'g" force

> 10 years ago
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beachball57
beachball57
SA
540 posts
SA, 540 posts
17 Jan 2011 9:40pm
well after getting the clearance from the doc to go "sailing" again finnally got out on the sand on the weekend and as i was rounding a mark that i had set up i wondered to myself what sort of 'g' force would be pulled in a tight turn at speed say 50 plus kph,, has nyone ever tried to record the g forces generated by a land yacht at speed in a turn maybe i should not be thinking of such things but i did..
bb
cisco
cisco
QLD
12365 posts
QLD, 12365 posts
18 Jan 2011 1:23am
Well "g" force is what we all secretly go out chasin' with this thing we do BB.

How much??? As much as we can get!!!

To date there are no known cases of landyachters passing out from it though except for those of us who have experienced the "g" of crashing into a brick wall at 60 or more kmh on a perfectly sublime beach.

It is not known how many have done this as no one ever tells of it. You can pick them though. Short stature and knees attached at the shoulder are a dead giveaway.
beachball57
beachball57
SA
540 posts
SA, 540 posts
18 Jan 2011 9:30am
that makes absoultly no sense at all
lachlan3556
lachlan3556
VIC
1066 posts
VIC, 1066 posts
18 Jan 2011 12:05pm
I think a couple of smiley faces would set the mood better reading Cisco's post
cisco
cisco
QLD
12365 posts
QLD, 12365 posts
18 Jan 2011 11:41am
Couple of ales helps too.
aus230
aus230
WA
1660 posts
WA, 1660 posts
18 Jan 2011 9:58am
From what I could find on Google, power boats in a tight turn at 50mph generate G force of 4.5, I think the turning circle would be similar
Cheers
Vic
kiwi307
kiwi307
488 posts
488 posts
20 Jan 2011 5:34am
IMHO if you are generating substantial G force you have to be scrubbing off speed. If you then take the view that you are trying to get around a course as quickly as possible, you do every thing you can think of to maintain the speed, so G is as small as possible.
Then again if you are just hooning generating G is great, but 720 degree spins are way more satisfying if you can keep on going at near undiminished speed
lachlan3556
lachlan3556
VIC
1066 posts
VIC, 1066 posts
20 Jan 2011 2:40pm
kiwi307 said...

...
Then again if you are just hooning generating G is great, but 720 degree spins are way more satisfying if you can keep on going at near undiminished speed


Hell, I'd be wrapped to do that without tipping over somewhere during!

As a note it would be cool to see a landyacht race televised with a speedo in the corner accompanied by a G force metre (ie: more G's means less efficient turns). Speaking of, I have to get out and build a camera mount sometime before the weekend
nebbian
nebbian
WA
6277 posts
WA, 6277 posts
20 Jan 2011 2:23pm
GPS Tracks can supply G-force readings

Reckon Landyacht might have a couple of tracks lying around that might be instructive...
Arjay
Arjay
VIC
267 posts
VIC, 267 posts
20 Jan 2011 5:33pm
50 kph/ 10m radius turn

about 2g

very rough and assuming heaps!
Test pilot 1
Test pilot 1
WA
1430 posts
WA, 1430 posts
20 Jan 2011 4:50pm
The way I look at it, to pull high G in a corner means you are not losing traction other wise you would be sliding and therefore G would be less. If you lose traction you are losing speed therefore(ergo) high G would = high speed.
This all assumes you are not tipping over instead!
bazl
bazl
WA
704 posts
WA, 704 posts
20 Jan 2011 7:02pm
lachlan3556 said...

kiwi307 said...

...
Then again if you are just hooning generating G is great, but 720 degree spins are way more satisfying if you can keep on going at near undiminished speed


Hell, I'd be wrapped to do that without tipping over somewhere during!



You need more practice lachlan
nebbian
nebbian
WA
6277 posts
WA, 6277 posts
20 Jan 2011 9:04pm
Road cars on tarmac will struggle to hit 1G lateral load. I've been in racing cars that do more, but they are special cases with very sticky tyres, not like a landyacht at all.

With your normal landyacht and a coefficient of friction less than 1 (as you would expect in normal sailing) I'd expect less than 1 G lateral load, no matter how hard you tip it in.
Gizmo
Gizmo
SA
2865 posts
SA, 2865 posts
21 Jan 2011 1:00am
Well here is a 360 Deg spin in a blokart .... but no helmet
port
port
VIC
446 posts
VIC, 446 posts
21 Jan 2011 1:39am
or shoes,pretty game or foolish i reckon.
blake52
blake52
123 posts
123 posts
21 Jan 2011 2:14am
I'm with nebbian; more than 1g seems really unlikely even on tarmac...spins are a different issue. Was there supposed to be a video there?
landyacht
landyacht
WA
5921 posts
WA, 5921 posts
21 Jan 2011 7:43pm
phhhh, he wasnt even sheeted in, i might have to send the kids over to show em how.
to get some good G you need a really grippy surface and then get the yacht to properly drift, say good clay or smooth tarmac , with the tyres smoking on the turns,
so how big is a G meter and how much and where do you get them. i will now go and have a look at some GPS
edit- oops , wifey has all gps on hers
but i can tell you that VINDICATOR has a 4 way harness , with shoulder straps because when you accelerate up from 85 your feet want to leave the stering pedals and it really cuts into the shoulders
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