Bensen rotor, 3 blade Mac prop, other 3 blade prop??

[Aerofoam]

What do the metal pawls do?

 

[Mayfield]

What do the metal pawls do?

It looks like an Ivo Prop Magnum. Those pieces of metal are attached to rods extending into the blades. A barrel in the hub engages them and twists the blades to change pitch. They look pretty rusty. If one snaps it would release the twist on that blade.

Jim

 

[ultracruiser41]

It looks like an Ivo Prop Magnum. Those pieces of metal are attached to rods extending into the blades. A barrel in the hub engages them and twists the blades to change pitch. They look pretty rusty. If one snaps it would release the twist on that blade.

Jim

Yeah, I wouldn’t fly those

 

[Aerofoam]

It looks like an Ivo Prop Magnum. Those pieces of metal are attached to rods extending into the blades. A barrel in the hub engages them and twists the blades to change pitch. They look pretty rusty. If one snaps it would release the twist on that blade.

Jim

So they are torque rods, I would think they would be hard to keep consistent....

 

[ultracruiser41]

So they are torque rods, I would think they would be hard to keep consistent....

Yeah, actually work very well but I’ve had three of those rod snap on a plane before

 

[Aerofoam]

Yeah, actually work very well but I’ve had three of those rod snap on a plane before

How bad is it to lose 1?

 

[BrianInVa]

Isn't that an in-flight adjustable Ivoprop?

Dunno.

That’s a ground adjustable Ivo

Is that a good prop? Should I try to sell it instead of making it wall art?

 

[BrianInVa]

Yeah, I wouldn’t fly those

Ok that answers my question, thanks.

 

[Mayfield]

Yeah, actually work very well but I’ve had three of those rod snap on a plane before

I've had several over the years and they worked well. I don't remember if torquing the rods increases or decreases blade pitch. Are the blades at max pitch, minimum pitch or something other when the rods are not torqued? I can think of arguments for all three cases, but just don't remember which it is.

Jim

 

[quarter_cordless]

I've had several over the years and they worked well. I don't remember if torquing the rods increases or decreases blade pitch. Are the blades at max pitch, minimum pitch or something other when the rods are not torqued? I can think of arguments for all three cases, but just don't remember which it is.

Jim

The ultralight IVO blades are at 'medium' pitch when the cams are centralized in their groove and the cam bolt tension is relaxed. Adjusting the cam bolt can either increase or decrease pitch from 'medium' depending on which way the cam bolt is turned. Due to the way the cams all ride in the same common groove of the cam adjuster, all pitch changes are equal and occur simultaneously in each blade. Simple and rather ingenious, IMHO. A diagram on the mfg home page depicts this: https://ivoprop.com/
5.5 turns either way is the adjustment range limit on the IVO ultralight models, else something's gonna give that wasn't designed to give.