On Apr 13, 2:56*pm, Mike the Strike wrote:
On Apr 13, 9:58*am, ContestID67 wrote:

Great document. *Thanks.

Concerning "Spratt guidelines of 2500’ AGL to launch, 3300’ AGL to
start, should be followed unless there is a good reason."

This is ambiguous as to what is being referenced for the AGL height.
Cloudbase? *Critical updraft height? *BL height? *Sniffer max height?
Beer fumes from the bacchanalia the night before? *;-)

Thanks.

I'm pretty sure this is top of the lift actually achieved by gliders
in the air. 3300 ft AGL is probably workable for many eastern sites
and possibly Hobbs but I would hesitate to start a task in Arizona
this low. *Contestants are likely to be soon on the ground at local
strips or eating cactus! *I personally would recommend a minimum of
5,000 ft AGL here.

Mike

Spratt 2500 to launch is derived from a "standard" 2000 ft AGL tow
and, of course, we don't fly closer than 500 vertically from clouds.
3300 AGL is min recommended to open task. That does not say CD and
advisors must open at that. Local situations may dictate higher.
Example in the East- at new Castle 3300 above airport is only 800 or
so above some important local terrain. as result, the "go" there is
set higher.
I hope this clarifies a bit.
UH