Zero-G

[Winnie]

The original question was in the line of how do other helicopters "fully articulated and rigid in plane" fare in low or negative G situations?

The answer is this: Since these helicopters have offset flapping hinges, or no hinges at all, they will not allow you to get into mast bumping, however, you stand a great chance of getting Droop-stop Pounding, which I'm sure is not too good either! The AH-64 Apache helicopter is actually capable of -1G, but other than in an extreme push-over or bunt would it be possible to achieve that, since if it rolled inverted all the way, it would start falling (no negative pitch). Your instructor probably showed you a low-g situation, and how to recover, and the biggest concern seems to be that in a violent pushover, the tail will roll you to the right violently, and a natural reaction is to roll cyclic to the left to arrest. This has no effect on an unloaded semirigid disk, but because of the offset flapping hinges, there will be a bending moment on the hub in fully articulated machines, and this will induce some roll. In Norway (My country of permanent residence) the military actually had problems of mast bumping in their Bell 412SP's, which theoretically seemed impossible, since they are four bladed, but the system is aparently a double two bladed 'soft in plane' similar to the 222/230, and thus capable of achieving mast bumping.
Speaking of inverted flight, the British army air corps rolled and looped their Lynx helicopters, and Sikorsky barrel rolled their S-65 Super Stallion (Ch-53E).

Hope nobody got bored, and that somebody actually reads what I've written!!


Edited typos only, so the typo police wouldn't catch on!

 

[Winnie]

The original question was in the line of how do other helicopters "fully articulated and rigid in plane" fare in low or negative G situations?

The answer is this: Since these helicopters have offset flapping hinges, or no hinges at all, they will not allow you to get into mast bumping, however, you stand a great chance of getting Droop-stop Pounding, which I'm sure is not too good either! The AH-64 Apache helicopter is actually capable of -1G, but other than in an extreme push-over or bunt would it be possible to achieve that, since if it rolled inverted all the way, it would start falling (no negative pitch). Your instructor probably showed you a low-g situation, and how to recover, and the biggest concern seems to be that in a violent pushover, the tail will roll you to the right violently, and a natural reaction is to roll cyclic to the left to arrest. This has no effect on an unloaded semirigid disk, but because of the offset flapping hinges, there will be a bending moment on the hub in fully articulated machines, and this will induce some roll. In Norway (My country of permanent residence) the military actually had problems of mast bumping in their Bell 412SP's, which theoretically seemed impossible, since they are four bladed, but the system is aparently a double two bladed 'soft in plane' similar to the 222/230, and thus capable of achieving mast bumping.
Speaking of inverted flight, the British army air corps rolled and looped their Lynx helicopters, and Sikorsky barrel rolled their S-65 Super Stallion (Ch-53E).

Hope nobody got bored, and that somebody actually reads what I've written!!


Edited typos only, so the typo police wouldn't catch on!

 

[Winnie]

The original question was in the line of how do other helicopters "fully articulated and rigid in plane" fare in low or negative G situations?

The answer is this: Since these helicopters have offset flapping hinges, or no hinges at all, they will not allow you to get into mast bumping, however, you stand a great chance of getting Droop-stop Pounding, which I'm sure is not too good either! The AH-64 Apache helicopter is actually capable of -1G, but other than in an extreme push-over or bunt would it be possible to achieve that, since if it rolled inverted all the way, it would start falling (no negative pitch). Your instructor probably showed you a low-g situation, and how to recover, and the biggest concern seems to be that in a violent pushover, the tail will roll you to the right violently, and a natural reaction is to roll cyclic to the left to arrest. This has no effect on an unloaded semirigid disk, but because of the offset flapping hinges, there will be a bending moment on the hub in fully articulated machines, and this will induce some roll. In Norway (My country of permanent residence) the military actually had problems of mast bumping in their Bell 412SP's, which theoretically seemed impossible, since they are four bladed, but the system is aparently a double two bladed 'soft in plane' similar to the 222/230, and thus capable of achieving mast bumping.
Speaking of inverted flight, the British army air corps rolled and looped their Lynx helicopters, and Sikorsky barrel rolled their S-65 Super Stallion (Ch-53E).

Hope nobody got bored, and that somebody actually reads what I've written!!


Edited typos only, so the typo police wouldn't catch on!

