lml@lancaironline.net Mailing List Archive

Barry, I have the same prop. I'll have to check the governor when I get home. Your description does not match the behavior of my installation. I can get it to feather with the prop control. Once there and prop stopped it takes about 20 secs of cranking to get it out of feather. I would like to understand the prop lock a little better. How does it interact with oil pressure, for example? If my prop is still windmilling at 1000 rpm will I be able to get it into feather? Maybe someone on the list knows. Colyn On Jun 20, 2011, at 5:00 AM, F. Barry Knotts wrote: > Jeff, > I think I have the same full feathering Hartzell prop on my IV-P (HC-H3YF-2UF). The governor is a McCauley #DCF290D7X/T3. I can control the speed, but I can't feather this prop with the prop control. I was told at one time that this prop is designed for racing and it only will go to full feather if two things occur simultaneously; loss of oil pressure and RPM above 1200. Then it locks in feather and you do whatever you need to do to get on the ground. The only way to unfeather it at that point requires attaining 1200 RPM WITH oil pressure. Tough to do with the starter, the engine must start and produce oil pressure...while feathered. > > These two things conditions for feathering should only occur together if you have a catastrophic loss of oil pressure with a windmilling prop (or driven). Otherwise, you would have the prop feather every time you shut the engine down. > > So my question is: How did you get it to feather? Do you have a different prop governor? I called Hartzell once and they said that they did not have a recommended governor for the prop. (That seemed a little strange.) > > Inquiring minds.... > > Barry Knotts > Lancair IV-P, N4XE > > On 6/19/2011 11:30 AM, liegner@earthlink.net wrote: >> I have practiced engine out glide with my full feather three blade >> Hartzell prop (Model number HC-H3YF-2UF) in the full feather position >> and fully stopped. > > > -- > For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html