Boom tent idea

I have a "tent" made from the same material as the sprayhood. The tent is zipped to the sprayhood and suspended from the backstay attached over the lifelines and down to the toe rail via bungee cord. Works well you can sit in the cockpit and are sheltered from the wind and rain - ideal for drying ollies while at anchor.
 
As others have mentioned, it is important to use shock cords as ties since this greatly reduces the flapping. Much depends on how far aft the boom goes. Most boats will only need a rectangle but some short booms may be better with a tailored tent.
 
I made a cover out of sunbrella material 2 years ago. I use my spin pole as a ridge pole and shock cords that attach/hook to the station wires. the primary use of the cover is to protect the cockpit when not in use. I do though raise the pole in the summer and it provides excellent shade from the sun and the rain. 2 years in the sun and the material is perfect. could last years.

Steveeasy
 
I'd just say use the heavier fabric and don't economise, you're going to wonder why you didn't do it years ago and you'll hate yourself if you have an ill-fitting flappy embarrassment.
 
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Order some Material Marine Grade on this site and if you have or your partner a good sewing machine very easy to make yourself with Brass eyelets.
Don't think it is hard I let the Wife loose with one after a drunken discussion that she couldn't do it and ended up ordring one online that night , and to give her Credit she did all the Curtains on the boat and moving on to Dodgers and Sun Cover (she's is no domestic Godess but I still love her :D)

https://www.profabrics.co.uk/
 
+1
I think that if you use spinnaker cloth the tent is likely to flutter a lot.

I am looking at my North Face climbing tent as I write and that is made of rip stop nylon BUT it depends entirely on inserted alloy tubes, so there is no edge under tension to start fluttering.

+1. Exactly my thoughts. Fluttering would drive everyone mad
 
You can extend the headroom under the tarp by using a couple of old fibreglass tent poles under the back and centre. We have one made from acrylic canvas. The attachment points are all webbing loops (far stronger and longer lasting than eyelets). The poles are sprung into 5 loops of webbing, one each end and 3 spaced across the width.
Ours actually fits under the boom attached by a longish strop to the mast and to the backstay, forward corners with strops to the aft lowers. The boom and mainsheet are swung to the rail.

2018-07-08-DSC02423.jpg
 
I have re-purposed my tent sun shelter (2mx2m), with shock cord and clips to the rails, similar to this...
 

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