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Search: Posts Made By: Sokol
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Forum: Tech Log
21st Dec 2019, 19:56
Replies: 7
Views: 1,459
Posted By Sokol

I am just asking myself where you got that quote...

I am just asking myself where you got that quote from.

Advances in Airfoils can differ from higher stiffness in the profile itself to qualify such a Jet as the Citation for higher altitude stable...
Forum: Tech Log
17th Dec 2017, 13:17
Replies: 39
Views: 14,691
Posted By Sokol

DU is dangerous because of its Radiation. The so...

DU is dangerous because of its Radiation. The so called Alpha Radiation does not Penetrate very well and it has not a significant reach, you can cut off Alpha Rays with a simple piece of Paper....
Forum: Tech Log
7th Apr 2016, 17:22
Replies: 2
Views: 1,127
Posted By Sokol

Less than two weeks to go. Anyone else? ...

Less than two weeks to go. Anyone else?

Greetings,
Forum: Tech Log
19th Mar 2016, 17:22
Replies: 2
Views: 1,127
Posted By Sokol

Anyone on AERO exhibition in April?

Hi,

I was asking myself who else is on the April AERO exhibition in Friedrichshafen,Germany?

Greetings,
Forum: Rotorheads
7th Mar 2016, 09:13
Replies: 77
Views: 10,470
Posted By Sokol

Well, triggerspeed should have a high variation....

Well, triggerspeed should have a high variation. (Mostly be higher as predicted) As I said: that is more a problem in reynolds numbers.

In the VRS itself the behavior should be nearly the same as...
Forum: Rotorheads
4th Mar 2016, 08:18
Replies: 77
Views: 10,470
Posted By Sokol

Well, Reynolds numbers are for laminar incoming...

Well, Reynolds numbers are for laminar incoming flow. Which you can´t expect fully on an rotorhead. (Prandtl)

for shure it is :ok:

Engines: Environment only happens on Intake and exhaust....
Forum: Rotorheads
3rd Mar 2016, 20:42
Replies: 77
Views: 10,470
Posted By Sokol

Well, thanks fo that advice. As my mayor is in...

Well, thanks fo that advice. As my mayor is in turbofan engines I could´nt think of reading about it.

However: Thanks for literature recommendation.

The problem occurs simply in scale....
...
Forum: Rotorheads
2nd Mar 2016, 10:07
Replies: 77
Views: 10,470
Posted By Sokol

That´s true. I am no pilot, does´nt that allow me...

That´s true. I am no pilot, does´nt that allow me to ask pilots about thier expierience? I am shure that is one of the main problems in the aviationworld.

(e.g. understanding that and why an...
Forum: Rotorheads
29th Feb 2016, 21:45
Replies: 77
Views: 10,470
Posted By Sokol

If you descend with the Heavy and Light helo at...

If you descend with the Heavy and Light helo at the same speed, pitching up both the same manner you get exactly the same initial downwash speed on both helos (refered to the helicopters)

The...
Forum: Rotorheads
26th Feb 2016, 10:56
Replies: 77
Views: 10,470
Posted By Sokol

Sorry, I have´nt specified my question enough. ...

Sorry, I have´nt specified my question enough.

I meant the initial downwash(when you start pitching up), both Helicopters are in the same pitch, refered to the helicopter and not to the...
Forum: Rotorheads
25th Feb 2016, 18:30
Replies: 77
Views: 10,470
Posted By Sokol

So you are saying that the lighter helo would´nt...

So you are saying that the lighter helo would´nt have a downwash speed as high as the heavy helo?
(You can refer this question right to the which helo decelerates faster question)

We are up to...
Forum: Rotorheads
24th Feb 2016, 10:15
Replies: 77
Views: 10,470
Posted By Sokol

You are a very patient man. Speaking...

You are a very patient man.



Speaking of power: The power you need depends on the forces on the Helo as you said. Mechanical force is mass multiplied by acceleration. Following this law and...
Forum: Rotorheads
23rd Feb 2016, 21:19
Replies: 77
Views: 10,470
Posted By Sokol

We´ll get onto that later, another question: ...

