Hi Lacrystol,
I forgot about my thread after my bad hatching and had chicks hatching shortly afterward. Here is the update. I have a fan force incubator with autoturn function, humidity and temp control. I hadn't gotten a liquid thermometer at the time of hatch but think the incubator temp is fairly close to what the monitor says (if not slightly lower), as 100% of chicks incubated at the same time hatched. The incubator was set at 38 degrees (100.4) and about 50-55% humidity. Stopped turning at 25 days and opening briefly to add water. None of the first batch of duckling hatched. Most reached a large size, some pipped but failed to hatch, others died before pipping. all air sacs seemed very small.
I had a second set in the incubator 2 weeks younger, but couldn't do much to increase air sac size, dropping the humidity didn't do much. From the second set of eggs, all developed to late stages. I had a separate incubator but no humidity controls so followed instructions filled all wells and added some dishes of water also. Set fan forced incubator at 37.2 degrees (99). 4 pips from 10 eggs. 2 pipped day 26 but failed to unzip, 1 pipped day 27 failed to unzip, 1 hatched easily day 28 strong and healthy.....
All the air cells were quite small.
I have had my 3rd batch at 37.8 degrees (100), 40% humidity and misting daily until day 20. The air cells are alot larger than the first batches, all ducklings seem to be quite active in the eggs. Moved to hatching incubator today Day 25, full water trays and and extra bowl, temp 37.5 (99.5). I have also not been weighing these ones as often. This is also the duck and drakes first year.
I am hoping for a better outcome and will keep you posted. Lacrystol I shall visit the links you suggested first thing tomorrow and really appreciate the advice, especially the safe hole, and I didnt realise I could have the humidity that low...wow so much to learn.....