Having a strange problem with yield and instantiate (C#)

Questions & Answers
1

I’m having a strange problem. I want to make it so if the space bar is pressed, the player shoots a projectile every few seconds. I’ve tried 2 techniques so far, and the common theme seams to be that if the projectile is set to instantiate every 0 seconds, it explodes like crazy; anything greater, it makes a solid line with some glitchy movements.

Here are some screenshots: Imgur: The magic of the Internet

If you can think of any way I could space out the projectiles more, or why this is happening it would be very much appreciated.

using System.Collections;

public class player : MonoBehaviour {

	private Transform ship;	
	public int shipspeed = 5;
	public Transform shotPos;
	public float shotForce = 1000f;
	public Rigidbody projectile;
    bool con = true;
	
	void Start () {
	
		
		//spawn position
		ship = transform;
		ship.position = new Vector3(0, -7, 2);
	
	}
	
	void Update () {
 
       //Horizontal movement with arrow keys
       ship.Translate(Vector3.right * shipspeed * Input.GetAxis("Horizontal") * Time.deltaTime);
 
 
    //ship wrapping    
    if(ship.position.x > 6){
           ship.position = new Vector3(-6, -7, 2);
       }
 
    else if(ship.position.x < -6){
 
         ship.position = new Vector3(6, -7, 2);
		}
 
			
		//gun
			
			
			
    if(Input.GetButton("Jump")){
        StartCoroutine("Fire");
    }
    if(Input.GetButtonUp("Jump")){
       StopCoroutine("Jump");
    }
}
 
//luanch projectile
void Shoot (){
       Rigidbody shot = Instantiate(projectile, shotPos.position, shotPos.rotation) as Rigidbody;
            shot.AddForce(shotPos.up * shotForce);
    }	
	
	
//gun delay loop
	
IEnumerator Fire(){
           
		while(con == true){
		Shoot ();
			
			yield return new WaitForSeconds(1f);
		}		
    }
}
2

Don’t use StartCoroutine and yields in this case. It slows things down when you want things to be instantaneous.

using UnityEngine;
using System.Collections;

public class shootGun : MonoBehaviour {
	
	bool shotCooldown;
	private float timer;
	private float cooldown;
	
	// Use this for initialization
	void Start () {
		shotCooldown = false;
		timer = 0.0f;
		cooldown = 1.0f;
	}
	
	// Update is called once per frame
	void Update () {
	    if(Input.GetButton("Fire")){ //jump, fire, whatever you want the key to be
			Shoot();
		}
		
		if (shotCooldown == true)
		{
			if (timer < cooldown)
				timer += Time.deltaTime;
			else
			{
				shotCooldown = false;
				timer = 0.0f;
			}
		}
	}
	
	//luanch projectile
	void Shoot (){
		if(shotCooldown == false)
		{
			Rigidbody shot = Instantiate(projectile, shotPos.position, shotPos.rotation) as Rigidbody;
			shot.AddForce(shotPos.up * shotForce);
			
			shotCooldown = true;
		}
	}
}

If you can, try to use less spacing in-between sections of code. Change the cooldown variable to however long you want the interval between shots to be.