Beginning my 1987 Fisherman 20 Restoration

[Myfathersson]

Originally Posted by phatdaddy

Looks good, i know expansion and contraction is an issue on poly tanks, be sure to factor that in.

Keep up the good work

Thanks for the reminder phatdaddy - 3% expansion once fuel is introduced. That's about 1.3" on the length, 0.9" on the width, and 0.37" on the height. All easy to accommodate. Might need to install the hold down brackets after fueling to manage the gain in the length since the threaded inserts are not symmetrical about the axis. Only drawback to that is I can't through bolt both pairs to the stringers once the sole is in place, only the forward bracket will be accessible on the back side. That's a minor issue though, as the brackets closest to the center are the accessible pair which should result in less stress on the rear most brackets. Only other adjustment is I'll use the hot knife to trim the 2" foam blocking at front and rear down.