Stopped Rotor idea

[Dave_Jackson]

slowrotor.

Here are some rambling thoughts, for what they're worth.
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Re your old, and missed , Stopped Rotor posting of Dec 16, 2006.
For the interested here is a picture and paragraph on Ellehammer's helicopter from page 8 of Leishman's book. One or two others have promoted this idea since then. This is a video of Vranek's concept. The use of the relatively unproductive center portion of a rotor disk as a 'wing' or 'lifting body' is interesting. However, in forward flight the rotor-disk would have to be tilted forward and the 'wing' must be tilted back. Incidentally, Nick was not impressed with the Disk Rotor.

Here is a later PPRuNe thread on this concept.
Here is a related patent, which I just stumbled upon.
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Re the Airs/Boeing craft.

It is interesting. However it also seem to be very 'busy' with 5 rotors & propellers, plus 2 pair of wings. How easy it is to be critical

You might, and then you might not, find something in this idea. It has been the current project for the past couple of days and it is an attempt to simplify the AeroVantage

Some noteworthyless points.

• The wings, or at least the root ends of the wings will rotate with the PropRotors.
• The large rotor might be stopped once the transition to forward flight has been made and used as a partial wing (canard?), since the single propeller can provide all the necessary forward thrust.
• A gas engine might rotate with the Propeller(s). The center of lift of the wing would therefore be further ahead of the center of lift of the hovering rotors.
• The torque of the two rotors might be reasonably well balanced, with the ailerons on the wings compensating for any difference during hover.
• Enough rambling for now.

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Re posting #
Here is Cierva's Patent application, c/w the drawings. It appears that he did not continue and file a full US patent.

This is the Carter concept and it doesn't do anything for me.


Dave