Canda effect and conventional propeller effect in space station.

 Once I was considering Coanda effect in space station filled with air.

Conical weights inertial propulsion

 This inertial propulsion method was shown already on my blog. I am presenting it again because of my conviction of high potential of this propulsion method as a inertial drive system. Once the system is powered by electric motor and deck fuel-less source of electric energy it has potential to deep space exploration depending only from mechanical durability of parts from which the system is made. I didn't make any calculations about this method but the geometry of the device is indicating that the single weight is more massive than in eight-roller propulsion type, additionally having conical shape suitable for generate more thrust from one weight. The weak side of the device is application of ball bearings as power transmission elements on which is paid quite big pressure coming from the centrifugal force multiplied by weight of each mass, so they can be used down very quickly. The solution is application of strong permanent magnets both in external rim and on the tops of each conical mass. The friction will be canceled in such a situation, but the power of the device would be limited to the point where centrifugal force will be greater than magnetic repulsion force. Nevertheless, nowadays neodymium magnets are very strong magnets, so we can admit that the system will be producing sufficient force for lift loads and the crew. You can notice that this system has denser located masses on the bottom than on the top. If the system had the same density in every direction than no difference in centrifugal force distribution will be generated. Thanks the location side by side on the bottom the system can produce low centrifugal force in the vector complying with gravity vector, because the centers of the masses are passing closer from the main center of rotation almost attaching to central shaft from one smaller end aimed to the center. Main shaft is placed on bigger ball bearings and it is placed not centrally with relation to vertical diameter length of the device, slightly closer to the lowest point of the device. The weights/masses are made from two symmetric pieces in which there are made machining works like drilled holes for linear bearings and secondary shafts which are parts of the central rotor. Also drilled wholes for two screws and nuts conjoining in one piece both halves The system of caring the masses is made from eight smooth steel caring rollers.  The system in this shape can be not balanced enough due to it can have an ability to turning around caring steel rollers because they are round, however two applied ball bearings can stabilize each of the masses during the work. Of course there is a possibility to apply two caring rollers in each masses, so system would be stiffer. Also one could apply multi-spline shafts and multi-spline sleeves, working only on lubrication then only a pair of those parts will be required for sufficient caring of the weights. Application of multi-spline shafts and sleeves would prevent from the possibility to revolving on main axis of the working weights. However, centrifugal force will be trying to displace all lubrication to the circumference of the device thus there must be applied some kind of circulation of the lubrication to the inside of the device so it would be used again to prevent leaving the shafts and sleeves dry.  

Cuff's inertial propulsion system.

Cuff's inertial propulsion is an eight weights propulsion system and geometry is similar to my eight roller propulsion system which was presented already earlier on this blog with the difference generally based on the system of caring the weights on the internal edge of external rim.

Cuff has designed the eight ball bearings conjoined with eight weights by extending rods with sliding sleeves. I have solved the system slightly different where ball bearings were used on each side of the rollers and I have used the telescopic caring system for rollers.

From my calculations is implicating that system is really working producing useful force. My calculations were made with assumption of 500 rpm rotational speed and it is highly recommended to increase this speed so the result force can be stronger. My calculations didn't predict quantity of rollers and they were made for only two oppositely located rollers moving with different speed, what was implicated from the geometry of the device. In Cuff's device system is consisting of extending ball bearings. They have less mass that is located maximally outside the center of rotation, so result force should be weaker than in my concept, but generally system is much simpler and easier to made than my solution. On the picture I presented on top of this post I assume that application of linear bearings will be not possible so I apply the sliding sleeves and all will be working only on lubrication, because assumed system is so small. It should be suitable to fit to Proxxon MF-70 milling machine table KT-70. Presented here Cuff's system of propulsion is not only solution of that kind although only very few device was made in reality as a working prototype.