during operation of the walk behind trowel dynamically balancing the trowel requires that as many forces acting on the handle as possible be eliminated referring first to fig5 a which is a force diagram in the horizontal xy plane the lines 70 designate the blades it being assumed that each blade has the same effective length u201c a u201d as measured from the rotor rotational axis a to the centroid of the forces acting on the trowel blade the line 72 designates the handle in the lateral x plane and has effective lengths u201c e u201d on either side of the center post 44 fig1 3 i e the guide handle and has a lateral length of 2e the handle 12 has an effective longitudinal length u201c b u201d as measured from the rotational axis a of the rotor to the grips on the guide handle as schematically represented by the line 74 in operation the four blades are subjected to friction generated horizontal forces f af f bf f cf and f df respectively which result in corresponding moment arms af af af bf af cf and af df about the rotor axis a the handle 12 is subjected to longitudinal y horizontal forces f h2 and f h3 and a lateral x force f h1 the forces acting on the handle in the x direction can balanced or set to zero using the equation the forces acting on the handle in the y direction can balanced or set to zero using the equation the moment in the xy plane can be balanced or set to zero using the equation a.