Twin headsails for trade wind sailing

[moseriw]

a parasail is sort of a glider. Due to it's foil it stabilizes the roll and tends to lift the boat upwards. And it is heavier weight clothed and sort of under dimensioned.

i.e. for my Vagabund 47 a spi can go up to 160 m² but the parasail recommended only 110 m²

[moseriw]

but the parasailor's price is around 700-1000 USD

[Jim Cate]

Originally Posted by moseriw

but the parasailor's price is around 700-1000 USD

I think that you are around an order of magnitude low in that pricing. Just look at the offering prices for those that are for sale used, here on CF. They are far dearer than "common" kites for a given size boat.

Jim

[Michael Cobbe]

The problem with twin headsails is they push against the mast one way then the other way causing the the boat to roll more, we had a free flying Twistle which causes no rolling. An example is here: https://www.simetric.co.uk/twizzle_rig/

[smacksman]

Originally Posted by sanibel sailor

How sophisticated does the twizzle rig pole joining gear have to be? Would a simple metal ring work in a 35 footer?

We sailed a heavy old 40 foot ketch and the relatively light loads on the rope crucivix didn't make a dent on the rope after a couple of thousand miles.
With a ring, the pole ends will still cross over (as with a rope crucifix we eventually found best; cheapest; lightest) but you may have problems with the axial pole loads bending the pole end fittings on the ring. This happened very quickly on the Mark 1 (expensive; heavy) version of our crucifix shown on my page here -.
https://simetric.co.uk/twizzle_rig/development.htm

Restricting the natural angles formed by the pole ends quickly destroy the fittings.
I must say here that there may be better solutions out there; just that this twizzle layout worked well for us after a bit of trial and error.