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Author: Subject: second testrun with Crab II
jantie


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thumbup.gif posted on 9-14-2020 at 01:15 PM
second testrun with Crab II


just for fun i'd like to build a different version of the Crab.

I'm gonna call it: 'Coast-line Cruiser'
this one is a mirrored version with the steering axle in the back.
therefore when you ride it the single front wheel will probably not be visible for the rider because of the footboard.
so this might give the feeling of low flying because of that.

and the goal of a better trailing because 2 steering wheel can easelly give friction and therefore cause speed reduction wich Crab 1 has slightly. not much, but slightly.... and if i can reduce that.. :cool:

maybe the weight disrtribution with this setup will give a better
result and easyer high speeds, also the goal of weight reduction is a priority.

this version is allready made by more guys so i am not taking any credit for the idea..

keep you posted









20200914_220049.jpg - 153kB






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RedSky


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[*] posted on 9-14-2020 at 02:51 PM


I like this :thumbup:
Excuse my lack of knowledge but might it be easier to use the single front wheel for steering ?

edit - I think I see the mistake in my suggestion above. You'd be going around in circles. :D
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jantie


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[*] posted on 9-14-2020 at 10:28 PM


Quote: Originally posted by RedSky  
I like this :thumbup:
Excuse my lack of knowledge but might it be easier to use the single front wheel for steering ?

edit - I think I see the mistake in my suggestion above. You'd be going around in circles. :D



:D:D:D
The other way around in fact, I will not be able to steer at all..

But keep coming with input, comments or suggestions.
I'm only human and can also easily miss something...






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Juan


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[*] posted on 9-15-2020 at 05:27 AM


Interesting idea:thumbup:
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RedSky


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[*] posted on 9-15-2020 at 06:19 AM


Quote: Originally posted by jantie  
Quote: Originally posted by RedSky  
I like this :thumbup:
Excuse my lack of knowledge but might it be easier to use the single front wheel for steering ?

edit - I think I see the mistake in my suggestion above. You'd be going around in circles. :D



:D:D:D
The other way around in fact, I will not be able to steer at all..


That is true! Don't ask me for any advice. :lol:
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khaakon


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[*] posted on 9-19-2020 at 12:09 PM


I'm just curious, why the curved backaxle?

Driving characteristics? Weight distribution (edit: surely not?)? Forces/stiffness in the buggy? Shorter steering rods? Or ...?

I've been following your absolutely fabolous work on the Crab - really impressed and amused, lovely project!




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jantie


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[*] posted on 9-19-2020 at 01:29 PM


thanks Khaakon,

the reasons for a curved axle are:
1#
it's something else than just a straight pipe and bend ant the end on both sides.
and it needs to be bend because of clearence for the tires that are in line instead of a 90 degrees angle like a 'normal' buggy because they need room to steer.
2#
i'm probably going for a 50mm pipe so it will be rigid enough and no further stiffening is needed.

i'm trying to make the steering and the rest of this creation as light as possible.
Crab 1 is kinda heavy, and the weight distribution is not perfect.
when i get lifted only the rearwheel get's airtime,but in my 'normal' buggy all 3 go 'up and away..'
:D:D

and when starting to drift a little but equally with three wheel in line costs less speed.
So this rear-steer setup hopefully also translates in a better allignment when i ride this new creation a little overpowerd. because there are 2 wheels that steer instead of 1, there are always 2 wheels that might drift wich causes decrease in speed.
with making that better i try to prevent that.

important: I do not want to make a copy of Crab 1
everything and every part if possible is gonna be reversed, up-side-down, mirrored or completely different.

so far i've got the tires, rims, a lot of nuts and bolds left from previous projects.
i've calculated that the radius has to be about the same as the length of the steering axle,
now finding a way or someone who can do that nicely.

for the footboard on the Coastline Cruiseri've got also a nice and different idea..


keep you posted when progress is made.. :cool::cool:






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Pablo




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[*] posted on 9-20-2020 at 11:35 AM


Looks interesting, my only concern is the possibility of cutting hard and loading up the buggy and lines. Do you figure the setup will be stable enough to not tip over the front corner?

