On 29 June 2014 18:38:11 CEST, Dale <rdalek1...@gmail.com> wrote: >Peter Humphrey wrote: >> Of course! I missed the Spitfire, so I don't know how high it flew, >but the >> Hurricane sound from no more than a couple of hundred feet or so was >among the >> two or three most impressive of my life. Both planes have V12 >Rolls-Royce >> Merlin engines (I think). As each cylinder fired, the sound pressure >went up >> extremely fast at the start of the exhaust beat, suggesting huge >exhaust >> valves, and the deep-throated roar was ... just ... beyond >description. >> >> The only engine to come close was an extraordinary 1/3 scale model of >a nine- >> cylinder radial aero-engine I saw years ago at a national model >engineering >> exhibition. The crankshaft was anchored to the frame, and the entire >engine >> and prop rotated around it. That's what you call air-cooling! >Absolutely >> fantastic when he fired it up once an hour or so! > >Yep. Some of those prop engines are very powerful, maybe not so >efficient tho. Anyway, they sure do make some noise even if the engine >is small. I don't think they have mufflers or if they do, it isn't >much >of one. I also think they burn methanol or something too. I'm not >sure >and it may even vary from one engine to another. I don't think they >burn plain old gas like cars.
If you are talking about model engines. The bigger ones run normal petrol, just like cars, lawn mowers, chain saws,..... >>> I live about 4 or 5 miles from a air force base here. We have >mostly >>> training type planes that fly over us but on occasion, we have >something >>> really big here. We have even had the space shuttle land there a >few times. >>> The B2 bombers have been there as well. >> Sounds like a good place to live! That's not Edwards, is it? I drove >up to the >> gates once to see what they'd say. They were actually quite polite. > >I'm close to Columbus Air Force base in Mississippi. It has a huge >runway. It is one reason the space shuttle lands here. It takes a >long >runway to land and take off when carrying that thing. I say space >shuttle, it's mounted on the back of a 747 I think. What's more neat >tho is the big bombers. My Dad several decades ago was doing a >contract >job at the base. For some reason they had the really big bombers out >there with armed military guards everywhere. They wouldn't let anyone >even near those things. He could see them real good tho. He said "it >looked like death, just plain death". Later on my Dad found out it was >loaded up with bombs that they were moving somewhere else. Death was >more accurate than he thought. > > >> >>> I have heard some of the large planes when they start their engines >and >>> like I said, I'm several miles away and it is loud. Video just >can't >>> give you that even with a good sub-woofer. >> Even that wouldn't help much, I think. You'd need something that can >handle an >> extremely rapid wave-front and high volumes. As you said - you had to >be >> there. > >Yep, speakers can only do so much. > > >> >>> Thanks for the link. >> My pleasure. I don't know when we'll get the Hurricane one - the man >with the >> camera just put a two-word entry on Twitter this morning: "Hashtag >HEADACHE" >> > > >Oooops. > >Dale > >:-) :-) -- Sent from my Android device with K-9 Mail. Please excuse my brevity.
