GOG makes another offensive tweet, offers non-apology | Sds Hammer Drill Bit

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There is a disconnect between fire officers who are primarily involved in firefighting and emergency medical services (EMS) and officers in fire prevention, whose job it is to inspect building fire protection systems. A consequence of this disconnect is that fire suppression officers tend to know very little about the design and function of building systems, such as heating, ventilation, and air-conditioning (HVAC), smoke control, and alarm systems; sprinklers; and standpipes. This article examines the reasons fire officers in Operations, those responding to emergency calls, must have a thorough knowledge of building systems. It also examines ways fire departments can gain the knowledge to train their personnel by reaching out to their Fire Prevention Bureau, Building Department, and fire protection system contractors.

No, the only similarity between it and a wankel are that it is a rotary engine. The Gotek Dynakinetic engine has rotating end caps which create the ‘cylinder’ walls, greatly reducing seal wear. A Wankel rotor side seal swept the entire sidewall but here the flap side seals need only sweep the distance of travel, which is quite small at the hinged end and even slightly less than a standard piston engine at the other end.

1. See “Massive Fire Destroys New Jersey Lightweight Wood-Frame Apartment Buildings.” Thomas Jacobson, Patrick Chevalier, and Thomas Quinton Sr. Fire Engineering, January 2016.

It’s a big stretch from a transmission ECU / spool valve controller.. The engine valves are quite massive in comparison to the spool valves in a cars transmission, and must move much, much faster many more times. (3600 RPM’s = 30 valve cycles per second) Your transmission averages a few cycles per minute.. In addition forces are much, much larger than in a fluid control valve. There is a reason why engine valve springs are so massive – you need a lot of pressure to hold them closed. Cylinder pressure in a heavily loaded engine can exceed 1000 PSI. If your valves are not held tightly closed the escaping gasses act like a blow-torch and cut groves in to the valves, “burning” them. In addition, if you really want to make the engine run to its full potential, you need to vary the valve lift profile, you cant just “bang-bang” open-close the valves. That wont work. That’s why you see VVT-LI engines, variable valve timing and lift height control. The idea is that you are trying to maximize the velocity of the airflow in the intake manifold suck that you get a “hammer head” effect that squeezes more air into the cylinder – and just before the “squeeze” air starts to reverse direction across the valve, you want to close it shut. What complicates this is that the piston’s velocity is constantly changing, (in a sinusoidal manner) so you need to change the valve profile in a manner that is non-linear if you want to achieve laminar airflow at high velocity.

The original trigger for this high power PVC air cannon used a simple ball valve for the trigger. [Ben] didn’t like this solution – it was hard to open and somewhat unergonomic. The ball valve trigger has since been replaced with a valve from a sprinkler system, giving this high power PVC air cannon a fancy brass trigger. It looks awesome, and can kill a watermelon from twenty yards. What more could you want in a high power PVC air cannon?

Um… cars already have electronics. It’s not any more or any less reliable to electronically control valve position.

Doesn’t this neglect sealing of the valves? This now has to done with a sliding valve across an inlet, rather than two surfaces (valve and seat) simply sitting on each other to seal. There might be other reasons why this hasn’t taken off, though.

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I have only good things to say about these bits. They exceeded my expectations and are now the ones I use for fast, burr-free drilling.

When they overcame injuries to win the 2018 NCAA title, the Irish were a story of perseverance. If they win in 2019, it will be a story of dominance.

The German team of Tobias Wendl and Tobias Arlt won the doubles race, with fellow Germans Toni Eggert and Sascha Benecken taking second. Latvia took the bronze there, with Andris Sics and Juris Sics finishing about one-third of a second off the winning time.