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| Home Made Boards (6188 Posts)
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Home Made Boards |
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Manta
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On 2/4/2005
Tod
wrote in from
United States
(12.148.nnn.nnn)
my hill should be (mostly) dry by tomorrow pm.
The "05" season shake down runs begin...Thanks psYch0Lloyd!!
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all turned around....
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On 2/4/2005 psYch0Lloyd
wrote in from
United States
(198.160.nnn.nnn)
which way is up?
oops... the post below should have indicated an "m" patern.
beware the manta
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choke.... cough, cough... backatcha
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On 2/4/2005 psYch0Lloyd
wrote in from
United States
(198.160.nnn.nnn)
bwaaaaaaa you funny thrill killa! ima die'n ova hea...
...so ya heard that i've made a new kind of deck, eh? chef said the ride leaves him light headed. oltod's craving mo tail.
checkitout: which ever direction you run your hand accross the bottom of the deck your hand travels a "w" pattern. thats front to back side to side and corner to corner.
don't worry, you'll know it when you see it.
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Knuckle-deck
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On 2/4/2005 Chris B
wrote in from
United States
(204.78.nnn.nnn)
....A red bud deck i can smoke after the race?...
gonna call it a "Tie Stick"?
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piece of mine...
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On 2/4/2005 psYch0Lloyd
wrote in from
United States
(198.160.nnn.nnn)
just got some exciting news about the prices of some of the exotic new materials that i have been developing skateboard products with, they've come down in price...
...it's now just $600 instead of $1000 per square foot!
wait till you see what i've got in store for you guys this year.
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herbn comp 1's
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On 2/3/2005 herbn
wrote in from
United States
(205.188.nnn.nnn)
compared my new trucks directly to my ol set of comp 1's, 5 degrees is tough to spot,but it should make a difference,i gotta get an angle finder to find out if i even varied them. My pivot looks like it is a tiny bit further from the board,but my axle is split and goes through the middle of the bushings ,so the ride height is nice and low. With bearing pivots and a delrin surface gliding washer for the hanger these trucksshould be SMOOTH,the delrin washer acts like a thrust bearing and leavess the microbearings in the baseplate with a single job ,spin smoothly, with out any twisting(binding) stresses. Imade some washers that shoulder the powell hardcore bushings down to 8mm, i was thinking of a sleeve of rubber or urithane(thin stretchy tubing) ,to take up the space, but i think the way it is it may just free up the action of the bushings.
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one for the ol school
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On 2/2/2005 herbn
wrote in from
United States
(152.163.nnn.nnn)
on my new trucks,two part bases,i stuck with the regular width,1.625, but i let the length be what ever it's gonna be. Ok,i went about 40 degs pivoting angle,that locks the kingpin at 60 degs. The axle is lined up with the pivot and it goes through the kingpin. That works out to 1.3 inches(33mm) from the board. So what do you suppose the length of the hole pattern is? seems like it's gonna be 2.495,very interesting, huh? I'm using an 8mm cromoly kingpin,same as axles,it's gonna be supported at both ends and with bearings at the pivot they take alot of the impact loads and take stress off the kingpin.
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maybe it's just me
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On 2/1/2005 psYch0Lloyd
wrote in from
United States
(198.160.nnn.nnn)
the materials are quite different now and the shapes have totally changed...
...maybe some other day.
(and this isn't directed at you.)
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axle troubles
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On 1/30/2005 herbn
wrote in from
United States
(64.12.nnn.nnn)
i still can't totally explain it but,the axles 8mm for my trucks slid in then got tighter then stopped bfore they were al the way in,i liened on the arbor press handle,i hung from the handle,once they're in like that there is no pulling them out,no way,After considering the options, i could have just cut and threded them and they "probabely" would have never come loose,i bounced up and down on the handle of my arbor press, the axles very suddenly bent,like 90 degrees. Load the up in the power cutoff hacksaw, then back to the lathe and center drill the stub,then just drill bigger and bigger holes until the sleeve gets stuck on tghe drill and is easy to remove.
