formula for crosswind correction in hold
- Thread starter Mavmb
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Bandit_Driver
Gold Member
just take SWAG and adjust from there. O wait I'm in an advanced aircraft now....The box will figure it out and fly a perfect pattern...
MidlifeFlyer
Well-Known Member
That's pretty much it. For jollies, I pulled up my copy of the old Java applet, Tom's Navigation simulator and set up the scenario I mentioned earlier:
Hold southwest of the VOR on the 220° radial. You are heading to the VOR
on a course of 340° Winds are from the east at 30 KTS. IAS is 110
No GPS. No DME. No HSI. Just a VOR and a DG.
on a course of 340° Winds are from the east at 30 KTS. IAS is 110
No GPS. No DME. No HSI. Just a VOR and a DG.
My SWAG went like this: "Gee, that's just about a direct crosswind. How about it I crank in 10° for each 10 KTS and see what happens." So, crossing the VOR, I turned right to a heading of 190°.
It wasn't perfect, but it was pretty darn close. And if it wasn't a direct crosswind and I overestimated the correction? Big deal. The protected airspace is designed for 200 KTS and imperfection.
The Fez
Analog Millennial
Whatever happened to "The first lap is free"? Some people need to channel their inner-Maverick and do some of that pilot....stuff.
When I was instructing, I'd make my overly analytical students calculate our turn radius at different speeds so they could see how far from the edges of protected airspace they were. Some still fretted about 1 degree heading changes...in an R-44...in turbulence...
Some people just can't be saved.
When I was instructing, I'd make my overly analytical students calculate our turn radius at different speeds so they could see how far from the edges of protected airspace they were. Some still fretted about 1 degree heading changes...in an R-44...in turbulence...
Some people just can't be saved.
MidlifeFlyer
Well-Known Member
Actually, all laps are free when it comes down to it, unless ATC tells us otherwise. The 2011 Young interpretation deals with a number of subjects, one of them leg lengths for DME holds. Not your 1-minute pattern, but sounds like it should be applicable...
it is permissible, without specific ATC clearance, to shorten published outbound DME legs in a holding pattern as long as the issued holding pattern leg length is not exceeded. If ATC verbalizes leg lengths for either a charted or uncharted holding pattern, the pilot does have to obtain ATC clearance to shorten outbound legs to less than that which has been cleared.
I think it's the fault of the way a lot of instruction is done. We teach primary student pilots to use an tiny graph on an E6B and a blunt pencil to calculate headings to the degree based on guestimates of future winds aloft and an approximation of TAS. We compound it during instrument training, treating the 70° line in the AIM-standard holding pattern entries as though being on the wrong side will lead you to fall off the edge of the earth. That would play into anyone's tendency to focus on the trees and be blind to the forest.
Bandit_Driver
Gold Member
@MidlifeFlyer you are correct and a lot of people get hung up on the 70 degree rule and the all the minutia down to some believing parallel entries are unsafe. The AIM is there for guidance only. You can blow the entry badly and if you stay inside the hold airspace you may get questioned or teased but that should be the worst of it. I always taught my students acronym NDBTOP for their hold entries based on where they end up crossing the fix into the holding pattern initially. They all passed their checkrides.
Nose
Direct Entry
Body
Tear Drop Entry
Outside
Parallel Entry
Nose
Direct Entry
Body
Tear Drop Entry
Outside
Parallel Entry
