there is no difference between compressive force created by the Aussie rig and original style jib halyard, there is no difference in the ability of either to cause the mast to bend.
Alan, you have not been able to substantiate your claims. You are unwilling or unable to show what balances the varying number of Fh forces in my diagram even though you agree that a simple sum of vertical forces is accurate enough. Once I take the external forces stuff out of your posts (you'll have to argue that to someone who disagrees with you, wherever they are) there isn't much left. We're talking internal forces here.
I really wonder if you know what the AH is. I keep thinking that if you looked at one, it would be clear to you.
You're the challenger here, convince us.
The Aussie halyard does not defy the laws of physics.
The halyard is nearly coaxial with the mast so the vast majority of its force is represented in the diagram. Even Alan agreed: "but for simplicity to discuss mast compression and how the Aussie rig reduces or does not reduce mast compression all you need to look at is the components of all vectors that are parallel to and act through the mast."
If you want to skip straight to the bending, great. That's what this is all really about. But that's not the same as saying there isn't a compression force.
No its not. The compression load is there and real. The *ONLY* thing I'm trying to get across is that is is not compression that forces the mast to bend.
One of the goals in rig design for systems that rely on the mast *NOT* bending under sailing loads is to keep the mast in column. This is because compared to a load applied at 90 deg to the mast it takes a metric cr*p ton of load to bend a mast out of column with compression.
I have never questioned the effect of changing to the Aussie halyard system. I have never questioned or argued that the mast reacts differently when that system is changed *even though* the total compression in the mast does not change.
Just stop trying to prove that mast compression is causing the bend that you observe, it cannot be done.
Yes the mast bends.
Yes, when the mast is bent it is harder to rotate.
Yes, the halyard system has an observable effect on how the entire rig behaves.
No, changing the halyard system does not change the total compression load in the mast.
No, it is not compression loading that bends the mast in the first place.
Who have I argued with there?