 

[Winnie]

The original question was in the line of how do other helicopters "fully articulated and rigid in plane" fare in low or negative G situations?

The answer is this: Since these helicopters have offset flapping hinges, or no hinges at all, they will not allow you to get into mast bumping, however, you stand a great chance of getting Droop-stop Pounding, which I'm sure is not too good either! The AH-64 Apache helicopter is actually capable of -1G, but other than in an extreme push-over or bunt would it be possible to achieve that, since if it rolled inverted all the way, it would start falling (no negative pitch). Your instructor probably showed you a low-g situation, and how to recover, and the biggest concern seems to be that in a violent pushover, the tail will roll you to the right violently, and a natural reaction is to roll cyclic to the left to arrest. This has no effect on an unloaded semirigid disk, but because of the offset flapping hinges, there will be a bending moment on the hub in fully articulated machines, and this will induce some roll. In Norway (My country of permanent residence) the military actually had problems of mast bumping in their Bell 412SP's, which theoretically seemed impossible, since they are four bladed, but the system is aparently a double two bladed 'soft in plane' similar to the 222/230, and thus capable of achieving mast bumping.
Speaking of inverted flight, the British army air corps rolled and looped their Lynx helicopters, and Sikorsky barrel rolled their S-65 Super Stallion (Ch-53E).

Hope nobody got bored, and that somebody actually reads what I've written!!


Edited typos only, so the typo police wouldn't catch on!

 

[Winnie]

The original question was in the line of how do other helicopters "fully articulated and rigid in plane" fare in low or negative G situations?

The answer is this: Since these helicopters have offset flapping hinges, or no hinges at all, they will not allow you to get into mast bumping, however, you stand a great chance of getting Droop-stop Pounding, which I'm sure is not too good either! The AH-64 Apache helicopter is actually capable of -1G, but other than in an extreme push-over or bunt would it be possible to achieve that, since if it rolled inverted all the way, it would start falling (no negative pitch). Your instructor probably showed you a low-g situation, and how to recover, and the biggest concern seems to be that in a violent pushover, the tail will roll you to the right violently, and a natural reaction is to roll cyclic to the left to arrest. This has no effect on an unloaded semirigid disk, but because of the offset flapping hinges, there will be a bending moment on the hub in fully articulated machines, and this will induce some roll. In Norway (My country of permanent residence) the military actually had problems of mast bumping in their Bell 412SP's, which theoretically seemed impossible, since they are four bladed, but the system is aparently a double two bladed 'soft in plane' similar to the 222/230, and thus capable of achieving mast bumping.
Speaking of inverted flight, the British army air corps rolled and looped their Lynx helicopters, and Sikorsky barrel rolled their S-65 Super Stallion (Ch-53E).

Hope nobody got bored, and that somebody actually reads what I've written!!


Edited typos only, so the typo police wouldn't catch on!

 

[Winnie]

The original question was in the line of how do other helicopters "fully articulated and rigid in plane" fare in low or negative G situations?

The answer is this: Since these helicopters have offset flapping hinges, or no hinges at all, they will not allow you to get into mast bumping, however, you stand a great chance of getting Droop-stop Pounding, which I'm sure is not too good either! The AH-64 Apache helicopter is actually capable of -1G, but other than in an extreme push-over or bunt would it be possible to achieve that, since if it rolled inverted all the way, it would start falling (no negative pitch). Your instructor probably showed you a low-g situation, and how to recover, and the biggest concern seems to be that in a violent pushover, the tail will roll you to the right violently, and a natural reaction is to roll cyclic to the left to arrest. This has no effect on an unloaded semirigid disk, but because of the offset flapping hinges, there will be a bending moment on the hub in fully articulated machines, and this will induce some roll. In Norway (My country of permanent residence) the military actually had problems of mast bumping in their Bell 412SP's, which theoretically seemed impossible, since they are four bladed, but the system is aparently a double two bladed 'soft in plane' similar to the 222/230, and thus capable of achieving mast bumping.
Speaking of inverted flight, the British army air corps rolled and looped their Lynx helicopters, and Sikorsky barrel rolled their S-65 Super Stallion (Ch-53E).

Hope nobody got bored, and that somebody actually reads what I've written!!


Edited typos only, so the typo police wouldn't catch on!

