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Author: Subject: second testrun with Crab II
Randy


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[*] posted on 11-7-2020 at 06:04 PM


Quote: Originally posted by jantie  

and the answer to Randy's question:
most of them are the cheapest DIY-tools here in NL.
only thing missing is a XL pipe-bender and the rotary-machine to make the ball-bearingheads.


And thanks Abkayak, I'll take that as a compliment.. :D


Thanks for showing that. The craftsman is obviously not limited by his tools!:thumbup:




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jantie


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[*] posted on 11-8-2020 at 05:49 AM


Quote: Originally posted by rtz  
I don't have a lathe yet either. The first head tube I made; I bored out the bearing pocket using one of these adjustable boring heads. Works but slow to do.

https://www.ebay.com/itm/333725651886

I've since made them like Popeye did and slit the tube to put it inside another. In the future I might just use flanged bearings.


to cut a pipe 90-degrees you probably get that with big saw Carl (Popeye) used, but with a metal-Lathe it is always a 100% accurate.
if the inner tube isn't 100% accurate the bearings will not last very long.
i only have a hand-grinder with a thin cutter-blade, so that's why i asked my uncle..






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jantie


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[*] posted on 11-12-2020 at 09:04 AM


progress for today:

started wih the uprights,.
20201111_143230.jpg - 124kB


it fits in the a-symmetrical rim.
20201111_143254.jpg - 106kB


then copy/paste it..
20201111_145410.jpg - 129kB


and look here: all grown up to stand on it's own 3 tyres..:D
20201110_133450.jpg - 134kB


the took a corner-piece of 25x25mm and 4mm thick.
20201112_151554.jpg - 136kB


cut it, weld it together and drilled 12 and 16mm holes.
20201112_151600.jpg - 124kB


spraypainted and it fits perfect!!
20201112_154359.jpg - 187kB
20201112_154327.jpg - 128kB


cant wait to take it out to the beach..
20201110_132838.jpg - 132kB


next:
completing the uprights and continue with the steeringrods






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Randy


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[*] posted on 11-12-2020 at 09:34 AM


:thumbup: You are getting close to the finish line. Can't wait to see it in action.



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jantie


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[*] posted on 11-16-2020 at 01:49 AM


continued with the temporary foothboard:

i'm still considering what the final shape, material and looks
the foothboard is going to be i've made this for 'inbetween'..


drilled the mainpipe to stick the 10mm solid steel pipes true.
20201113_145304.jpg - 84kB
20201113_145307.jpg - 88kB


welded and spraypaint.
20201113_151856.jpg - 93kB


used leftover ply-wood.
20201113_160733.jpg - 81kB
20201113_161444.jpg - 99kB


used seatbelt-band for foothstraps.
20201115_163713.jpg - 95kB
20201115_163711.jpg - 98kB
20201115_163719.jpg - 60kB
20201116_090713.jpg - 124kB


for fun painted a footprint.
20201116_090724.jpg - 116kB

the test-fase is coming, can't wait..
:D:D






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[*] posted on 11-16-2020 at 05:53 AM


Big Foot would love it!



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Windstruck


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[*] posted on 11-17-2020 at 05:07 AM


Sasquatch approved! Outstanding. :D



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NasaStar-3 (custom 3.2m)

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[*] posted on 11-17-2020 at 05:44 PM


Looking forward to your first ride. :thumbup:
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jantie


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[*] posted on 11-18-2020 at 12:51 PM


first of all thanks for the comments, it is nice to read and also see the read-counter of this topic getting higher every day knowing that people here are interested..
i'm curious if this one wil exceed the Crab I number of readers.



today was a beautiful one to continue on the Coastline Cruizer




the uprights only need the steerlevers
20201118_134843.jpg - 221kB
20201118_140704.jpg - 221kB
20201118_134614.jpg - 171kB


the main adjustable steeringrod from the foothboard
all the way to the back including the extra supported bearinghead
wich will go further to the uprights.
20201118_124326.jpg - 162kB
20201118_143550.jpg - 167kB
20201118_172303.jpg - 117kB

it got to dark so time to call it a day..
20201118_172344.jpg - 115kB
20201118_173133.jpg - 132kB

so close but still a few hours of work away.. :smilegrin::smilegrin:






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jantie


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[*] posted on 11-28-2020 at 08:42 AM


finished for testing.. YEAH...!!!!


main steeringrod with protection ( ex-racingcycle innertube.. :D)
20201128_133915.jpg - 135kB


rear axle
20201128_144201.jpg - 146kB
20201128_144204.jpg - 122kB
20201128_144211.jpg - 140kB


with tires
20201128_144612.jpg - 146kB
20201128_144836.jpg - 149kB


max downwind steering position
20201128_150959.jpg - 155kB


max upwind steering position
20201128_151006.jpg - 156kB


does it pack down is Redsky probably gonna ask?
owww.. yeah, way better than Crab I
20201128_152919.jpg - 171kB
20201128_153824.jpg - 154kB

click here for a fullsize pic


now only wait for:
wind
low tide
dry beach
good wheater
time
etc, etc...






