The way you used the emoticons gave me the impression you were mocking the suggestion of the use of expo. Now thats quite probably me misinterpreting what you meant but thats how your postings came across to me.
XAircraft SuperX
- Thread starter envy
- Start date
The way you used the emoticons gave me the impression you were mocking the suggestion of the use of expo. Now thats quite probably me misinterpreting what you meant but thats how your postings came across to me.
X650Mouse
Take no prisoners
Well sorry for your interpretation! I certainly was not mocking Expo, some time ago either here or another forum I earnestly sort an explanation of Expo and what it could do for me as a videographer, all I got was "use expo 15 to 20% setting" when I asked what that meant, like do I put in -80% +20% etc, the post died a death with no response from anybody normally indicating nobody knew. I have a new Taranis radio learnt how to put in expo, actually did it tied to a switch but honestly got side tracked with a new gimbal which I finished installing today.
Happy to try expo but find somebody stating and or showing an improvement hard to find.
David
Last edited by a moderator:
Emowillcox
Member
Hi David curious what kind of gimbal u just installed?
We use to fly alot of RC combat and we would use expo to help tame down our planes.
We use to fly alot of RC combat and we would use expo to help tame down our planes.
X650Mouse
Take no prisoners
Hi, I actually have more comprehension about expo and winged aircraft! but my use is in a X650 quad-copter! the gimbal I have just installed is a 3 axis Arris CM3000, first flight tomorrow (it's 9 pm here now), the gimbal seems terrific and the 3 axis can be controlled from the radio FPV good idea! up to now I have used a 2 axis servo motors with a gopro, set up a video run or turning whislt on a video run has not caused issues but still I did pursue the 'expo' concept seeking perfection.
We will see how maiden flight tomorrow looks.
David
Expo & Dual Rates
A picture is worth 1000 words, a video 1,000,000?
Best videos I ever watched explaining expo...
https://vimeo.com/78585781
https://vimeo.com/78587121
https://vimeo.com/78592358
https://vimeo.com/78592359
So does this mean I just posted 4,000,000 words?
Jeff
A picture is worth 1000 words, a video 1,000,000?
Best videos I ever watched explaining expo...
https://vimeo.com/78585781
https://vimeo.com/78587121
https://vimeo.com/78592358
https://vimeo.com/78592359
So does this mean I just posted 4,000,000 words?
Jeff
X650Mouse
Take no prisoners
Good videos and I'll give you a 4 million credit However, I understand expo as it relates to elevators, ailerons, flaps and all those other things that go up and down, not a problem, understand the concept and application! what I don't understand is how expo relates to a propeller and or motor thrust!
David
SleepyC
www.AirHeadMedia.com
Has nothing to really do with the thrust, your FC takes care of that, all your stick movement has to do with is basically the angle of the craft and the amount of movement it is expected to perform. (Yes it involves thrust, but again, not directly, you are mearly telling the FC a directional command the FC decides how much thrust and where)
What expo does for your multirotor is soften the response around zero stick.
So instead of “throw” think of it as resolution.
If your stick is at ZERO (center) and can be moved to the right to go right from 0 - 100 at linear setting (no expo) and each point of the stick position has 10 points of resolution you would end up with a total of 1000 points of resolution from 0 to full right 100.
So with a linear setting (no expo) 50% right stick throw would have used 500 points of resolution to reach 50% of the available stick throw.
But by adding 50% expo (negative expo in most cases except JR which is + for some unknown dumb reason), you are now shifting these points of resolution. So to get to get to 50% of the available stick throw you are now using 666.3 points of resolution meaning you have to move the stick further to get to 50% of the throw. This softens the the stick. so you can really smooth out the flight.
The only downside is that the remaining part of the stick has less resolution so from 50% stick throw to 100% at 50% expo you only have 333.3 point of resolution. So max throw comes a lot quicker after you get past the “expo’ed” area.
But since most people who add a higher number of expo don;t BANG the sticks this never is a problem and the over all result is a much smoother flight.
hope this helps...
PS.. the points of resolution was just an example, as it’s a bit more complicated than that, BUT.. most radios have like 2048 points of resolution some a bit more.. but 1000 was a nice easy round number.
Last edited by a moderator:
X650Mouse
Take no prisoners
Yes, and thank you for taking the time to explain, I have the new Frsky Taranis and setting up things like expo is a breeze, now that the gimbals is installed I'll test out the expo 20% that I have already set, you say this should be a negative number? -20%
At the risk of being told this is rubbish! here is the very first flight this morning of my X650 Pro with Arris CM3000 gimbal and GoPro Hero 3 Silver, no post editing other than cutting for clips. I did do small movements to see how the gimbal handle the change of attitude. And I still need to set parameters to minimise props and skids
David
Last edited by a moderator:
Looks good, nicely done.
Last edited by a moderator:
If that's your first video, then please don't look up my first video. Nice job.
Jeff
Posted using Tapatalk
Last edited by a moderator:
Jeff, I was thinking the same about my first video..... hahahaha
X650Mouse
Take no prisoners
Err thanks, it is my first video with the combination of the 3 axis Gimbal and X650 Pro, I still need to find a way to set the camera parameters to minimise the props and skids, this vision has come from the beginning on a toy quad using a key cam evolving along a line using prop balancing anti jello mounts gopro cameras to 2 axis gimbals with servos to today's video seen here with sophisticated Quad, Hero 3 camera and 3 Axis gimbal with brush-less motors.
Out of all this I have come to realise everything is solvable with MONEY :nevreness: :livid:
David
Out of all this I have come to realise everything is solvable with MONEY :nevreness: :livid:
David
X650Mouse
Take no prisoners
I don't think there is much of a technique involved, you follow what the FC developer states no matter how silly you look in front of non RC people waving a quad around in the air and turning towards some unseen gods in order to get their blessings
If you don't do it you are more than likely to loose your quad in a crash or it will go where you don't want it to go.
As to location well I think a couple of kilometres in reasonably open territory but maybe down to a city block in a built up urban environment.
I can normally tell the moment my vehicle is about to lift off, if it starts to wobble or drift more than normal then I'd rather do the silly dance than be replacing props and struts. :dejection:
David
SleepyC
www.AirHeadMedia.com
I have done it with a 1000mm hex and a 1080mm Octo.. no biggie, just hold over your head, out in front of you and get it done.
VIQuad
Member
Last edited by a moderator: