General Category > DB Cooper
Flight Path And Related Issues
dudeman17:
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Register or LoginRobert, you're arguing against Chaucer's calculated reasoning, but you seem to be agreeing with his basic point, which is that if Cooper goes in, he's pretty close to his exit point, which is correct. No, I don't have a degree in physics, but sadly, I've watched a number of people do it.
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Thank you.
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"Pretty close" and "almost directly underneath" are two different things.
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Nah. Come on, Robert, I think you're arguing for the sake of being argumentative. Chaucer's not trying to pinpoint Cooper's crater, hell, the jet itself can not be pinpointed. He's just looking for parameters with which to work his Tena Bar money theory.
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Let me see if this will clarify things a bit. If the Cooper airliner ground track has a crosswind component, he will land downwind of that track if he is a no-pull. If the Cooper airliner ground track has a headwind component, he will not land downwind of his jump point on that track if he is a no-pull.
Keep in mind that the maximum wind at 10,000 feet was about 35 knots at the time Cooper jumped and less than that at lower altitudes. Also, keep in mind that Cooper will be on the ground and deceased in not more than 60 seconds if he is a no-pull.
If Cooper jumps in a hurricane with 200+ MPH winds, the above does not apply and all bets are off. :)
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It was clear the first time you said it, and it isn't anything that I don't already know. But you seem to be arguing, yet your ultimate conclusion is the same as mine - If Cooper is a no-pull, then he doesn't end up too awfully far from his exit point. And I think that's all that Chaucer was after.
Robert99:
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Register or LoginI'm assuming DBC jumped at 8:13. If the jet was 23 DME at 8:18 then DBC jumped 5 minutes earlier. Back tracking 5 minutes along the Western Flight Path from 23 DME is about 16 miles north and puts the jet very near Tena Bar.
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Actually, EU, I thought the same thing but in regards to the FBI path. Backtracking 5 minutes along the FBI flight path, would put an 8:13 jump spot very near the Columbia.
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Unless Cpr is an expert and drops then opens at about 1000ft feet, he is going to drift no matter the flight path. He will not land in the Columbia or at Tina Bar in any event even with a jump at 8:13. There is no scenario that drops money at the Ingram find location on Tina Bar. This isnt a murder where a body drops in place to be found 8 years later in the same place! ;)
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But if he no-pulls, then drift doesn’t become an issue. If he jumped near the Columbia then the plane is flying into the direction of the wind. That would negate the forward throw, correct?
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The last comment above is the original Chaucer post and comment on drift if Cooper was a no-pull.
Replying directly to Chaucer's comments, statements, or whatever:
1. Drift is always an issue if the wind is blowing. It may be a big issue, a medium issue, or a little issue, but it is an issue.
2. Cooper jumped very near or over the Columbia River and the 35 knot wind at 10,000 feet was from 45 degrees off to the right of the airliner's track. Note that the track of the airliner was very close to 180 degrees true and the wind was from 225 degrees true.
3. Since the wind is from 45 degrees off the track, in this case the headwind and crosswind components have the same values. The headwind component would move Cooper back toward the jump point and the crosswind component would move him downwind from the track. He will not return to the original geographical jump point under any conditions but he will be in the neighborhood. Keep reading below.
The instant that Cooper separates from the airliner, he is subject only to gravity and his body aerodynamics. Once Cooper's horizontal motion with respect to the air mass has ceased, his horizontal motion and the air mass horizontal motion are the same. So when the "forward throw" comes to a stop, Cooper will already be slightly downwind of the track and maybe 1500 or 2000 feet below the 10,000 foot jump altitude. From that point, it is strictly straight down with respect to the air mass. And the air mass is moving horizontally at the wind speed.
There are two different frames of reference at play here. The aerodynamics are determined only with respect to the air mass. The geographical locations must take into account the fact that the air mass is moving with respect to the geography. Be sure to keep them straight.
DBfan57:
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Register or LoginBut once again I will ask, as I have asked some others, if he pulls the chords on either side, would it not give him at least some ability to alter the course of his landing spot? They have emphasized he had non steerable chutes. But couldn't you have a bit of control because it would have to change your direction if you pulled the chords? Sir Isaac Newton if you will. To some degree. To avoid hitting the water, if he was near the water.
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I have heard on Podcasts that there were 50 mile pr hour winds that night? Perhaps gusts? But it was certainly windy and raining. That you cannot argue
I have to laugh. Maybe you'll believe it now, but I should probably make a side bet with 377 about how long it will be before you ask that same question again. Not sure if Mr. Newton was a rigger, and no disrespect for his intellect, but I bet 377 and I both have more jumps than he does.
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Register or LoginBut if he no-pulls, then drift doesn’t become an issue. If he jumped near the Columbia then the plane is flying into the direction of the wind. That would negate the forward throw, correct?
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Pretty much what R99 said. You are pretty much correct in that if Cooper no-pulls, then drift isn't much of an issue. The forward throw will still happen regardless of winds, but it dissipates pretty quickly. High upper winds can cause some freefall drift, but not a whole lot. His body position could cause some 'slide', but again not a lot. Someone who no-pulls (or streamers) will end up pretty close to their exit point. Unfortunately, I witnessed my first one of those when I was about six.
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I assure you I am not asking again about the pull on the chord here. But your take on the no drift in that kind of a wind storm they had reported is laughable to me
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What "wind storm" are you talking about? The highest winds measured in the Portland area at 10,000 feet were about 35 knots and less than that at lower altitudes.
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Chaucer:
I thought my point was clear. Of course Cooper isn't going to fall directly straight down and land precisely underneath the spot he jumped from. I was merely making the point that:
1. Drift is not as much of an issue with a no-pull than it is when one deploys his chute.
2. Forward throw would be mitigated by headwinds to a certain degree.
2. If Cooper jumped over the Columbia, say between the I-5 bridge and Pearson Air Park, then he is likely going to end up somewhere between the I-5 bridge and the Pearson Air Park on the ground.
I'm not seeing how any of those statements are particularly controversial, and I'm not understanding why Bob is being didactic about it.
dudeman17:
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Register or LoginI thought my point was clear. Of course Cooper isn't going to fall directly straight down and land precisely underneath the spot he jumped from. I was merely making the point that:
1. Drift is not as much of an issue with a no-pull than it is when one deploys his chute.
2. Forward throw would be mitigated by headwinds to a certain degree.
2. If Cooper jumped over the Columbia, say between the I-5 bridge and Pearson Air Park, then he is likely going to end up somewhere between the I-5 bridge and the Pearson Air Park on the ground.
I'm not seeing how any of those statements are particularly controversial, and I'm not understanding why Bob is being didactic about it.
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And as someone with over four decades of first hand experience with human bodies in freefall, I'd say that you are correct. With the slight caveat that I don't know how far it is from the I-5 bridge to Pearson Air Park.
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Robert, I'm not sure what the psych profile is that you feel the need to argue with people with whom you are ultimately not disagreeing. And your calculations, such as they are, are missing at least three factors. I don't know where you live or what your physicality is, but ultimately I would say, put down your slide rule, close your textbooks, come out to 'Snore and I'll show you.
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