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Old Jun 28, 2012, 01:12 AM
hotrod builder
usmc_VTOL_mech's Avatar
United States, TX, Arlington
Joined Jun 2007
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Hey guys look what I found

I found this boat on a local craigslist ad the other day. paid very little for it and was pleasently surprised it is actually a complete NIB unit with nothing I can see missing. The best of my knowledge these were produced somewheres around 1994. Now I am definately not the youngest guy here but during the 90's I had gotten out of RC and was busy in the service. it's actually kinda neat that it doesnt even use any kind of ESC...just a simple on off micro switch controlled by a servo.
Now the big question...do I keep it NIB or set this thing up with brushless and a lipo?
I don't think the plastic prop is gonna cut it if I do build it...
thoughts?
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Old Jun 28, 2012, 07:53 AM
"day ain't over yet-"
der kapitan's Avatar
Western N.Y. winemaking country
Joined Jun 2005
9,765 Posts
Nice find. Build it as is, because if you change to brushless, you may end up butchering it.
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Old Jun 28, 2012, 10:30 AM
AndyKunz's Avatar
Illinois
Joined Sep 2001
25,259 Posts
The ride pads on that hull (at least on the one I reviewed for a magazine) rolled upwards at the back. This sticks the hull down and makes turning, um, interesting. I recommend adding straight ride pads to it so it planes properly.

Andy
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Old Jun 28, 2012, 02:36 PM
hotrod builder
usmc_VTOL_mech's Avatar
United States, TX, Arlington
Joined Jun 2007
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Hi Andy. I would definitely be interested in reading that review If it is available? I have not really looked at the bottom of the hull, perhaps a pic would help? I can post one later tonight after I get home. Thanks for the input everyone
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Old Jun 28, 2012, 06:04 PM
AndyKunz's Avatar
Illinois
Joined Sep 2001
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It would be in RCBM from the early/mid 90's.

I wasted a lot of time trying to get it to work well with more power. In the end I pulled the systems out and mounted them in a converted MRP Bud hull that I ran for a while.

Andy
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Old Jun 28, 2012, 10:00 PM
Submarines, etc.
tsenecal's Avatar
Arvada, Colorado
Joined May 2005
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based on my experience in the late 80's with the MRP budweiser hydro, anything other than a variable speed esc will be a waste.
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Old Jun 29, 2012, 06:14 AM
Registered User
Blackpool, Lancs
Joined Feb 2006
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Quote:
Originally Posted by tsenecal View Post
based on my experience in the late 80's with the MRP budweiser hydro, anything other than a variable speed esc will be a waste.
Quote:
it's actually kinda neat that it doesnt even use any kind of ESC...just a simple on off micro switch controlled by a servo.
That was then, this is now. A forward only ESC to handle the current would probably be smaller, lighter and cheaper than a servo and a switch that could comfortably handle the current. Probably more reliable as well.
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Old Jun 29, 2012, 10:56 AM
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steamboatmodel's Avatar
Toronto, Canada
Joined Nov 2004
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The Micro Switches had a habit of welding close or burning out once you got the amperage up high enough to make the boat move.
Regards,
Gerald.
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Old Jun 29, 2012, 01:47 PM
hotrod builder
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United States, TX, Arlington
Joined Jun 2007
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Thanks for the input. I wasn't planning on using any of the electronics that came with the boat. I was thinking a 3600 kv in runner on 3 s lipo. Any thoughts? Should I try the stock prop or can anyone recommend a prop? One other question. Do most guys run a reversible esc or no?
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Old Jun 29, 2012, 06:47 PM
AndyKunz's Avatar
Illinois
Joined Sep 2001
25,259 Posts
Try 1500-1800kV instead, no more than 2300kV on 3S.

The guys doing real racing (like at the Nats last week) run 1800's on 4S and they're FAST.

Andy
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Old Jun 30, 2012, 12:04 AM
hotrod builder
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United States, TX, Arlington
Joined Jun 2007
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Andy thanks! I have a motor tht fits those parameters also. It might be a trial and error deal but at least it's easy enuff to swap out motors. I might be actually able to get started on it tonight
Thanks again
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Old Jul 12, 2012, 01:13 AM
hotrod builder
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United States, TX, Arlington
Joined Jun 2007
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Hi everyone
Little update...I went ahead and built this boat. went with a 3600 kv motor and a 120 amp esc. Runs good but the motor is too small..gets way to hot after 50 seconds of running. So I have a Neu motor I will be putting in and upping the voltage
But this was alot of fun so I went ahead and found the same version of this boat NIB but nitro not electric. So I will be doing that next after the motor and esc swap
Thanks for the help though...been a blast
here is a quick vid from the other day

http://www.youtube.com/watch?v=hTbjoB40Tmo
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Old Jul 12, 2012, 09:21 AM
AndyKunz's Avatar
Illinois
Joined Sep 2001
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The nitro engine was pretty good. I put a Mac header and pipe on it and ran it in a converted MRP Bud for a while. I think I eventually sold the engine to a friend. With the Mac system it ran a lot better than the stock muffler.

Andy
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Old Jul 12, 2012, 02:03 PM
hotrod builder
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United States, TX, Arlington
Joined Jun 2007
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Thanks Andy . I am looking forward to getting it built and seeing the differences in how the nitro runs compared to the electric? I am definitely not done with the electric. I see a ton of potential there. Is it true that I hear hydros always turn better left than right? Cuz mine turns great to the left but huge turns to the right. Also is there a good source for shaft adapters? The new motor I am putting in has a 5 mm shaft while the one I have now is 3.17. Either I gotta drill it out on the press or find another shaft adapter
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Old Jul 12, 2012, 03:09 PM
AndyKunz's Avatar
Illinois
Joined Sep 2001
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Adapters are relatively easy to come by. Check with the guys at www.OffshoreElectrics.com (up near Boston). They have a helpful forum there, too.

The truth about turning is based on the design of the hull. There are clubs that race turning left, but most others race turning right. A lot will depend on the prop type, depth, angle and the skid fin. Probably a better question is, "Are turns asymmetric?" to which the answer is almost always yes.

Andy
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