gidge348
Senior Member
Joined: September 2010
Posts: 426 
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Post by gidge348 on Mar 4, 2015 20:45:20 GMT -5
Hi Smithy, I saw on Anders's page you mentioned that you were not sure if there was a class to run your kart at Lake Gairdner. Well in a nut shell yes, it is the Gas turbine under 500kg class and there is no Australian record for that at the moment, so just turning up and running may get you a Australian Record  The only issue that caused some confusion with the last kart that ran is, is it inspected as a car (4 wheels, roll cage, safety belts etc) or as a Bike (2 wheels, leathers etc). Then there is 10 miles of the best salt in the world. But I am sure that Bob the chief examiner can help with that. All the details here www.dlra.org.au/index.htm. Next event is 23-27 of this month if you can afford a couple of days may be worth packing a tent and making the trip. A word of warning though a lot of people that first set foot on the salt end up with "Salt Fever" and that is a really hard habit to break Cheers Ian |
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Post by racket on Mar 4, 2015 21:06:24 GMT -5
Hi Smithy
If you leave the A/B nozzle as is theres the possibility of not getting full power before your TOT limit is reached, but you shouldn't run into surge problems .
But I'd certainly be cranking up the P2 pressure a tad , something closer to 40 psi wouldn't be a problem , this should get your TOTs up a bit , but you'll still be needing to increase those A/B fuel flow rates to get the TOT up to 750 C , that Inco turb wheel can take it
Maybe a bit of "car park" road testing next Wednesday ;-)
Cheers
John
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Post by racket on Mar 4, 2015 21:08:22 GMT -5
Hi Ian
LOL, my old TV84 based bike could have set the record a decade ago, heh heh , as it is I guess it holds the unofficial one ;-)
Cheers
John
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Post by smithy1 on Mar 4, 2015 21:17:47 GMT -5
Hi Smithy, I saw on Anders's page you mentioned that you were not sure if there was a class to run your kart at Lake Gairdner. Well in a nut shell yes, it is the Gas turbine under 500kg class and there is no Australian record for that at the moment, so just turning up and running may get you a Australian Record The only issue that caused some confusion with the last kart that ran is, is it inspected as a car (4 wheels, roll cage, safety belts etc) or as a Bike (2 wheels, leathers etc). Then there is 10 miles of the best salt in the world. But I am sure that Bob the chief examiner can help with that. All the details here www.dlra.org.au/index.htm. Next event is 23-27 of this month if you can afford a couple of days may be worth packing a tent and making the trip. A word of warning though a lot of people that first set foot on the salt end up with "Salt Fever" and that is a really hard habit to break Cheers Ian Hi Ian, Thanks a bunch for that....Never been to the Aussie Speed week.....I've been threatening to get to Lake Gardiner for yonks, even if it was just to watch the other vehicles...I have a car show in Melbourne at the end of this month so I'm not likely to get to Lake Gardiner this year.....but next year may be an option....I'll see if the missus is interested enough to go for a road trip to South Aus. Maybe we could even get a group of Aussie JATO members to rock up..!?? Edit: I just had a look at the "rules" for turbine powered vehicles and it specifies they must be wheel driven...  Cheers, Smithy. |
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Post by smithy1 on Mar 4, 2015 21:22:57 GMT -5
Hi Smithy If you leave the A/B nozzle as is theres the possibility of not getting full power before your TOT limit is reached, but you shouldn't run into surge problems . But I'd certainly be cranking up the P2 pressure a tad , something closer to 40 psi wouldn't be a problem , this should get your TOTs up a bit , but you'll still be needing to increase those A/B fuel flow rates to get the TOT up to 750 C , that Inco turb wheel can take it Maybe a bit of "car park" road testing next Wednesday ;-) Cheers John Thanks John, I'll open her up a tad and reset the P2 maximum and give her a run....can't hurt to try..! I've got plenty of room to play for extra A/B fuel too... Cheers, Smithy. |
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gidge348
Senior Member
Joined: September 2010
Posts: 426
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Post by gidge348 on Mar 5, 2015 3:29:20 GMT -5
Edit: I just had a look at the "rules" for turbine powered vehicles and it specifies they must be wheel driven... OOOOHHHHH Bugga sorry about that, maybe just hang a FPT on the back and all will be good.... |
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Post by racket on Mar 5, 2015 15:30:16 GMT -5
Hi Ian
LOL, maybe bleed off a tad of exhaust gases, pre A/B, to a "freepower" mounted directly onto the kart axle , the after burn is just for "effect" ;-)
Cheers
John
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Post by smithy1 on Mar 5, 2015 19:42:49 GMT -5
Hi Ian LOL, maybe bleed off a tad of exhaust gases, pre A/B, to a "freepower" mounted directly onto the kart axle , the after burn is just for "effect" ;-) Cheers John We can do that...and have a "freewheel" bearing in the system so we won't be hampered by rpm limits should the A/B system wish to drive the kart faster than the free turbine is capable. Or... Run an electric motor to get off the line and de-couple it once up to a decent speed...then let the thrust take over..! "What are you talking about Mr. Official....it is wheel driven!!" ......for a short distance anyway.  |
