Re: Interesting high lights of the NAR BoD Meeting and ...

Alan Jones wrote: 
On 13 Aug 2005 14:57:35 -0500, kaplow_r@xxxxxxxxxxxxxxxxxxxxxx (Bob
Kaplow) wrote:


In article <1123906040.559755.305300@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>, "raydunakin@xxxxxxx" <raydunakin@xxxxxxx> writes:

flying weather wrote:

Ah, but that's the rub. Monocopters are not rockets per the nfpa.

Please provide a cite for this. 

I don't have my copies of NFPA 1122 / 1127 in front of me, but I believe the
definition of a model / HPR rocket includes "... not by generating lift from
aerodynamic surfaces". Monocopters don't fly on rocket thrust, they are
lifted by the aerodynamic surface spinning around.

As such, the don't fit the definition of a model rocket. 


True, but one might argue that it is a recoverable rocket motor
powered aeromodel, with "average" thrust in the direction of flight.

Rocket powered cars are not model rockets either.

So, where can I find plans for a monocopter scaled for and Estes E9?

Alan




Alan

Ed Miller's Alien Enterprises Monocopter 24 flies on Estes D11P or AT 24 mm motors, it retails around $25 and uses carbon fiber. Estes E9s also work but do in fact burn through the outside of the cardboard casing necissitating the business end of the motor sticking out past the motor tube so as not to burn through themotor tube. Email Ed for his catalog. Also Apogee has a book regarding the theory of monocopters which will help to understand their intricacies.

Monocopters, tricopter, bicopters, cooling fans which use horizontal rocket thrust provide their lift via aerodynamics. I've never seen a multi engine fan failure, my guess is there are issues concerning the out of balance machine soldiering on, but it's only a guess.

In the few monocopter failures I've seen the motor didn't end up very far from the rest of the wreckage as it just tumbled after rolling through the inside diameter of flight. The larger concern is the failure of the launch pin, which I've also seen, much like a rocket having launch lug failure at ignition, which is far more of a concern than the motor flying off. NO MONOCOPTER USING A G MOTOR AND HIGHER SHOULD BE LAUNCHED WITHOUT A STEEL LAUNCH PIN!! The video was posted some time ago.



As an aside, scale drag racing is now using rocket powered turbine motors, whereby the rocket boost turns a tubine blade which turns the wheels, and not using the motor thrust alone. How they control the cars is something I've not yet seen.

Chuck






.

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