I try to figure out some parameters to minimize production of junk protos
My molds are overengineered to compensate springback. This works perfectly with glasfibre.
With carbon fibre you can guess, the skis come out of the mold with almost no springback, so i get way to much camber, tip & tail.
I did make some notes long time ago, think this was twizz:
Montucky did state:Yes. Heat from the bottom in a flat mold, and you will get more camber. Heat from the top, and you'll get reverse camber (or lose camber with a cambered mold).
If you have top and bottom heat blankets, setting the bottom one hotter will increase camber, and vice versa. The greater the delta between the two temperatures, the more effective it will be.
That might make sense but then why do my carbon skis have twice the camber as my glass skis. I have to cook top heavy by 25 degrees f to get normal camber in my carbons.
So far so clear. What puzzles me is the fact that imho it doesnt make sense to just heat up one side more then the other. Key should be to reach glas temp first on the top to get lesser camber. I think the final temp should be the same, just the ramp timing should be offset.
Am i right?
If so, how far should the bottom mat timing lag behind the top mat?
Timing = 25 degrees f = offset?
So if i reach 195 degrees f on top the temperature on bottom needs to be ramped up so i have just 170 degrees f at the same time.
Ramp down in the same manner or should i hold top temp till the bottom is finished?