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Post by pitciblackscotland on Jul 18, 2011 5:25:39 GMT -5
Hi John, The kart is looking good  . Love the shingle over the shed door. Cheers, Mark.. |
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Post by racket on Jul 18, 2011 15:28:17 GMT -5
Hi Mark
LOL..............yeh , probably know enough by now to throw the shingle out and start advertising for customers ;-)
The "to do" list for the kart is getting smaller .
Cheers
John
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enginewhisperer
Senior Member
Joined: September 2010
Posts: 498
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Post by enginewhisperer on Jul 20, 2011 5:17:53 GMT -5
that's looking rather excellent! I'll have to come and have another look |
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Post by racket on Jul 23, 2011 1:44:35 GMT -5
Filled the karts oiltank with 6 litres of 5W40 synthetic ( recycled from my test stand lube tank) , the 6 litres filled the tank to a half inch below the deairation baffle positioned an inch under the return drain from the turbo . Hooked up a 3 foot length of 1/2 inch bore hose onto the 18 inches of 1/2" copper supply oil line between pump and turbo lube inlet and switched on the pump to cycle some oil around and clean out the lines/pump/filter before hooking up to the turbo proper. With the oil pressure gauge pickup mounted on the pump outlet , ...........yeh , I know , ................it should be at the turbo but just how much restriction can there be in 18 inches of 1/2" copper pipe , ....................LOL, lotsa restriction actually  .......... the gauge was reading 25 psi just to push the flow thru 18 inches of 1/2" copper pipe and 3 feet of 1/2" bore plastic tube between pump and oiltank filler spout ....................there was a good flow coming out the end of that plastic piping though ;D Will leave overnight to see how things "settle" and check for leaks in the morning , hopefully there won't be any . Cheers John |
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Post by racket on Jul 27, 2011 4:25:20 GMT -5
Delivery tube between comp scroll and combustor made and fitted into place , all given a coat of high temp paint and cured in the kitchen oven , looks nice now that the crappy welding is painted over .
Turbo refitted to the chassis and oil lines hooked up and pressure tested , thankfully no leaks.
Oil pump was producing ~70-75 psi and the turb rotor was nearly as free to spin as when there was nil oil pressure in the bearings just residual lube , this should allow spoolup with just the blower , unlike the stiff rotor in the 10/98 engine where full oil pressure produced a 'locked" rotor requiring a lot of starter torque , this one will spin a few revolutions with just a finger flick of the comp .
Should be able to mount the lower section of the combustor tomorrow along with the delivery tube from the comp scroll , the flametube and upper section of the combustor will need to wait until I weld on the "ears" for the stays that will triangulate the engine into the chassis .
She's coming together quickly now , started turning up the flange for the jetpipe Vband clamp today , just need to wait until the clamp arrives to finalise dimensions for mounting the 5 inch dia section of tubing , ~3 inches long , that will be the jetpipe.
Must remember to take a few pics ;-)
Cheers
John
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Post by Richard OConnell on Jul 27, 2011 9:28:52 GMT -5
Sounds like you have you hands full. Got any rough estimates for power output?
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Post by racket on Jul 27, 2011 15:53:26 GMT -5
Hi Richard
~155 lbs dry and ~215 lbs wet from the ~2.75 lbs/sec mass flow ...................if all goes according to the maths :-)
Cheers
John
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Post by Richard OConnell on Jul 27, 2011 21:08:27 GMT -5
Not too shabby... If only you could get decent thrust/weight ratio out of a pulsejet. I was wanting to build one, but they dont make enough power  |
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Post by Johansson on Jul 27, 2011 23:10:36 GMT -5
Not too shabby... If only you could get decent thrust/weight ratio out of a pulsejet. I was wanting to build one, but they dont make enough power Say what?? Around 2000N estimated thrust, if only my friends can pull their thumbs out of their behinds and order thinner spring steel reeds they would have it running by now. |
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Post by racket on Jul 27, 2011 23:51:00 GMT -5
Hi Richard
Yeh , not too bad a thrust output , ....................it could be 4 times that with a freepower turbine attached instead of the A/B .
Anders ..............haven't they started doing any work on "the beast" ......................lazy buggers :-)
Cheers
John
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Post by Richard OConnell on Jul 27, 2011 23:54:29 GMT -5
I guess they arent all bad, but maybe thrust/weight ratio isn as important as thrust/size ratio. Even a valved-pulsejet is typically a monster in comparison to a good turbine that would produce a simliar amout of thrust. I'm definately not knocking pulsejets.. they are relatively easy to build and they can be fun as hell to play with. I cant count the number of old glass jars that have gone ballistic in my yard |
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Post by racket on Jul 29, 2011 1:07:38 GMT -5
A few pics of the progress, this one of the delivery tube entering the main combustor housing Attachments:
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Post by racket on Jul 29, 2011 1:09:23 GMT -5
with flametube inserted Attachments:
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Post by racket on Jul 29, 2011 1:11:25 GMT -5
fuel and preheat gas connections in top of combustor Attachments:
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Post by racket on Jul 29, 2011 1:13:50 GMT -5
combustor assembled Attachments:
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.
.......... the gauge was reading 25 psi just to push the flow thru 18 inches of 1/2" copper pipe and 3 feet of 1/2" bore plastic tube between pump and oiltank filler spout ....................there was a good flow coming out the end of that plastic piping though ;D
