Zero-G

[CTD]

Excuse me? The Norwegian military has certainly never experienced ''mast bumping'' with any of their 412s. A testiment to this fact is that they still have all the machines they bought, which would not be the case follwing a mast bumping incident.

What has occurred in the past have been cases of incorrect rigging, resulting in the swashplate impinging on the mast and grooving it.

Also, the stacked soft-in-plane rotors of the 412 and 430 have no similarity whatsoever to the 222/230, which are teetering semirigid systems, like the 206. The former behaves more like a fully articulated, but use flexing in the hub instead of hinges.

 

[CTD]

Excuse me? The Norwegian military has certainly never experienced ''mast bumping'' with any of their 412s. A testiment to this fact is that they still have all the machines they bought, which would not be the case follwing a mast bumping incident.

What has occurred in the past have been cases of incorrect rigging, resulting in the swashplate impinging on the mast and grooving it.

Also, the stacked soft-in-plane rotors of the 412 and 430 have no similarity whatsoever to the 222/230, which are teetering semirigid systems, like the 206. The former behaves more like a fully articulated, but use flexing in the hub instead of hinges.

 

[CTD]

Excuse me? The Norwegian military has certainly never experienced ''mast bumping'' with any of their 412s. A testiment to this fact is that they still have all the machines they bought, which would not be the case follwing a mast bumping incident.

What has occurred in the past have been cases of incorrect rigging, resulting in the swashplate impinging on the mast and grooving it.

Also, the stacked soft-in-plane rotors of the 412 and 430 have no similarity whatsoever to the 222/230, which are teetering semirigid systems, like the 206. The former behaves more like a fully articulated, but use flexing in the hub instead of hinges.

 

[Winnie]

CTD:
I stand corrected!
I should question my references better for sure!
What happened was that the Royal Norwegian Air Force "thought" they had mast bumping on their 412SP's, and consequently they were limited for maximum 30 degrees nose up/nose down. But I fear that they, as I was wrong in our conclusions, and I believe that you are right and I am wrong.

I realize now what I wrote! Had something else entered here, but just as I signed off it came to me, the AH-1 Cobra has something of a soft in plane, but then again it looks to act like a semirigid in action, somewhat similar to the head of the 214B's? Not sure anymore, and now I will shut up !

At least you read the post!

 

[Winnie]

CTD:
I stand corrected!
I should question my references better for sure!
What happened was that the Royal Norwegian Air Force "thought" they had mast bumping on their 412SP's, and consequently they were limited for maximum 30 degrees nose up/nose down. But I fear that they, as I was wrong in our conclusions, and I believe that you are right and I am wrong.

I realize now what I wrote! Had something else entered here, but just as I signed off it came to me, the AH-1 Cobra has something of a soft in plane, but then again it looks to act like a semirigid in action, somewhat similar to the head of the 214B's? Not sure anymore, and now I will shut up !

At least you read the post!

 

[Winnie]

CTD:
I stand corrected!
I should question my references better for sure!
What happened was that the Royal Norwegian Air Force "thought" they had mast bumping on their 412SP's, and consequently they were limited for maximum 30 degrees nose up/nose down. But I fear that they, as I was wrong in our conclusions, and I believe that you are right and I am wrong.

I realize now what I wrote! Had something else entered here, but just as I signed off it came to me, the AH-1 Cobra has something of a soft in plane, but then again it looks to act like a semirigid in action, somewhat similar to the head of the 214B's? Not sure anymore, and now I will shut up !

At least you read the post!

 

[Winnie]

CTD:
I stand corrected!
I should question my references better for sure!
What happened was that the Royal Norwegian Air Force "thought" they had mast bumping on their 412SP's, and consequently they were limited for maximum 30 degrees nose up/nose down. But I fear that they, as I was wrong in our conclusions, and I believe that you are right and I am wrong.

I realize now what I wrote! Had something else entered here, but just as I signed off it came to me, the AH-1 Cobra has something of a soft in plane, but then again it looks to act like a semirigid in action, somewhat similar to the head of the 214B's? Not sure anymore, and now I will shut up !

At least you read the post!

 

[Winnie]

CTD:
I stand corrected!
I should question my references better for sure!
What happened was that the Royal Norwegian Air Force "thought" they had mast bumping on their 412SP's, and consequently they were limited for maximum 30 degrees nose up/nose down. But I fear that they, as I was wrong in our conclusions, and I believe that you are right and I am wrong.

I realize now what I wrote! Had something else entered here, but just as I signed off it came to me, the AH-1 Cobra has something of a soft in plane, but then again it looks to act like a semirigid in action, somewhat similar to the head of the 214B's? Not sure anymore, and now I will shut up !

