Glider
Captain
The Ulster Queen (a converted ferry) did exceptionally well largely down to Captain and the effectiveness of the crew. During attacks when he saw a group of approaching torpedo bombers he would leave the defensive ring and head directly at the incoming aircraft. As a result he put his gunners in a good position to fire but also disrupted the attacking formation.1) HMS Ulster Queen (6 x 4in, 1 x quad pom-pom and several 20mm) claimed 4 x AA kills during PQ18. USS Wainwright was the destroyer described above, but really her gunnery was not exceptional. Lundstrom rather carefully examined USN AA in the Pacific and it was no better than the RN's despite some claims to the contrary.
Re the USS Wainwright we will have to agree to disagree on this. She was became very important to the defence of the convoy while she was there, not because of the number of aircraft she shot down, but because of her ability to keep attacking formations away from the convoy. This was due to her accurate long range fire which was far better than the average RN fleet destroyer.
On the 4th July while approaching the convoy to refuel, she was credited with keeping one attack at such a distance that the torpedo's were not a threat, on a second attack that got closer she shot down one of the senior officers. Officially she wasn't part of the convoy escort being assigned to the Cruiser escort but happened to be refuelling and was in the right place at the right time. When she finished refuelling and was about to leave the convoy another large group of He111 approached and split into two groups. She opened fire at one group starting at 10,000 yards and kept firing until it was considered to be too close to the convoy, when she switched to the second group. Of the first group only one bomber launched its torpedo which missed and of the second group two ships were hit.
A couple more comments
1) If the Germans were totally happy with the Italian Torpedo's they wouldn't have asked for the blueprints of the Japanese torpedo's. The main problem with the Italian torpedo's was they didn't work that well in shallow water.
2) Germany lost 42% of its trained torpedo bomber crews. That shows how few they had to start off with