I only ask this because even in my nice stable buggy, with the right beach conditions and enough power it has a tendency to try and pull the whole buggy over the front corner. Look up the Reliant Robin or old ATV footage, companies have all switched to two tires in front, one in the back to avoid this same tuck and roll. The crab is moving sideways though, so not sure if this would apply.




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jantie


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[*] posted on 9-22-2020 at 01:35 PM


@ Pablo

Crab 1 has been thoroughly thrown around on rough and flat sandy surfaces and the only time a tire
lifted was the rear one when driving really overpowerd.

it's gonna be a trial-and-error story.

in my normal buggy i also had some exits and tip-overs in the past, mostly due to lack of experience.
now after well over 17000 miles i know what and how to but more importantly what not to do to prevent an OBE.




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jantie


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[*] posted on 10-7-2020 at 11:07 AM


the setup to paint a picture in realtime of how it's gonna be:

the middlesection (seat) is a part of Crab I.
i'm using it without modifying so it's compatible for both Crabbies.



1.jpg - 204kB
2.jpg - 210kB
3.jpg - 222kB

steel is ordered so now wait for the phone to ring..

that's it for now. :cool:






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RedSky


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[*] posted on 10-8-2020 at 12:52 AM


:thumbup: :cool:
This type of crab makes more sense with less drag from two wheel steer. Maybe also include an optional fork and rear axle kit to convert from crab to regular buggy.
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Randy


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[*] posted on 10-8-2020 at 04:43 AM


It is going to be fun watching this take shape! Keep posting the pics as you go.



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jantie


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[*] posted on 10-10-2020 at 05:19 AM


Quote: Originally posted by RedSky  
:thumbup: :cool:
This type of crab makes more sense with less drag from two wheel steer. Maybe also include an optional fork and rear axle kit to convert from crab to regular buggy.


it hopefully does have less drag but time will tel..
and as for a conversion-kit:
i already have a 'normal' buggy so there is no need for that
:D

9.jpg - 194kB
15 years old and well over 26000 km on it..



today's progress is small but better than nothing:

found leftover material wich is perfect for the ballbearing head's to hold the upright's:
it's stainless steel and even better: it's for free..!!
13.jpg - 141kB
my uncle has a steel Lathe/miller to make the bearings fit perfectly.


this is the rear-end from crab I wich will be multifuncional:
8.jpg - 170kB
this part can be removed:
12.jpg - 188kB


and now it's also suitable for the Cruizer.
fortunatly the supports for the roll-bar can also be used
so i don't have to make that double.


11.jpg - 201kB

5.jpg - 158kB

6.jpg - 191kB

at both ends the axle (50mm) will be extendend with 1 size smaller (42mm) pipe wich will be bend in a 70 degrees angle inward.
so not a complete curved axle but that was gonna be to costly..
and this rear-axle was the one that was used to widen and extend the original Libre V-max this buggy was before i converted into Crab I

so that's it for now..









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Randy


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[*] posted on 10-10-2020 at 11:44 AM


Imagineering at its best!



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jantie


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[*] posted on 10-10-2020 at 12:09 PM


Thanks Randy
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jantie


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[*] posted on 10-15-2020 at 07:57 AM


today's progress:

made the rear-axle separable for easy and compact transport
cutting, grinding, welding, grinding again, sanding and painted with zinc-spray

14.jpg - 119kB
15.jpg - 177kB
16.jpg - 194kB
17.jpg - 108kB
18.jpg - 141kB
20.jpg - 171kB
21.jpg - 160kB
22.jpg - 112kB

to be continued...






