Moderator: Mike Everman
Eric wrote:If you stand at a 45 degree angle to the intake you are hit with so much sound energy that you can actually feel the air in your lungs compressing and expanding giving you a very very unpleasant buzzing feeling, as well as being so much vibrational energy transfered to your body that you cant stand at that spot at all. When you have your mouth open as you are breathing you get this weird sensation from the air rapidly flowing in and out. As soon as I discovered that spot I imediately ran away, and only breifly investigated this at farther distances. At any distance at the 45 degree line there is so much more force its mind boggling. You have to stand 15 feet away at the 45 degree line there is still at least 10 times more "sound" as standing 3 feet directly behind the engine which is quite a task on slipery snow.
Larry Cottrill wrote:Here's another interesting thought: We could make such an engine almost quiet if (a) all the noise were confined to a rearward direction; (b) the intake noise were directed rearward through a duct whose internal gas temperature could somehow be adjusted; (c) the wave exit openings of the duct and the tailpipe were extremely close together; and (d) if the temperature of the duct could be adjusted so that the trough of the wave exiting it were precisely synchronized with the crest of the wave from the tailpipe. If we had sine waves of equal amplitude, the engine could be rendered completely silent. It also probably wouldn't run, due to pressure wave nullification!
Avoid the stress of strong pulsejet vibration. You are almost certainly tired due to the pummeling your body is receiving. Big pulsejets crumble masonry. You may have microscopic internal bleeding that manifests itself as tiredness because it is not located in any single spot but at many places inside your body.
I am not joking. Truly strong noise does bad things to your body.
Mike Everman wrote:Bruno,
I'm not so sure it's that easy to make two engines perfectly the same, nor do I think that the crossover tubes and such really get them all the way out of phase if they are made the same frequency. I'm pretty sure now that they truly want to get IN phase with each other.
Mike Everman wrote:I think the failing of the early attempts were that the engines need to be designed to run tandem, and tandem only. Think about how the ambient conditions change when they are run out of phase! The geometry needs to change, IMHO, and I do believe you'll get that supercharging you want.
Mike Everman wrote:I have two experiments coming up which will shed some light on this subject, which you know is very dear to me. All my wee hours have been spent on this particular subject for the last few weeks, and I'm almost ready to try. For some reason, I want to present the results more than the theory, so bear with me. It's helping me actually DO IT, instead of talk about it! I don't want to present the idea half baked.
Users browsing this forum: No registered users and 1 guest