The paragraph 2.d. states that the "rotors are defined as surfaces that contibute lift by rotating on a common path around a vertical axis." The common path need not be a plane. For example, if the rotor blades had some "dihedral", the common path would be a cone. Such a blade arrangement is quite common in helicopters flown to the AMA rules.
Leo
Bloomington IN
--- In Indoor_Construction_at_yahoogroups.com, "Jeff" <janderson@...> wrote:
>
> Uhhh, what statement in the rules dictates rotors sharing a common axis? Not what I thought I wrote, nor the way I interpret it going back and re-reading.
>
> I think the relevant paragraph you are looking at is para 2.d. What we meant was that all the blades for a single rotor must be in a common plane, not that the axes for different rotors must be common. In other words, a Chinook style model helicopter should be fine (don't know about competitive though).
>
> If we butchered the lanquage so bad that one axis is a common interpretation by event supervisors, feel free to put in a clarification on the NSO site.
>
> Note, if folks feel this discussion is not appropriate to this forum, let me know and we'll take it off line.
>
> Jeff Anderson
> Livonia, MI
>
> --- In Indoor_Construction_at_yahoogroups.com, Bill Carney <wcarneyjx@> wrote:
> >
> > Neil,
> > Another thing, the rules practically dictate a ceiling walker design. Since
> > the rotors have to share an axis of rotation. About the only thing else you can
> > do is add another rotor or increase number or blades per rotor.
> >
> > Bill
> >
> >
> >
> >
> > ________________________________
> > From: Neil Dennis <wombatt_at_>
> > To: Indoor_Construction_at_yahoogroups.com
> > Sent: Mon, March 7, 2011 8:50:07 AM
> > Subject: [Indoor_Construction] SO heli's
> >
> >
> > Just wondering, isn't anyone building something other than "ceiling
> > walkers" ?
> >
> > The ones I've built or worked with all had the bottom rotor fixed to the
> > motor stick, but I think the "both rotating" is a better idea as you can
> > let them come up to speed before launch instead of just "tossing" and
> > hoping it starts going vertical.
> >
> > wombat
> >
>
Received on Mon Mar 07 2011 - 15:14:48 CET
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:46 CET