Force and Tension: The 12.2 meter Crain weighs 18 kN and is holding 67 kN load at rest above the ground?
lift the self weight of the crane, summing moments about the pivot point assuming T0 is from the self weight T0 x L L/2 x 18k T0 9k, now add the item weight, T1 9k +67k the tension goes thru the hinge (the sheave) at the top of the crane and is pulled at the 45 degree angleThe tension is the same in this hoisting cable now the pendant line is resisting this the force and equal to this angle at 40 degrees horizontal.
Depending on the size of the gap around the windows, I will use foam, battens, or bothAs someone has already mentioned, the idea is to trap the airSo, you want to seal around the windowsYou can do this from outside by applying a bead of caulk when the windows are installed - this also helps seal the window frame from wet weather (I always caulk in my window frames) For very large areas, I will run a bead of foam around the inside to help seal it again, to keep wind from blowing through, and finish up the space with battensI dont attempt to fill the whole space with just foamThis seems to me, to be the most cost effective solution, as you get the benefit of both products, with minimal costsay one can of foam, as opposed to several, heheheFor very small areas, I will just use the straw on the foam can, to help seal the area - as I normally use the foam anyway to seal the exterior side of the gap, I just go ahead and fill in any really small placesOne word of caution to those who havent thought about itdo not use EXPANDING foam around windows, as the expansion can put them in a bind, and make the windows stick, heheheInstead use a product like DAP makes which expands 75% immediatelynot GreatStuff, which continues to expand over time(The DAP white foam also cleans up with water - GreatStuff, you have to wear off, lol) Congrats on the new windows
Expanding foam is bestWill insulate better and at 5 bucks a can you will make up for in energy savingsThe thing is that you have to be prepaired to use the whole can because it will clog up and be no good.
Depending on your climate, 1/4 inch isn't muchMany new houses have much more than that much space in construction errorsWhile you have the opportunity, it wouldn't hurt to insulate this area, thoughUsing scrap pieces of fiberglass would be a wasteYou'd have to stuff it into the crack and this reduces its insulating valueThe most effective was to insulate this area would be to use an aerosol product such as Great Stuff, found at any hardware or home improvement storeIt's fun to watch it work, but be careful that you don't use too muchIt expands to fill a void a lot more than you may think.