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new hangers
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On 1/28/2005 herbn
wrote in from
United States
(152.163.nnn.nnn)
it's gonna be interesting,the area around the bushings is very minimally hollowed out. Just minimally beveled,a bit of extra weight but really strong and smooth,i think i can core the hanger out different and see how light they can go without sacrificing strength. My trucks have gone lighter and lighter, these seem to be going a bit stockier, the bases are light though so the center of gravity is gonna be nice and low, they are 40 degree speed trucks rather than my usual 45 degrees. For the deck i think i wanna go 50+ inches but its gotta be light,i was gonna go hollow with thin birchply skins but 50+ inches of .125 birch ply? i think it might be time to try a poplar beam core with major sections of balsa glass skins amybe some extra carbon in non edge areas ,maybe just wrap the balsa sections. tbc
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hanger work
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On 1/27/2005 herbn
wrote in from
United States
(64.12.nnn.nnn)
one of them is pressed together, i hid a locked in m6 nut on the inside of the axle pieces, when i drill through the axle bores i'll feel when the drill breaks through. i'll make the axles with m6 threads on the inside and a tight sliding fit for threading them into place.
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rake for height adjustment
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On 1/24/2005 herbn
wrote in from
United States
(205.188.nnn.nnn)
in older hangers, i've had some rake(offset),if you look at my pics,you can see imake hangers out of essentially three significant pieces; the center,and the axle holders(r and l)with a tight press fit between them. The center piece is machined with the bushing seats,i have sort of settled on having .100 between the bushings,theoreticly thinner allows for a bit more steering,but i think if you figured it out or did a physical measurement a few thousanths isn't gonna add a lot of degree's in lien.The measurement for hole where the parts inter lock seems to end up at .625 smaller is worry some or perhaps flexier, bigger and i start to have concerns about the thickness of the wall surrounding the bore,i think an .125 wall thickness is a nice round number .100 would work but i'll be secure with the extra .025, this allows for about an eight inch offset, which i've done in the past,i think i've done .063,.083,and .100,this time i figured i'd go like randal dh's ,no offset.There were always to many other variables in the whole board set up tohow any terrific advantages to these different offset. One recent truck was accidently set up with the hanger inverted (.100)and i can't say i noticed.
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let me try again
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On 1/24/2005 duane
wrote in from
United States
(165.121.nnn.nnn)
the axle would be in the same plane as the pivot axis, but not centered, so rotating it 180 degrees without flipping it over would change the axle height. It could be flipped over like a randal without changing anything.
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asymmetric pivot
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On 1/24/2005 yan0
wrote in from
United States
(140.233.nnn.nnn)
Hey there, This could just be me, but it seems like having a pivot that is off center (top to bottom) like the one proposed would do funky things to the way the truck responded. If the pivot/axis of rotation for the whole hanger is above or below the seat for the bushings, the hanger will pull or push the bushings (and kingpin) as opposed to flexing them like a normal truck. That said, you guys have a whole lot more experience making trucks than I do so....
yan0
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and furthermore...
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On 1/24/2005 duane
wrote in from
United States
(68.15.nnn.nnn)
such an arrangement would make strange things possible
look ma, no kingpin
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herb'n new ones
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On 1/24/2005 duane
wrote in from
United States
(68.15.nnn.nnn)
I see what you are saying for the 8mm pivot, I've had some things on the drawing board where the stock is about the size you say (1" by 2" total bar stock), and the hanger can be flipped over (top to bottom) to change the axle height. If you have a bearing pivot top and bottom, then why not make the axle assymmetric to the center line, quick flip and ride height could change 1" or whatever increment you want. I don't like things too high as it is less stable, but too low and you can't turn, I see too many speedboarders so low that they slide around turns with glove down, turns that can be carved standing with no sliding at all.
Sounds cool, especially if you can figure an easy way to mount the bearings so that the hanger can be quickly released, whether to flip or just to change wheels quickly, I like having multiple hangers loaded with wheels for a quick change.
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my last trucks
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On 1/23/2005 herbn
wrote in from
United States
(152.163.nnn.nnn)
pics are about six pages back.
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new hangers
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On 1/23/2005 herbn
wrote in from
United States
(152.163.nnn.nnn)
started machining them yesterday, i'm making them a bit differently than previously. These are for the shallow(40 deg) bases,a bit longer on the pivot side, the bars of metal are 1.0 by 1. five, which is a bit close for a one inch bore(for bushing seat)and to have a 8mm post press in(pivot pin) so i bolted on a bit of quarter inch stock,with some tiny m4 bolts,it just sort of extends the billet right where it's needed. I drilled both sides of the hanger for these extensions cause i've been contemplating a second hanger support bearing. Similar to the gullwing style bracket on my last truck,but on the other side of the hanger. Oh well ,wait for the pics.
