Being a licensed professional structural engineer in two states i have designed and checked designs of many trusses. To really do it right you have to determine the design loading, PSF and any concentrated loads on he roof. Many designs are under designed and many over designed. You have to know the allowable stresses on the wood grade and species being utilized.
That being said, many trusses are home built for small buildings with non living spaces that work fine for most of the time and if a collapse does happen it is not too serious. Many people with a good feel for working with timber can fabricate a decent truss that will work.
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Today's Featured Article - Oliver 550 Purchaser Checklist - by Greg Sheppard. Pound for pound the 550 is better than anything I've seen. It has great power for its size and can really hunker down and lug. Classified as a 3-bottom plow depending on soil conditions. I personally don't think it can be beat for a utility tractor in the 40 HP range. They are extremely thrifty on fuel, at least my DSL is. Most drive train parts are fairly easy to get. Sheet metal is probably the hardest thing to
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