Oh lord, I'll spoon feed it to ya, so open wide cuz here comes the airplane
Lets use some mock jump numbers for XYZ turbine DZ.
Jumps are 13 or 17.9k (5,000fpm decent to a base/final, kinda like the video but a little easier).
12 loads
Lets say half are 17.9, other half 13k, thus average altitude is 15.5
Normal "RESPONSIBLE" weekend warrior rate of decent is 1000-1500fpm, so 1250fpm average.
Time to do a normal pattern .1 (downwind, base, final, etc)
SO,
15500' / 1250fpm = 12.4 min plus the .1 (6min) for the standard issue pattern
18.4min
15500' / 5000fpm = 3.1 min to wheels down plus, 1 minute for decel turn to final / flaps, thats
4.1 min
So you want to burn up 14.3 minutes (or .23hrs) per load.
On the average day of 12 loads thats 171.6 minutes extra (2.8hrs)
Now if the fog doesn't clear until 12 (common on the coast) and it gets dark at 8, we have 8hours to get say, 70 people wavered, paid, harnessed and out the plane.
Now with your sissy ass decent we NOW have 5.2 hours!!
Now lets figure the cost to operate a turbine aircraft unnecessarily for another 2.8hrs each day
You just cut our time to get everyone in the air by 35% and ADDED 2.8 hours on our engine, prop and airframe PER DAY!
Hell, just doing a full pattern at .1 extra per load.
That 1.2hrs extra a day, figure the overhaul on that turbine is 250,000, hot sections, cycles, fuel, aircraft cost and interest on load, insurance, etc, NOW calculate the hourly cost, heck just playing the "full pattern game" it'll cost around $1100 per day with 12 loads!!
I'll say it one more time, that type of increase in costs on a turbine 1m+ dollar plane, plus the loss of revenue for wasting daylight, that's the difference between a successful DZ that puts food on peoples tables and another failed aviation business.