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Messages - peterp

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#Following

I really liked the comment about getting the foil higher in water (I guess this has to do with decreasing drag of mast and/or getting foil wings nearer wave energy). When I do this I notice it has a huge benefit for wave riding. I notice it as more speed and glide. So I think my problem is not enough speed and glide.


The reason riding higher reduces drag is that the amount of water (density) above the foil is reduced. As the foil pushes through the water it pushes the water up and the closer the foil is to the surface, the less water it has to displace, before it is displacing air, which is obviously much lighter.

It's essentially the opposite of ground effect. If you have ever tried paddling a SUP in the shallows you will feel the SUP almost feels like it is stuck in mud. This because the water the SUP is displacing is being pushed down, and if it is shallow enough (there is a formula for this), then this water will bounce off the bottom and refract back up towards your SUP which slows you down. If you ever have SUP races with some deep and shallow parts, make sure to place yourself in the deep part and invite your competitors to place themselves in the shallow parts.......

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It's imminent. - In all the other sports; windsurfing, kiting, SUP - the carbon dollar quickly takes over.

Unfortunately, wing-foiling will require sub-1000sqcm wings which will be way to twitchy for the average guy to use.

We had a handful of fun races where the guys were on anything from 1000-2000sqcm, and the minute the guy on the 1000 started nailing his jibes, it was game over....

3
Random / Re: Home Theatre
« on: May 31, 2021, 12:35:12 AM »
Whoah!  Hold the phone.  Upon looking, one of the firmware updates added a smart function that lets you analyze your room by moving the remote to your common seating areas.  I did that and it really improved things.  Turns out that by default, dialogue is mostly centered in the stereo window.  We sit a bit to the outsides and it seems like we had been unknowingly minimizing the frequencies out there that we were looking to enhance.  Thanks for posting.  I would not have revisited this!

Sounds like (not to be punny), you sorted out the problem. I had similar experience where I could not make out dialogue and it was driving me mad. Looking at our room I realised big glass windows and tiled floors are basic acoustics worst enemy. Just as an experiment I scattered cushions all over the floor about 1m apart - what a difference! Don't under estimate sound deadening your room.

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Random / Re: Electric Surf Vehicles in 2020
« on: May 25, 2021, 10:24:38 PM »
Actually the companies most likely to kick ass in the EV business all have Chinese names that most people have never heard of. Its going to look and feel like Japan in the 70s. The USA and Europe have been ignoring the EV market too long. Most of the things that go into a US or Euro made EV come from china. Certainly the battery. There is no US company other than Tesla that builds EV batteries. Few that make a motor and control systems. Even the Japanese have just been toying with the category compare to the Chinese. I think there are about 600 car companies in China making EVs. Of those, more than a hundred are vertically integrated. None to the degree of Tesla, but youd have to be insane or flat out dumb to think China bent over backwards to accommodate Tesla for any reason other than to have a handy target.

Completely agree with this - I'm very surprised the Chinese haven't been more aggressive in pursuing foreign markets but maybe there are greater geo-political considerations at play. The biggest short term hurdle facing EV's is price - China has a knack for knocking out product cheaper than anyone else and seeing the effort they've put into the most expensive component (the battery) - they are surely lining up to steamroll the world markets? They have some tasty propositions already from BYD, Xpeng, NIO etc. But right now I'd take a Hyundai Ioniq 5 from next door - if only they were available here in South Africa. South African politicians have been bragging lately that South Africa has the highest proliferation of charging stations in relation to number of EV's of anyone in the world. We have one charging station for every 4 EV's (world average is 20). Which fades a bit when you realise we only have 250 charging stations......

5
Random / Re: Electric Surf Vehicles in 2020
« on: May 24, 2021, 09:37:04 PM »
Late to this thread, but I've put 105,000 miles on a Soul EV as my surf vehicle since 2015. So EV surf cars are already a reality.

Went and checked out the ID.4, Mustang Mach E, and Model Y last month. Any of those would be a good surf, SUP car.

As for EV's as power packs, here on Maui, we do get outages once a year or so. I've often looked at the battery pack in my EV, thinking it should get me through a couple of days of powering the house. So I got an inverter that clips onto the 12v battery. When needed, I just hook it up, turn on the EV and it'll power a few things around the house.

The F150 powering the house is a great killer app. Why pay the $10K for a powerwall when you can put that towards the extended range of the truck and get the bi-directional charger installed for free?

Our Nissan Leaf's 12V battery only gets power when driving - ie not from the 24kWh traction battery. It would run flat in about 10min if hooked up to the house. Looked at some commercially available bi-directional V2H options for the Leaf but they are prohibitively expensive - might as well just buy a freestanding extra battery - I only need about 10kWh to be off the grid 95% of the time. Our next EV has to have V2H built in or it will be off the list.

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Random / Re: Electric Surf Vehicles in 2020
« on: May 20, 2021, 01:36:38 PM »
It's very slick. If it's actually available before the cybertruck I will probably go for it. I really like my F350, but I bought that monster for the towing capability. Since I'm retiring from racing cars this year, after one last race at PIR this summer, I won't need as much towing capacity. But even if I did, the 10,000 pound capacity of the lightning with the big battery and tow package is enough to tow Nero, my airstream race car trailer with almost a full load, Including Peyote (the car, not the drug).

At $90K maxed out it's actually a bit less than I expected to spend on a Cybertruck. I know I sound like a huge Tesla fanboy, but really I'm an EV fanboy, and this truck looks like it will check all the boxes. It also will let me do something I was prepared to spend a substantial amount of money for--powering my shop independently of the grid with solar power. Grid independence requires a monster battery. I planned to do that this year by putting a salvaged Model 3 battery in one of the containers at my shop and adding a huge solar installation. I'll still do the huge solar project but I'll hold off on the battery since having one on wheels is a lot more practical than having one in a container. The full system would cost me in the neighborhood of $60K, and I can shave that to $30K if I wind up with a truck that provides the same power capabilities.

