flapper flipper

using UnityEngine;

public class FlapperFlipper : MonoBehaviour
{
    public Transform flapper;

    public float RotationAmount = -270;
    public float rotationSpeed;

    private Vector3 ClosedRotation;
    public float currentTime;

    public bool isOpen;

    private void Start()
    {
        currentTime = 0;
        ClosedRotation = flapper.localRotation.eulerAngles;
    }

    // Update is called once per frame
    void Update()
    {
        if (isOpen && currentTime < 1)
            currentTime = currentTime + rotationSpeed * Time.deltaTime;
        else if (!isOpen && currentTime > 0)
            currentTime = currentTime - rotationSpeed * Time.deltaTime;
        flapper.localRotation = Quaternion.Euler(ClosedRotation + new Vector3(0, 0, Mathf.Lerp(0, RotationAmount, currentTime)));
    }
}