crossfire2 glide-ratio

[ger00039 0]

Hi, I'm a Crossfire2(149sqrft)-user and I'd like to learn more about the glide-ratio / glide angle of my canopy. Any hints?

[phoenixlpr 0]

You may find some data on trackingderby.com.

Anyway a skydiving canopy has a glide ratio between 1:2-1:3.

[JohanW 0]

Going from memory here .. we did a cross-country a couple of years back from 6 miles out, exit altitude 12000'. The Triathlons did not make it back, most of the 9-cells barely made the dropzone, the Crossfire made the DZ at about 4000'. There will have been wind, but not howling, it was not that kind of XC. Best you can say from that, of course, is that the Crossfire is trimmed flatter than most other canopies.

Size or wingload is not really important; you can "upsize" by riding in brakes without affecting your glide ratio. That is a fact, Brian Germain has the supporting data. (This is about brakes affecting glide ratio. It's not about suicidal downsizing "but that's OK, I'll fly it in brakes." Have to be careful here ..)

Johan.
I am. I think.

[shropshire 0]

Borrow a GPS with a barometric altimeter and then do some maths.

(.)Y(.)
Chivalry is not dead; it only sleeps for want of work to do. - Jerome K Jerome

[hackish 8]

Quote

Borrow a GPS with a barometric altimeter and then do some maths.

You can do it with an altitrack and a runway of known length. I calculated it for my Sabre2 on our 6000' runway and it agreed with published results.

-Michael

[shropshire 0]

That would work too.

(.)Y(.)
Chivalry is not dead; it only sleeps for want of work to do. - Jerome K Jerome

[ger00039 0]

Maybe I'll try sth like that but I thought there are some "published results" available by now.

[ger00039 0]

thank you, interesting source...

[phoenixlpr 0]

If you plan a cross country jump, that is different.

[ger00039 0]

Not my plan. I'm comfortable with my canopy. Just want to learn more about its special technology.

[DJL 232]

Quote

Borrow a GPS with a barometric altimeter and then do some maths.

That won't be accurate because you're still trying to measure according to ground-speed, which will vary. The only way is to use an accurate altimeter to measure your descent and a hand-held anemometer for your speed and calculate it with the time to descend a couple thousand feet (for better accuracy) traveling in a straight line.

"I encourage all awesome dangerous behavior." - Jeffro Fincher

[erdnarob 1]

And the result is ? You really got a no wind condition ? And was it with toggles up for the whole ride ?

Learn from others mistakes, you will never live long enough to make them all.