Chalkalis Gravity Wheel

[ae_vector]

Here's what I have so far. I just need to drill some holes. As you can see from the picture, it is 15 inches in radius (30 inch diameter). There are two 3.25 lbs weights (from an 8 lbs Nordictrack dumbbells) which are 6.8 inches from the axis. I plan to make the device adjustable from 24 inch to 30 inch diameter to test different scenarios. Surround the swing arms will be a 2x6 inch wooden frame approximately 3 feet wide by 3.5 feet tall with the axis of the swing arm in the middle of this frame. That way, I will have some safety protection should the weights dislodge from the swing arms. More pics to come.

-brian

[onthecuttingedge2005]

Person number 1. Hey! Lets invent a gravity wheel!
Person number 2, Hey, Lets go for Broke!

[knovos]

@ae_vector Thank you very much for your help with the weight calculations. This gives me more understanding about this device. Now there is no delay in the building. I have done a lot of replications with no really big results. With this device I will be more than happy if it works. The power output must be more then goes in to make this device self running. I will go from there to make adjustments for more output or to make a bigger device. Your design looks really great! I like that holes in the arms to make adjustments, great job so far.
Knovos

[w32]

Hello World,
I have studied this device enough to tell you that the external weight must be 10% of the summary that both main weights have together.
As well as that the driving system wheels (flywheels), must be 30% of the summary that the 2 main weights and the outer one have together.  (Without counting the blades or anything else from the system.)
By the way you should know that using smaller diameter on the driving system wheels, leads to less power consumption to drive the system. Without of course to alter the 30% ratio as mentioned before.  Also the elastics used on the flywheels should be soft and the elastics used as contact points on the top of the arc should be made from harder material.
Correct me if I’m wrong, but I understand your arm (blade) is of total 300mm and according to your plans looks like you are going to place the center of the main weights at 15 cm.
On Mr.Chalkalis’s prototype we have arm length 1120mm and the center of main weights is placed on 510mm,  while the rest 610mm of the metal blade, calculating from the center of each disk, work as a lever.
So, I think should you need to add more length to the lever part of your blades.
Dear Knovos, I would like to apologize for the comments I made on the wooden parts. I didn’t realize that the weight is actually placed 15 cm from the shaft. Guess you wouldn’t have any problems working with such small miniature.
Best regards
W32
(PS: Person number 3. Hey! Lets do nothing coz if we do they say we ‘ll go Broke!)

[knovos]

@ae_vector We have got support from W32 who has studied this device for a long time I understand. I thank you for your suggestions but I will go for the best info there is for this device to achieve the best results. I am a little confused now. I will make the device as much as possible editable like the possibility to change the main weights and moving its position.

@W32 Thank you for popping in here again and help me/us out to make the right decisions.
My outer weight is on this moment 1125 gram on a 300 mm outer diameter. So if the weight of this part must be 10% of the 2 both main weights together then I get: 1125 x 9 / 2 = 5062.5 gram for each main weight. While building the swing part, the outer diameter increased from 280 to 300mm because of the extra copper tube that I added. The position of the main weights with 300mm should be 13.7cm (45.54% from the shaft).

So, I think should you need to add more length to the lever part of your blades.

This confuses me. If you think I have to ad more length. There must be an exact formula calculating from the prototype for smaller devices. The remark ae_vector made for the scaling factor for weights versus the scaling factor for dimensions make sense to me. My original sizes where 1125gram outer 5710gram each main weight. You don't have to apologize for anything I appreciate you want to help. I need some more clearance about the right formula.
What do we need to know first:
1. The outer weight for a smaller diameter
OR
2. The 2 main weights for a smaller diameter
I don't want to think about output watts on this moment. I want to think first to make the device work with the right dimensions/weights.
Kind regards,
Knovos