[modeleng] Help on Solenoids

Gentlemen,
 
I have in mind a project involving the construction of a novelty electric  
engine.
This will naturally include solenoids, I am looking for help on the  design 
of these items.
As I see it I need to start with the power source, say two AA batteries,  
that's the amount of space I have allocated. Assuming (for reasonable  
battery life) I choose a current of 100mA, from ohms law I know the resistance  
of 
the wire. From this I can calculate the length of enamelled wire to wind my 
 coil with. As I have designed the size of the coil bobbin, can anyone 
direct me  to a formula from which I can predetermine the optimum number of 
turns and  hence establish the ampere turns?
In fact 'when push comes to shove' I will probably try and get the maximum  
number of turns on the bobbin and hope that the resultant force will be 
enough  to drive my project.
 
Thanks, by the, way where is everybody?
 
Ken Jones in very wet Berkshire.

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