Would an Axis carbon mast user please tell me whether their length is overstated by 25mm as is the case for their ally masts? Is this the case for other brands or does Axis have this rampantly misleading habit all to themselves? And is there any evidence that they (and others??) are giving up that bad habit any time soon?
Select to expand quotetaveray said..
Would an Axis carbon mast user please tell me whether their length is overstated by 25mm as is the case for their ally masts? Is this the case for other brands or does Axis have this rampantly misleading habit all to themselves? And is there any evidence that they (and others??) are giving up that bad habit any time soon?
Every manufacturer measures masts differently, some from the top surface of the mast plate to the top of the fuselage. Others from the top of the mast plate to the bottom of the fuselage, there is no standard.
Select to expand quotetaveray said..
Would an Axis carbon mast user please tell me whether their length is overstated by 25mm as is the case for their ally masts? Is this the case for other brands or does Axis have this rampantly misleading habit all to themselves? And is there any evidence that they (and others??) are giving up that bad habit any time soon?
Tell us the mast you have, your measurements and how you measured it.
Select to expand quoteairsail said..
Every manufacturer measures masts differently, some from the top surface of the mast plate to the top of the fuselage. Others from the top of the mast plate to the bottom of the fuselage, there is no standard.
I never realized that. Seems Axis uses top surface of the mast plate to the bottom of the fuselage, Armstrong uses something else. When measured, the 4 cm difference between a 75 cm Axis alu mast and a 71 cm Armstrong mast pretty much disappears.
I dug into this a while back and if I recall correctly the axis ali mast sections are shorter than their stated length to accommodate for the added base plate and fuse. Then to add to the confusion an ali setup with base plate and fuse actually end up being 20mm longer than the stated length so the 820mm ali mast the whole setup is 840mm. The carbon masts the whole setup ends up being the same as the stated mast length so an 820mm carbon mast the whole setup is 820mm.
A bit confusing I know!
Yes confusing world where nobody likes to do anything like anyone else. The way i say it on our ONE mast is wetted surface area so anywhere that is in direct contact with the water so excludes the mast foot as that is inside the fuselage is one measurement and then give the measurement from top to bottom including the mast foot. Eg our 78cm mast is 75cm wetted surface area and 78cm top to bottom.
I guess these days you just have to give all the info and hope people can work it out.
Thank you all Gentlefolk. I was just measuring the length of the ali masts themselves (of which I have 5), i.e. excluding the 'doodad' that you attach to the bottom and the base plate at the top. I can now see that trying to set a standard that might work at least for comparisons with Axis carbon masts, you would need to allow for those two items because they might be different on different setups - as some of you have pointed out. I can see that, for different purposes e.g. checking how the mast will affect the depth of water needed (my main concern), likely flex or stress loadings, etc., you need different measures (e.g. for depth of water, the best might be bottom of fuse to board/top of base plate). In my case, (thinking of switching to carbon), that is the relevant measure, so thanks for providing that example, Youngbreezy.
