Catto vs Sensenich or Hartzell?

[ship]

at the other end of the price spectrum, if only Hartzell would offer the blended prop in true-composite form (no wood core) we'd have the ideal prop. I actually pressed Hartzell on this idea 2 years ago during testing, but they don't have any interest due to high price point/low volume. I'm convinced they would eat MT's lunch with this prop.

[osxuser]

Originally Posted by ship

at the other end of the price spectrum, if only Hartzell would offer the blended prop in true-composite form (no wood core) we'd have the ideal prop. I actually pressed Hartzell on this idea 2 years ago during testing, but they don't have any interest due to high price point/low volume. I'm convinced they would eat MT's lunch with this prop.

I personally don't like composite props for the normal GA airplane. I think the lycomings run better with the extra flyweight of the metal blades. But thats just another one on my opinions. We had a Malibu with a four blade composite on it. The owner had to rev it to 2000rpm to get it to catch when trying to start it. Not good...

[cjensen]

Originally Posted by osxuser

We had a Malibu with a four blade composite on it. The owner had to rev it to 2000rpm to get it to catch when trying to start it. Not good...

we are a malibu shop, and i see this all the time. those four blade lightweight composite props are hard on engines! they all start the same...crank till it fires, and send the rpms soaring!! sounds horrible to me.

[hevansrv7a]

Yes I heard there might be some give or flex with wood props? I don't know. I do know 10-15 years ago someone made a radically swept Scimitar/helical propeller (scimitar = curved leading edge). The idea was under load (takeoff) the prop twists flatter for higher RPM. As you speed up the disk load is less and the prop twists back, making it coarser, keeping RPM lower. Well the radical design did not make it, because they broke (a lot).

I don't know about any failures years ago, but Prince is still selling that (flex) kind of prop. I had one of his many years ago that turned over 6000 rpm routinely with a length of about a yard, more or less. It met my requirements at the time quite well.
http://www.princeaircraft.com/
The claim of a few inches of change seems reasonable to me. Prince has been in business a long time and has an impressive client list. I'm planning on putting his carbon fiber over wood model on my IO-360 XP very soon.

[gmcjetpilot]

Originally Posted by hevansrv7a

I don't know about any failures years ago, but Prince is still selling that (flex) kind of prop. I had one of his many years ago that turned over 6000 rpm routinely with a length of about a yard, more or less. It met my requirements at the time quite well.
http://www.princeaircraft.com/
The claim of a few inches of change seems reasonable to me. Prince has been in business a long time and has an impressive client list. I'm planning on putting his carbon fiber over wood model on my IO-360 XP very soon.

The web site is a little lacking. What models and prices do they have? G

Originally Posted by osxuser

I still recommend going with a parallel valve FI engine over the straight O-360 A1A. BUT this is strictly from the viewpoint of running LOP operations to save fuel .

Yea but you did not buy a good 600 hour O360A1A for $2,000 , Sweeeeeet!

[osxuser]

Originally Posted by gmcjetpilot

The web site is a little lacking. What models and prices do they have? G

Yea but you did not buy a good 600 hour O360A1A for $2,000 , Sweeeeeet!

For that reason, I might be using a O-540 260 HP in my -7...