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Search: Posts Made By: PDR1
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Forum: Private Flying
8th Apr 2020, 17:59
Replies: 70
Views: 12,932
Posted By PDR1

"Will this wind be so mighty as to lay low the...

"Will this wind be so mighty as to lay low the mountains of the earth?"

PDR
Forum: Private Flying
8th Apr 2020, 15:21
Replies: 70
Views: 12,932
Posted By PDR1

The effect would be transient, and very brief...

The effect would be transient, and very brief because the drag of the canopy is large compared with the momentum of the load. You can observe this by just looking at parachutists (or air-deployed...
Forum: Private Flying
5th Apr 2020, 22:19
Replies: 70
Views: 12,932
Posted By PDR1

As far as I've seen the attachment points of...

As far as I've seen the attachment points of ballistic parachutes are slightly behind the CG - presumably so that on deployment they tend to stabilise the aeroplane in a sensible attitude whilst...
Forum: Private Flying
5th Apr 2020, 12:30
Replies: 70
Views: 12,932
Posted By PDR1

This is true, but lateral velocity doesn't change...

This is true, but lateral velocity doesn't change how the vertical force of impact is experienced. The only thing that affects that is the vertical elasticity of the collision - how rapidly the...
Forum: Private Flying
4th Apr 2020, 07:49
Replies: 70
Views: 12,932
Posted By PDR1

This thread is far from unique in that respect....

This thread is far from unique in that respect. This repeated inability to understand the difference between velocity, momentum and energy is disappointing.

PDR
Forum: Private Flying
3rd Apr 2020, 20:23
Replies: 70
Views: 12,932
Posted By PDR1

Energy is a scalar, not a vector - it has no...

Energy is a scalar, not a vector - it has no direction. I believe you are confusing it with momentum.

PDR
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