What is the best gooseneck/kicking-strap (vang) for the MX Goth RG65?
One possibility seems to be the SailsEtc 012RG. A drawing is shown at http://www.sailsetc.com/downloads/2014/12RG.pdf. Although I can’t tell for sure, it appears by the drawing that the upward movement of the boom is restricted (the heel of the stainless steel plate rests against the head of the adjustment screw) but there is nothing but the sail to restrict the downward movement. If that is the case, the 012RG acts very much like a boom vang on a full-size sailboat. Did I get this right? Is this okay on the RG65? (Other gooseneck/kicking-strap assemblies for larger RC sailboats often restrict the movement of the boom in both directions.)
The 012RG would seem to put the boom about 30 to 35 mm (or higher) above the deck (or above the CF tube into which the 8 mm mast is set). Does that put the foot of the sail too high?
The angle of the boom (assuming the mast is vertical) is adjustable between 0 and 18 degrees. Is that about right for the Goth RG65?
Has anyone out there used the 012RG with a Goth RG65? Suggestions?
Another possibility would be to use an IOM gooseneck (like the Variant Marine VM001 from Brighton Boat Works, http://stores.rcsailboatparts.com/variant-gooseneck-pack/) and modify it to make it work on the RG65. It seems one would need to disassemble the gooseneck and cut the “body” down, perhaps making it half as tall as it is now. That would reduce the body from 45 mm to about 22 mm. Then one would have to carefully crimp the edges of the “body” so it would fit snugly onto an 8 mm mast. (The VM001 is designed to work with a mast of 10.9 to 12.7 mm OD.) Alternatively one would need to "pad out’ the 8 mm mast so it would accept the larger gooseneck body.
The shortened VM001 could be mounted either “boom up” (as is done on the IOM) or “boom down”. The latter would allow one to position the boom nearly on the deck (or nearly at the end of the mast tube). But if you mount it “boom down” then the kicking strap will be in compression rather than in tension. That seems (to me) to be a possibility, but I would like some “expert opinions” first!
Any thoughts or suggestions about this possible (modified VM001) approach?
Does anyone have any better (or alternative) suggestions? I am willing to buy a gooseneck (even the more costly SailsEtc 11c) and modify it if that is the “best” way to go. I could design and make my own, but that seems to me to be the “hard way”.
I have available to me a lathe, a milling machine, and all of the normal (and some out-of-the-ordinary) tools at my disposal. But I’d rather not be a pioneer if I can avoid it!
One last thing: I would really like to have a ball-race gooseneck as I have seen (on my ODOMs) that it makes a difference in very light airs.
What about taking the DF gooseneck and modifying that? The bearings in the DF gooseneck are only 5 mm ID, so they would have to go, as would the part that goes around the mast (the body). I’d have to design and make a new body to accept larger bearings (required to slide over the 8 mm mast). But since I have the tools, that’s not at all out of the question.
This is getting more in line with the approach taken with the SailsEtc 012rg. The boom pivots around the centerline of the mast. Compare that with the modified IOM gooseneck approach in which the boom pivots about an axis that is 9 or 10 mm aft of the mast centerline.
One advantage here (a modified DF gooseneck) is that the kicking strap is rigid (in compression and tension) and there is no doubt about what is controlling the boom angle!
Lacking any other inputs, I’ll proceed down the “modified DF gooseneck” path for now.