Class 5 alignment

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blake52
blake52
123 posts
123 posts
4 Nov 2015 10:01am
I feel like I may have asked this before...
I have heard repeatedly that in class 5, wheel alignment is critically important, and after watching the European class 5 guys fly past me like I was parked (I was actually going about 90kph) at the Worlds I feel like I am clearly doing something really wrong. So alignment is where I'm starting. I have never heard any agreement on the toe in (or out) alignment. For Camber, 15 degrees seems common. Because the wheels are cambered it seems like they would need to be toed out a bit to compensate for the camber trying to turn them toward centerline. At this point I have given up on the physics and just want to know what works for others. I am almost always running on a hard surface. Any feedback will be greatly appreciated. I currently run something close to zero toe.
Test pilot 1
Test pilot 1
WA
1430 posts
WA, 1430 posts
4 Nov 2015 2:14pm
if you toe in, turning right will fight the right hand wheel and left wheel will turn easily and vice versa. toe out , turning right - easy on right hand wheel fight the left hand wheel and vice versa.
no toe, no advantage or disadvantage.
camber helps where centrifugal force of turning loads outside wheel and assists in turning, also lifting a wheel then makes load \ed wheel run straight
blake52
blake52
123 posts
123 posts
5 Nov 2015 12:05am
so...zero toe is best? I understand about the camber. I've also been told that, on the beach at least, cambered wheels have a larger "footprint and tend to break the surface less.
Hiko
Hiko
1229 posts
1229 posts
5 Nov 2015 4:28pm
As far as I am aware zero toe in is the norm If there is some other idea thats better then its been something of a secret to most of us
Front to back trim can make a difference due to the camber so you want to set your wheels when the yacht is loaded
I dont believe a lot of camber is a good thing
Check to see if there is any change to toe in when you bounce the yacht up and down Twisting axles can affect it also if the geometry allows it
Making a simple wooden U bracket that will push on to your tyre with a hole that will accept one of those cheap laser pointers can give you a good tool for checking toe in

Most probably your speed issues lie elsewhere IMHO
landyacht
landyacht
WA
5921 posts
WA, 5921 posts
5 Nov 2015 7:18pm
gotta be happy with 90, you are playing in the big league. these guys would have been getting fussy over tyre patten,pressure etc , batten choice , mast choice..................
here on lefroy we have settled into about 8degrees of camber and no toe. i would load up the yacht when setting the toe especially if its an OTT with long rear axles on an angle .
our man chook has almost no camber and hes a winner
blake52
blake52
123 posts
123 posts
6 Nov 2015 4:50am
My mini is 5 degrees camber and no toe; seems less critical on the fat wheelbarrow tires (plus I have no adjustment on the mini). For the class5 I'll definitely will set the toe with weight in the boat. Mine squats quite bit, which changes the camber and toe both. Your class 5 in the picture sure looks like it has some camber.
blake52
blake52
123 posts
123 posts
6 Nov 2015 4:53am
I know big alignment problems make the boat horribly slow, but little ones may not make make much difference. There is always the pilot to consider. Who knows if I'm properly adjusted.
Test pilot 1
Test pilot 1
WA
1430 posts
WA, 1430 posts
6 Nov 2015 7:22am
ifn you're a landsailor you must be well adjusted
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