20%
Hello,Ideally, your traveler should be getting about 20% of the sheet load. But it sounds like you can add a bunch of friction to tht number. Much of this will be in the car, as lousy or aged bearings will behave much differently under load. Some friction will occur at the sheaves, depending on their efficiency and how they are rove. You might not have enough purchase to begin with. And some friction might be coming from the downward pull that results from a curved track. My experience is that the car, sheaves, amount of purchase, and reeving have a much larger effect on traveler efficiency than eliminating the curved track, unless the camber is extreme. And going to a straight track can involve some installation headaches, as well as building a longer moment into the supports. So I'd start by calculating the mainsheet load (see the Harken catalog), then finding the traveler load, then seeing what that gives you on the rope end. If it's over 35lbs in a moderate breeze, consider more purchase. Fair leads,Brion Toss