Rotorheads A haven for helicopter professionals to discuss the things that affect them

Bell Nexus

Old 10th Jan 2019, 09:42
  #21 (permalink)  
 
Join Date: Jun 2016
Location: Brantisvogan
Posts: 429
Originally Posted by rrekn View Post
Speaking of mechanically complex, with a fixed pitched prop of that size, there will be no ability to autorotate.

Being essentially single engine, I wonder how they are going to argue there is sufficient redundancy for operations over built up areas? Ballistic Parachute?
It has a battery backup for extra takeoff power and for landing when the French turbine inevitably starts making metal
Bell_ringer is offline  
Old 10th Jan 2019, 18:30
  #22 (permalink)  
 
Join Date: Nov 2010
Location: Earth
Posts: 598
Originally Posted by rrekn View Post
Speaking of mechanically complex, with a fixed pitched prop of that size, there will be no ability to autorotate.
The real operating rotors don't appear to be fixed pitch

https://assets.bellflight.com/web/5b...0CF454E1F843CC

With a disc loading of about 19 that's approximately 10% lower than a V22.
SansAnhedral is offline  
Old 10th Jan 2019, 21:51
  #23 (permalink)  
 
Join Date: Mar 2005
Location: Poplar Grove, IL, USA
Age: 52
Posts: 831
Originally Posted by SansAnhedral View Post
The real operating rotors don't appear to be fixed pitch

https://assets.bellflight.com/web/5b...0CF454E1F843CC

With a disc loading of about 19 that's approximately 10% lower than a V22.
19 psf is pretty high. I bet the inertia is next to zilch. Variable pitch or not autorotation doesn't seem very viable.
IFMU is online now  
Old 10th Jan 2019, 22:51
  #24 (permalink)  
 
Join Date: May 2004
Location: Tax-land.
Posts: 853
Originally Posted by Ascend Charlie View Post
Looks like 6 times the normal amount of LTE from that one!
Drumroll! Winner!
tottigol is offline  
Old 11th Jan 2019, 00:51
  #25 (permalink)  
 
Join Date: May 2010
Location: PNW
Posts: 71
Originally Posted by IFMU View Post
19 psf is pretty high. I bet the inertia is next to zilch. Variable pitch or not autorotation doesn't seem very viable.
Right, I don't think autorotation in the conventional helicopter sense is in the design. The idea is 100% computer control that will sense if the engine dies and immediately shift to stored battery power, to maneuver around obstacles for a safe landing. Or if one of the fan motors dies, it will shift electric power to the others and keep everything balanced for a controlled landing. All of this in theory, of course.

And it will just take one of those "safe" landings on someone's house to kill the "taxi" concept in litigation. Even if the noise doesn't kill the concept first, and I think that's really the main obstacle because none of these things are actually in the air over people's houses yet.
Photonic is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.