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Post by racket on Jun 20, 2018 17:58:01 GMT -5
Yeh , that ST50 engine was a nice piece of work , if I remember correctly it was built by a guy a fair while back when he was Member of the Yahoo Group .
But if you can do that amount of work then you may as well make an entire engine which will be a lot more compact , that ST50 ended up pretty long .
Heh heh , yep you'll be making plenty of compromises before the job is done :-)
Cheers John
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Post by azwood on Jun 20, 2018 22:13:19 GMT -5
Is it possible to make a flame tube say 300mm long if the diameter can be bigger think i might need to have something much shorter
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Post by racket on Jun 21, 2018 1:21:14 GMT -5
Yep , its possible , Anders and my flametubes are only ~100 mm long . The Jetspecs programme produces a very flexible flametube that can cope with poor fuel and air delivery, with a bit more sophistication in those areas the length can be reduced considerably especially if you're not trying for the absolute best fuel efficiency . With the turbo scroll as part of the dilution zone we really only need to concentrate on producing a short Primary Zone , we can "eliminate??" most of the Secondary Zone length as its function is to finish off any stray bits of combustible material in the interests of good fuel efficiency. Probably the shortest setup is with evap tubes where their discharge is right up at the top of the flametube getting combustion started early , a spray nozzle "wastes" some distance . The main body of my GT6041 flametube jetandturbineowners.proboards.com/thread/78/garrett-gt6041-powered-kart?page=3 jetandturbineowners.proboards.com/attachment/download/177 was pretty short considering its diameter , there was a longish "funnel" but that allowed a nice plenum for the air entering the combustor to spread out . Cheers John
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Post by azwood on Jun 21, 2018 3:57:42 GMT -5
Yep , its possible , Anders and my flametubes are only ~100 mm long . The Jetspecs programme produces a very flexible flametube that can cope with poor fuel and air delivery, with a bit more sophistication in those areas the length can be reduced considerably especially if you're not trying for the absolute best fuel efficiency . With the turbo scroll as part of the dilution zone we really only need to concentrate on producing a short Primary Zone , we can "eliminate??" most of the Secondary Zone length as its function is to finish off any stray bits of combustible material in the interests of good fuel efficiency. Probably the shortest setup is with evap tubes where their discharge is right up at the top of the flametube getting combustion started early , a spray nozzle "wastes" some distance . The main body of my GT6041 flametube jetandturbineowners.proboards.com/thread/78/garrett-gt6041-powered-kart?page=3 jetandturbineowners.proboards.com/attachment/download/177 was pretty short considering its diameter , there was a longish "funnel" but that allowed a nice plenum for the air entering the combustor to spread out . Cheers John Unfortunately i think relly i need to make a new one to fit in this bike otherwise i wont be avle to reach the handlebars i can tilt it on its side a bit if need be
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Post by racket on Jun 21, 2018 4:17:30 GMT -5
Yeh , I had to have my gas generator at an "angle" , the combustor sticking out to the side , it can be done ...............have a look at my run vid for some ideas of placement www.youtube.com/watch?v=eUtDSjVZCUQ
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Post by azwood on Jun 21, 2018 4:24:15 GMT -5
Yep thats pretty much what i imagine ill need to do.keen to see how this bike goes its very lightweight with the spun alloy wheels and fiberglass bodywork need to find some 18in tyers for it to do land speed raceing Yeh , I had to have my gas generator at an "angle" , the combustor sticking out to the side , it can be done ...............have a look at my run vid for some ideas of placement www.youtube.com/watch?v=eUtDSjVZCUQ
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Post by azwood on Jun 21, 2018 4:31:07 GMT -5
The only real weight is the moter thats in it
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Post by racket on Jun 21, 2018 4:41:12 GMT -5
Yes , keep the weight down , my old bike weighed in at ~280 kgs , it was a proof of concept machine with no attempts made to keep weight under control or any concerns about "frontal area" , shes about as streamlined as a house brick , and with me flapping in the breeze , the engine had to work hard ..............LOL, it was fun just then watching the couple of short old vids at the end , that was probably the worlds first ride of a DIY turbine powered bike ...........it seems so long ago now ...........it was one crude machine, but then I didn't even know if it'd even move under its own shaft power..........heh heh , there was nobody to ask as it hadn't been done before :-)
Andrews bike weighs about half what the TV84 one did , about what a dirt bike weighs , and its "skinny" for good speed .
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Post by azwood on Jun 21, 2018 5:01:35 GMT -5
Honestly if i can get 200/220kmh out of this engine ill be happy.i can improve on that as i learn more Yes , keep the weight down , my old bike weighed in at ~280 kgs , it was a proof of concept machine with no attempts made to keep weight under control or any concerns about "frontal area" , shes about as streamlined as a house brick , and with me flapping in the breeze , the engine had to work hard ..............LOL, it was fun just then watching the couple of short old vids at the end , that was probably the worlds first ride of a DIY turbine powered bike ...........it seems so long ago now ...........it was one crude machine, but then I didn't even know if it'd even move under its own shaft power..........heh heh , there was nobody to ask as it hadn't been done before :-) Andrews bike weighs about half what the TV84 one did , about what a dirt bike weighs , and its "skinny" for good speed .
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Post by azwood on Jun 21, 2018 5:04:27 GMT -5
Honestly if i can get 200/220kmh out of this engine ill be happy.i can improve on that as i learn more Yes , keep the weight down , my old bike weighed in at ~280 kgs , it was a proof of concept machine with no attempts made to keep weight under control or any concerns about "frontal area" , shes about as streamlined as a house brick , and with me flapping in the breeze , the engine had to work hard ..............LOL, it was fun just then watching the couple of short old vids at the end , that was probably the worlds first ride of a DIY turbine powered bike ...........it seems so long ago now ...........it was one crude machine, but then I didn't even know if it'd even move under its own shaft power..........heh heh , there was nobody to ask as it hadn't been done before :-) Andrews bike weighs about half what the TV84 one did , about what a dirt bike weighs , and its "skinny" for good speed . Hoursepower isent everything thairs 100cc bikes that are fast on the salt.streamlineing has a lot to do with it
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Post by racket on Jun 21, 2018 17:46:38 GMT -5
You should be able to get those speeds with your engine if you keep the frontal area under control
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Post by azwood on Jun 21, 2018 19:38:27 GMT -5
I try to keep my frontal under controle lol You should be able to get those speeds with your engine if you keep the frontal area under control
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Post by azwood on Jun 23, 2018 23:15:01 GMT -5
Well it will fit but defently need to rethink the flame tube design i still like the st50 setup as i have a lot of room lengthwise
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Post by azwood on Jun 23, 2018 23:16:23 GMT -5
I can remodel the rear frame tubes to make room for the power wheel easily
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Post by azwood on Jun 24, 2018 5:20:38 GMT -5
I have 300mm space on diamitor and 270mm in lenth to make the chamber as long as this is enough space id like to do it that way to keep the frontal surface as slim as possible i can go longer on the lenth if i need.
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