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New RC boat build (Fountain)

Old 12-19-2010, 12:46 PM
  #61  
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I thought my 46" SuperG was FAST! LMAO! Turbine RC Boats are the shiz!

I havent even touched my SuperG in over a year after I capsized it. 2-Stroke motor isnt that much maintance but all the super fragile electronics are a pain!
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Old 12-20-2010, 03:12 AM
  #62  
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Originally Posted by cnvsback View Post
Wouldn't want this to fall into the wrong hands

http://www.youtube.com/watch?v=59ttSwYNspw
Damn, could use that deer hunting
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Old 12-25-2010, 05:12 PM
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ScarabChris,
Getting your thread back on track... Any progress on your build?
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Old 12-28-2010, 07:12 AM
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Well the scale looking outdrives were a disaster! The motors were way more powerful than I would ever imagined. Blew the gears in one drive pretty quick. Plus I couldn't get the boat to plane very well, the drives wouldn't fit big enough props.

So I'm back to the surface drive setup. I had to cut out all the mounts for the sterndrive setup and start from scratch. Had to patch holes in the transom, ect....



New motor mounts...


Current setup...






The boat is so fast with this setup that I can't even keep it in the water. On the first test run I got to about 1/2 throttle and what looked like 45 MPH, then stomped the throttle the the boat took off so hard that it got completely airborn. Blew me away!!!

The rudder is in a bad spot, steering sucks so I'm working on that and will get a video this weekend. I should also have my e-trex GPS in the hull for a speed reading. If I can keep the boat in the water I'm sure the speed will be 70+ MPH.

These electric motors have some amazing power, never would have though they were this strong. WAY stronger than any gas engine I have seen.
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Old 12-28-2010, 07:04 PM
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Yea sometimes that 'scale' stuff isn't the most durable.
You sure recovered well!

Curious... What makes that a bad spot for the rudder?
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Old 12-29-2010, 06:17 AM
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The rudder works at high speed but not worth a crap at low speed. Because the rudder is in front of the props it throws air into the props causing massive cavitation. And because its not in the prop wash it just doesn't turn the boat will unless the boat is moving at a good clip.

I am waiting on a new rudder that will place the leading edge behind the props, it should do the trick.
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Old 12-29-2010, 10:07 AM
  #67  
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Wow,I love the surface drives,looks mean. That boat has a nicer bilge than most real production boats.

What kind of run time are you getting?
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Old 12-29-2010, 04:15 PM
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First test which was multiple back and forth high speed runs but few were at full throttle. I looked at my watch and I was running the boat a good 10 minutes. Thats with one battery per motor. I have the ability to run two batteries in parallel per motor which won't increase the speed but will double the run time.

I was testing with one pack per motor because I was afraid the extra weight would slow it down. Not the case, the boat needs the extra weight...LOL

I think with 4 batteries total I should get an honest 15 minutes run time with mostly high speed running.
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Old 12-29-2010, 11:04 PM
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Hi Chris; as you probably know as have started a thread I am building from scratch quite a behemoth with some resemblance to yellowfin hull
more precisely this big :
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Old 12-29-2010, 11:20 PM
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sorry for the interruption .... I would really want to power it with a three large outboard set up, if neccessary, using three gas outboard complete lower units but with a large brushless in the place of the gas motor maybe like the one in the pic at the bottom of this text.

I have followed your advise to contact offshorelectrics.com for advise but Mr Steven Vaccaro apparently the person responsible of the technical advise is not very willing to do his job since he never answers to my questions just as if he does not read the questions before answering maybe you can give me your opinion ( or maybe convince Mr Vaccaro at offshorelectrics to work a bit for his potential customers)

But I am not sure which motors should be used or if at all feasible with electric power, they have quite large electric brushless motors in their webpage and if not possible with outboards I might be interested in trying inboard brushless like your project but I am in need for some advise in regards to which motors, feasibility .. maybe you can give me your opinion about it since to get a reasonable answer from offshorelectrics is becoming some kind of impossible ....
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Old 12-30-2010, 06:57 AM
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Yes I have been following your build. Very nice! I think your biggest problem is going to be finding outboards that big that are scale looking. The gas outboard you have pictured above will work and I believe they make little Mercury cowlings for them. But what pain in the but to get three of those started.

I would explore the brushless motors a little further. No doubt there are big enough brushless motors to push that boat. My 54" Fountain has two Leopard 5692 (1340 Kv) motors and the boat is so fast its hard to keep it in the water. The boat would have done 50 MPH with one of these motors.