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Randy


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[*] posted on 11-28-2020 at 09:43 AM


I hope you get your list of 5 soon.



694df9789445cf6426e95f87b6e1eae9--tiger-faith.jpg - 11kB




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RedSky


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[*] posted on 11-28-2020 at 04:54 PM


:bouncing::bouncy::bouncing:
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[*] posted on 11-29-2020 at 05:56 AM


Absolutely loving watching this beauty come together. I was studying your photos this morning and one thing I was trying to figure out was how you made adjustments for different height riders. I would think all riders would need approximately the same angle in the knee at rest so that they put their feet on the pedals in a relaxed way when riding. One wouldn't want to be always plantar flexing (pointing your toes) just to stay straight or be forced into dorsi flexion as the crab tracks to center. I think I see a way of doing this but I'm not sure. It appears that the foot plates are at a fixed angle when the back wheels are straight (I get that they pivot; I'm talking about their neutral position).

I'm sure you discussed all this with your original two-wheels-in-front thread as the same problem would have been there too, but I forget. As you've no doubt considered, leverage will be important here as your ankle only has so much comfortable range to go through as you turn the crab from straight. I'd love to hear your thought on this as you would have needed to give this aspect of the design a lot of thought.




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NasaStar-4 (2.5m, 4.0m, 5.5m, 7.0m)
NasaStar-3 (custom 3.2m)

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[*] posted on 11-29-2020 at 08:35 AM


:thumbup:
Congrats on getting the Cruizer ready for a first run, hope you're gonna have at least as much a fun time on this first ride as I've had, following you build log here. Great photo & excellent construction.

Really thoughful design of the crazy linkage. And keeping the CoG low. And making it all into such a small pack for transport.

Godspeed! Enjoy!




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jantie


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[*] posted on 11-29-2020 at 01:41 PM


Thanks all for the compliments..!!

To adjust the board to someone with shorter legs i just
unscrew the 8 bolds of the 4 (exhaust) clamps and slide
it backwards to the seat. Then by screwing/adjusting in the threated rod of the main steeringaxle to (re-)set the angle of the board.

20201118_172344.jpg - 112kB

for myself it's also gonna be the question of how to set the angle of the board since the steeringwheels are in the back.
i have absolutly no idea how it is going to ride, slide, turn and break.

but what i did gain is the big weightdrop in compare with Crab I:
just under 20 LBS lighter in total, and a way different weight ratio on each wheel when i'm in it.

nice touch: after a re-measurement the triangle from the tips of all wheelbolts was near perfect, just 0,5% deviation.
but checking after allignment of the 3 wheels i got it right up to 1mm
that's 0,03937008 of an Inch..
:cool:

click here
for a short movie of the build with most of the pics in it.






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kite-movies about me on other channels:
kitebuggy-tandem movie
duobuggy movie
side-ride + tandem buggy







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Windstruck


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[*] posted on 11-29-2020 at 02:22 PM


That's how I figured you would adjust for leg length. Thank you for the clarification. So cool to watch it come together.



Born-Kites:
RaceStar+ (3.0m, 5.0m, 7.0m, 14.0m)
RaceStar (9.0m, 11.0m)
NasaStar-4 (2.5m, 4.0m, 5.5m, 7.0m)
NasaStar-3 (custom 3.2m)

Buggy:
Peter Lynn BigFoot+ nose & tail; midsection VTT rail & seat kit; home-brewed AQR

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jantie


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[*] posted on 11-30-2020 at 03:33 PM


first time out was really good.
the advantage to allready know how to Crab comes in handy,

but still it is a different Crab.
i could feel the weight difference because this Crab tracks like a train.
the way it continues after a powerslide is more stabile than Crab I.
also i don't get lifted on the rear side like Crab I.
but run the risk of getting too confident and when i do eject.... take cover!!
:smilegrin:

only had to make 1 minor adjustment on the beach:
the main steeringrod needed to be 2 cm longer,
not to bad for a backyard preset.

conditions today weren't that great but good enough for a decent testrun.
it took more time to pack, get out there and assemble it and taking it apart and go home than the actual time i got it to run,
but it was so well worth it.

used a few actioncams to record this one.
too bad there was no one to film a driveby and the cam in the kite came a little loose.
but i got enough to look back on and make a good impression.

next time with more camera's... :D:D



click here
For a short testrun movie...








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kite-movies about me on other channels:
kitebuggy-tandem movie
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side-ride + tandem buggy







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Randy


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[*] posted on 12-1-2020 at 05:26 AM


It's really cool to see that you have got it up and running! Keep those videos coming!

Looking back to your first post on this thread, it has only been about 75 days from design to completion. It is pretty amazing you did all that quickly and it seems ride quite well right "out of the box."




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jantie


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[*] posted on 12-1-2020 at 03:04 PM


many thanks Randy, it took this 'long' mainly due to waiting for parts
and being an outside builder i need decent weather.

it took about 80 hours to build but easily double the time
thinking, re-thinking, building it, riding it and improving it in my mind.
and all that 100 times over...
But to make the frame seat-section multi-purpose saved
some serious time.

the advantage was the build and riding the first Crab.
But to be really honest:
if i'd knew nr. 2 was riding this good with the steeringaxle at the rear i would never build nr.1

still glad i did since i learn every time with (re)building a buggy.
because making and modifying one is for me almost as fun as riding it..






