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Search: Posts Made By: MeddlMoe
Showing results 1 to 12 of 12
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Forum: Rotorheads
24th Dec 2020, 09:37
Replies: 146
Views: 24,615
Posted By MeddlMoe

No I mean 180 degrees peak to peak. The...

No I mean 180 degrees peak to peak.

The maximum "rate of flap up" i.e. the vertical speed is reached at the end of upward cyclic component of the aerodynamic force that is controlled by the AoA,...
Forum: Rotorheads
23rd Dec 2020, 15:48
Replies: 146
Views: 24,615
Posted By MeddlMoe

Can you explain in more detail, why you think...

Can you explain in more detail, why you think that pure aerodynamic forces applied as a sinusoidal function of time would not lead to 180 degrees phase shift?

0 degrees - - >acceleration...
Forum: Rotorheads
23rd Dec 2020, 11:12
Replies: 146
Views: 24,615
Posted By MeddlMoe

No, this would only be the case if the flapping...

No, this would only be the case if the flapping hinge offset was zero. The real flapping hinge offset is 2-6% for articulated rotors and 6-18% for "rigid" rotors (hingeless or flexbeam rotors)
...
Forum: Rotorheads
23rd Dec 2020, 10:57
Replies: 146
Views: 24,615
Posted By MeddlMoe

The off axis torque that is induced in a rotor...

The off axis torque that is induced in a rotor system is the cyclic component of the aeodynamic forces. This creates extra lift on one side of the mast and reduced lift on the other side. Lets say...
Forum: Rotorheads
21st Dec 2020, 20:50
Replies: 146
Views: 24,615
Posted By MeddlMoe

Congratulations, you have hereby explained how...

Congratulations, you have hereby explained how the gyroscopic effect works on a rotor blade.

What is next? There is no such thing as friction, it is just collisions between micro-structures and...
Forum: Rotorheads
20th Dec 2020, 13:15
Replies: 146
Views: 24,615
Posted By MeddlMoe

It just so happens that I used to work on rotor...

It just so happens that I used to work on rotor analysis for many years. I don't know what kind of engineers you have been talking to, but they seem to be not very good, or more likely you have...
Forum: Rotorheads
19th Dec 2020, 18:07
Replies: 146
Views: 24,615
Posted By MeddlMoe

Vessbot give it up! they are not going to...

Vessbot give it up!

they are not going to admit that they are wrong, and they won't engage in a physics based discussion.

They will ignore the phsics parts of your arguments the same way they...
Forum: Rotorheads
18th Dec 2020, 17:53
Replies: 146
Views: 24,615
Posted By MeddlMoe

The lock number has very little influence on the...

The lock number has very little influence on the phase lag. (It is also not the delta 3 angle, as somebody else claimed)

The phase lag is predominantly determined by the flapping hinge offset....
Forum: Rotorheads
18th Dec 2020, 10:46
Replies: 146
Views: 24,615
Posted By MeddlMoe

This is not correct. The Lock number has very...

This is not correct. The Lock number has very little to do with it.

The critical parameter for the phase shift is the relative flapping hinge offset. This is the ratio between the distance of the...
Forum: Rotorheads
17th Dec 2020, 08:33
Replies: 146
Views: 24,615
Posted By MeddlMoe

I think here is a fundamental misunderstanding by...

I think here is a fundamental misunderstanding by some of you:

The coriolis effect, gyroscopic effect, and centrifugal force are not some kind of "extra physics" or "magical effects" that occur on...
Forum: Rotorheads
15th Dec 2020, 16:37
Replies: 146
Views: 24,615
Posted By MeddlMoe

Of course I did not consider the roation of the...

Of course I did not consider the roation of the earth (indeed negledible for a helicopter rotor), but the rotation of the rotor.

The Coriolis force appears in a rotating coordinate system when...
Forum: Rotorheads
15th Dec 2020, 07:35
Replies: 146
Views: 24,615
Posted By MeddlMoe

The rotor blades are often analyzed in a...

The rotor blades are often analyzed in a coordinates system that rotates with the rotor blade, has its origin in the rotor center, and a primary axis parallel to the (coned) pitch axis. In this...
Showing results 1 to 12 of 12


 
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