I seem to recall that the minimum airspeed for halfway reasonable efficiency with a ramjet is about 400 mph. Hiller once experimented with a small helicopter powered by ramjets on the rotor tips. I don't recall any mention of starting problems but I doubt it was easy.
I believe that a fuel adaptable to forming a reasonably fine mist is needed for ramjets and gas turbines. Kerosene works and I believe the Germans used diesel fuel during the war. Doug Woodard St. Catharines, Ontario, Canada On Thu, 1 Sep 2005, Manzo, Emil wrote: > Hi Joe, for no (very few) moving parts you need a ram-jet. Or as some > used to call a "scram jet". It is essentially a pipe with a venturi and > a fuel injector. It needs to have air flowing through it before > ignition, like if it was attached to a glider or vehicle. Once enough > airspeed flows, the injector is activated and the fuel ignited producing > thrust. I bet WVO would work for fuel :-). Another one of my > hair-brained dreams.... > > > > Regards, > > Emil > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Joe Street > Sent: Wednesday, August 31, 2005 4:03 PM > To: Biofuel@sustainablelists.org > Subject: Re: [Biofuel] Cross Posted: Fwd: [DIYGasTurbines] Re: I'd like > to try something...but first, your opinions (please). > > > > Yes but as for sustainability tell me how long do these things run for > at 60 and 70,000RPM and how often do you have to repair them?? > > Joe > > Michael Redler wrote: > > > > "You have to have deep pockets to play with those things." > > > > Not necessarily. I joined [EMAIL PROTECTED] a few weeks ago > after learning that you can get everything you need from a junk yard. > People are buying auto turbochargers and back feeding the compressor > gasses to the exhaust turbine and adding some fuel and an igniter (spark > plug). > > > > http://www.junkyardjet.com/ <http://www.junkyardjet.com/> > > > > I'm just having trouble collecting data on efficiency for this > technique. > > > > Mike > > > Joe Street <[EMAIL PROTECTED]> > <mailto:[EMAIL PROTECTED]> wrote: > > Hi Emil; > > I should have said that is not my page. I haven't built a > conventional type pulsejet. I just pulled the link from my bookmarks > FYI. > I am more interested in the coanda effect and the ferroelectric > effect. The problem wih turbines is they are not very sustainable. You > have to have deep pockets to play with those things. I want something > with no moving parts. (other than phonons :-) ) > Just wanted to let you know there are surplus turbines available > out there. > > Good luck > Joe > > Manzo, Emil wrote: > > > > Hi Joe. When you said Pulse-jet you reminded me of something I > saw when I was a kid. It was a small jet turbine that bolted onto your > car's differential. It bolted in place of the rear differential cover > and connected to your fuel and electrical system. As the car ran down > the highway, the turbine came up to speed and you could flip a switch > and inject fuel into it for a boost. Primitive but effective. I bet one > of these would run well on biodiesel. > > Your pulse-jets are fabulous. At first I thought they were > "scram-jets" but then saw the turbine. Cool. How much to they cost? > > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Joe Street > Sent: Wednesday, August 31, 2005 1:39 PM > To: Biofuel@sustainablelists.org > Subject: Re: [Biofuel] Cross Posted: Fwd: [DIYGasTurbines] Re: > I'd like to try something...but first, your opinions (please). > > > > This is not at all far fetched. Several people are bulding teir > own turbines and other things like pulsejet engines etc. However you > can get surplus APU's (auxiliary power units) at bargain prices if you > look around. Check here: > http://freespace.virgin.net/dyno.power/gasturbine/ > > Fun stuff! Pulse jets are not just for the military anymore! > There is even a guy talking about building his own personal cruise > missile. =-O Talk about civil disobedience! > > Joe > > Michael Redler wrote: > > I've been researching the feasibility of building a biofuel > turbojet engine. > > > > Apparently, it's not as far fetched as one might think. I'm > still unsure of thermal efficiency and if it's competitive with other > cycles. In theory, it should be. > > > > Has anyone done similar research? > > > > Mike > > > > > > _____ > > > > > _______________________________________________ > Biofuel mailing list > Biofuel@sustainablelists.org > http://sustainablelists.org/mailman/listinfo/biofuel_sustainablelists.or > g > > Biofuel at Journey to Forever: > http://journeytoforever.org/biofuel.html > > Search the combined Biofuel and Biofuels-biz list archives (50,000 > messages): > http://www.mail-archive.com/biofuel@sustainablelists.org/ > > > _______________________________________________ Biofuel mailing list Biofuel@sustainablelists.org http://sustainablelists.org/mailman/listinfo/biofuel_sustainablelists.org Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Search the combined Biofuel and Biofuels-biz list archives (50,000 messages): http://www.mail-archive.com/biofuel@sustainablelists.org/
