Ron wrote:OK - Finally connected with Bill at Garhauer. The standard line control sheeves on both cars are 1.8 inches wide including the top plates - with the fixed car having 2 stacked sheeves with becket and the slider having the fiddle. He will do almost anything we want to make it fit. Try asking Schaeffer, Harken, Ronstan or xxx to modify one of their systems for maybe 10 to 15 boats !!!! You won't get it unless your last name is Ellison or similar. Besides making top quality equipment for a reasonable price, they have always excelled at customer service - before and after the sale.
Their gear is quite nice, especially given the price and customer service.
We can go smaller with the same layout (4 to 1 purchase) - meaning maybe 1 1/4 inch wide sheeves and top plates. Or even smaller if necessary. I'm not sure if this would stop the stacked car from still rubbing on the window on some of the boats. The double height could be a problem.
At least on my boat, clearance was only a problem at the very front end of the track, where the car wasn't really on the track. Moving it back to where it is now, as seen in the photos, aft of a track-mounted cleat, it is just fine. In theory, this shouldn't be much of a problem, as the track is 1-1/4" wide to begin with. Hopefully, on most boats, the track isn't under the window. If track isn't under the window and has even a tiny gap, then the sheaves should fit.
We could put a single sheeve with becket on the slider and a fiddle on the fixed car, giving a 3 to 1 purchase. And use smaller sheeves as well if needed, This would lower the height of the fixed car to get it under the window. Two fiddles is another option - with the becket on the fixed forward car.
As for the purchase ratio, I think it needs to be 3:1 at a minimum. The Telstar does have a fairly decent size genny, and unlike a monohull, when the wind picks up, it doesn't bleed off much of the force by heeling.
Finally, we have to find out if the boat comes with a Schaeffer track. I'm pretty sure it does becasuse the standard genoa car is a Schaeffer. This track is slightly different than all of the other 1 1/4 inch tracks out there. It's got a thicker top plate and this could be one of the reasons why one of the owners had several problems installing his Garhauer genoa cars. The standard ball bearing Garhauer will not fit this track properly.
I don't know if the track is Schaeffer, but the cars I ordered did fit. IIRC, I did tell them that the track was a Schaeffer track though, when I placed my order, so they may have made the adjustment for the thicker T-section due to that.
Any of these would probably fit my boat, which has 1 3/4 inches from the middle of the track to the cabin up front and 3 1/2 inches at the back. I'm not sure which hull number got the new walkboards and ledge. There may have been two previous designs on the boat also which changed the size and shape of the ledge holding the genoa track. I have to find out the exact distance from the track to the cabin wall on some other boats to see what version will work on all of them.
As I said earlier, I should have some measurements and photos this weekend, provided we only get a foot of snow...
It might be good to make up a table with the hull number and measurements of various boats, to see if this is design change related or not.
I'm leaning towards the 3 to 1 purchase with fiddle on the stationary car and sheeve with becket on the slider, but ??? I had Garhaouer geneoa cars with a 4 to 1 purchase on my last boat, with a genoa the size of the entire Telstar sail plan (deck sweeping 155 on a 62 foot mast). That boat called for 4 to 1, not sure if we really need it here. We have to keep the cars low to clear the window on some of the boats.
I don't know if a 4:1 is necessary, but just remember the forces on the sails on a multihull are generally higher than they are on a monohull with the same size sails, since the boat can’t bleed off excess power by heeling.
As an example, my friend's Dehler 33 has a 155% genoa that measures about 360 sq. ft., yet his primary winches are only Lewmar 30STs. Given that his boat is a racer/cruiser, I seriously doubt the winches are undersized by much, if at all. The standard genoa winches on the Telstar 28 are Lewmar 40STs, which give 33% more leverage in low gear, for a sail 2/3's the size—effectively giving the Telstar sailor twice the leverage at the winch of the Dehler—per square foot of sail area.
While this is only a single example, I'd also point out how heavy the rigging is on the Telstar 28, for a 28' boat—because it is a multihull. Some of the sailors on this forum might need the 4:1 purchase to deal with the full genny at the top of its wind speed range.