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Any inductance will in fact limit the rate of charge to the capacitor. And, using the following formula's you can determine the inductance required to achieve the desired charge time. However, I do believe you will find the inductance to be much larger than you expected. I=c(dv/dt) Plug in...

Well guys, I have an update.... I am quite pleased because I found a glulam that was purchased for a home, then the design changed and they had to purchase another beam. The beam has never been installed and is in great shape. I spoke with the engineer, he approved it. This is a pressure...

masa, As far as switching devices that are capable of being pulsed and 100% duty cycle, have you checked into IGBT's? look at Semikron.com As far a soft start for the buss. Have you considered a permanent soft start? Quite simply high wattage resistors across the buss fet. You would need to...

I appreciate everyone's feedback. I will be biting the bullet and purchasing the glulam recommended. You have all given me reassurance that the engineer I hired in fact knows what is best. Thank you everyone.

Ron, I know in the old days, builders used to make laminated beams using pieces of 2x that were shorter than the span. The joints of each piece had to be staggered and plywood sheeting ripped to the beam width was used in between the 2x's. This would all be glued together and bolted as needed...

If I'm understanding the terminology correctly: Continuous span would be a case where a single beam is supported at both ends and in one or more locations between the ends. right? So, are you saying a glue lam is better used with ONLY supports at both ends, rather than multiple supports?

Well, you guys have given me exactly what I needed.... assurance that the engineer is not over-designing the roof support. There is nothing wrong with the beam, other than cost. And cost IS my driving factor to look at other options. I am also satisfied with the engineer that I hired, other...

I am building a new structure. This is a Pole Barn style frame, but it will contain living quarters inside. It is a 30' x 64' building with 16' high walls. 4.5:12 pitch roof. On one end, I desire a 20' long open room that is the entire height of the building. I also want vaulted ceilings in this...