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kite-movies about me on other channels:
kitebuggy-tandem movie
duobuggy movie
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RedSky


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[*] posted on 12-1-2020 at 08:02 PM


Wow nice video! Good job converting it from VHS! :D
I watched your video earlier today (Tuesday) on my phone and again on desktop when I got home that evening.
Nice to finally breath some of that fresh oxygene. :smug:
Great job! Looking forward to seeing more.
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[*] posted on 12-2-2020 at 06:26 AM


In retrospect (and biased no doubt by your comments and comparisons of Crab 1 and Crab 2) the Crab 2 design seems to make so much sense from a weight distribution and tracking perspective. Lots and lots of linkages and pivot points in #2! That's clearly the price of steering in the front (where your feet are) but actuating in the rear.

So hard to wrap my head around the visual of you riding sideways; really plays with my mind! Really good stuff.




Born-Kites:
RaceStar+ (3.0m, 5.0m, 7.0m, 14.0m)
RaceStar (9.0m, 11.0m)
NasaStar-4 (2.5m, 4.0m, 5.5m, 7.0m)
NasaStar-3 (custom 3.2m)

Buggy:
Peter Lynn BigFoot+ nose & tail; midsection VTT rail & seat kit; home-brewed AQR

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jantie


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[*] posted on 12-2-2020 at 08:31 AM


@ Windstruck:
there are more pivotpoints, hinges and linkes on the first Crab..
a total of 15 in nr.1 and just 11 in nr.2


but that's improvement:
it's the 2.0 version with less mistakes or unnessesery things.
that explains also the weight-loss..
:D

the first is a mix based on all the pics an movies i found on the internet,
99% of them with the steeringaxle in front of the rider..
there is one picture of an Australian or New Zealand rear-steering Crab,
but i cannot find it anymore...



for today:
made a slight improvement to the footboard:
the (seat)belt i used folded in sometimes but i want to put my feet blindly
in position knowing they are suppported at all times,
added some sticky-sand tape for more grip.


20201202_131838.jpg - 204kB






to visit my Youtube-channel.


kite-movies about me on other channels:
kitebuggy-tandem movie
duobuggy movie
side-ride + tandem buggy







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jantie


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[*] posted on 12-14-2020 at 09:22 AM


made 2 camerasupports on Crab II.
also ordered a 360 degrees cam, and curious about
how that is gonna look.

unfortunatly the Netherlands is of now in lockdown,
still hoping to take it out soon.



frontwheel:
20201214_145642.jpg - 76kB


with cams:
20201214_143726.jpg - 74kB


rearwheel
20201214_150358.jpg - 98kB
20201214_150338.jpg - 98kB



with cams:
20201214_143523.jpg - 83kB
20201214_143518.jpg - 89kB


overview:
20201214_143909.jpg - 136kB
20201214_143915.jpg - 142kB





for a short video






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kite-movies about me on other channels:
kitebuggy-tandem movie
duobuggy movie
side-ride + tandem buggy







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RedSky


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[*] posted on 12-14-2020 at 09:45 PM


All angles covered. Look forward to the video after lockdown. You will love the 360 camera.
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jantie


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[*] posted on 12-29-2020 at 02:51 PM


yesterday wasn't perfect, but way better than spending the day indoors.

got to try the camerasupports and most are good and some not yet..


for the short movie with a nice beat







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kite-movies about me on other channels:
kitebuggy-tandem movie
duobuggy movie
side-ride + tandem buggy







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Randy


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[*] posted on 12-29-2020 at 03:32 PM


Great to see you have gotten out again. Keep it up!



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[*] posted on 12-29-2020 at 04:16 PM


Came here straight from youtube. xD
The top down view looks like you're powersliding a regular bug haha. Welldone on a great job! :thumbup:
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Windstruck


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[*] posted on 12-29-2020 at 04:19 PM


All your camera mounting efforts seem to have truly paid off. Super cool. Still hard to look at from the sky cam; hard to get my head wrapped round your crabby patty. No free napkins!



Born-Kites:
RaceStar+ (3.0m, 5.0m, 7.0m, 14.0m)
RaceStar (9.0m, 11.0m)
NasaStar-4 (2.5m, 4.0m, 5.5m, 7.0m)
NasaStar-3 (custom 3.2m)

Buggy:
Peter Lynn BigFoot+ nose & tail; midsection VTT rail & seat kit; home-brewed AQR

NAPKA Member US2815
SWATK Member UT0003
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jantie


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[*] posted on 12-29-2020 at 10:55 PM


Thanks people, hope to get some more miles in 2021
in all 3 buggy's and make more video's..







to visit my Youtube-channel.


kite-movies about me on other channels:
kitebuggy-tandem movie
duobuggy movie
side-ride + tandem buggy







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RedSky


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[*] posted on 12-30-2020 at 06:04 PM


:thumbup::thumbup:
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