Low price Catamarans

Hi all

Luigi you are right lets get back on track, as Albert said good promotional blurb, with a good explanation of torque and HP, but we are talking of a low cost cat which is subject to weight considerations, Volvo Penta genset, ouch, expensive parts, and we are adding more components and complicating the system somewhat, more things to go wrong. We are all different though and if thats what you want to do....... One thing I have an issue with if you are at low revs you have probably shut the throttle and don't want a lot of torque on the prop. 1800-2000 revs should give you 4-5 knots, if you want to go quicker then open the throttle if you can stand the noise. Each to his own, my own dreamboat if I had the werewithall would be a Folkboat, Bukh twin pot diesel 12HP, if the batteries fail to start the beast, pop down the decompression levers and wind her up. Wonder what it would cost in red cedar, *****, ***** *****!! Mind you I am an illogical guy with little imagination and happy with the tried and tested noisemaker to get in and out of harbour and then get the sails up. Wheres me armchair.

Amiconi or cronies?

the truth finally !!

******* Boats said:

Amiconi or cronies?

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I confess :

Mr. Graham , Also Concerned , is just a another RB Cronie !!!!!!!!!!!!!!!!!!!!


and too bad that i cannot find the pics of the lunch after the sea trial !! Unforgettable !

Warren is not only expert on props, he is also a big expert in biology/medical science!
http://blog.xtend-life.com/warren_matthews_blog/2009/2/12/irresponsible-doctors.html
What is your degree, man?

Alik said:

SPECIALLY FOR THOSE WHO CAN NOT READ:
Outboard's power is rated at about 80% RPM that corresponds to continous power. You can drive the boat at this RPM for considerable time.

Peak power of electrical motor is not continous power! You can not drive motor at this power excerpt for few seconds. Recommended power is 3kW - this is basis for any calculations.

Don't tell me about prop size/torque/power - You are absolute ZERO in these matters, You are not marine engineer to argue about that. Have You ever did propeller calculations Yourself? I know the answer - NO.

I don't care what is Lagoon doing, woud like to see the feedback (not promotional test drive from magazine) on real things.

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Alik,

Great job in promoting yourself to potential clients reading this thread. I am sure that they will appreciate your open-minded attitude and willingness to consider information from other sources in the marine industry. Only marine engineers need to be considered as your clients.

By the way the maximum continuous amps for the E3000 is 100. Try reading specs rather than headings.

In terms of feedback, I understand that the catamaran dive boat that you designed for use in Pattaya wallows like a pig and makes everyone seasick! Perhaps you are not as perfect as you would like to think.

RB PowerSailing said:

Cleaning the computer what i found just right now ?

A photo of Also Concerned , the day of the delivery of his boat !!!

and was an electric powered catamaran ! I don't know the power exactly , as we did not install the motors , but was running in calm waters at about 6 knts .

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Interesting about electric motors because it has outboards in the photo!

I understand from your spec it was supposed to carry a load of 2750kg but according to previous posts this would sink it! See posts #59, #83, #84, #87

khunian said:

Great job in promoting yourself to potential clients reading this thread. I am sure that they will appreciate your open-minded attitude and willingness to consider information from other sources in the marine industry. Only marine engineers need to be considered as your clients.

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We are open minded, unless we deal with self-confident diletantes which does not want to consider our experience and professional advice. No designer would accept this kind of customer. Often advice of naval architect can save the lives...

By the way the maximum continuous amps for the E3000 is 100. Try reading specs rather than headings.

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OK, You're making progress, before You said that You can run this boat at 200Amps Send inquiry to the supplier - they say they tested this device in swimming pool, at what Amps, how many hours? They recommend to run it at 40-60Amps - why? Can You run it at 100Amps for 8 hours?

Do You agree that E3000 motor matches 20/25HP diesel/outbard is fake statement? If yes, how You can trust rest of specs?

In terms of feedback, I understand that the catamaran dive boat that you designed for use in Pattaya wallows like a pig and makes everyone seasick! Perhaps you are not as perfect as you would like to think.

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Running out of arguments? Just wonder how You can get seasick with such undoubtable seagoing experience on 10m waves with 2m crest on 7m cat (BIG exaggeration, makes me smile)

We have positive feedback from the owner of this boat, due to his recommendations there were other few sisterships delivered You can see launching record of this model on builder's web.

For those who wants to see MSI/MIF seasickness factors for our cats - strictly in numbers, without bla-bla-bla - we can do the sea trials with 6-component acceleration gauge (I have this gauge, connected to computer for real-time record, we use it for sea trials) There are about 10 builders around the world building our cats now, different designs.

khunian said:

Interesting about electric motors because it has outboards in the photo!

I understand from your spec it was supposed to carry a load of 2750kg but according to previous posts this would sink it! See posts #59, #83, #84, #87

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This is the guy #1 who did not want to listern the advice, so we did not touch his project Study his experience with electrical motors
Read this - http://www.boatdesign.net/forums/hybrid/series-wound-dc-motors-23958.html what supplier's specs say and what he can get in reality.

ke somaro !

khunian said:

Interesting about electric motors because it has outboards in the photo!

I understand from your spec it was supposed to carry a load of 2750kg but according to previous posts this would sink it! See posts #59, #83, #84, #87

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But these outboards are hiding the electric motors ; Inside the cover , as you can see the cover is very big , as has been cut and extended .

The boat in fact was carrying 12 persons in the sea trials . perfectly on the waterline .

low free board as required by the expert Also Concerned


These pics prooved all , so seems to me . May be not enough for you ?


The payload and the displacement are 2 different thigs ; i know that this fact can be a surprise for you , but please believe me or ask around .

If you did see the specs supplied by Also Concerned , then , "what is written near near 2,750 kgs ?"

Amazingly for you , the boat can carry 24 persons and , what a surprise , don't sink !!

Ma vaffanculo , cretino .

In rather odd timing since I believe they (and others) have defended themselves strongly in the middle of this thread and it has taken a different direction today, we received the following message from RB PowerSailing just now:

RB Power & Sailing said:

Please notice that RB Power & Sailing Co.;Ltd. is filing some Court cases against defamators on your web site .

We kindly request the Administrator to shut off this thread or we will file a case against Boat Design . Net

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Our principle is that we cannot allow ourselves to be bullied by anyone or else it will become a slippery slope and the bullies of the world will put an end to free speech. The truth and the facts should prevail. We have been lucky to date in that the two previous companies who in our opinion have attempted to bully have gone out of business before we have had to commit resources to defend such actions. At the same time there are posts in this thread which (as many others have pointed out) should be taken with a definite grain of salt since posters have chosen to use aliases rather than their real names indicating a lack of confidence in their own claims. While I believe some interesting discussion and education did arise from this, I believe all the facts have been posted in this thread that will be posted, and so I will honor the request and close this thread. Please do not discuss this company any further on the forums.