Originally Posted by jwalker
Draw a diagram to explain to me where in a waterjet the forces are being applied.
Jeff, do you think the force being applied is the mechanical one of the impellor/stator? If that's what's accelerating the water (mass) out the back & through the smaller opening then that must be causing the initial action
(like pulling the trigger or snapping an elastic band.) (Thus the action/reaction Newton bit).
DJL found your explanation about operation of the jet in air (as distinct from water) clear & helpful.
Where is the force against which there is the reaction? Where is the propulsive reactive force applied, to the blades of the impeller and thence through a thrust bearing and on into the structure of the boat? To the inside of the casing?
Oh OK I think I get it. You want the exact mechanics of where the impellor acts and where the energy transfer actually happens ? Down to the nuts and bolts ?
This link posted by gArf is pretty helpful but I haven't checked it all to see whether it is demonstarting the specific mechanics of the thing.
Hamiltons here (again)http://www.hamjet.co.nz/index.cfm/Th...jet_Works.html
(Next build project? Pete 7 seems to be working on a Fareham version in the back garden so perhaps he will keep us posted
BTW thanks again for all helpful contributions