Acquiring GPS almanac data

[Fred Garvin]

Seems to be a large gap between “cold” and “warm”......not so much by far between “warm and “hot”.

Since “warm” is a day or so.....what about say, 5 days? Is that a “cold” start then? 12 minutes?

Isn’t that what everyone’s been saying?

 

[AH-1G]

Seems to be a large gap between “cold” and “warm”......not so much by far between “warm and “hot”.

Since “warm” is a day or so.....what about say, 5 days? Is that a “cold” start then? 12 minutes?

Isn’t that what everyone’s been saying?

Why can I go for over two weeks and not have any issues?
Could cold start be at least a month or more?

 

[rdonson]

Why can I go for over two weeks and not have any issues?
Could cold start be at least a month or more?

Do you always fly from the same location?

 

[Photo]

Why can I go for over two weeks and not have any issues?
Could cold start be at least a month or more?

AH-1G.. your choice how you will fly. I just wanted to give you a fair advice.

 

[AH-1G]

Do you always fly from the same location?

No.
Looking back at my log book I've been as far as 73 miles difference, only a 5 days between flights.
8 days between flights 66 miles away.

 

[AH-1G]

Oh found another event 11/5 From Winter Springs, FL then to Sarasota, FL 11/17 , which I did an aerial for my sons wedding.
110 miles from my last flight

 

[jandjfrench]

Why can I go for over two weeks and not have any issues?
Could cold start be at least a month or more?

I don't know the answer to your questions but I believe it's a cause for concern. When I started this thread my concern was about the short time that the ST16 indicated that things were okay to fly when it shouldn't have had enough time to get the current data. It's my understanding that proper control of the H by the ST16 depends on their both having the same data. I've read multiple posts involving unexplained sudden movement of the H and wonder if it might be due to a data conflict. I don't know.

 

[AH-1G]

Seems others have all types of issues, and then there's those who don't.?
I've had my H for two years, go figure?

 

[Rubik]

Yuneec US informed me some time ago that when you see green "Ready" in the GPS box, you are good to go. I follow that advice without problems. Still, when I fly, my first maneuver is to hover about 10 feet away from me, about 10 feet off the ground, to make sure there is no drift.

Don't forget to calibrate the compass if your flying location has changed significantly. How far is significant? Not sure. I know that east/west moves effect the compass more than north/south moves.

 

[Photo]

Yuneec US informed me some time ago that when you see green "Ready" in the GPS box, you are good to go. I follow that advice without problems. Still, when I fly, my first maneuver is to hover about 10 feet away from me, about 10 feet off the ground, to make sure there is no drift.

Don't forget to calibrate the compass if your flying location has changed significantly. How far is significant? Not sure. I know that east/west moves effect the compass more than north/south moves.

Hi Rubik, as far as I know, if you have moved up to or more than 100km east/west/east then you should calibr. the compass. I'm still not sure that the green "Ready" is ok to fly.. for me it doesn't tell if the almanack is complet and up-to-date. That's why I always use the 12.5minutes rule when not in the the air for 3-4-5 days. Better safe than crashed..

 

[Eslader]

Why can I go for over two weeks and not have any issues?

My thoughts - take them as you will.

I'm still a noob at this whole UAV piloting thing, but I've been what most industries call a "safety officer" in the past, training people how not to die when dealing with equipment in my industry that can easily kill them. I tend to take conservative approaches to safety.

I follow a "prove this is safe" rather than a "prove it's not safe" internal guideline. Which means that even though I don't have the answer to your question, the fact that I don't have the answer to the root of your question (*can* I go for 2 weeks and not have issues, guaranteed) means I'm going to play it conservatively and assume my almanac needs a cold-start any time the GPS has been off for more than a day.

When I was training people on safety in my industry, and telling them not to do something for safety's sake, I'd often get the question "but at my last job we did it that way and never had a problem." I had several examples (complete with unpleasant video) of people who did what they wanted to do and got killed, or permanently disfigured and disabled by doing it.

But I would also tell them about the Challenger shuttle disaster. NASA knew the booster's O-rings were getting burned through by combustion gasses. They knew the problem got worse as the temperature got low. But they took the fact that they had flown 24 times before without killing anyone as evidence that the shuttle was safe, rather than just as evidence that they got lucky and got away with flying a dangerous vehicle.

They took a "prove it's not safe" approach to flight safety when they should have demanded proof that it was. And the result was that they killed 7 people, cost themselves (and therefore us) over 3 billion dollars, and did severe damage to their reputation and the US space program, the effects of which we're still feeling today.