Interestingly, with both drones the fastest flight was done with the largest & heaviest battery fitted - I think current delivery is more important than shaving a few grams off. I also have a few other props to try on each of them…then I’ll move on to my 5" ( 4S Titan DC5 and 6S Nazgul Evoque ) and 7" drones ( 6S Chimera 7 )
I don’t think that 7 satellites is sufficient on a fast moving object to get accurate speed
It’s generally agreed in the hobby/industry that 6 are needed for 3D fix on a static object.
In my experience a minimum of 8 should be used for a moving objects speed.
I’ve covered this before in previous post.
I think the @GADC_Committee should make a ruling on this as inaccurate speeds accepted to the ‘speed chart’ make a laughing stock of people’s real attempts
4 will give a fix, but will be less accurate than, say, 10. I don’t pretend to know the ins and outs of it, but with minimal sats testing in my kitchen, I achieved over 500mph. On the bench
3 satellites will form a triangle lying in a flat plane and can establish the position of a gps receiver relative to each satellite but can’t define whether it is above or below the plane formed by the 3 satellites. A 4th satellite will be able to define whether the receiver lies above or below the plane defined by the other 3 satellites.
I don’t think its as simple as that. Maybe if the receiver was receiving a tight beam from the satellite, yes, 4 would be all that’s needed. But the rf from gps is not a beam, its quite dispersed I would imagine. So the 4 point ‘triangulation’ is inaccurate.
The GPS satellites broadcast a signal with a timestamp - from the timestamp of the received signals the receiver can work out how far it is from each satellite - no beam required
I think this image helps. Its also to do with the spread of satellites. So the more the better as they are probably more spread out. A hdop figure is better at telling accuracy. I’m learning as I go…
I personally think that a proper set of rules/circumstances need to be thought out and agreed upon before any “records” are attempted. How many satellites are acceptable, is video needed, quad categories defind etc etc
Won’t that turn a bit of fun into a bit of an onerous activity - I thought the idea was to get people out flying their drones not discourage them by making them jump through hoops if they want to see and compare how fast their drones can go
Will each run need to be observed by an official, and speed both with and against the wind averaged out to remove windspeed from the equation
Im not talking about writing a 100 page rule book. Just outlining a set of rules so that everyone is singing from the same hymn book. Whats the point in having an official speed leader board if its not at least accurate and everyones following the same guide? The current leader board has rules where the flight log gets analysed and accepted. I agree it has to be fun but it also has to have tangible
Karl @notveryprettyboy has hit the nail on the head here
We should really be displaying the h-hdop figure on the OSD when doing these speed runs
Exact figure to be researched and shared by us all. I expect somewhere between 0.8 & 1.0
More to come on this I think
