sven
Veteran Member
Joined: February 2012
Posts: 102
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Post by sven on Feb 2, 2013 9:36:05 GMT -5
Very nice Anders, really good job!
Sven
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metiz
Senior Member
Joined: April 2011
Posts: 297
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Post by metiz on Feb 2, 2013 13:43:35 GMT -5
That's one professional looking build man, fucking awesome! If you are unsure about the frame, you could model it in solidworks (just the frame, no need for engine, wheels etc) and then run a static study. You just have to define your drawing: material, torque's, moments, linear forces etc. You can now easily spot any and all problem area's and even get solidworks to suggest improvements (weight cuts for example)
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Post by Johansson on Feb 2, 2013 15:19:51 GMT -5
Thanks! I think I skip any cad modelling, since I cannot do it myself I will have to rely on someone else to do it and then suddenly the whole frame build will be over my head... I´d rather get a pointer or two from experienced builders, at least those I can understand.
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Post by racket on Feb 2, 2013 15:51:11 GMT -5
Hi Anders
LOL.........just copy a basic design ......................you'll be going in a straight line hopefully so not a great need for torsional strength, more just a case of having a strong ass end between gearbox and rear wheel and some tubing to hold the front forks and wheel in position , some of the old drag bikes had extremely lightweight front ends on 10 second bikes .
Its always possible to add a bit of sheetmetal bracing between the tubing at the steering head to greatly increase stiffness in that area .
Heh heh , maybe you shouldn't listen to me , I once watched a mate riding a bike with my frame mods when it split in two , he was hanging onto the front end whilst the rest of the bike and motor were doing cartwheels behind him and all I was worried about was all the broken cables hanging from the handlebars ;-)
Cheers John
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Post by Johansson on Feb 2, 2013 16:44:30 GMT -5
Hi John,
Yup, figured I won´t run any curvy tracks with it so a good eye should be enough to estimate where the supports should be. The upper frame tube is 1 1/2" chromemoly and the rest is 1" chromemoly so I cannot imagine it would flex after a couple of X supports have been welded in.
The sheet metal bracing was a good idea, should add much strenght to the steering head.
Cheers! /Anders
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Post by Johansson on Feb 8, 2013 14:19:48 GMT -5
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mrcurly
New Member
Joined: June 2012
Posts: 2
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Post by mrcurly on Feb 8, 2013 15:31:33 GMT -5
This is really amazing, very nice. I like your seat
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Post by Johansson on Feb 8, 2013 16:04:58 GMT -5
Thanks! The test seat is indeed a bit hard, makes life miserable for my poor hemmorhoids...
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Post by Johansson on Feb 11, 2013 13:52:25 GMT -5
I rushed through an exhaust pipe build last night between a test run of the jet kick and some sleep, only 60 hours left until we head off to Speed Weekend and lots of stuff to arrange left! It feels like the engine can breathe much better with this kind of exhaust compared to a single, upwards pointing one. I have also made a pair of test pegs and I have no problem at all sitting on the bike with my feet in front of the exhausts which I strongly doubted earlier. I can add a bend furthest out later if I need to, I cannot angle them anything this close to the centre since the front sprocket will be in the way. Cheers! /Anders
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Post by turbochris on Feb 16, 2013 11:41:11 GMT -5
I'm thinking about putting a wastegate between the gas generator and power turbine. I'd use it like a clutch to bleed off power while keeping N1 up high for response.
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Post by Johansson on Feb 20, 2013 15:44:35 GMT -5
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Post by racket on Feb 20, 2013 17:24:07 GMT -5
You're making me jealous :-)
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Post by turbochris on Feb 21, 2013 11:16:09 GMT -5
that had to be a FUCKING GREAT DAY!
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sven
Veteran Member
Joined: February 2012
Posts: 102
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Post by sven on Feb 21, 2013 11:56:07 GMT -5
Nice, what was the pulsejet top speed?
Sven
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Post by Johansson on Feb 21, 2013 13:38:43 GMT -5
Except for the slight hangover it was great. The pulsejet managed an average of 151km/h in the measured kilometer, it had a recorded top speed of 155km/h so it can´t go any faster with the thrust/drag numbers it has now. Next year they are planning to add fairings and tweak the engine for even more thrust so hopefully they will enter the 200km/h club. If everything goes as planned I will have my turbine bike ready for next years racing as well so an interesting workshop year ahead!
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