Quote:
Originally Posted by Piwoslaw
Looks great! I'm sure you'll notice a difference 
I have two suggestions:
- Use some reinforcement on the underside. I noticed that the center of the Kamm slightly lifts during the two times I've gone faster than 120 km/h, and tends to sag when wet snow starts to pile up.
- Make the corners a little more rounded. This will reduce any vortices that may come off of those points. |
Reinforcements and more rounded corners are already planned, also it needs to have something put to rear as sharp edge of sheetmetal is undesirable feature, but those are indeed currently what it needs + some cutting and shaping.
I had wooden Kamm last summer and even it had some reinforcements below it did start to move around 110kph.
Also it might need some braces to corners from center, below glass or opposite corners as sideways movement must be stopped too,even there probably won't be lot of it, still it would put more strain to attachment points to not have such supports. Alloy rivets are my choice of attachment as could not find anything else for that. (rivets are called pop rivets here, hard metal core and aluminium rivet, special pliers are used to attach, so it is one side job, easy to attach and relatively easy to take out too as one just needs to drill rivets out.)
I probably put also X-shape reinforcements, strips of sheet metal, 90 degree angle and drill holes + put rivets there. I could weld, but welding 0.5mm galvanized sheet metal is something I prefer not to learn at the moment, thick metal is no problem, but my welding machine is not too great with thin stuff.
Trunk lid is made from plastic, so it is not quite so strong as metal lid, but with this low weight it should handle well when I use enough rivets to share load over multiple attachment points.
Kamm is also designed so that I still can open trunk lid.