Hey Adam,

If I am not mistaken, if the engine stops producing power, but the propeller is spinning, you'll have plenty of oil pressure.

If the engine seizes, then oil pressure goes away, but other failures I think will allow you to change prop pitch.

Kevin

________________________________________
From: Lancair Mailing List [lml@lancaironline.net] On Behalf Of Adam Molny [Adam@ValidationPartners.com]
Sent: Thursday, November 21, 2013 5:49 AM
To: lml@lancaironline.net
Subject: [LML] Propeller options for the Legacy?

It’s looking like I won’t be able to get a replacement blade for my Aerocomposites prop, which means I’m in the market for a whole new prop. How do I go about choosing? Which is better, Hartzell or MT? Feathering or non-feathering? Are there any other options out there? I’m even open to getting a used prop.

Lancair lists their various prop options here<http://www.lancair.com/index.php/our-aircraft/legacy/options-rg>. Hartzell typically has a 6-8 week lead time. Not sure about MT.

The MT’s weight is more in line with my old prop (which was 50lbs). But I have heard reports of MT props slinging oil/grease due to seal problems. The Hartzell is tried and true but much heavier (and it only comes in that boring gray color!).

Feathering vs. non-feathering – the standard props we use go to flat pitch if we lose oil pressure. But that’s only a single type of engine failure. If the engine quits completely for any other reason oil pressure will bleed off. Once that happens moving the prop lever to low pitch won’t have any effect. Do I have that right?

I would greatly appreciate any and all thoughts and discussion on the matter.

Thanks,
Adam Molny