fisher@wsgate.DEC (07/15/85)
<>
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.ARPAdollas@uiucdcsb.Uiuc.ARPA (07/16/85)
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.arpaking@dciem.UUCP (Stephen King) (07/18/85)
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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.freeman@spar.UUCP (Jay Freeman) (07/21/85)
[] 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)
dma@ssc-vax.UUCP (Dennis Anderson) (07/22/85)
> > 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
bl@hplabsb.UUCP (07/25/85)
> > 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.