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Speed Helicopters Speed Helicopters. Any brand as long as it goes FASSSSSSSSSTTTTTT!


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Old 10-25-2016, 10:19 AM   #181 (permalink)
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Way to go Wayne!!! So that's what you been up to!!! Cool stuff brother!!!
Living the dream! Ya need to dust off those machines and bring them out to see just how fast they really go.
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Old 12-19-2016, 05:31 PM   #182 (permalink)
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Living the dream! Ya need to dust off those machines and bring them out to see just how fast they really go.
Wayne,
Funny you should say that, I just finished a complete rebuild of my speed heli. New everything bearings, links, shafts, etc... So it won't be long before I get out there, also the big one is coming soon!!!
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Old 12-19-2016, 11:10 PM   #183 (permalink)
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Wayne,
Funny you should say that, I just finished a complete rebuild of my speed heli. New everything bearings, links, shafts, etc... So it won't be long before I get out there, also the big one is coming soon!!!
Jay,
Just say when and I'm out there. I set up the sleipnir speed system quite often. Have a go fast airplane too, extreme flight Outlaw with EDF 90 motor, sounds like an F1 race car. Had it up to 180mph with a little breeze.
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Old 12-20-2016, 06:27 AM   #184 (permalink)
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Jay,
Just say when and I'm out there. I set up the sleipnir speed system quite often. Have a go fast airplane too, extreme flight Outlaw with EDF 90 motor, sounds like an F1 race car. Had it up to 180mph with a little breeze.
Wow!!! That sounds like fun Wayne!!! Ok let me get my self together and I will get back to you... Still have a few things to do..
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Old 07-11-2017, 03:23 PM   #185 (permalink)
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I have an update to the Sleipnir system. Again it's the jitter, I try to miminize. I believe I have this down to pretty much nothing now (a single millisecond).

What I have done is implement a "jitter filter" instead of an ugly sleep (Which do work ok) in the code I had before. The camera don't drop frames, and the jitter filter pretty much calculate the exact framerate of the camera and timestamps images on that. If the framerate changes (temperature for example), the filter catches that in a couple of seconds. These are small, small changes. But very important.

This should put the Sleipnir system in the accuracy range of about 1 hundred of a second over the speed run. That is an error of +-1kmh on a 300kmh 200m run. So pretty accurate.

The update can be pulled from github.
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Old 07-11-2017, 11:44 PM   #186 (permalink)
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Linus, Thanks for the update. Suggest rebuild Sleipnir base and pod or incremental update?
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Old 07-11-2017, 11:52 PM   #187 (permalink)
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Thks Linus, same question as above, rebuild or update?
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Old 07-12-2017, 12:35 AM   #188 (permalink)
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Great work Linus. Looking forward to trying this out sometime in the future
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Old 07-12-2017, 12:57 AM   #189 (permalink)
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You need to rebuild the pods. Just do a "git pull". And cd to "sleipnir-pod/sleipnir" and run the build script.

You also have to remove "--sleep XXX" from your record file (start script). Since it's no longer applicable.
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Old 08-08-2017, 08:09 AM   #190 (permalink)
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I just got an idea I need to share for Sleipnir. I call it the bug killer, but could potentially be used for making detection easier.

I ordered myself 4 of these on ebay, for peanut money.. It's USB microphones.



Now the idea here is to record the sound of the aircraft, and use that as an logical "AND" if trigger should happen. No sound, no trigger, volume configurable. These should be put on the Camera pods, which already provides USB ports.

To make it even better I was thinking of having two mics arranged as this picture, seen from above, exceptional painting skills. Hopefully what I'm aiming for is coming through...



Now, you may not need to configure the volume anymore, but instead the volume difference between mic1 and mic2. If they have at least some sound and it's fairy even volume, it can trigger.

Extremely hard to say if it will work, how well it will work, if it adds more complexity than it's worth, what will be needed to wind-proof this etc, etc, etc... But I think the basic idea is sound and will play with this a bit when the mics (ordered from china) arrive.

If this works there will be no more "bug beeps" from Sleipnir, and perhaps I could even up the sensitivity a bit on the image recognition to make it even better catching the aircraft. Yes, it is good now, but with more input data, it can always be better.

So there may be some Sleipnir development in the upcoming future!
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Old 08-08-2017, 09:04 AM   #191 (permalink)
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Love your concept and drawing!

You may be able to add a consistency check on the speed as well as have another method to determine speed by removing the sound barrier, separating the mics a bit along the flight path and track the difference in volumes. I think the vertical speed component will be removed from the equation too.
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Old 08-08-2017, 02:09 PM   #192 (permalink)
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The idea is to use the mics as a rough "window" where the camera can trigger. and they are operated from the pods, which means they have to be at least within a something like a meter from the pods. By directing the mics and have a sound barrier between them I'm hoping to see a difference in volume between them when the aircraft are on the left or right side of the pod.

If the volume difference is large, you are not in the window. If the difference is small, you are in the window for the camera to actually trigger a pass.

There are quite a bit of uncertainty in this, but it's cheap and I think I can easily make a test rig for this to see if it's even feasible... I am 100% NOT a sound engineer, so it may come out as not applicable.. Or too hard to adjust.. Don't know yet, but worth a try.

It has to be easy to operate, Sleipnir takes enough time as it is to set up.

Edit:
Of course, now when thinking about it... If putting the mics 1 meter at either side of the pods I may be able to actually measure when in time the sound hit the pods, time difference between the two mics. Small time difference equals aircraft closer to the "window". That would take some serious processing to match up the sound though, and the mics probably have unspecified latency... But perhaps feasible.
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Last edited by LinusLarsson; 08-08-2017 at 02:20 PM..
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