Over forty years ago I used to tow gliders for the RAE gliding club at Farnborough and for the Kent gliding club using a Tiger Club Tiger Moth. The gliders were for the most part primary lead sleds, and towing at 50kts full throttle with the oil temp rising, the complaint was always that I was towing too fast!
But what a difference towing at the Nationals with high performance machines and experienced pilots! And what crowded airspace around the release zone!