If you can find big enough lower units to house those 5692 Leopards I would go that route. That model is big and will be heavy and three of these motors should push it to 50 MPH if you can get big enough lower units and props. Then you can custom make Mercury or Yamaha cowlings for them for the ultimate scale look.

Strange what you say about Steven at OSE. Where are you sending the questions? He has always been very prompt with my questions even before I bought anything.

You should sign up at the forums at Offshore Electrics and post your project in the "boat building" section. The people would get a kick out of it and will also offer advise on power.

I also built a replica of my real boat, this was my first electric build. See it here.....

http://www.thehulltruth.com/boating-...e-bracket.html

In this build I bought the little scale outboards first then found a hull that matched in scale size.

Last edited by ScarabChris; 12-30-2010 at 07:10 AM.
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Old 12-30-2010, 11:06 AM
  #72  
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Now thats a rudder! And it works great, turns on a dime at any speed. Now I can finally wrap this thing up.

Got a guy working on a sweet wrap for it instead of painting it.
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Old 12-30-2010, 10:59 PM
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Mega nice hardware ........ are those MTC marl huls from germany stuff ?? look like if they could fillet a swimming by cuda in seconds ...... in regards to Mr steven Vaccaro at Offshore electrics I believe he is not doing his job very willingly, when you ask him three questions he answer one and vaguely I would be very surprised if he is the owner of of the business more of an irresponsible employee attitude its like if you ask someone what´s the time and the reply is: sunny or when you ask someone about the weather and the reply is three o´clock ..........

without any willingness to hijack your nice thread check for yourself: four days to let me know I need to make some motor mounts if I decide to go electric and no answer to my main questions in NO way I could order any stuff from a such a fool see for yourself:

Monday:
Me: Subject:I would like to power with outboards a quite large model of my own design in the neighborhood of 25 pounds of weight and 6 feet long x 1.5 feet wide, it should become a testing prototype for a real size boat
and I do not know if your outboards lower units even the largest like your hpi-3.5-bullet-drive even using three of them would be up to the task of moving my rc behemoth please check this link to a forum where I regulkarly
contribute to take a look to what I am talking about
http://www.thehulltruth.com/boating-outdoor-photos/315635-build-yellowfin-1-5-scale-model-2.html

any reccomendations for such a boat ??


Tuesday:
You need much larger outboards. Contact hyperperformance products for 7.5cc outboards.

Thanks Steven Vaccaro Offshore Electrics Inc www.OffshoreElectrics.com

Me: And what would be your advise for powering with two inboard brushless, Price is no objection and I have seen in your web page quite large motors like your largest leopards or Neu or Castle Creations ........


I also believed that a large brushless could be used with a high quality lower unit for gas engine like for example please see attached picture

If outboards could be used I am ready to buy THREE units off them why do you think is not feasible?

regards your potential customer Jose m.


I’m sorry, I see a picture of a gas outboard, but no question?
Thanks Steven Vaccaro Offshore Electrics Inc. www.OffshoreElectrics.com
Wednesday:
Me: I can not understand what happened but the text was sent with the outboard pic here is what it was missing:
And what would be your advise for powering with two inboard brushless, Price is no objection and I have seen in your web page quite large motors like your largest leopards or Neu or Castle Creations I also believed that a large brushless could be used with a high quality lower unit for gas engine like for example please see attached picture
If outboards could be used I am ready to buy THREE units off them why do you think is not feasible?
regards your potential customer Jose m.
You would have to make or have someone make some sort of mount to mount the motors on.
Thanks Steven Vaccaro Offshore Electrics Inc. www.OffshoreElectrics.com
Thursday:
Me: Sir, as you surely know , in NO way you are answering my questions ............ have you read my mail ????? because it would be fairly convenient particularly considering I have been 3 days waiting for your absurd answer.
here you have them AGAIN for just in case you are willing to read them before answering on this ocassion
question 1: And what would be your advise for powering with two inboard brushless, Price is no objection and I have seen in your web page quite large motors like your largest leopards or Neu or Castle Creations ........
question2: I also believed that a large brushless could be used with a high quality lower unit for gas engine like for example please see attached picture
question 3: If outboards could be used I am ready to buy THREE units off them why do you think is not feasible?
Despite your unwillingness to work still your potential customer Jose M
PD: I am asking for the techical suport that is advertised in your web page, my questions have been precise your answers have been from vague to non existant you do not want me to publish the content of your "work" in the forums do you ?? ....... do your job then and do it good.
Friday:
I thought I did answer your email. Thanks for the very “rude” response. You asked
“If outboards could be used I am ready to buy THREE units off them why do you think is not feasible?”
And I answered the question.
You would have to make or have someone make some sort of mount to mount the motors on.

