Jump to content

Notice: Effective July 1, 2024, Vertical Forums will be officially shut down. As a result, all forum activity will be permanently removed. We understand that this news may come as a disappointment, but we would like to thank everyone for being a part of our community for so many years.

If you are interested in taking over this Forum, please contact us prior to July 1.

NOTARs


Guest sharky
 Share

Recommended Posts

Hey Teach, how are things?

 

I had a chance to see the Sikorsky ABC (Advanced Blade Concept) in the early eighties (or late seventies????). The idea behind the stubbies providing lift at high speed is requiring less rotor pitch for the lift vector, and with small turbofans for propulsion, you didn''t need much pitch for the "go fast" vector, so there was much less exposure to blade stall. Much like the Piasecki design. I think they were hitting nearly 300 knots, if not more. It was a coaxial design, one shaft through the other, with either blade cancelling out the negative tendacies of the other at high speed. I''m not sure what happened to it, but I thought it had a future. Sure looked cool.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share

×
×
  • Create New...