Look in the legacy adapters section
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Thanks! Found it!
This blog post is interesting, but I think there is a big assumption in the analysis that is completely overlooked and not mentioned at all, which is laminarity. I think the analysis is theoretically correct, but it assumes good laminar flow. That cannot be stated as a fact.
Suppose you have a mast that is not perfectly sanded to a race finish, but extruded, anodized and welded, leaving a surface with macro and micro roughness, add a few scratches, sunscreen marks, some turbulence from the water surface and bubbles from breaking waves, and I think that most users experience much less laminarity than the CFD software was configured for.
If one assumes non-laminar flow, thickness suddenly matters a lot more. In non-laminar flow, thinner sections can generally perform better.
Maybe this explains the different viewpoints?
I’m not convinced.
Cedrus paid to use America Cup modeling which more than likely incorporate turbulent flows.
Thicker sections, tubercles, similar to AFS perform exceptionally well in turbulent water.
Very thin section would have a harder time to keep the water attached to the surface as soon as you change the angle of attack (or angle at which the turbulent water attacks the leading edge).
I am with Josh on Cedrus engineering. Laminar flow from a weld is less than a .001%. I say that because you must include all components including foil and board at takeoff. Once out the foil is still the issue with laminar flow and is the greatest impact on stiffness.That’s common sense because or what’s physically in the water when on foil. It’s also common sense because of the size of the object being pushed through the water. Mush mor linear and surface area from foil than mast when riding.
I do support your desire for nasa engineering and a super high value ride , but I would much rather get spacex engineering and ride everyday. 
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My thoughts on the Cedrus Clydesdale for pumpfoiling. Jury is still out on it for LW parawing as the noise levels are a bit much when paired with my ML board.
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You don’t think the forged aluminum would be stiff enough? Waiting to see if a pad on the base plate cures the noise.
I’m sure the Forged is a stiff mast but I want the stiffest mast. This is for pumping my 159 and 151 span wings so the stiffer the better.
If you are curious to hear how loud it was I left a few seconds in this video without the audio filter and you can here it here:
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Ha,ha. I saw your video yesterday. That is why I was wondering if the forged was better. Maybe with your DW board and hollow mast (not forged) it causes the excess noise. There are a few guys in your area that have them (forged). But yours (clyde) is loud as hell. At least with all the traffic they will move out of the way.
I wonder if putting a rubber insert inside the mast before welding would help. That should change frequency and damping the vibration.
It seem strange to me that the people spend so much energy to have the most direct feeling between the feet and the foil (harder deck foampad, stiff track box installement, stiff mast, stiff fuse connection…) and then put a soft rubber pad between the mast and the board.
I’ve never rode a setup where it had a rubber pad between the mast plate and the board but can you feel a difference in stiffness/directness?
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Not sure about current production, but my original Axis mast from 2020 has a high density rubber pad roughly 1/16" thick on the base plate to contact the board.
Its plenty stiff…
I agree. I made a pad and tried it on my forged cedrus. It dampened the noise slightly but it seemed to change the direct connected feeling with the mast so I removed it. That feeling is more important to me than a whistle.
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The rubber shim definitely lowered the whine a bit and I think make it happen far less frequently.
I didn’t seem to notice any less direct connected feeling.
Next step is to try different front wings / stabs to see how they sound. I think it might be my stab that is responsible for a lot of the vibration.
You touched on something interesting here that may be getting lost in the discussion. Can it be argued that the mast isn’t loud? And that the foil and the stab are loud? The mast is just amplifying something that has always been there.
If that is the case than the vibrations are a sign of inefficiencies in the setup. Going to a carbon mast that dampens the sound doesn’t take away from this fact.
I would be very interested in knowing which setups are whisper quiet on a cedrus aluminum.
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We need to consult some audio engineers on this topic.
I too have experienced the loud droning sound from cedrus alu. the curious thing was that this happened on the same set ups but on one particular day it was so loud that thought there was something off with the entire foil set up. maybe water temps have something to do with it?
Interesting thought for sure.
I wonder if anyone with set ups that are silent?
If anybody wants one, my 78 forged is available. Cheap too!
slappy yep that’s the noise I get too with my Cedrus 78 forged with ny 1180 axis spitfire I put a pad on my baseplate too but she’s still singing, kinda got used to it actually LOl,I really like the cedrus for its stiffness with the larger wings I ride at 100kgs+ guess we will just have to live with it I suppose, but that said wish it were not making that noise
Just so people reading know there’s also a different perspective on this. My Cedrus makes some noise but it doesn’t bother me in the slightest. I don’t really hear it anymore. Or maybe I enjoy it? I have a 78 and just ordered an 85cm. It’s a great mast!
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