|
|
Post by racket on Oct 26, 2011 19:37:30 GMT -5
|
|
|
|
Post by Richard OConnell on Oct 26, 2011 20:35:19 GMT -5
Thats more like it  Nicely done Racket! |
|
|
|
Post by racket on Oct 26, 2011 22:01:27 GMT -5
Hi Richard
Its a bit of a relief to finally see it produce some decent flames , ..................the only change has been reducing the P2 pressure switch that activates the A/B fuel pump , down from its initial setting of 28psi , to 18psi at previous test run and finally down to 10 psi this time .................I still can't understand why I didn't have clouds of white smoke previously , I've got it now , the only difference is the pressure point at which the fuel is admitted, ......we live and learn :-)
Cheers
John
|
|
|
|
Post by Johansson on Oct 27, 2011 0:01:27 GMT -5
Congratulations! The flame seems a bit unstable, did you run the engine at max P2? It is difficult to hear on the video but I don´t think I hear that heart-tearing noice of fingernails drawn across a black board either... ;D More fuel!! |
|
|
|
Post by racket on Oct 27, 2011 4:00:39 GMT -5
Hi Anders
Yeh , bit unstable at the higher rpm , not sure why though , ..................no screech either , but at least it lit off :-)
Cheers
John
|
|
|
|
Post by racket on Oct 31, 2011 3:25:20 GMT -5
Hi Anders
Yeh , unstable :-( .....................so I redid the maths and found I needed a bit larger jet nozzle on her, so cut 30mm off the length and opened her up by 10mm to 108mm dia .
I've given the kart to my mate Smithy , my healths not up to doing much more with her , so better she's with someone who has the energy and skills to make her "sing" ,...... she's in good hands , so stay tuned for developments :-).
Cheers
John
|
|
|
|
Post by Johansson on Oct 31, 2011 7:15:32 GMT -5
Sorry to hear that you are not feeling well John.  |
|
wolfdragon
Senior Member
Joined: April 2011
Posts: 287
|
Post by wolfdragon on Oct 31, 2011 7:42:07 GMT -5
John,
Curious about the GT6041... What are the diameters and hub on that? And since you probably know it off the top of your head... What is the jetspecs jet nozzle dia and thrust for a non AB case? Curious about just how much shaft hp one could get with that monster...
Thanks
|
|
|
|
Post by stoffe64 on Oct 31, 2011 16:28:47 GMT -5
Sorry to hear that you are not feeling well John. yeahh,im very sad to hear that too, i hope you get better real soon John  |
|
|
|
Post by racket on Oct 31, 2011 16:30:10 GMT -5
Hi Anders
Yeh , this CFS is giving me hell at the moment , only way to calm it down is to de-stress , kinda hard to do when playing with homemade turbine engines .
Cheers
John
|
|
|
|
Post by stoffe64 on Oct 31, 2011 16:36:17 GMT -5
John! you deserve a real good vacation i think,to charge your batteries sort of, go somewere and just hang around, just rest and enjoy the sun!!  |
|
|
|
Post by racket on Oct 31, 2011 16:48:05 GMT -5
Hi Wolf
The GT6041 has a 141 mm dia comp with a ~106mm inducer , hub ~30mm , very strong unit with its boreless comp , can be "flogged" rather hard ......................"dry" thrust is a tad under 150 lbs from an 88mm dia jet nozzle and probably capable of 175 shp with a suitable freepower turbine attached , maybe even a tad more with extra mods , ~200 shp would/could be its upper limit .
Its a big turbo flowing 75% of the air that an Allison C20 heli engine does ( 3.6 lbs/sec) , and they turn out >400 shp from their ~7:1 pressure ratio engine , we're talking serious flow rates thru the 6041 at 2.75 lbs/sec , ~2,200 CFM going in , ~7,600 CFM of hot gas coming out , shes a bit scary to be close to with that compressor wheel needing ~300 hp to spin it at 70,000 rpm
Cheers
John
|
|
smithy
Member
Joined: August 2010
Posts: 31
|
Post by smithy on Oct 31, 2011 18:41:26 GMT -5
Hey Guys,
As you all know, John has given the GT6041 powered "afterburning" kart to myself to "finish-off"...although 99.999% of the work has been done by John....and may I say, what a beautiful job it is, seeing it in person makes me really appreciate John's skills and inginuity. I wish to publicly thank John, he's one of those "real friends" one meets only once or twice in a lifetime.
I have reasonable access to a drag strip and hopefully the "Green Beast" will see the track soon and I hope to be able to update you all as to progress etc..
Cheers and thanks once again to John (Rackets).
Smithy.
|
|
|
|
Post by pitciblackscotland on Oct 31, 2011 21:55:05 GMT -5
Hi Smithy,
That's great that you can finish off John W jet kart. All the best with the progress.
Cheers,
Mark..
|
|
|
|
Post by Richard OConnell on Oct 31, 2011 22:12:40 GMT -5
Sorry to hear about that John.. I hope you get better soon And best of luck with the kart smithy. I'm sure you'll make john proud. |
|
Nicely done Racket!
