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Search: Posts Made By: HissingSyd
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Forum: Rotorheads
25th Mar 2020, 10:31
Replies: 115
Views: 26,772
Posted By HissingSyd

I wondered whether to mention dynamic rollover....

I wondered whether to mention dynamic rollover. In this case there is a pivot and it is critical to what happens. Is this thread-drift too far now?
Forum: Rotorheads
24th Mar 2020, 16:54
Replies: 115
Views: 26,772
Posted By HissingSyd

Don't forget I am also ex-RN. Are you posing a...

Don't forget I am also ex-RN. Are you posing a problem of ship stability with CG and Centre of Flotation? ;-)
Forum: Rotorheads
24th Mar 2020, 15:24
Replies: 115
Views: 26,772
Posted By HissingSyd

When the aircraft is moving all bets are off as...

When the aircraft is moving all bets are off as far as I am concerned. What happens does depend on the position of the CG but also in the Centre of Inertia, which is probably as far as this forum...
Forum: Rotorheads
24th Mar 2020, 14:02
Replies: 115
Views: 26,772
Posted By HissingSyd

Here is a secret. Physicists prefer to deal with...

Here is a secret. Physicists prefer to deal with steady state conditions because they are relatively easy to analyse. They ignore how the steady steady was arrived at. Sometimes you can fudge the...
Forum: Rotorheads
24th Mar 2020, 10:45
Replies: 115
Views: 26,772
Posted By HissingSyd

All that is familiar, but it is describing the...

All that is familiar, but it is describing the dynamic response and analysing that is way beyond my pay grade.
Forum: Rotorheads
24th Mar 2020, 10:41
Replies: 115
Views: 26,772
Posted By HissingSyd

The essence of a helicopter in the hover is that...

The essence of a helicopter in the hover is that it does not move or rotate - it is in static equilibrium - and there is no axis of rotation. It means that the sum of linear forces is zero and the...
Forum: Rotorheads
23rd Mar 2020, 10:24
Replies: 115
Views: 26,772
Posted By HissingSyd

I do not know how long ago that was, but when I...

I do not know how long ago that was, but when I started teaching PoF in the 70s they were still quite widespread. Even Shawberry was turning out QHIs with traces of them. Their teaching materials...
Forum: Rotorheads
23rd Mar 2020, 09:58
Replies: 115
Views: 26,772
Posted By HissingSyd

I am ok on this one, I hope. A couple is a vector...

I am ok on this one, I hope. A couple is a vector - it has direction and magnitude. The direction for a couple is parallel to the axis of rotation. It does not have a point of application as such. -...
Forum: Rotorheads
23rd Mar 2020, 09:32
Replies: 115
Views: 26,772
Posted By HissingSyd

Good morning everyone. It is only the exceptional...

Good morning everyone. It is only the exceptional circumstances I find myself in that have tempted me out of my shell. I hope I can be forgiven for raising a bit of diverting controversy.

I have...
Forum: Rotorheads
22nd Mar 2020, 16:54
Replies: 115
Views: 26,772
Posted By HissingSyd

Nil, of course, but I did once read a lot of...

Nil, of course, but I did once read a lot of information from Westland, Boscombe Down and what I think is now the US DCIT. I also had some access to the Sikorsky manual mentioned in the parallel...
Forum: Rotorheads
22nd Mar 2020, 15:00
Replies: 115
Views: 26,772
Posted By HissingSyd

I am sitting here isolating myself, so I am up...

I am sitting here isolating myself, so I am up for the challenge, in a friendly way.:)

While I have been lurking here, I have read back over a number of threads to which NL has contributed and I...
Forum: Rotorheads
22nd Mar 2020, 13:59
Replies: 115
Views: 26,772
Posted By HissingSyd

I am certain that it did. Mighty Gem and Arm...

I am certain that it did.

Mighty Gem and Arm out the window provided simple and accurate explanations at #2 ad #9, only for Nick Lappos to confuse things with incorrect statements at #10 and #26....
Forum: Rotorheads
22nd Mar 2020, 12:09
Replies: 115
Views: 26,772
Posted By HissingSyd

Maybe, but some simplifications are possibly...

Maybe, but some simplifications are possibly counter-productive.



Much the same as mine, but I have been back to school for a second career since. :)



Every couple has its moment, as I...
Forum: Rotorheads
22nd Mar 2020, 10:46
Replies: 115
Views: 26,772
Posted By HissingSyd

You clearly understand what is going on, but what...

You clearly understand what is going on, but what you have written above could still be confusing. An accurate explanation must use the terminology correctly.
When introducing levers in elementary...
Forum: Rotorheads
21st Mar 2020, 19:33
Replies: 115
Views: 26,772
Posted By HissingSyd

No, you do not. There is no pivot with a...

No, you do not. There is no pivot with a helicopter in the hover. A couple is a couple is a couple.

And every couple has its moment, it does not have a pivot.

This is a matter of static...
Forum: Rotorheads
21st Mar 2020, 18:27
Replies: 115
Views: 26,772
Posted By HissingSyd

That is not how physics works. The C of G is only...

That is not how physics works. The C of G is only relevant as the point through which the weight (gravity) can be considered to act - hence the name. Otherwise there are just the equal and opposite...
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