How much can a boat safely tow?

I often tow my 16ft sports boat and it barely slows me by 1 knt, (40 hp diesel, 10m heavy displacement yacht) but all in relatively calm waters. the line stays taught so no snatching. the boat is reasonably hydrodynamic so the drag is no where near what is to be believed
A speed boat has a D ring under its bow for dragging the thing out of the water with the trailor winch , uphill . Cant see that failing under tow considering the loads it endured being pulled up onto a trailer with no rollers.
I often tow it from portsmouth harbour to IoW. Its more sociable everyone sitting on the yacht chatting whilst towing rather than a lone skipper driving the sports boat and a larger saving in fuel costs.
 
I often tow my 16ft sports boat and it barely slows me by 1 knt, (40 hp diesel, 10m heavy displacement yacht) but all in relatively calm waters. the line stays taught so no snatching. the boat is reasonably hydrodynamic so the drag is no where near what is to be believed
A speed boat has a D ring under its bow for dragging the thing out of the water with the trailor winch , uphill . Cant see that failing under tow considering the loads it endured being pulled up onto a trailer with no rollers.
I often tow it from portsmouth harbour to IoW. Its more sociable everyone sitting on the yacht chatting whilst towing rather than a lone skipper driving the sports boat and a larger saving in fuel costs.

Sorry, but forum rules state that anyone who has specific, direct and relevent experience of the proposition under discussion will be disqualified and ignored so that other forumites can continue to theorise and pontificate! ;)
 
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