another newbie build!

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jifop
jifop
3 posts
3 posts
17 Nov 2009 7:03pm
hey guys! another newbie here based in the uk building a land yacht!

I'm basing this on your lefroy mini project designs and i'm not trying to variate too much but i have a few questions about suitable materials, unfortunately i'm not in a position to scrounge much in the way of materials so i do need to buy most things new!

my first question i regarding wheels! on ebay there are a few plastic type wheels available and i wandered which would be the best kind to buy? or if either is suutable?
i have been looking at the boat trolley type cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=270284420143
or barrow type http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=220482465484
would either of these be suitable?

for a mast and sail i have a windsurfer which i will use for now but will reshape as suggested on this site!

thanks guys and i look forward to getting started!
jifop
jifop
3 posts
3 posts
17 Nov 2009 7:49pm
I also have some materials questions, all the stockholders near me will only sell full lengths so i am going to need to buy online

for the main chassis tube which of these would you recommend?
Electronic Resistance Welded Tube;
38mm x 1.5mm
44.5mm x 2mm
50mm x 1.5mm
http://www.akmetalshop.co.uk/view_steel_range.php?range_code=ERWTR

For the mast tube i can get 60.3mm x 3mm Circular hollow tube which i assume would be ok? could i use this for the whole chassis?
www.akmetalshop.co.uk/view_steel_range.php?range_code=LRCHS

for the rear axles i can't seem to find 35x35mm hollow box section anywhere but i can easily get 40x40x1.5 and 30x30x1.5mm would these be ok? i guess i will have to shim the 30x30 for a tight fit but is that necessarily a problem?
www.akmetalshop.co.uk/view_steel_range.php?range_code=ERWTSQ

alternatively do the rear wheels need the extra camber or could i just use 60.3mm x 3mm for the whole thing? i real simple t shaped chassis with axles welded onto the ends?



hills
hills
SA
1622 posts
SA, 1622 posts
18 Nov 2009 8:33am
Welcome to the forum Jifop!!

I'll leave your questions to the experts, but keep us posted on your progress.

In the mean time have a look around other LLF mini builders threads and you might find some of your questions answered there.
Gizmo
Gizmo
SA
2865 posts
SA, 2865 posts
18 Nov 2009 9:32am
The wheels you mentioned...
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=270284420143


Are VERY suitable but dont forget to run bearings and NOT the nylon/ plastic insert supplied (send them an email to get some bearings to suit)
The smaller wheels are only good for sack trucks... not for land yachts

My suggestion for steel tube is dont go to 1.5mm if you have to weld it, 2mm or more is better unless you are a very good welder.
The slight angle on the wheels helps a little with cornering at high speed, if you did add more angle remember this will lower the yacht to the ground even further which might cause problems, if the surface you sail on will have grass or seaweed on it.
Contact the steel company for the 35 x35mm they might have small amounts around but not enough for a listing on the their site.
Hiko
Hiko
1229 posts
1229 posts
18 Nov 2009 10:12am
Welcome to the forum jifop
Sourcing the matierial can be a challenge without buying full lengths
I managed to get the steel for my mini from engineering shops and the main
spine is exhaust tube 51 x2 mm from an exhaust tube shop
Both of these places were willing to supply short lengths
As has been said anything less than 2 mm makes the welding more difficult
Good luck with the build
regards Hiko
landyacht
landyacht
WA
5921 posts
WA, 5921 posts
18 Nov 2009 8:01pm
agree with all the above, If you make the whole back end 60mm then it will be a bit stiff and not such a good yacht to sail( but it would work)
one of the big things we like about our minis is that they pack up smaller
you could pack the 30mm out with angled strips of 30mm to pack it out to fit the 40mm , that would work, but try to minimize the welding so you dont anneal it
get in touch with "responderman " another UK builder who is well on the way with his yacht( probably out sailing)
jifop
jifop
3 posts
3 posts
18 Nov 2009 8:10pm
thanks guys! i have had an idea on the wheel front, although more expensive i think i'm gonna go for these www.powerkiteshop.com/accessories/peterlynnwheelstandard.htm they are the standard wheels from a peter lynn kite buggy! i was looking at my mates one last night and figured they probably make sense!

i didn't realise the reason for the thicker stock was welding i assumed it was a strength issue! thankfully i am building a hotrod at the moment so welding 1.5mm is fine which will save me some weight!

i'm gonna take a trip over to see some engineering firms i used to use tommorrow and see what they have to offer in the way of steel!

again thanks for the help so far!
landyacht
landyacht
WA
5921 posts
WA, 5921 posts
18 Nov 2009 8:17pm
get the ones that take a 20mm bolt if you can. get 3 wheels as they will be perfect.
Hiko
Hiko
1229 posts
1229 posts
19 Nov 2009 5:12am
Those wheels and tyres with the 20mm bearings fitted look really good for a mini
to me
Not sure about 1.5mm steel might be a tad light around the mast step area but I
guess you could reinforce it around there and at the rear axle junction
Maybe someone else could comment here?
Cheers Hiko
responderman
responderman
82 posts
82 posts
6 Dec 2009 9:07am
Hi Jifop,
Im jay (responderman), also in UK, in Lincoln and also building an LLF mini, but things have ground to a halt at the moment. I ended up using street sign posts for my stock, and it seemed the best choice for me as I work for the council here. I also used peter lynn wheels, and they work very well. I once tried using plain wheel barrow wheels without bearings but they were awful! so use proper bearings in your wheels as already said here. My page is here,
www.seabreeze.com.au/forums/topic.asp?TOPIC_ID=54551&whichpage=-2#lastpost
If you want to get in touch feel free to PM me,
Speak soon
Jay
cisco
cisco
QLD
12365 posts
QLD, 12365 posts
6 Dec 2009 1:09pm
Welcome jifop.

Those Peter Lynn wheels should be perfect with 20mm axles.

My chassis ended up being made from 1.6mm wall material and I found 2mm welding rods were the best for welding with a fairly low amperage using a little portable inverter welder.

If you keep your welding arc fairly short with the 2mm rods you don't end up blowing too many holes in the material.

If you don't have a welder yet I highly recommend spending a little extra by buying a MIG welder. Better still if you can borrow one.

Lincoln Electric is one of the most highly respected names in the welding game. Their Power MIG 180C is an excellent choice capable of gas or gasless welding plus a spool gun for aluminium welding can also be bought. They retail in Australia for $1,200 so should be around 600 Pounds in the UK. Try www.lincolnelectric.com.au to have a look at it.

What ever you buy it is a good idea to buy from a dedicated welding supplies shop rather than an auto accessories shop. A welding shop should have a demo bay where you can try out the welders.

I didn't plan for my yacht to built from 1.6mm material. I thought I had 2mm.

So far it has proven to be quite strong enough and the yacht was built almost exactly to the plan. My personal variations to the building plan are being corrected except for the material weight. As Paul said when he saw it and had a sail "The 1.6mm material experiment has been done and it works."

If you build it exactly to the plan you will have a great yacht. Happy Building. Cheers Cisco.
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