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stoffe64

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Everything posted by stoffe64

  1. yes hello...it was me who is building an afterburning turbojet out of an MACK turbocharger...the build is progressing slowly...but it progresses....best regards/stephan
  2. i love turbine engines too......perhaps it becomes so when you worked at a fighter squadron..../stephan
  3. hello chris! thank you,yes i know about some guys in australia myself, one named john wallis build qite impressive engines....even a turboprop engine and shaft powered to power one bike and one gocart.....impressive.../stephan
  4. hello again! i could sell it but it would be so expensive so i even dont dare to say for how much, because it would have to pay for the new project turbo then...and it is qite expensive/stephan
  5. hello.....you have exactly the same turbo on your B-model truck?......sell it??.....i dont know really....i dont plan to do that, what would you offer for it in that case?, i could find a bigger and better suited turbo ofcourse than this but this one is brand new and in top condition, i really really dont know,now i am confused the combustor which is made is made after measurments and calculations made on this turbo.AND it is an enormous amount of time invested which cant be counted AND alot of money invested as well...its very emotional thing this,as i said earlier if i would sell it and start over with another bigger turbo i would have restart everything with the combustor because the parts made for this engine are suited for this particular turbo....../stephan
  6. hello Rob! haha full tilt!....hmmm well, you almost have to be like a mad scientist about it, to endure all that work and testing BUT i have an enormous help in a friend(which sold the turbo to me, he is an retired gas turbine engineer, he used to work for GARRETT propulsion systems for over 40 years)there he designed and developed new types of gas turbines and nowdays he cant let go from it, he continued with gas turbines as a hobby. enormously friendly and helpful man but sometimes when he explains about gas turbines you dont understand much, 40 years around gas turbines makes that. the injectors are of a hollow cone type pattern.made by HAGO...they work the best for our hobby engines and i plan to run around 250-300 psi fuel pressure to get good atomization...better atomization means cleaner burn and more thrust and cooler running engine...hmmm axial engines?.....mmmm but then it costs a bundle of money and you have to construct everything and then i mean EVERYTHING yourself.....that includes such a critical part as the turbine with its special heat resistant alloys....very very difficult and costly......nah....i stay with ordinary turbos......one day i would want to build a turbojet out of a really BIG turbo such as the garrett gt60 high performance turbo OR small ship turbo or diesel locomotive turbo...othervise it is experimenting until it runs properly..../stephan
  7. hello Rob! ofcourse i meant hydrogen,hahaha i got a bit brainwashed there for a while......the fuel which is mostly used is propane because it is a very forgiving fuel for shortcomings in engine combustor designs etc...but many uses real jet fuel as i intend to do as well......i will start up the engine with propane first to get a pilot light...then i slowly opens jet fuel valve and the fuel enters thrue the three fuel injector nozzles that i will use...when engine runs good i close the propane valve(you can see the three marks on the top plate on one of the photos where the fuel nozzles will be placed)....and there you have it.....a miniature turbojet engine running on jet fuel....with the correct smells and everything.
  8. hello Rob! thanks for your input about turbojets.....in fact the thrust is increased on a turbojet engine with water injection because that water has to go somewhere and it goes thrue the turbine in the form of steam and oxygen...you know that water is oxygen and nitrogen....it separates here by the heat and it also allowes more fuel to be injected , more total mass flow thrue the turbine means increased thrust on a turbojet engine...the US air force used this method on the Boeing B52 stratofortress bomber and on the boeing KC 135 stratotanker to increase the thrust during liftoff from the runway. i will use the water/methanol injection at power levels above 3/4 of the throttle....the methanol adding is used to restore the turbine housing and turbine temps so it dont get thermal shock because the methanol will burn inside the engine, enough methanol will be added so the turbine temps be equal to the temps without water/methanol injection....it takes a lot of testing to get there but it can be done. bearings survive qite good on such an engine, this hobby is a very big hobby in the US and in the UK...i know one guy which has run his engine for over 300 hours....it is a matter of proper tuning, oil supply with the correct oil press (which must be higher than the compressor disharge pressure to avoid the compressor from pulling the turbine shaft against the thrust bearing,destroying it)and with good oil cooling and proper engine monitoring such as all the pressures,oil press and fuel press,the P2(compressor discharge pressure) the P4(jet pipe pressure)and the compressor discharge temp and ofcourse TIT(turbine inlet temp)and TOT(turbine outlet temp) and reading of the RPMs ofcourse to avoid overrevving of the engine(it also helps a great deal in tuning such an engine to read the RPMs when an event is happening at what RPM)and reading of the ambient temps as well is a good help, do all that monitoring then the engine survive.....i have read tons of info on this matter....thanks for your guesstimating of turbine housings, it was to great help in calculating stuff for the engine.......thanks Rob......best regards/stephan
  9. hello Rob! thanks for your info, what are the normal A/R on the turbine housing with that compressor A/R?....do you have any ideas?..i have looked all over the turbine housing without being able to find anything...you seem to know MACKs qite good.....i know about the compressors shortcomings but i have some ideas how to compensate that..its called water/methanol injection......best regards/stephan
  10. hello Barry! thanks for your help, i have found myself from the net, info here and there that the engine is also called thermodyne and that it was also used in the B61 model......that means that this turbo is a brand new turbo from the fifties sometime, i think it must be qite rare turbo in such condition, it is not a rebuilt one BUT brand new never used....would be nice to know its story how it could not be used for so many years.....thanks for your help Barry....i have even got interested in those old MACKs now...especially those B and R models....best regards/stephan
  11. hmmm...maybe possible....Barry....do you have any idea from, what mack model this turbo fits?..best regards/stephan
  12. here are some photo of special machined combustor plenum parts.../stephan
  13. hello all.....first i dont own any mack truck BUT i am the owner of a brand new garrett turbocharger model TV61, it is supposed to sit on an mack endt 673 engine, i bought this turbo with the intention to build a turbojet engine and that is my big project in life but i got a bit interested in what kind of truck this turbo would have been used......any info appreciated...best regards/stephan
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