set rocket(val){
		if( val )
			frame.step = frame.stepRocket;
		else
			frame.step = frame.stepExternal;
		isRocket = val;
	}
// forces applies from this are attached to the current frame
forces applies from this are attached to the current frame
forces applies from this are attached to the current frame
set rocket(val){
		if( val )
			frame.step = frame.stepRocket;
		else
			frame.step = frame.stepExternal;
		isRocket = val;
	}
set rocket ( val ) { if ( val ) frame . step = frame . stepRocket ; else frame . step = frame . stepExternal ; isRocket = val ; }
forces applies from this are attached to the current frame
forces applies from this are attached to the current frame