Article-I.D.: <3115@decwrl.UUCP>
Date: Mon, 15-Jul-85 13:27:56 EDT
Article-I.D.: decwrl.3115
Posted: Mon Jul 15 13:27:56 1985
Date-Received: Wed, 17-Jul-85 06:41:41 EDT
Sender: daemon@decwrl.UUCP
Organization: DEC Engineering Network
Lines: 11

<>
Someone asked for an example of angular momentum cancellation.  Isn't there
a helicopter which has two counterrotating, coaxial blades, rather than
a tail rotor?  (Perhaps it was a Popular Science "Coming next year" article
that talked about it, rather than something real).

Burns

	UUCP:	... {decvax|allegra|ucbvax}!decwrl!rhea!dvinci!fisher

	ARPA:	fisher%dvinci.dec@decwrl.ARPA

Article-I.D.: <15700023@uiucdcsb>
Date: Tue, 16-Jul-85 09:48:00 EDT
Article-I.D.: uiucdcsb.15700023
Posted: Tue Jul 16 09:48:00 1985
Date-Received: Thu, 18-Jul-85 05:31:10 EDT
References: <3115@decwrl.UUCP>
Lines: 9
Nf-ID: #R:decwrl.UUCP:-311500:uiucdcsb:15700023:000:314
Nf-From: uiucdcsb.Uiuc.ARPA!dollas    Jul 16 08:48:00 1985


There is a Soviet helicopter. Its NATO designation is HORMONE (don't ask
me why) which has two counter-rotating sets of blades and no tail rotor.

I do not know of any american helicopters that use this principle.

Apostolos Dollas
        USENET:	...!{pur-ee,ihnp4}!uiucdcs!dollas 
        ARPA:	dollas@uiuc.arpa

Article-I.D.: <1640@dciem.UUCP>
Date: Thu, 18-Jul-85 09:23:14 EDT
Article-I.D.: dciem.1640
Posted: Thu Jul 18 09:23:14 1985
Date-Received: Thu, 18-Jul-85 11:50:28 EDT
References: 
Reply-To: king@dciem.UUCP (Stephen )
Organization: D.C.I.E.M., Toronto, Canada
Lines: 7
Summary: 

-=-=-=-=-=-=-=-=
I believe that the Soviet helicopter 'Hind' uses two counter-rotating
sets of blades mounted coaxially, but, unless I'm mistaken, it also has
a tail rotor for controlling yaw. Unlike film spools, however, the
helicopter blades will not change in mass as the turn.
                -=-=-= sjk.

Article-I.D.: spar.411
Posted: Sat Jul 20 20:53:05 1985
Date-Received: Sun, 21-Jul-85 23:44:55 EDT
References: <3115@decwrl.UUCP> <15700023@uiucdcsb>
Reply-To: freeman@max.UUCP (Jay Freeman)
Organization: Schlumberger Palo Alto Research, CA
Lines: 14
Summary: 

[]

In article <15700023@uiucdcsb> dollas@uiucdcsb.Uiuc.ARPA writes:
>
>There is a Soviet helicopter. Its NATO designation is HORMONE (don't ask
>me why) which has two counter-rotating sets of blades and no tail rotor.
>
>I do not know of any american helicopters that use this principle.

An American manufacturer -- I think it was Kaman -- used to make some
helicopters that used contrarotating blades that meshed like the blades of
an eggbeater.  The Navy bought some of them.

-- 
Jay Reynolds Freeman (Schlumberger Palo Alto Research)(canonical disclaimer)

Article-I.D.: ssc-vax.57
Posted: Mon Jul 22 10:15:01 1985
Date-Received: Thu, 25-Jul-85 20:02:26 EDT
References: <3115@decwrl.UUCP> <15700023@uiucdcsb>
Organization: Boeing Aerospace Co., Seattle, WA
Lines: 14

> 
> There is a Soviet helicopter. Its NATO designation is HORMONE (don't ask
> me why) which has two counter-rotating sets of blades and no tail rotor.
> 
> I do not know of any american helicopters that use this principle.
> 
> Apostolos Dollas
>         USENET:	...!{pur-ee,ihnp4}!uiucdcs!dollas 
>         ARPA:	dollas@uiuc.arpa

The Boeing/Vertol CH-47 also has counter-rotating rotors, and no tail rotor.


				Dennis Anderson @ Boeing Aerospace

Article-I.D.: hplabsb.3017
Posted: Wed Jul 24 19:58:38 1985
Date-Received: Fri, 26-Jul-85 23:55:41 EDT
References: <3115@decwrl.UUCP> <15700023@uiucdcsb>
Organization: Hewlett Packard Labs, Palo Alto CA
Lines: 15

> 
> There is a Soviet helicopter. Its NATO designation is HORMONE (don't ask
> me why) which has two counter-rotating sets of blades and no tail rotor.
> 
> I do not know of any american helicopters that use this principle.
> 
> Apostolos Dollas
>         USENET:	...!{pur-ee,ihnp4}!uiucdcs!dollas 
>         ARPA:	dollas@uiuc.arpa

There was an article in "Sport Aviation" a couple of month ago about
a fellow (American) who built his own helicopter with counter-rotating
blades (and, of course, no tail rotor).  The rotors are on seperate
shafts that formed a narrow V.  The rotors (two blades each) inter-mesh as
they rotate.