Posted by Tj Bordelon on December 31, 2009 at 12:44pm
Here in Boston, we have snow and wind. Not good for testing landing code. I hope to have some time in a few weeks to test and post the results of my new landing code. The old landing code can be seen in this video. Unfortunately coming in for a single approach like this has the EZ-STAR touching down at 28mph, and taking about 800 feet to land. The new landing code which I flew a few weeks ago does it in 300 feet.The new idea is to circle in a radius of 125 feet, exit the loiter once the plane has descended to roughly 40 feet altitude, deploy flaps, and use throttle to control altitude while holding a fixed angle of attack. This worked 4/5 times for perfect touchdowns at 15 mph!! The 5th time crashed because the battery died unexpectedly. (I ignored the low battery alert so that's my fault.)I know some of you out there argue auto land is a waste of time, but I like the idea of my plane having a failsafe that will take it to the nearest waypoint and land. Imagine what happens if a dog pees on your ground station! Things like this do happen, and autoland will save you.
Really good, and I like your approch to the problems of a uav's. My problem is that I'm about as new as you can get and I read all the informatiom you put on your web, but Im still in the dark. Are you going to make all this information available to share, sale??? anything???
How about using a ultrasonic sensor comes in play for last 10' , why is this device not used in any if DIY AP? Can any one pls enlighten me pls regarding issues of using ultrasonic altitude sensor for first /last 5 mts ? How to use it in current boards in some manner, any idea is appreciated. Thanks. .
Do you use a pitot tube and pressure sensor for avoiding stalling on landing? (holding the pitch of the plane with the autopilot while slowing down too much will eventually stall it).
Do you use GPS for height indication?
Do you have other height sensors, like e.g. a barometric sensor?
Can you give some more details of your landing algorithm?
Tj, That landing was as good as it gets in my book for autolanding sequence :) Landing was at constant ange of approach , impressive, how does it behave with mild wind in autoland mode. Many can't do that in manual mode :)) . good work
Comments
Do you use a pitot tube and pressure sensor for avoiding stalling on landing? (holding the pitch of the plane with the autopilot while slowing down too much will eventually stall it).
Do you use GPS for height indication?
Do you have other height sensors, like e.g. a barometric sensor?
Can you give some more details of your landing algorithm?
UFO_MAN
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