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Search: Posts Made By: [email protected]
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Forum: Rotorheads
24th Dec 2020, 15:53
Replies: 146
Views: 24,615
Posted By [email protected]

If you mean that the journey around the...

If you mean that the journey around the swashplate can be considered as half uphill and half downhill with two 'neutral' positions in the middle, then from one neutral position, the blades start...
Forum: Rotorheads
24th Dec 2020, 08:20
Replies: 146
Views: 24,615
Posted By [email protected]

Then try doing it at night:)

Then try doing it at night:)
Forum: Rotorheads
23rd Dec 2020, 16:14
Replies: 146
Views: 24,615
Posted By [email protected]

Or you could just say the rotor is not rigid in...

Or you could just say the rotor is not rigid in space - if you were to constrain a gyro in the way you suggest, secondary precesssion would occur but this doesn't happen either.

No, this is...
Forum: Rotorheads
23rd Dec 2020, 14:44
Replies: 146
Views: 24,615
Posted By [email protected]

Or in fact by a reduction in the upward force due...

Or in fact by a reduction in the upward force due to the reduction in pitch angle and AoA as explained earlier and the reason it is around the 90 degree mark.

And you have completely forgotten the...
Forum: Rotorheads
23rd Dec 2020, 05:32
Replies: 146
Views: 24,615
Posted By [email protected]

With apologies to Casabianca: The cab sat on...

With apologies to Casabianca:

The cab sat on the pitching deck,
Blades spinning round the head;
The gyro force that would try to wreck,
Was missing feared dead.

Yet steadfast were the...
Forum: Rotorheads
23rd Dec 2020, 05:18
Replies: 146
Views: 24,615
Posted By [email protected]

Nice one Megan:ok: that is an inconvenient truth...

Nice one Megan:ok: that is an inconvenient truth for the pro-gyro clan, the lack of rigidity in space mentioned by AC a while ago and ignored by the playground bullies:)
Forum: Rotorheads
22nd Dec 2020, 06:59
Replies: 146
Views: 24,615
Posted By [email protected]

Since there is no aero force, the pitchrods will...

Since there is no aero force, the pitchrods will follow the swash plate uphill and down, altering the pitch of the blades but also pulling them down and pushing them up a little - no phase lag and no...
Forum: Rotorheads
21st Dec 2020, 18:19
Replies: 146
Views: 24,615
Posted By [email protected]

But take that rotor and put it in space - or...

But take that rotor and put it in space - or other convenient vacuum :)- and leave the swashplate 'uncorrected', the blades will follow the pitch change rods faithfully but without the phase lag.
...
Forum: Rotorheads
21st Dec 2020, 10:31
Replies: 146
Views: 24,615
Posted By [email protected]

MeddleMoe - I realise I didn't answer your...

MeddleMoe - I realise I didn't answer your question:

As a blade moves round the rotor disc, the pitch change rods follow the swash plate, changing the pitch of the blades and thus their Angle of...
Forum: Rotorheads
21st Dec 2020, 08:29
Replies: 146
Views: 24,615
Posted By [email protected]

When a gyro precesses, it takes its spin axis...

When a gyro precesses, it takes its spin axis with it and, if you tried to restrain that spin axis somehow, it would create strong torques that could induce secondary precession effects.

When a...
Forum: Rotorheads
20th Dec 2020, 09:46
Replies: 146
Views: 24,615
Posted By [email protected]

So, after many years of helicopter design,...

So, after many years of helicopter design, construction and operation it turns out the whole industry has been getting it wrong because they didn't realise it is all about precession - thank goodness...
Forum: Rotorheads
20th Dec 2020, 09:44
Replies: 146
Views: 24,615
Posted By [email protected]

yes but only when they are willing to listen:)

yes but only when they are willing to listen:)
Forum: Rotorheads
19th Dec 2020, 16:44
Replies: 146
Views: 24,615
Posted By [email protected]

I couldn't care less what the FAA do or say,...

I couldn't care less what the FAA do or say, doesn't affect me in any way shape or form:):ok:
Forum: Rotorheads
19th Dec 2020, 12:57
Replies: 146
Views: 24,615
Posted By [email protected]

It is your belief that because it spins it is a...

It is your belief that because it spins it is a gyro - it is my belief that it is not - I fly a rotor system that is subject to constantly changing aerodynamic forces - if everyone of those produced...
Forum: Rotorheads
19th Dec 2020, 12:01
Replies: 146
Views: 24,615
Posted By [email protected]

Agreed AC - the idea that the rotor is a gyro...

Agreed AC - the idea that the rotor is a gyro just because it spins is clearly entrenched in the theorists view - I lack the science and maths depth of knowledge to counter argue beyond what I know...
Forum: Rotorheads
18th Dec 2020, 17:12
Replies: 146
Views: 24,615
Posted By [email protected]

If a toy gyro isn't rotating at high speed it...

If a toy gyro isn't rotating at high speed it falls over so it does matter.

Of course you can but that is just applying additional torques and muddying the waters of what is discussed here

The...
Forum: Rotorheads
18th Dec 2020, 16:32
Replies: 146
Views: 24,615
Posted By [email protected]

So, unlike a gyro, there are countless other...

So, unlike a gyro, there are countless other factors that affect flapping - yet people are still adamant a rotor is a gyro?
Forum: Rotorheads
18th Dec 2020, 16:18
Replies: 146
Views: 24,615
Posted By [email protected]

So why does a teetering rotor not exhibit exactly...

So why does a teetering rotor not exhibit exactly 90 degree phase lag and why does that change with density altitude when there are no hinges or hinge offsets to consider?
Forum: Rotorheads
18th Dec 2020, 05:49
Replies: 146
Views: 24,615
Posted By [email protected]

What RPM do most gyros rotate at? Even with...

What RPM do most gyros rotate at?

Even with his cardboard disc, the precession demonstrated is 90 degrees - as you have already been told, phase lag is frequently not 90 degrees, with some very...
Forum: Rotorheads
17th Dec 2020, 21:25
Replies: 146
Views: 24,615
Posted By [email protected]

Vessbot - I get the impression you know a lot...

Vessbot - I get the impression you know a lot about physics but very little about helicopters.

Phase lag is governed by Lock number which is a ratio between blade inertia and aerodynamic damping....
Forum: Rotorheads
15th Dec 2020, 16:29
Replies: 146
Views: 24,615
Posted By [email protected]

If a bolt detaches itself from a blade root...

If a bolt detaches itself from a blade root whilst the rotor is turning, does it end up along the same blade at the tip? Nope - Coriolis Effect is an apparent deviation in a rotating system, even a...
Showing results 1 to 21 of 21


 
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