I would think you have reached the "maximum" speed you can get in that configuration. The thing that's holding you back is aerodynamic drag, take a drive in the car and put your arm out the window at 80kmh and see how much air drag you have.....
To get more speed you need to get the airflow cleaner, things like a Lycra suit might help just a little bit, try a sailcloth skin from the pod to your shoulders/ backrest with just your head out. Think S-M-O-O-T-H AIRFLOW...............
The extra weight in the way of ballast would probably be a negative if your after speed.

Whilst the fastest I've ever been with a GPS on board is mid 70's, (in a production blokart with a glass mast and 4.0 metre sail and borrowed GPS) I know I can achieve in excess of 80 km. I now run a performance Blokart with carbon only in three sections on the 4.0 and two sections on the 3.0. I find this configuration of sail and mast suits my sailing style better and allows me a higher max speed.

Airflow and resistance are everything. I find that when I keep as low a profile as possible and sheet accordingly, even when others are hanging out of their blokart trying to keep all three wheels on the ground I usually make ground and pass if behind. This especially applies on a production blokart. With the performance kart it is probably more important given that the purpose of the POD is to aid aerodynamics and hanging out the side of it certainly doesn't help drag.

I recently flew, and I mean flew past one of our members who was clocking 69.4km on his GPS at the time. Both of us on 3.0 and he had a full carbon mast.

I don't know if any of this help and I certainly don't know the ins and outs of sailing or it's terminology but I do know that when I sheet my sail just right I can go like all hell. And Landyacht, not just downwind. I in fact find that I make the best time up on the competition when sailing upwind.

There are guys in our club who exceed 80 km on a regular basis in good winds.

P.S. I weigh 85 kg.

bryan said...

I've been blokarting for about 5 years now and have sailed in some very strong winds on Lake Lefroy.Using a 2m sail,ultra carbon mast, gps, and fitting a Pod I have not yet hit 80 kph.Can go sideways on 2 wheels at 65-70 kph which makes for fun sailing, but I want to get some higher speed, Im 84 kgs, would ballasting the yacht with sand bags improve my speed?

Hi Bryan, Yes adding ballast is one answer, but you would have to sail in 45-50 kts wind to get a better result. Very unpleasant sailing conditions in my opinion. Im afraid Bryan you may have out grown the Blokart experience and need to progress into a higher performing class of landyacht. There are plenty of options available. It all depends on... how fast do you want to sail?