Convert JS to C#

I have been working on converting this Js to C# but i got a few last bugs I cant get out some one please help me.

JS version

 var driveForce: float;
 
 var hoverHeight: float;
 var thrustForce: float;
 var steerForce: float;
 var steerPosZ: float;
 var damping: float;
 
 var thrusters: Vector3[];
 
 
 
 
 function FixedUpdate () {
     var hit: RaycastHit;
     
     for (i = 0; i < thrusters.Length; i++) {
         var wdThruster: Vector3 = transform.TransformPoint(thrusters[i]);
         
         if (Physics.Raycast(wdThruster, -transform.up, hit)) {
             var discrep: float = hoverHeight - hit.distance;
             var upVel: float = rigidbody.GetRelativePointVelocity(wdThruster).y;
             rigidbody.AddForceAtPosition(transform.up * (thrustForce * discrep - upVel * damping), wdThruster);
         }
     }
     
     var fwd: float = Input.GetAxis("Vertical");
     rigidbody.AddForce(transform.forward * (driveForce * fwd));
     
     var steer: float = -Input.GetAxis("Horizontal");
     rigidbody.AddForceAtPosition(transform.right * (steerForce * steer), transform.TransformPoint(Vector3.forward * steerPosZ));
 }
 
 
 function OnDrawGizmos() {
     for (i = 0; i < thrusters.Length; i++) {
         Gizmos.DrawWireSphere(transform.TransformPoint(thrusters[i]), 0.1);
     }
 }

C# version so far:

 using UnityEngine;
 using System.Collections;
 
 public class HoverBoard : MonoBehaviour {
 
 float driveForce;
 
 float hoverHeight;
 float thrustForce;
 float steerForce;
 float steerPosZ;
 float damping;
 
 Vector3[] thrusters;
 
 
 
 
 void  FixedUpdate (){
     RaycastHit hit;
     
     for (i = 0; i < thrusters.Length; i++) {
         Vector3 wdThruster = transform.TransformPoint(thrusters[i]);
         
         if (Physics.Raycast(wdThruster, -transform.up, hit)) {
             float discrep = hoverHeight - hit.distance;
             float upVel = rigidbody.GetRelativePointVelocity(wdThruster).y;
             rigidbody.AddForceAtPosition(transform.up * (thrustForce * discrep - upVel * damping), wdThruster);
         }
     }
     
     float fwd = Input.GetAxis("Vertical");
     rigidbody.AddForce(transform.forward * (driveForce * fwd));
     
     float steer = -Input.GetAxis("Horizontal");
     rigidbody.AddForceAtPosition(transform.right * (steerForce * steer), transform.TransformPoint(Vector3.forward * steerPosZ));
 }
 
 
 void  OnDrawGizmos (){
     for (i = 0; i < thrusters.Length; i++) {
         Gizmos.DrawWireSphere(transform.TransformPoint(thrusters[i]), 0.1f);
     }
 }
 }

I am getting there errors :

error CS0103: The name i' does not exist in the current context error CS0165: Use of unassigned local variable hit'

error CS1502: The best overloaded method match for UnityEngine.Physics.Raycast(UnityEngine.Vector3, UnityEngine.Vector3, out UnityEngine.RaycastHit)' has some invalid arguments error CS1620: Argument #3' is missing `out' modifier