FixedUpdateGrounded

        var emissionRate = 0;
        if(grounded)
        {
            body.drag = groundedDrag;
            emissionRate = 10;
        }
        else
        {
            body.drag = 0.1f;
            thrust /= 100f;
            turnValue /= 100f;
        }

        for(int i = 0; i<dustTrails.Length; i++)
        {
            var emission = dustTrails[i].emission;
            emission.rate = new ParticleSystem.MinMaxCurve(emissionRate);
        }