Well Ian, in a very nice way I am saying your yacht is looking fantastic and will give any blokart a real good run for the money.
What is it's weight so far and how or where do you apply the brake from? (pic?)
Something to think of is having some way of restraining your feet and legs to keep them on board when you get hooting. If your foot bounces off the steering bar at 60-70kmh you could end up with it wrapped around the back of you neck. Ouch
.
If you look closely at the photos I posted of the blokart you will see the leg restraining straps each side from the mast step to the side frame. Very good idea and very handy as I often brace my legs against them to stop them bouncing around.
While on the subject of safety, PLEEEASE do not even think of going riding without a seat or body restraining belt. You are not likely to run into a brick wall on the beach so it is not to protect you from that.
It's main purpose is to keep you on board when (not if) you slap the yacht over sideways. When that happens it does so very quickly and suddenly. Early in the piece I rode my blokart without the seat belt on and that happened. I was lucky that I only had to have my arm in a sling for a week to allow my injured shoulder to heal.
When sailing my blokart I position myself forward and low down. The lower C of G is a secondary benefit. The main benefits are that it makes the seat belt a body belt as it then fastens over my lower chest where most of my body mass is, between my fat gut and fat head.
It also allows me to have my knees bent. If your legs are straight and knees unsupported, the bumps received travelling at speed in a kart without suspension put a lot of strain on your knees.
As a suggestion, for a static test on your land yacht prior to any sailing, do the following. Fully rig the yacht in your back yard, mount up and strap yourself in. Have somebody else pull the yacht over sideways by the mast till the point of balance is reached and hold it there while you get a feel for that position and the person measures the mast angle above the horizontal with a protractor level.
As a point of reference for you the blokart P of B mast angle above the horizontal is 30 degrees. If your angle is less, good, as it suggests that your yacht would be more stable (or stiffer in sailing terms) than a blokart, the opposite being converse.
When this measurement has been taken, have the person holding the mast let it go so that the yacht falls back onto it's wheels. See how you and the yacht feel about that as you will sometimes experience similar when sailing.
Next, have the yacht pulled over to P of B again and released to fall sideways. If the mast breaks, you needed a stronger mast anyway
.
Your first instinct or urge will be to put your arm out to break your fall. If you do that when sailing at speed the only thing you will break will be part of your body.
You need to overcome that urge and never put your arm out.
When you are in this position there a few things to look at. Firstly, are you going to crack or break a rib against your side struts or injure your hip on them??
Many blokarters add cushioning to their side struts by way of pool spaghetti floats or refrigeration line insulating foam.
If there is no issue with that and your body belt is well placed, you will notice that you are suspended somewhat uncomfortably, but none the less safely in something like a roll cage. So having slapped the yacht down sideways, avoided injury by keeping arms and legs inside the yacht and decelerated the yacht from 75kmh to 0kmh in about 1.5m, you then need to think about how quickly you can disentangle yourself unaided (as you are now 10klm up the beach), get the thing onto it's feet, pointed into the wind and back into the speed thing again.
The key point here is, how easy or hard is it to release your body belt buckle. Slackening it won't do you much good as it will still be holding most of your weight. The complete blokart seat/body belt arrangement is really good and may be your quickest and easiest option, however whichever way you go you need an easy release buckle.
The last two things to look at while tipped over are the ground contact points of your mast, as this is where you will tear holes in your mast sock on rough surfaces, and your foot steering bar. With your steering configuration I suspect you are going to have problems in that area when (not if
) you tip the yacht over.
Hopefully I am not appearing like a smarty pants or know it all here. As your yacht is so similar in size and configuration to a blokart I felt you may benefit from my experiences.
Yeppoon is looking good for this weekend and I'll call in to see Kody. His chassis should be just about completed by now if he has taken a break from feeding the local fishes ("I resemble that!!" says Kody
).
Via con Dios Amigos, till we meet again. Cisco.
I like the look of your "private" test site Ian. Is it bitumen or cracker dust? Whichever, when it gets windy, mast protector sleeves like they have for blokarts will be handy to save your mast pocket from shredding on the rough surface when you tip it over. You could make them from PVC or black poly pipe by cutting a split down the length and rounding the corners. The blokart ones are good and not too expensive at around $25-$30.
) more than welcome to come join in. Due to light winds and swirl it was hard to tell how it went but did manage to lift a wheel once. seemed to accelerate well, re-cut sail shaped reasonably, didn't have enough tyre pressure. For over 12knots probably too much sail area and at this stage slight wheel alignment touch ups needed (was already aware of this) will try to get some photos whilst sailed in anger 
but was at the far end by the time the shutter went off (pretty much dead centre of the photo), I'm sure you can relate to the problem. 
