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Hallo, den Hangkai habe ich auf eBay bestellt. Der Katamaran steht einstweilen im Garten und wartet darauf, dass ich wieder Zeit zum weiterbauen habe... LG Robert

Approx. 150kg

Hi, the Boat is a 1978 Moody 33. I will do a Video about it in the future. And yes, its sometimes fun and sometimes real hard work... if you need more infos i will try to answer it.

Thank you for your offer - i think you have a plan how to do this?

Well it will kill the motor - if you use it for a long time. When you use the motor at this higher voltage it will draw a lot more power. Thus the coils will get too hot, the insulation will melt and the engine is dead. But for a short time it will tolerate this. When cruising in the dingy, the engine will draw 150 or 200 Watt - the motor controller reduces the energy flow to the engine, so when cruising at 200 Watt the engine does not care if the battery has 48 or 60 Volt. If you use full speed, the picture is different. Some quick calculations: If you demand 1000 Watt at 48 Volt the engine will draw aprox 21 Amps (1000 W / 48 V = 20,8 A) hence the resistance of the Motor coils must be somewhere at 2,28 Ohm With this 2,28 Ohm: 60 V / 2,28 Ohm = 26 A ==> 60 V x 26 A = 1560 Watt (In reality the Voltages are higher in the beginning, since to Voltage of fully charged batteries is higher - both lead-acid and LiPo) So the motor draws 50% more energy and you really fell this in a increase of thrust the engine delivers. Some of this extra power is also converted into heat inside the motor - and as long as the temperature inside the motor is not exceeding the limits, the engine is totally fine with it. How long it will take until the engine overheats - i don't know because i don´t have the full specs of the engine and therefor could not do the math. For me this was more a "proof of concept" - could i use the tool batteries I a already own to run the engine? When operating the dingy I don´t use full trust anyway because it drastically reduces the distance I can travel; and using this small batteries at full trust i.e. 1500 Watt will deplete the batteries quickly - so the voltage drops, the ampere drops, the power drops, less heat in the engine. But i would not connect the engine to a big 60 Volt battery bank and run the engine for hours at full speed.

@@robertgrafl nice thanks for explaining. Im considering the Hangkai 48v 8 HP motor for my inflatable raft, hopefully its fast and fun!

@@robertgrafl do you think the electric motor in these could easily be upgraded to a 3000w motor or higher? I want big power haha

as long as it fits the shaft assembly it should not be a problem. Of course you have to change the controller too. I think the shaft is used by Hangkai up to 6 HP 4 Stroke - so it should be able to handle the power :-)

In terms of buying a controller how would go about finding a suitable one? What does it need etc

Wow - what a comment. I did it because it is my boat, I built it, I like to do it and if it's not working it it was my decision and my responsibility. So in that way you are right - a typical wharram owner...

@robertgrafl it is just this attitude that has given Wharram catamarans such a bad name in the yachting world. There are so many 2nd hand Wharrams out there that have been butchered by their builders - bits chopped off, bits added on, scantlings ignored, landlubbers wet dreams brought to life.... I've owned 3 and when built to spec and kept within their load limits, they are fast, responsive, seaworthy and reasonably comfortable. But, hey, like you said it's you're boat and building a boat obviously makes you smarter than the designer.

Hi Ron, since you are interested in this topic: I think wharrams are for a very small group of sailors. You have to have a very particular mindset to build one. I have build a Tiki 21 and this Tiki 31. I sailed the Tiki 31 in the Mediterrenean for 2 Summers. I startet to build this boat when i was 24 years old. It was great sailing - but i missed some comfort. Especially when it comes to bring your family on a longer trip. Selling the boat an buy a bigger one is a good idea. The only problem: There is almost no resale value on a 25 year old Tiki 31 - at least here in central europe. I could have sold it for less then a set of sails worth - maybe 5.000 Euro if i am lucky. Why? Because there are a lot of nice Monohulls on the market in the 10meter / 31 ft range which are sold for sometimes 10.000 Euros; And this Boats offer more comfort then the Tikis / Pahis in this range. And another important point: Keeping a boat in a Marina is expensiv. A berth for a 10 Meter boat will cost you between 3000 and 8000 Euro / Year. For a Catamaran 50% more. So you will pay 5.000 to 12.000 Euro / Year for the Tiki 31 just to keep it in a Marina. Thats more then the value of the Boat! So that is why i decided to modify the Tiki in a way i thought it will fit my needs: Make it comfortable enough for some months of cruising, bring it to the water, sail it and then bring it back again. If i had the money to buy and maintain a Tiki 38 or a Tiki 46 i would do so. But unfortunately i cant afford any one of them. And have Wharams a bad reputation in the "yachting world" - i dont know. Maybe somebody could leave a comment on this topic.

