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Structural limitations of a Lefroy Mini

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Created by lachlan3556 > 9 months ago, 1 Feb 2011
lachlan3556
VIC, 1066 posts
1 Feb 2011 5:41PM
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Hello everryone. Just thought I'd post a little info on a bit of a sail I had today at lunch time (I couldn't resist 30+kmh winds, although 40 degrees is getting a bit warm).


I ended up bending my fork and the two rear axles, both 30x30x2.5mm. Proud of me?

This said I can't say it was a normal session, I was using the Epsom-Huntly sports grounds carparks and road. Nearly all the turns under power had the wheels screeching and leaving black marks behind, needless to say the only way of turning in so little an area was to skid around a lot My first sail where I had to shuffle up the seat all the time to get enough mass over the front wheel.

With the wind as it was I it was impossible (for me) to make all the turns, and therefore went up over the angled concrete gutters a few times (read many times). My back has a resonably severve twinge in it at the moment, got a funny feeling that has happened before actually. May have to get some better seat foam.

Anywaaaaay, back to the moral of the story. Lefroy minis are not designed to be sailed over gutters too often, at highish speeds or you will bend them

Not that anyone should think that type of sailing might be ok






P.S. Still on the search for a good sailing venue locally, preferebly something like a big clay-pan. Pretty Please...

desertyank
1262 posts
1 Feb 2011 4:34PM
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NICE!

Oh well, repairs shouldn't be bad.....

Test pilot 1
WA, 1430 posts
1 Feb 2011 8:44PM
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Now is when we tell you about sacrifices! To get good wind conditions, in fact to get good 'anything' conditions one has since the beginning of civilised people, had to make sacrifices usually in the form of virgins preferably female.
So, either stock up on suitable sacrifices or run the risk of damged vehicles or no wind days [}:)]

Nikrum
TAS, 1972 posts
2 Feb 2011 9:19AM
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'tsa madda you Lachy?? Try looking around Lake Tyrrel or just past Horsham only a coupla hundred K's as the Crow flies.
Looking at that Box Section in your Steering It appears to be a little on the Light side to me. What is it?? 1.5 to 2mm walls? I think I would go for 4mm and also close in the end to give it a little more strength.
So what did you finish up calling you machine and I'm not asking the temporary ones you might call it if it Spits You out on the Bitumen.
Ron

cisco
QLD, 12337 posts
2 Feb 2011 9:24AM
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Tarmac is GOOD fun eh?

Like an old mate used to say to me "Let's take your yacht out sailing and see if we can break something."[}:)]

Nikrum
TAS, 1972 posts
2 Feb 2011 11:02AM
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Yeah! Well a Bloke I knew used to say a very similar thing--------Only he was offering a fight.. "RIGHT! Out there where the Concrete is nice and Hard"[}:)].

How do you guys get on with Front tires?? I think I will wear the Walls out before the central Tread.

Ron

lachlan3556
VIC, 1066 posts
2 Feb 2011 11:04AM
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Yes, I know beggars can't be choosers when it comes to sailing conditions and venues. The damage itself doesn't worry me (wont take long to fix), just thought I'd let anyone interested that the venue is a bit hazardous for sailing in high winds. It would be fun in low to moderate winds though Tarmac is good fun but not sure I can afford the tyres for it

I've been to lake Tyrell and sad to say it was very soft and is fed constantly with groundwater. The only time it may be ok is during a very hot summer, Im not sure what its current state is with the flooding in that area. All the Horsham area lakes are full so will have to wait quite a while for them to dry out

The front forks were to the lefroy mini plans,ie: 30x30x2.0mm (sorry, earlier I quoted 30x30x2.5mm). I'm sure they would be ok for normal hard use, i was just pushing the envelope yesterday. And forgot to sacrifice a few goats before heading out

No yacht name as yet, will get to it one day.

Test pilot 1
WA, 1430 posts
2 Feb 2011 2:59PM
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One of the reasons the front ends are not built heavier is that when some thing gives we would rather it be metal and not body parts. 3 times I have stopped suddenly with my front end and each time the shock to my feet and legs was uncomfortable but would most likely have been more distressing had not the front end given way in some form or other
Also keeps the weight down.

Chook2
WA, 1244 posts
2 Feb 2011 8:15PM
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By law, all modern vehicles require a crumple zone. You have complied!!!!!

landyacht
WA, 5921 posts
2 Feb 2011 9:01PM
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arn't you glad that the rear axles are just a little piece of cheap tube!. perhaps a piece of 25x25 into the fork to stiffen it it , maybe drill all the way through with one of ciscos hole saws i now have one maybe even a bit of that 25x25 in the axles.
ya must have flogged it

lachlan3556
VIC, 1066 posts
3 Feb 2011 10:45AM
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Flogged it is right! Went a bit crazy actually, not sure why I tried some of the things I did. Drilling all the way through is a good idea. Could also insert and weld a piece of flat bar diagonally into the warped tube to reinforce it.



This said I don't think anyone should do that kind of damage unless they crash.

If people want to sail over gutters/concrete objects, reinforcment probably is required (and thick seat padding)

Nikrum
TAS, 1972 posts
3 Feb 2011 12:26PM
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Lachy,
I can't say as I would try it.. Don't think the Back would stand the Jarring Shock, I probably would finish up in hospital.. Let alone a Life Ban, from sailing, by "Her what must be obeyed"
Ron

bazl
WA, 700 posts
3 Feb 2011 8:40PM
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I guess if the wheels weren't proven before then they must be now be considered toughies after that treatment

cisco
QLD, 12337 posts
4 Feb 2011 12:09AM
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I reckon they are a bit tougher than blokart branded wheels. Blowie wheels are brittle. Fallshaws have some flex.

lachlan3556
VIC, 1066 posts
4 Feb 2011 11:06AM
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I'd have to agree and say they look tougher, but they do feel fairly heavy. I sometimes think they could have some of the rim machined out and still be more than ok for mini use (especially the front). That said the little mass you would loose probably isn't worth the effort.

landyacht
WA, 5921 posts
4 Feb 2011 4:13PM
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tp1 has to hit solid fences and parked cars to replicate that kind of damage

lachlan3556
VIC, 1066 posts
6 Feb 2011 1:59AM
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Not sure why but I feel so proud!

Nikrum
TAS, 1972 posts
6 Feb 2011 2:14PM
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Lachy,
You can't leave a Child go unnamed and I just thouoght of a couple that may appeal;
1 Son O' Sam 666 (SOS)
2 Satan's Child
3 Beelzebub

Hey! Just a thought.
Ron

sn
WA, 2775 posts
6 Feb 2011 1:53PM
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how about a nice simple name like "BOUNCER"

iand
QLD, 243 posts
8 Feb 2011 12:59AM
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CAB (Crash And Burn)
But I can't talk, the first time I really opened up I lost control and hit a little puddle called the Pacific Ocean. But considering oceans cover the majority of the planet I feel it was unavoidable.

landyacht
WA, 5921 posts
11 Feb 2011 9:27PM
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I think that might have been the coral sea, the pacific is alot further out



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"Structural limitations of a Lefroy Mini" started by lachlan3556