Vislon or coil or Uretek zipper; sewing zipper on curve; #2 coil zipper source?

Hi Sam

It doesn’t need to widen at the front to allow two people to get in and out. Parallel sides (or slightly bulging) and a bit of a vestibule are all you need.

That said, the real secret may be in having the groundsheet long enough. Mine are 2.2 m long, so it is very easy for one person to pass another and exit. This includes exiting at 2 am in the dark!

The red ovals are a fair approximation to a quilt or SB, so you can see the spare room.

Shock horror! All that extra length is extra weight!
Yeah, right. That is for one of my 4-pole 2-man winter tents. There is plenty of room inside it if you have to stop for a day in a howling storm, and the extra weight might be all of 100 g maybe. It is just light fabric. Which matters most: ideology, or comfort on a long trip?

Cheers

“It doesn’t need to widen at the front to allow two people to get in and out. Parallel sides (or slightly bulging) and a bit of a vestibule are all you need.”

Roger, I’ve tried to locate the old catalog with the BD tent, but no luck.  Promise I’ll send you an email when I find it.  It is the best designed tunnel I’ve ever seen.  Just too heavy.  But,  think most can see the benefits of having a duo tent grow wider and taller as it approaches the door(s) , which were canted beaks, one door on each side, and were separated by a sloping seam that led down to one front peg.  Would do that with a solo tent, except for the added weight of the second zipped entrance.

Your diagrams are great.  I almost flunked mechanical drawing, but Mr Swenson worked with me to get a passing grade.

Hi Sam
I have done ‘tapered’ on 1-man tents:

But the weight savings were miniscule.
Note: head to large end this time.

Cheers

Thanks, Roger.

Readers please note:  On January 14th, I posted on this thread stating that the #3 YKK zippers from Quest (and others) and the Warmlite #3 zippers from YKK weighed 1 oz per running foot, and 1.12 oz per running foot, respectively.  That was an error.  The no. 3’s from Quest and others weigh approx 0.1 oz per running foot, and those from Warmlite weigh approx 0.12 oz per running foot.  I apologize for the errors and hope no one was misled.  Thank you.