@robertgrafl G'day Robert. I appreciate your desire to sail further. The missus and I cruise the Great Barrier Reef as liveaboards on our 36 foot bridgedeck catamaran. But the fact is, you cannot cram a big dream into a small boat. We carry 150L of fuel, 85L of water (& a watermaker!), 3x3.7 kg lpg bottles, 3 weeks provisions, 100 kg of deep cycle batteries (lithium), an inflatable dinghy, bedding, tools, fishing tackle, anchors, chain, rope, etc, etc & the cats and there is only 2 of us and our biggest hop between ports is 200 miles. The load carrying capacity of a Tiki 31 is 1000 kg. That's dry weight - no engine, no fuel, no batteries, no toilet, no water tanks, no stove/gas, no ground tackle - and your boat has less now that you've added more structure. Two adults and 2 children with food and water and a bit just in case - how far can you go before you need to reprovision? Cruising the Med sounds comfortable; any further sounds like an ordeal. Monohulls are made for carrying weight; multis have to be large to come even close.

@@Ron-dx9wq Have you seen modification to Wharram where people add a cabin and remove the beam to transform it into a modern design? I think the open deck and the beams are increadibly wastefull in space and comfort and weight. They could be replaced by flooring and roof and some bulkhead like all the other cats. I had an iroquois, 32ft with 18" of draft and folding rudders and centerboard. It was great but a bit too small for a family. I am thinking of salvaging a Wharram and creating something more modern with a forward cockpit at the front of the cabin.

Actually i am more concerned about the extra weight in the front of the boat.... but yes, it ads some windage. But i am not so worried about that, since i avoid it anyway to sail longer legs against the wind - i prefer it to wait for a favorable wind. It may ad some more stress to the anchor - it would be interesting to make a calculation on how it really affects the handling ability of the boat.... thanks for your comment and fair winds.

The Tiki is still in my backyard. But i was to busy in my job to finish her for our sabbatical. There are some reasons why we had to do a year of sailing now - or never do it. So i bought a not to expensive 45 year old Moody 33. I love it to work on the Tiki - but its a project i do when i have spare time - which was not the case in the last years. And expenses you never count when you do a boat project - or you would not do it at all ;-)

I tried zip ties, for some parts they work. But i found out i can not arrange the sheets of playwood like i can do with copper wire. So i simply used what works best for me.

Thanks. I think a Pahi 42 will make a excellent cruising boat.

Hallo Andreas, der Kat ist leider noch nicht fertig, er steht noch im Garten. Es fehlte einfach die Zeit... Derzeit bin ich mit Familie auf einen längeren Törn - mit einer alten Moody 33. Schaukelt zwar mehr dafür schwimmt das Boot... lg von den Balearen.

Hey Mark, i just parked one hull at the Trailer to move it in the garden. When bringing the boat to the water i would bring each hull in a seperate lift. And assembling the boat on site is a lot of work as well. I took three days to have the boat ready to launch. So you definitely will not to this for a 2 week holiday....

@@robertgrafl thanks for the reply and good to know. Seems like a pain in the butt!

Der steht zu Hause im Garten. Leider fehlt die Zeit zum fertig bauen....

Yes, coming soon...

It's a little bit more noisy then let's say a torquedo - the engine is on top and there are gears. But the price is much less. And it is still less noisy then the best 4-stroke.

Weight on this boats is always a problem. The pod will be about 100kg more then the original configuration. I think the real problem is the lot of storage room in the pod... but since the pod is a seperate unit it is easy to remove and put back the original deck if it proves to heavy...

I estimate the extra weight at about 100 kg - empty. The problem is: it has a lot of storage room inside. And as we all know - this room will be used sooner or later.

my name is Ron it's a 10 horse electric 24v slash 48 / 60 volt thank you

Hi Ron, sorry for the late replay. Did you figure it out?

Yes there is a gear, and yes the Motor in a Pod would be more efficient. But compared with the well known brands this Motor is much cheaper. And you could use batteries you already own. If you like to play with stuff like this its a good choice. If you want a perfectly working system buy the expensive one. Hangkai just used a existing shaft and put an electric motor on top. A cheap controller and here you go. Not super efficient but very economic.

"Easy" is a relative term. If you know what you are doing, then the job at hand may be construed as "easy." On the other hand, it may not be so easy if you don't have a clue or possess the right tools. Since you felt it necessary to ask such a question, it's possible you may find things a bit difficult. This shouldn't deter you though. Your project may be a learning experience but will build confidence in your abilities as you tackle future projects. The first step is to get off the couch, start making sawdust, and don't worry about making mistakes (most can be easily corrected).

Did you make any progress on the Mana 24, am considering one.

No, i just had to pay the import tax, wasv all done by the shipment company.

Hey, if you can get this batteries very cheep or free its ok. But they are heavy and won´t last long. Better get a 48V liion on aliexpress....

Hey, i built this pack, because i already had the batteries from another project. Next time i would use something like this: de.aliexpress.com/item/1005003749363186.html?spm=a2g0o.search0304.0.0.4e4d6010ZbshJI&algo_pvid=d5d06ca5-62e7-4a76-84ee-a2b1bcec462c&algo_exp_id=d5d06ca5-62e7-4a76-84ee-a2b1bcec462c-16

Your kidding us right? We have so many lakes in Austria .... and people can swim like fishes ... lol

@Matt Fowler did you fix this?

@@dfgdfg_ no I ordered another one and it works perfect. I’m using 4 12 V deep cell marine RV batteries to make a 48 V bank for it and I can run my Jon boat all day with it