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Post by smithy1 on Mar 13, 2015 2:32:39 GMT -5
As mentioned in Jeff's thread, I've done a few "slow" road test runs over the last few weeks, maybe a max of 100kmh or so. I removed a small amount from the tailpipe, (is now ~110mm dia), to allow it to breath a little easier, seemed to work ok and the A/B now lights off a bit better too. A few other small mods have been carried out, such as fitting of an igniter and supplementary fuel injectors in the back half of the tailpipe. I've fitted a new oil cooler assembly and oil temp guage....after three goodly runs back to back the oil temp never exceeded 85C ...so all good there. As time goes by I'll slowly increase the amount of fuel going into the A/B and monitor EGT's etc... www.youtube.com/watch?v=i1bVaRoXc0E In the above video I was only running at ~25psi P2 maximum....was just starting to make some serious thrust...but I was running out of room so thought I should back off rather than become a smear on the road. I think with enough room she'll have a pretty healthy top-end speed. I'm guessing something approaching 150kmh or possibly more  ....time will tell. |
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Post by pitciblackscotland on Mar 13, 2015 3:04:23 GMT -5
Hi Brett, Bloody hell!! 100kmh Nice LOL are you man enough to go 150kmh plus on this kart?  ? Would you have any idea on how much this thing weigh?? Cheers, Mark.. |
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Post by smithy1 on Mar 13, 2015 3:16:38 GMT -5
Hi Brett, Bloody hell!! 100kmh Nice LOL are you man enough to go 150kmh plus on this kart? ? Would you have any idea on how much this thing weigh?? Cheers, Mark.. 150kmh isn't that much to be honest....not even 100mph..! The kart is fine and plenty strong enough....has, brand new wheels & tyres all round, new rear axle bearings.... front and rear brakes too, which seem to work well thus far. As far as weight goes....I'm only guessing but I suspect it would be close to 150-160kg or so...plus my fat ar$e. Cheers, Smithy. |
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Post by racket on Mar 13, 2015 4:19:12 GMT -5
Hi Smithy You might get a bit more than 150 kph with the A/B on full song :-) Heh heh , remember these calcs I did...................... The 80cc gearboxed Kart Class , (which the kart was originally built for, it came with a "bored out" 110cc engine) now runs engines turning out powers of 28 hp and doing speeds up to 190 kph -118mph - 173 ft/sec , Now Horsepower is equal to ........... resistance (drag) X feet per second --------------------------------------------- 550 so 28 hp X 550 divided by 173 ft/sec , this comes out at ~89 pounds of "resistance" at terminal velocity , or in other words, it'll only need 89 pounds of "tire to road thrust" to achieve this terminal velocity , no wonder my old freepowered kart with 160 lbs of static drawbar "thrust" was still accelerating like mad at 120kph-75mph when I had to lift the throttle on that rough bit of road I was using for a test track Now the International Superkart Class with twin cylinder 250cc engines running 90 hp are getting around 260kph - 161mph - 236 ft/sec so, 90 hp X 550 divided by 236 = 209 lbs of resistance/drag ..................heh heh , this is just about what the Green Beast should produce with A/B at full song Acceleration will naturally be much slower than the IC engined kart with its gearbox , but terminal velocity should be the same. Power required goes up at the cube of the speed , 161mph divided by 118mph = 1.36 , ...............1.36 X 1.36 X 1.36 = 2.51 ..............2.51 X 89 lbs of thrust = 223 lbs for the higher speed , mmm , only 7% off the 209 lbs calculated theoretically ..................close enough allowing for "class differences" . There shouldn't be a large deviation from "normal" kart frontal area/drag coefficient , so even allowing a 20% buffer for unknowns, its potentially got a fairly high top speed with a sufficient length of tarmac to wind her out Cheers John |
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Post by pitciblackscotland on Mar 13, 2015 4:26:14 GMT -5
Hi Brett, Ok thanks for that info good luck with your test runs. LOL i think my turbine mower will weigh a lot more than your kart the big T30 weigh 47kgs then the IC engine ect,ect and my 6 foot 3 frame. Oh and one disc brake to stop the thing. maybe I'll stick to driving it on the footy oval or the golf course Cheers, Mark. |
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Post by smithy1 on Mar 13, 2015 14:52:29 GMT -5
Thanks John, Yes I remember the calcs....was just being a bit "conservative" ...I'd be more than happy to see 200-220kmh TBH..! Mark...The big 6041 has a goodly amount of weight to it but the rest of the kart is quite light...I can pick the front up quite easily with just two fingers..! Cheers, Smithy. |
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Post by racket on Mar 13, 2015 19:01:32 GMT -5
Hi Smithy LOL,............ below that conservative nature of yours, there lurks a risk taker, one of these days you'll post a video that will blow us away  Cheers John |
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The only issue that caused some confusion with the last kart that ran is, is it inspected as a car (4 wheels, roll cage, safety belts etc) or as a Bike (2 wheels, leathers etc). Then there is 10 miles of the best salt in the world. But I am sure that Bob the chief examiner can help with that.
....time will tell. 
? Would you have any idea on how much this thing weigh??