 

[Winnie]

The original question was in the line of how do other helicopters "fully articulated and rigid in plane" fare in low or negative G situations?

The answer is this: Since these helicopters have offset flapping hinges, or no hinges at all, they will not allow you to get into mast bumping, however, you stand a great chance of getting Droop-stop Pounding, which I'm sure is not too good either! The AH-64 Apache helicopter is actually capable of -1G, but other than in an extreme push-over or bunt would it be possible to achieve that, since if it rolled inverted all the way, it would start falling (no negative pitch). Your instructor probably showed you a low-g situation, and how to recover, and the biggest concern seems to be that in a violent pushover, the tail will roll you to the right violently, and a natural reaction is to roll cyclic to the left to arrest. This has no effect on an unloaded semirigid disk, but because of the offset flapping hinges, there will be a bending moment on the hub in fully articulated machines, and this will induce some roll. In Norway (My country of permanent residence) the military actually had problems of mast bumping in their Bell 412SP's, which theoretically seemed impossible, since they are four bladed, but the system is aparently a double two bladed 'soft in plane' similar to the 222/230, and thus capable of achieving mast bumping.
Speaking of inverted flight, the British army air corps rolled and looped their Lynx helicopters, and Sikorsky barrel rolled their S-65 Super Stallion (Ch-53E).

Hope nobody got bored, and that somebody actually reads what I've written!!


Edited typos only, so the typo police wouldn't catch on!

 

[Winnie]

The original question was in the line of how do other helicopters "fully articulated and rigid in plane" fare in low or negative G situations?

The answer is this: Since these helicopters have offset flapping hinges, or no hinges at all, they will not allow you to get into mast bumping, however, you stand a great chance of getting Droop-stop Pounding, which I'm sure is not too good either! The AH-64 Apache helicopter is actually capable of -1G, but other than in an extreme push-over or bunt would it be possible to achieve that, since if it rolled inverted all the way, it would start falling (no negative pitch). Your instructor probably showed you a low-g situation, and how to recover, and the biggest concern seems to be that in a violent pushover, the tail will roll you to the right violently, and a natural reaction is to roll cyclic to the left to arrest. This has no effect on an unloaded semirigid disk, but because of the offset flapping hinges, there will be a bending moment on the hub in fully articulated machines, and this will induce some roll. In Norway (My country of permanent residence) the military actually had problems of mast bumping in their Bell 412SP's, which theoretically seemed impossible, since they are four bladed, but the system is aparently a double two bladed 'soft in plane' similar to the 222/230, and thus capable of achieving mast bumping.
Speaking of inverted flight, the British army air corps rolled and looped their Lynx helicopters, and Sikorsky barrel rolled their S-65 Super Stallion (Ch-53E).

Hope nobody got bored, and that somebody actually reads what I've written!!


Edited typos only, so the typo police wouldn't catch on!

 

[Winnie]

The original question was in the line of how do other helicopters "fully articulated and rigid in plane" fare in low or negative G situations?

The answer is this: Since these helicopters have offset flapping hinges, or no hinges at all, they will not allow you to get into mast bumping, however, you stand a great chance of getting Droop-stop Pounding, which I'm sure is not too good either! The AH-64 Apache helicopter is actually capable of -1G, but other than in an extreme push-over or bunt would it be possible to achieve that, since if it rolled inverted all the way, it would start falling (no negative pitch). Your instructor probably showed you a low-g situation, and how to recover, and the biggest concern seems to be that in a violent pushover, the tail will roll you to the right violently, and a natural reaction is to roll cyclic to the left to arrest. This has no effect on an unloaded semirigid disk, but because of the offset flapping hinges, there will be a bending moment on the hub in fully articulated machines, and this will induce some roll. In Norway (My country of permanent residence) the military actually had problems of mast bumping in their Bell 412SP's, which theoretically seemed impossible, since they are four bladed, but the system is aparently a double two bladed 'soft in plane' similar to the 222/230, and thus capable of achieving mast bumping.
Speaking of inverted flight, the British army air corps rolled and looped their Lynx helicopters, and Sikorsky barrel rolled their S-65 Super Stallion (Ch-53E).

Hope nobody got bored, and that somebody actually reads what I've written!!


Edited typos only, so the typo police wouldn't catch on!

 

[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.

 

[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.