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The problem is, all normal gimbals reference "level" off their accelerometers alone and they
all drift off level during sustained G-loading so if I purposely introduce any roll or pitch to follow the aircraft angle the net result is aircraft roll angle + level error. What I want is a gimbal that doesn't bother with absolute "level" and just follows the aircraft's average attitude. If the aircraft is level, the gimbal is level. If it's banked, it follows the bank just like yaw follow does (which doesn't use the accelerometers either). The Feiyu Tech gimbals are special in that they have position encoders inside the motors so they actually can measure their own angle away from center, which is one reason they recover so quickly if you knock them completely off angle, and why yaw follow works very well. What I need is for Feiyu Tech to provide roll/pitch follow referenced from center (just like their yaw follow) but they're not interested. And no other gimbal controller can do what they do without those position encoders. They'll always drift off center eventually. |
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BTW, did any of you notice the videos from the new 2m Opterra wing? To me they look less bumpy than what I typically get from the X7.
Anybody else noticed that? Took the X7 out this morning for a 43km round trip over the sea . Wind was light at 10-12km/h and fairly linear at sea, so the video isnt too bad: https://youtu.be/V1ERNhdqXfE?t=14m22s |
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Last edited by mike_o; Feb 15, 2017 at 07:11 AM.
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I havent had any trouble with my storm32 board drifting, it's excellent and does follow-mode for a plane-like feel too.
I stopped flying my X8 for the same reason, unless conditions were calm or i was flying near the coast in smooth wind, the footage was generally terrible. This is my best X8 footage probably, windy as hell, but the wind coming off the sea was smooth until I went inland far enough
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I'm talking about what happens when you fly say a 360 degree turn with a plane. Whether it's the IMU in a gimbal or the one in the flight controller, I always see em drift off level (can see it in the AHI for the FC) because the accelerometers get confused with any sustained G-loading. Then it takes a while of flying straight before they slowly return to level. |
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On a plane... You could be right about there being a small amount of drift after a heavy turn, but not much that ive seen. Here are a couple of vids of the storm32 on a plane if they're useful.
This is with firmware version 1.6, about 18 months old At about1:30 there is a 360 but it's fairly gentle. Does look like there is a small drift at the end
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So what battery setup and layout is everyone using.
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What do you suggest for starting some LD FPV out here in colorado? |
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I've been flying mine now since last spring and it has never gone home without spinning in at least once. I've been flying 'wings for over 15 years now, and this one has THE worst flying characteristics I've ever seen in a (straight, IE undamaged) airframe. I've messed with increasing the winglet area and it's now over 200% of stock, and this helped a lot but it will still enter the death spin with little warning. The rule with this bird is to fly it fast and keep it fast and no tight turns unless you're hauling, if you're noodling around at the lower end of the speed range and turning tight, you will stuff it. It's a gorgeous bird...and a crap foil design. I'm likely biased because I'm a slope flying pilot first and power flyer second, and I spend most time with the throttle off. Of course, this reveals tends to reveal the worst handling characteristics of any airframe. But as a biased glider guider, my argument is that if it can't fly well without the engine, it doesn't actually fly well anyway. It's such a pretty bird I keep flying it, but god it handles like crap unless you keep power on and/or speed up. And watch turns that's where it's gonna bite ya |
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Last edited by MtnGoat; Mar 06, 2017 at 01:10 PM.
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If the goal is mix medium range (4-10 miles) then Skyhunter can brute force it with a lot battery, and is way easier to launch and much more forgiving of being man handled. |
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One might say, after my mods and versions, I'm still trying to make a silk purse out of a sow's ear. The version shown in post# 10509 is a good example. The Falcon flying wing is another example of good aesthetic design ruined by aerodynamic incompetence. Tooling's wrong, wrong. Left wing has a different airfoil than the right wing. I kid you not! (I posted all about this on the Falcon forum.) |
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Last edited by wazoo22; Mar 07, 2017 at 04:34 AM.
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oh my, I better get rid of my most efficient wings right away
While I can relate to some of the criticism, I also have to admit that I'm quite happy with the two platforms. My Falcons cruise 60km/h at 30W and the X7 (same wings as X8) cruise at the same speed at 40-50W. Only my 155cm Scout Bee wing can compete with that, but is has no fuse for FPV gear and big batteries.
A lot of wind on this test (mainly circling), normal cruise speed is around 60km/h Not even my Talon or Mini Talon are down to those figures. I haven't spun my X7 yet, and the last Falcon spin I had was several years ago. As I said elsewhere, my recipe for stall/spin avoidance is "build light and fly fast" Currently my biggest issue with the Skywalker wings are their bumpiness, but that may be worsened by the light weight... |
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Last edited by mike_o; Mar 08, 2017 at 05:37 AM.
Reason: added video
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Again, all true (can't vouch for the power numbers). All airframes are a trade-off. It's just that it could have been so much better. Imagine the X-8 with a wing airfoil by any of several good designers, like Martin Hepperle. Straight out of the book, they'd slaughter the one that's on the thing, in performance and efficiency. And to fail to make both wings the same airfoil is just absurd. I have a new X-8 in the box, if it has not warped into unusability, and I am considering razor-planing the wing into a better section, if I can get one that will allow me to keep away from the carbon stiffeners or spar, and will fit inside the root-tip sections. Plan to ask Daemon to recommend a section- he's really far better at judging that than I am. Save
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hi guys, i've a problem with my x8 landing
why i'm always crash it on 5 time i'm flown it and it 5 time also it crash :lol my question is, how you guys landed x8? fyi: i've many plane but just x8 i've problem with landing any input will be appreciate Thank You !!
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