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Forum: Rotorheads

19th Aug 2014, 14:39

Replies: 85

Sikorsky + Boeing pitch ‘X-2’-based design for US Army JMR TD effort

Views: 35,841

Posted By horlick97

Thanks for all the input regarding the...

Thanks for all the input regarding the limitations of the coaxial configuration when you scale it up.

The being the case, the only way to still employ the counter rotating rotors (so as to...

Forum: Rotorheads

16th Aug 2014, 12:30

Replies: 85

Sikorsky + Boeing pitch ‘X-2’-based design for US Army JMR TD effort

Views: 35,841

Posted By horlick97

Thanks KenV for the insightful discussion. ...

Thanks KenV for the insightful discussion.

May I enquire:
What is the factor that limits the X2 configuration to only upto FVL-M? Is it due to the difficulty in having rigid rotors beyond this...

Forum: Rotorheads

2nd Aug 2014, 15:04

Replies: 85

Sikorsky + Boeing pitch ‘X-2’-based design for US Army JMR TD effort

Views: 35,841

Posted By horlick97

It will one of each system. Coaxial:...

It will one of each system.

Coaxial: Either Boeing-Sikorsky or AVX.

Tiltrotor: Either Bell or Karem.

It will be good if award would allow the combination of the features to be...

Forum: Rotorheads

5th Jul 2014, 07:35

Replies: 85

Sikorsky + Boeing pitch ‘X-2’-based design for US Army JMR TD effort

Views: 35,841

Posted By horlick97

Does anyone know the status of the Groen Brothers...

Does anyone know the status of the Groen Brothers Gyrolifter concept? Would this not be a promising concept also? In fact, would the Fairley Rotordyne not have proven the concept?

Forum: Rotorheads

1st Jul 2014, 09:20

Replies: 85

Sikorsky + Boeing pitch ‘X-2’-based design for US Army JMR TD effort

Views: 35,841

Posted By horlick97

Thanks riff_raff. I learnt something new. ...

Thanks riff_raff. I learnt something new.

The ULOR is interesting, though I must acknowledge I do not understand fully by the 'offset'. Anyway, I wonder why boeing did not offer this or the JMR....

Forum: Rotorheads

28th Jun 2014, 15:07

Replies: 85

Sikorsky + Boeing pitch ‘X-2’-based design for US Army JMR TD effort

Views: 35,841

Posted By horlick97

Thanks Henra. It is interesting to learn...

Thanks Henra.

It is interesting to learn that the tandem's rotors need not be vertically separated due to the axis offset. Though I note this configuration would only be applicable within a very...

Forum: Rotorheads

21st Jun 2014, 08:23

Replies: 85

Sikorsky + Boeing pitch ‘X-2’-based design for US Army JMR TD effort

Views: 35,841

Posted By horlick97

Another question I have is what's the difference...

Another question I have is what's the difference between Defiant's forward thrust propellers and AVX's ducted fans?

Wouldn't AVX's split to two ducted fans require and additional...

Forum: Rotorheads

21st Jun 2014, 08:09

Replies: 85

Sikorsky + Boeing pitch ‘X-2’-based design for US Army JMR TD effort

Views: 35,841

Posted By horlick97

Please pardon my ignorance. May I seek some help...

Please pardon my ignorance. May I seek some help on the following:

What's the difference between X2's coaxial and AVX's coaxial?

I read that X2's rotors are rigid. Does that mean AVX's are...

Forum: Rotorheads

13th Jun 2014, 16:30

Replies: 85

Sikorsky + Boeing pitch ‘X-2’-based design for US Army JMR TD effort

Views: 35,841

Posted By horlick97

The largest helicopter in production by the...

The largest helicopter in production by the western world is the Sea Stallion. It employes the typical configuration of having a single main rotor with a tail rotor for counter torque.

The next...

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