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so there's all the questions about the

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gimbal video and how the craft appears

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to be rotating and what it is it is

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actually appears to be a flare some kind

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of bloomer in the IR sensor created by

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they've been slightly out of focus and

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by the shape of the optics and it's the

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glare that's rotating it's not actually

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a craft itself it's probably just a

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business jet display rotating but how

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does that happen I've kind of explained

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it before but it's it's a difficult

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thing to actually visualize you don't

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think about how the camera is mounted

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now this is a similar kind of camera

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configuration now a lot of times you'll

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see cameras mounted like this especially

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underneath helicopters the amount of so

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that they can pair like this and they

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can rotate around like this which means

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that if you want subtract something you

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just point down at the angle that

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something is moving at and then you just

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rotate the camera around and it will

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track it it's quite quite

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straightforward but with the act clear

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is that the type of camera that was

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being used in the gimbal video two-carat

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mounted like this it's melted forward

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it's facing a forward direction which

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means you can tell Nero it takes in two

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ways it rotates along a horizontal axis

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and it can rotate up and down which

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means the time from left to right texta

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quite difficult when something is

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pointed down how do you pan to go to the

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side you're actually have to tilt the

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camera up and down and that means that

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the image is going to rotate so if the

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image is rotating as something you don't

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want so what they do is inside the

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camera system Thursday think all the D

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rotating mechanism which actor takes

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that rotation corrects it and puts it

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the right way up but the camera is

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rotating which means that the glare and

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rotate this is perhaps a bit easier to

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visualize if you look at something a

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little little larger here I've done

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something that's got a similar degrees

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of freedom it's a stick with a hinge

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base

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like investigate inside these two

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funnels that cut here I can rotate it

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around the axis this is the same

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essentially as being on the underneath

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of the jet so this is rotating around

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the forward axis and it can rotate up

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and down which goes to your left and

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right if you rotate around that way so

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you found subtract something like the

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edge of this table since that something

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is running along here or flying a line

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here

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I want to distract that motion then if

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it's stop pointing over here and move to

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here you'll see this

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everything has to actually rotate this

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will be even clearer if I add on a stick

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so we can actually see the actual line

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of sight of the camera I'm just going to

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ok so now we've got the same symbols

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before but now we have this stick

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representing the line of sight of the

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cameras this is what the camera is

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looking at and that's just where the up

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direction is on the camera this will

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tell you that the horizon is going to be

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perpendicular to this up direction so if

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we subtract something over to the side

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you'll see that the cameras up Direction

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now has to move quite a bit which means

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that the camera itself has rotated which

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means that internally it has to then use

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the D rotation to get rid of that

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rotation so if we're tracking something

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from left to right you'll see it'll move

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across and then it will start tilting

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the other way so you get this kind of

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swayed actions adjust to use this as a

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way of tracking the object now in the

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gimbal video it's actually only pointing

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down a fairly small amount around 2

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degrees so that that changed things a

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little bit let me just flip this upside

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down and I will see how that affects it

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so here we've got a more shallow angle

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you think you might make the problem bit

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simpler what actually makes it worse you

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have to rotate a lot almost instantly

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with a small motion but once you've gone

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past that angle the amount of rotation

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that's needed isn't that much which

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means they knew when you get close to

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the center if the angle is very shallow

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and it's actually going to be a bit more

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child and this then you're going to get

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a more certain rotation as you cross the

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zero point the straight ahead point you

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see when it's here almost instantly with

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a small turn to the side of a few

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degrees from Auriemma nearly 45 degrees

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when it's tracking over here at a

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shallower angle it actually doesn't

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rotate frame

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something that we see in the gimbal

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video we see when it starts out it's a

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quite quite a large angle and track left

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to right this very little if any visible

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rotation when it gets the middle though

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it has to do this large Corrections

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because when you get to go the other

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direction we need to flip all the way

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over so that you can see from here to

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here that's about a 90 degree correction

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now the this isn't the only mechanism

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that the camera has for adjusting the

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rotation it also has some internal

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finer-grained stabilizers gimbal

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mechanism mechanisms inside so that will

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actually correct with a very small

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amount when you're going to land right

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over here but when you get to over here

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in the middle near a 0 0 degrees you

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need to do a much bigger correction

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which is where we see this large sudden

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turn and then another turn because it

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needs to go and start to obtain the

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other way so a big point about the

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gimbal video is that it's called the

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gimbal video and I think the reason it's

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called the gimbal video is that it's

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demonstrating essentially artifacts of a

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gimbal camera system this is they give

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abort camera systems again will dismiss

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rotations rotating mechanisms within

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other rotating mechanisms skimble this

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is essentially the same thing is with

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two axis of rotation this what we see

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here is actually something called gimbal

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lock which is a well known problem with

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limited degrees of freedom of camera

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system and this is something that

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obviously the Navy will be aware of

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perhaps they just call it this this

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video gimbal because it's the video

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being used in training perhaps the name

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itself is a clue to exactly what's going

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on you wonder why no and sort of this