to risk destroyi ...

You have to understand the distinction between air speed & ground speed. The I1 is measuring ground speed with GPS, so it's airspeed is added to the wind speed to read an increased ground speed. Flying upwind, measured ground speed is reduced by the headwind speed.

BUT, in both cases, the I1's air speed is the same. If it will fly 50 mph in still air, flying downwind in a 50 mph wind, ground speed will read 100 mph, but the craft's air speed is still the same 50 mph. Flying upwind in the same theoretical 50 mph wind, ground speed would be 0. In both cases, the I1 would be feeling exactly the same apparent wind, forces would be the same, etc. Your craft is not seeing increased stress from higher ground speed flying downwind.

This comes from 15 years of holding an advanced paragliding rating. The difference between airspeed and ground speed confuses a lot of people.

I hold an advanced degree in science, I get the distinction, and it has nothing whatever to do with my post.  If his airspeed is 50 MPH and flying downwind in a 70 MPH gale during a storm front, he can crash into someone's house with enough force (from his 120 MPH groundspeed) to cause great damage. The press will pick up the story and run with it, shedding yet more negative publicity upon our hobby.

Never mind, didn't realize you were just lecturing