THIS IS STEP ONE.
IF YOU DO NOT HAVE THE TOOLS TO MAKE THE MOUNTS TO FIT ELECTRIC MOTORS to the gas outboards, than there is no need to move on from there.

Thanks Steven Vaccaro Offshore Electrics Inc. www.OffshoreElectrics.com
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Old 12-31-2010, 08:43 AM
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Quick video, it sucks because I was alone so I just set the camera on the lean post of my boat. You are only seeing slightly over 1/2 throttle. I am having one of the ESC's shut down at full throttle from heat, need to look into that.

Highest speed recorded with the GPS was 47 MPH. If I can keep the ESC from shutting down I see no reason this boat won't hit 60.

The new rudder works great, the only thing I need to figure out now is the over heating ESC. Maybe to much prop or I need higher amp ESCs.

I'll get a better video Sunday when I have someone on the boat with me to shoot it.
http://www.youtube.com/watch?v=y1ButlxANBQ
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Old 12-31-2010, 09:24 AM
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Very cool.
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Old 12-31-2010, 09:25 AM
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Originally Posted by CANARIANFISHER View Post
Mega nice hardware ........ are those MTC marl huls from germany stuff ?? look like if they could fillet a swimming by cuda in seconds ...... in regards to Mr steven Vaccaro at Offshore electrics I believe he is not doing his job very willingly, when you ask him three questions he answer one and vaguely I would be very surprised if he is the owner of of the business more of an irresponsible employee attitude its like if you ask someone what´s the time and the reply is: sunny or when you ask someone about the weather and the reply is three o´clock ..........

without any willingness to hijack your nice thread check for yourself: four days to let me know I need to make some motor mounts if I decide to go electric and no answer to my main questions in NO way I could order any stuff from a such a fool see for yourself:
The drives are MTC power trims sold by MHZ in Germany. The hull is made by Bonzi Sports here in the USA.

As to Steve at OSE, his job is what he makes it, the RC boat website is a hobby that turned into a part time business. I think the main issue is your model is much bigger than anything he can supply advice or parts for (except for the motors) But without knowing the details of your particular hull he can't offer advise on any motors or drive hardware.

Lets say he takes a shot in the dark and sells you $1000 in motors and hardware and then it doesn't work. How unhappy would you be with him then?

That would be like me going to an Evinrude dealer and saying I want 2 outboards to make my boat go 50 MPH but the dealer doesn't know anything about my boat.

When you scratch build an RC boat finding the right power and making it work is trial and error. Look how many holes I had to drill and fill in this 54" hull to get it right.

I think you will need to complete the hull first then find the correct power. But from what I can tell your hull should work well with the hardware pictured above on my boat. Though I would go with triple motors and drives. The only issue I have with that is the scale factor. You're spending so much time and money to replicate a 36 Yellowfin that it would be a shame to not have scale looking outboards. Unfortunately your hull is so big I don't think there are any outboards that will fit to scale.

What is the length, beam and freeboard of the hull? I'll see what I can find out.
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Old 12-31-2010, 12:10 PM
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Very cool, nice work!!!
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Old 12-31-2010, 12:15 PM
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Thanks!

I have a guy making a wrap for the boat like this. I know....not original but very cool looking. And if I get board of it I can always peel it off.
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Old 01-01-2011, 02:39 AM
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Hi Chris, in regards to the scale looks of the outboards my opinion now is that I would need to use three lower units made for a gas outboard like the one pictured and then adapt a leopard or neu or indeed one of the many giant brushless out there ( like any of the ones capable of pushing the 6 feet mystic catamarans. then maybe a scale mock up outboard head could be made.

But I asked the guy at ofshorelectrics about advise for a non outboard set up similar to yours (for nothing) then the scale looks or outboard looks could be obtained again with some mimick outboards top.

Anyway still in doubt about using electric power we might favour a large twin cylinder blata with aproximately 20 hp and electric remote start that could well do the trick
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Old 01-03-2011, 05:43 AM
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Nice work Chris, that looks like fun! You're gonna have to bring that along next time we meet up
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