We´ll get onto that later, another question:

Which helo (full or empty) decelerates faster in descent?

Greetings,
Forum: Rotorheads
23rd Feb 2016, 12:06
Replies: 77
Views: 10,470
Posted By Sokol

That sometimes materials (or more precisely:...

That sometimes materials (or more precisely: thier usage) are the reason too. So you are right.

Note: The question was originally why the helicopters in the document get into VR this early. I...
Forum: Rotorheads
23rd Feb 2016, 10:47
Replies: 77
Views: 10,470
Posted By Sokol

Lower stiffness of the Blades, higher tendency to...

Lower stiffness of the Blades, higher tendency to twist.



There is a difference between high mass flow and high velocity, read about it.
Plus: Composite(plastics) blades have a tendency to...
Forum: Rotorheads
22nd Feb 2016, 23:43
Replies: 77
Views: 10,470
Posted By Sokol

This is not the Reason. The reason is to be...

This is not the Reason.

The reason is to be found in the shape of the early blades, of whom are designed to distribute the same lift(by massflow) on each diameter.
As you can see in the document...
Forum: Rotorheads
21st Feb 2016, 17:07
Replies: 77
Views: 10,470
Posted By Sokol

Aeroelastics. You get into VRA because the...

Aeroelastics.

You get into VRA because the main Rotor blades pump too much air for the environment.(Same thing happens when you heat up oil and those little bosses occur - another story)
This...
Forum: Tech Log
16th Feb 2016, 12:51
Replies: 75
Views: 14,324
Posted By Sokol

Then crash course in german engineering 101: ...

Then crash course in german engineering 101:

When you discuss an idea, it is not the person under criticism, it is the idea.
If you get a tip about an limitation you have to change it, or set an...
Forum: Tech Log
15th Feb 2016, 22:18
Replies: 75
Views: 14,324
Posted By Sokol

Do you have any clue how that plus the long...

Do you have any clue how that plus the long distance between the wings would influence the structural analysis?

Even though: An aircraft is not an flying house, there is a reason that the...
Forum: Tech Log
12th Feb 2016, 11:47
Replies: 17
Views: 2,523
Posted By Sokol

MathFox: Thats what i am trying to explain. Good...

MathFox: Thats what i am trying to explain. Good point.

Greetings,
Forum: Tech Log
12th Feb 2016, 11:33
Replies: 17
Views: 2,523
Posted By Sokol

I didn´t say it does. SURGE bleed open. ...

I didn´t say it does.

SURGE bleed open.

Your word "hunting" describes the matter the best.

I don´t get that point.

Study it for 3 Years and then try to explain this topic without using...
Forum: Tech Log
12th Feb 2016, 10:23
Replies: 17
Views: 2,523
Posted By Sokol

I meant it as complete, please. You´re starting...

I meant it as complete, please. You´re starting the engines with bleed air, bleed air is for getting the compressor of one (mostly the high pressure) stage out of pumping(TURIN: Hunting) into an...
Forum: Tech Log
11th Feb 2016, 17:35
Replies: 17
Views: 2,523
Posted By Sokol

No. It is the bypass ratio an the layout of the...

No. It is the bypass ratio an the layout of the spools that makes the difference.



The correct phrase is "Pumping".

Greetings,
Forum: Tech Log
11th Feb 2016, 11:01
Replies: 75
Views: 14,324
Posted By Sokol

It is completely anyhow how you do the pitch up...

It is completely anyhow how you do the pitch up in this configuration. It does result in a higher lift in the front wing, so the neutral point moves forward.



Thats true. Mainly on Transport...
Forum: Tech Log
10th Feb 2016, 17:33
Replies: 75
Views: 14,324
Posted By Sokol

I got that Idea. But the center of lift has to...

I got that Idea. But the center of lift has to move forward on landing since your rear wing is used as elevator.



Thats clear. Like i said, an forward swept wing brings in Aeroelastic problems,...
Showing results 1 to 25 of 40
 


 
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