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RedSky


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[*] posted on 10-15-2020 at 05:33 PM


Randy is right. I do admire people who can do this kinda stuff. :thumbup:
Is the translation you're looking for, a bearing press ?
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jantie


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[*] posted on 10-15-2020 at 07:03 PM


this is what i mean...

draaibank.jpg - 114kB


edit: translated from dutch (draai- en freesbank) Lathe and milling machine






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RedSky


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[*] posted on 10-16-2020 at 04:32 PM


Looks like a lathe of some kind.
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jantie


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[*] posted on 10-20-2020 at 10:58 AM


today continued on the frontside of the frame:

setup
25.jpg - 209kB

locked in and set level
26.jpg - 166kB

used a laser to be more accurate
27.jpg - 147kB

result after the cut
28.jpg - 158kB

setting the axle-pipe
the frontframe in total is still to long
but that will come on a further stage
29.jpg - 162kB

result so far..
30.jpg - 174kB

wheelbolt not welded yet but looks great if i may say so
31.jpg - 179kB



to be continued...
:D:D






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RedSky


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[*] posted on 10-20-2020 at 10:51 PM


My first thought, why did he weld table and chairs to the buggy seat. :duh:
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jantie


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[*] posted on 10-21-2020 at 08:12 AM


unexpected dry wheater today

fixed the frontwheel axle to the frame:


first i took a M20 nut, shaved the thread
and slided it over a M20 bolt,
grinded a groove
41.jpg - 115kB

welded it
40.jpg - 136kB

grinding an sanding
39.jpg - 136kB

aligned it
38.jpg - 191kB

again welding
37.jpg - 180kB

alignment on the frame
36.jpg - 211kB

welding
35.jpg - 139kB

grinded, sanded and painted
34.jpg - 179kB

drivers view.
33.jpg - 197kB

slowly getting there...
32.jpg - 214kB


that's it for now.
:cool::cool:






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[*] posted on 10-21-2020 at 08:34 AM


Seems like you have done a lot.



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RedSky


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[*] posted on 10-21-2020 at 06:31 PM


Seems to me at least, a little more intuitive to have the single wheel facing rider. This is going to be great! :thumbup:
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jantie


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[*] posted on 10-25-2020 at 08:25 AM


Continued with the steering:

from scaffolding used 2 tubeholders an slightly modified them
57.jpg - 202kB

use 10mm massive steel round bar
and exhaust clamps to make it adjustable
51.jpg - 223kB
58.jpg - 167kB

small plates welded to connect the front to the rear
59.jpg - 173kB
62.jpg - 189kB
61.jpg - 184kB

setup to see how it looks
63.jpg - 225kB

setup with tire
65.jpg - 204kB
64.jpg - 205kB

that's it for now..
:cool::cool:







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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 11-5-2020 at 05:43 AM


continued with the rear-axle:

made 4 incisions in the bended piece 0f 40mm so it would fit (with a hammer) in the 50 mm pipe
68.jpg - 208kB
69.jpg - 173kB


times 2..
70.jpg - 171kB


allignment on the complete frame
71.jpg - 185kB


after welding, grinding, sanding and spray-paint
73.jpg - 170kB
74.jpg - 226kB


rideheight made for these tires to be used on a really smooth beach,
bigfoots will give more rideheight in case of a bumpy surface.
76.jpg - 233kB
75.jpg - 209kB
77.jpg - 207kB


and got these back from my uncle,
ready to be welded on the steeringaxle
78.jpg - 156kB


next time:
uprights en steeringrods
goal is first test-run in december






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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 11-5-2020 at 09:36 AM


Thanks for showing the latest. If it no too difficult, it would be interesting to see the tools you are using in this sometime. I'm thinking you are using quite a lot of special tools and equipment.



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abkayak


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[*] posted on 11-6-2020 at 08:56 AM


jantie...you would make a fantastic neighbor



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jantie


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[*] posted on 11-7-2020 at 03:48 AM


progress of yesterday:


made a drawing to see an calculate the angle of the bearinghead.
It's almost similar to the one of the Spider Crabbuggy, but he use a bigger tire and another rim.
79.jpg - 158kB


draw and grinding it fit.
90.jpg - 150kB
91.jpg - 112kB

welding and more grinding.
89.jpg - 179kB


cutting the 40mm to make the 34mm pipe fit
87.jpg - 133kB
86.jpg - 153kB

after measuring and setting it level in every direction,
ofcourse also a visual allignment...
85.jpg - 184kB


again welding, grinding and some spray-paint
84.jpg - 124kB

the complete axle
81.jpg - 200kB

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 Lathe/milling machine to make the ball-bearingheads.
80.jpg - 205kB

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






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







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[*] posted on 11-7-2020 at 05:30 PM


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.




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