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Duane
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On 1/19/2005
cnova
wrote in from
United States
(69.3.nnn.nnn)
Duane, throw me your e-mail address.
I have a couple of things that I want your opinion on.
Chris
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Turbine
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On 1/19/2005 Bob
wrote in from
United States
(132.250.nnn.nnn)
The JetCat P200 UAV version turbine is 50lbs of thrust at 118,000rpm, 25oz. a minute at full throttle. At a cost of about $5K for just the turbine. I have a 50oz header tank in the mount and will be making a 1.5 gallon composite tank that slings under the backside of the body pan wedge. No plans for aero devices until Engineering Model #2. This one will be speed limited by the computer to 85mph... for now.. I know that this luge was stable to 86.4 mph under gravity power.
And I know what you mean.. Unless some corp wants to fly thier colors on this I may just put ACME JETLUGE stickers on it.. haha
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Turbine
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On 1/19/2005
Jack in Aurora
wrote in from
United States
(208.20.nnn.nnn)
That rig looks awesome. Is the turbine homemade? How many pounds of thrust does it generate? You might think about a front spoiler rig to keep it on the ground and maybe some kind of windtunnel testing if possible before you try it. My $.02 worth I think its great and showed the picture to my office partner. His comment was, "Somewhere a roadrunner is laughing."
Cheers,
Jack in Aurora
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Turbine
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On 1/19/2005
Adam
wrote in from
United States
(198.144.nnn.nnn)
Bob, That's a fascinating project you've got going! How much thrust does that puppy generate, and what kind of burn time does your onboard fuel supply allow?
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Turbine Safety
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On 1/19/2005
Bob
wrote in from
United States
(132.250.nnn.nnn)
Duane.. 90% of this design is safety. Got Nomex from wife for Christmas, onboard servo and automatic actuated co2 dump included Click here for link Also have about 10 failsafe conditions that get detected and handled by the onboard computer. This ride will have 4 Randal Luge Trucks unless someone wants to get in on the project and design me some custom trucks.... My biggest engineering prob at the moment is how to dampin road shock from the Turbine..
SKate Car... yup. sure would be sexy.. I posted in that forum a few months ago. The goal for this model is to keep it a bolt on module, that way I can mount it on anything. Dr No's 3/4 fairing gravity bike and my son's 91 accord are next inline. Believe it or not.. A goped has already been done.
bob
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turbine safety
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On 1/19/2005 Duane
wrote in from
United States
(68.15.nnn.nnn)
how about a nice nomex fire suit, and an on-board fire extinguisher in easy reach ? seriously !
that said the turbine would look real sexy mounted at the back of one of my skatecars
regarding handling, I'd be a little careful around sharp turns, the weight and the thrust moment of the engine way back like that is significant, both tending toward dreadful oversteer, double rear trucks / wheels might help
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HERBN's JetLuge Question
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On 1/18/2005
Bob
wrote in from
United States
(68.48.nnn.nnn)
HERBN said " i was gonna question if it's really a luge(skateboard variation) since it doesn't rely on gravity or pushing power for forward power, but then again a moto board is still a skateboard, so why not?" ......
Bob " As far as this project goes I would still consider it a streetluge. This will still be a fully functional Roger Brothers StreetLuge when I am done with it. The Turbine mount and throttle fixture are simple bolt-on devices that require no extra holes or welds. Still lean steer and foot braking. The ultimate idea on this ride was much of the desing..... how to ride gravity until it peters out or I get unhappy with the terminal velocity of the road and then I can call on the "BOOST", shut it down and start it up as many times as I want... kind of in a hybrid car fashion. It was kind of tough but it seems the design will work. On and off as many times as I want or untill I am out of gas or batteries.. Once the concept and systems are proven I make some composite bolt on fuel cells will repackage it to bring the turbine and thrust line to a lower CG and it will handle even better. For those that have riden luge much I know you wished you had boost in your dreams when the smooth ass road slowed to 30 or 40 mph. Don't be surprised to see me show up at a race wit h this luge and then bolt the Jet Package on for a demo. Beside it makes for a good oversized leaf blower and track dryer.. lol
bob
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