I have a question for you as you have built incubators for so long and have good experience hatching. I read this whole thread and the dry incubation article here on BYC.
I have a custom incubator with hatching drawer, 3 shelves and above that are 2 100 watt light bulbs in front 2 fans in back and at the back between the fans is the thermostat. There is a shelf at the bottom of the fans and it holds the water cup for humidity. Has it's own access door above it for adding water, a small hole in back for the turner cords to go out and that is covered with plexiglass but not screwed down tight, so gets a wee bit of air into the system there. Its at customincubators.com I believe.
So I have the bottom 2 shelves with egg turners running and put about 20 eggs centered on each shelf. Temps appear correct between all the thermometers, going for 101.5 for LF eggs?
After running it all day with the eggs in, finally got a humidity gauge in it and it measured 45%.
House temps run 62 at night up to 66 in the daytime and the bator is in an interior very small room corner with pass through open doorways.
Eggs were on turners for the past 10 days or so, been collecting them for 3 weeks at least until my bator got fixed and running. So maybe some of them are already are 'old'.
I will try running the bator for the first 18 days at 45% humidity, turning off the turners when they are level, stuffing any 'holes' along the sides with papertoweling so no one falls through to a different shelf.
I will increase humidity to 65%?? What would you advise? This is only about a 2 feet high bator by 17x17 or so, just enough to accomodate the turners deep and wide.
I will leave the temps alone and let them run as shown. Front to back and up to down, temps are at the back wall under the fans and the front viewing door and mostly Accurite thermo's, the only one showing 'high' is the fish tank gauge at 103, the one suctioned to the door is 99 and the back one reading at the bottom is 101.5. Since eggs are centered in the unit away from fans and light, I am hoping the eggs are at the right temp.
I will repost here my hatch rate for it's actually 39 eggs. They were all 1.9 to 2.0 ounce eggs.
Last year in this bator, with the unit outside in the garage in JUNE, I ran higher humidity I am thinking, temps were good, had 36 rockers on day 18 and 10 hatched. I'm thinking they were big butted 'wet' chicks mostly.
Is it ok to just turn off the turners and let them hatch there. I think taking them out and shifting them sideways on racks on day 18 helped mess up last year's hatch. This is a test hatch of the bator since a Silky Roo and 3 Welsummer Roos are all in with the Welsummer hens. He leaves TODAY to a 4-H home and in 3 weeks I will be able to reset the bator with pure Wellie eggs.
ALL ADVICE WELCOME!
Bonnie in NW Ohio