At least you read the post!

 

[Winnie]

CTD:
I stand corrected!
I should question my references better for sure!
What happened was that the Royal Norwegian Air Force "thought" they had mast bumping on their 412SP's, and consequently they were limited for maximum 30 degrees nose up/nose down. But I fear that they, as I was wrong in our conclusions, and I believe that you are right and I am wrong.

I realize now what I wrote! Had something else entered here, but just as I signed off it came to me, the AH-1 Cobra has something of a soft in plane, but then again it looks to act like a semirigid in action, somewhat similar to the head of the 214B's? Not sure anymore, and now I will shut up !

At least you read the post!

 

[Winnie]

CTD:
I stand corrected!
I should question my references better for sure!
What happened was that the Royal Norwegian Air Force "thought" they had mast bumping on their 412SP's, and consequently they were limited for maximum 30 degrees nose up/nose down. But I fear that they, as I was wrong in our conclusions, and I believe that you are right and I am wrong.

I realize now what I wrote! Had something else entered here, but just as I signed off it came to me, the AH-1 Cobra has something of a soft in plane, but then again it looks to act like a semirigid in action, somewhat similar to the head of the 214B's? Not sure anymore, and now I will shut up !

At least you read the post!

 

[Winnie]

CTD:
I stand corrected!
I should question my references better for sure!
What happened was that the Royal Norwegian Air Force "thought" they had mast bumping on their 412SP's, and consequently they were limited for maximum 30 degrees nose up/nose down. But I fear that they, as I was wrong in our conclusions, and I believe that you are right and I am wrong.

I realize now what I wrote! Had something else entered here, but just as I signed off it came to me, the AH-1 Cobra has something of a soft in plane, but then again it looks to act like a semirigid in action, somewhat similar to the head of the 214B's? Not sure anymore, and now I will shut up !

At least you read the post!

 

[Winnie]

CTD:
I stand corrected!
I should question my references better for sure!
What happened was that the Royal Norwegian Air Force "thought" they had mast bumping on their 412SP's, and consequently they were limited for maximum 30 degrees nose up/nose down. But I fear that they, as I was wrong in our conclusions, and I believe that you are right and I am wrong.

I realize now what I wrote! Had something else entered here, but just as I signed off it came to me, the AH-1 Cobra has something of a soft in plane, but then again it looks to act like a semirigid in action, somewhat similar to the head of the 214B's? Not sure anymore, and now I will shut up !

At least you read the post!

 

[sharky]

So Bell''s 4-bladed soft-in-plane rotor systems have more of a semi-rigid action? Would that be to say that the blades move equal and opposite in directional flight...not unlike a teetering system?

Magseal, how does EC''s 3-blade starflex behave? Is it a semi-rigid design as well? Does the starflex absorb the lead/lag or do the blades themselves hinge?

Is the flapping action of either of these systems absorbed by the elastomerics as well? Or do the blades hinge?

This is all wonderful information so far....and so for curiosity''s sake, could a rotor system say with bell''s soft-in-plane or EC''s starflex be able to tolerate 0 or negative g''s? What about sustained 0/neg g''s?

thanks again.

 

[sharky]

So Bell''s 4-bladed soft-in-plane rotor systems have more of a semi-rigid action? Would that be to say that the blades move equal and opposite in directional flight...not unlike a teetering system?

Magseal, how does EC''s 3-blade starflex behave? Is it a semi-rigid design as well? Does the starflex absorb the lead/lag or do the blades themselves hinge?

Is the flapping action of either of these systems absorbed by the elastomerics as well? Or do the blades hinge?

This is all wonderful information so far....and so for curiosity''s sake, could a rotor system say with bell''s soft-in-plane or EC''s starflex be able to tolerate 0 or negative g''s? What about sustained 0/neg g''s?

thanks again.

 

[sharky]

So Bell''s 4-bladed soft-in-plane rotor systems have more of a semi-rigid action? Would that be to say that the blades move equal and opposite in directional flight...not unlike a teetering system?

Magseal, how does EC''s 3-blade starflex behave? Is it a semi-rigid design as well? Does the starflex absorb the lead/lag or do the blades themselves hinge?

Is the flapping action of either of these systems absorbed by the elastomerics as well? Or do the blades hinge?

This is all wonderful information so far....and so for curiosity''s sake, could a rotor system say with bell''s soft-in-plane or EC''s starflex be able to tolerate 0 or negative g''s? What about sustained 0/neg g''s?

thanks again.