I think the importance of this is a little undersold. Alternate power is far more practical with local battery storage adequate to fully power a house at normal power use levels (about 3.5KWH per day as I recall). If using EV batteries as a power buffer becomes commonplace the utility and cost of independent power generation change dramatically. I think it's stupid that Tesla hasn't already jumped all over this, but they want to sell powerwalls. No one would buy a 10KWH powerwall if they could have their 90KWH Tesla serve the same function when it's parked in the garage.

Spot on - the V2H is a game changer for the EV and solar PV market - charge your car via your solar array and use the excess to power your home at night. Most EV's will only use 7-10kWh per day for normal driving - that leaves plenty to run your house overnight until the sun comes back to continue powering house. The fact that Tesla has been dithering on this is beyond me - their Powerwall is expensive and not that amazing. Tesla are serious laggards on this one.......

7
Foil SUP / Re: Downwind board size and shape. Using a paddle.
« on: April 18, 2021, 10:12:30 PM »
Frenchfoiler, it looks like you are on a similar page to KD Maui with regards to longer and narrower. The box in the pictures you showed seems very far back (or it could be the angle of the photo) and the rocker is flat behind the mast? Don't you find the flatter tail rocker a problem wrt take-offs the longer the board gets and how do you compensate for that?

Would you say this design would double up as a decent Sup-wave foil and wing board?

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Foil SUP / Re: The first foil ban?
« on: March 31, 2021, 05:32:13 AM »
Does anyone know if the Bondi Beach foil ban is still in effect and if it has spread to other locations?

9
One wonders how much of this has actually been prototyped and tested? It's an impressive line-up with lots of good ideas but personally I'd be a little cautious about spending cash on a possible CAD experiment.

Would be nice to get some more info on their product development processes.

10
Oh nice they fixed the loop leash attachment.  Imagine using a Lark's head knot for a surfboard or kite leash. Now if only I could find the secret dump valve on the strut of my 5m that they talk about on the website. ;D
Dumpvalve is there on all but the very first one shipped! I have a 6m without the dumpvalve as well.....I tried to justify it with the weight saving...didn't work.

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Airush have modified the leash attachment as per pic. You can now either hard-loop it or use the larkshead knot which admittedly only makes sense if you are switching the leash between wings as I've been doing.

12
Regarding the leash attachment in this wing, the recommended larkspur/knot is absolutely foolish.  It seems Airush got their inspiration from kite and bridle attachments.  It works great in that application where it is constantly under tension, but is terrible for a wing leash that is never under tension other than when the kite is flagged out on the leash.  My workaround was to feed the leash through the leash mount loop then larkspur it to itself. This will never come loose and fly away.  I can't believe Airush chose to use the setup they did.

Well I tried uploading a pic of my knot to this old forum, but nothing.happens when I do, so you will have to play with it until you figure it out, which isn't difficult.

Repeat: All you have to do with a larks head knot is pull it tight once....The guy at factory who assembled PonoBill's wing didn't and Pono Bill forgot to check it before pumping up - that's all there is to that story.

Where does this nonsense, that it only works on kites because its under constant tension, come from? When you attach pigtails to your kite there is absolutely no tension and if you forget to pull them tight before you leave your kite, to get to your bar, then yes, they might fall off, as kite is flapping in the wind before you get it launched....but that doesn't happen - if you just pull it tight, once...

13
I think Gong is paving the way for the more serious wing companies to come up with more specific designs - and good on them.

Wrt the quality issues, most the first gen wings from established kite companies have stood up pretty well as they have a lifetime of inflatable kite know-how built in to wings. But winging is creating new challenges as we pump and twist the LE's and struts way beyond what happens in most kites.

Exploding LE's is down to poor design, bad stitching, and in some cases, bladder actually rotating and scruffing against the LE and eventually wearing thin and popping.

14

The larks head connection is surely the simplest way way to connect a leash and if it was so terrible, I don't know how it has survived 20+ years on the kites???


Sorry, Im calling you out for that statement.

They work kiting, ONLY because the high loads LOCK the larks head. The leash has NO load to lock it in.

In fact, if you have kited for 20 years, you would know larks heads do release on brand NEW kites sometimes. Thats why some bridles have larks head locking plastic sleeves, like Cabrinha for example.
Clearly I must be doing something wrong  - never had one come undone, kiting or winging (since 1999), my bad.

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Foil SUP / Re: Takuma LOL v KUJIRA
« on: December 21, 2020, 09:13:20 PM »
Piros - not sure I'm understanding the effect of the shimmying you are doing? If you shimmy the mast-plate you change angle of attack in relation to board - I don't understand how this affects pump and glide once up and foiling? Unless it's to alleviate nose-down board or similar?

I know it sounds weird and I wasn't sure until I tried it myself. I'm talking about a 4-6 prone board not a Sup . I'm still riding the board flat , it does not trim the board when I'm surfing or gliding across a dead section my board is parallel to the water. Clay pretty well hit it on the head the pump ability just becomes so much easier and more lift on take off.  Cyril from Takuma says that angle at the board is better with a shim . You can find a more active position.

Ok - you are referring to the angle of the board in relation to foil. It can affect take-off (on SUP foilboards as well) if it is too nose-up the foil is actually pulling board down onto surface of water causing drag until you break loose and have lift-off. While in flight I find that balancing angle of board and swing weight can have quite significant impact on how the pump action translates into foil.

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