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Old Mar 30, 2009, 07:46 PM
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Jersey Shore
Joined Aug 2008
322 Posts
Build Log
ReVolt

Hi everyone . Well it seems my father is at it again . He seems to have thrown this Build into high Gear. Its a Mega Yacht and its BIG. Hes not looking for insane speed but scale speed i guess. Hes serching for power plant options . He wants to use a large 12 volt battery and one single Motor.
Her Name is ReVolt . We could really use some ideas for the power plant. We were looking at some really Nice Astro motors in a local hobby shop but the prices were outrageous . I had to share this build with yas , Revolt has some really nice Lines and before ya know it, she will be in the water.
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Old Mar 30, 2009, 07:56 PM
ΜΟΛΩΝ ΛΑΒΕ
graphixman's Avatar
Coastal Maine
Joined Jun 2007
856 Posts
Very nice! Graceful lines, and good subject. It'll look really nice in the lake.
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Old Mar 30, 2009, 08:24 PM
KC8WPF
CG Bob's Avatar
Euclid, Ohio, United States
Joined Sep 2004
3,723 Posts
We need to know the length, beam, draft, and displacement before recommending a power plant. Maybe one of the MACK Power Units would work.
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Old Mar 30, 2009, 10:18 PM
Keep it Simple, Make it Fun!
1Ironhorse's Avatar
Wichita, KS
Joined Jul 2007
212 Posts
I love the name! And that crew!

I'm guessing 45 inches and about 35 pounds?
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Old Mar 30, 2009, 11:39 PM
Boats on the brain!!
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Arnold, Mo.
Joined Jul 2005
4,534 Posts
I like the crew and for power, how about a Johnson 970.
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Old Mar 31, 2009, 12:37 AM
Boats on the brain!!
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Arnold, Mo.
Joined Jul 2005
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Also check into servo motors, not those little r/c ones but industrial sized ones. They come in all sizes and measured in rpm's per volt. The nice thing about them is that they are high torque and low current draw. I have one saved for a 60" tug that I have, it is 4-1/2" in diameter with a 3/8" shaft. At 7.2 volts and less than 1 amp draw, it will rip a 10" wrench out of your hand if you try to hold the shaft from turning.
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Old Mar 31, 2009, 01:56 AM
Grumpa Tom
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United States, CA, Los Angeles
Joined Sep 2003
22,904 Posts
Phil, times have changed. "Standard" sized servos now put out over 400 in/oz of torque.

423 oz/in Airtronics:

http://www.hobbypeople.net/gallery/474380.asp

425 oz/in Futaba:

http://www.gpdealera.com/cgi-bin/wga...pgm?I=FUTM0217

486 oz/in Hitec:

http://www.hitecrcd.com/servos/show?name=HS-7950TH

480 oz/in JR:

http://www.jrradios.com/Products/Tec...dID=JRPS8711HV

And lastly, if you really need some power!

http://www.servocity.com/html/spg795..._rotation.html
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Last edited by Kmot; Mar 31, 2009 at 02:12 AM.
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Old Mar 31, 2009, 02:19 AM
Boats on the brain!!
green-boat's Avatar
Arnold, Mo.
Joined Jul 2005
4,534 Posts
I realize that the current servos have got some umf behind them. I was refering to the servo motors themselves. The older ones can be gotten very inexpensively and are quite energy efficient. One of those bad habits that I picked up while away requires the use of 400 oz.+ servos.
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Old Apr 03, 2009, 12:15 PM
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Jersey Shore
Joined Aug 2008
322 Posts
I Just got back with the Specs on Revolt . Its 60'' long has a 15'' Beam and weighs 13 Lbs Hull and deck. The Hull can plain.
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Old Apr 03, 2009, 12:55 PM
Grumpa Tom
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United States, CA, Los Angeles
Joined Sep 2003
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Quote:
Originally Posted by green-boat
One of those bad habits that I picked up while away requires the use of 400 oz.+ servos.
Do tell! Perhaps a new thread?
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Old Apr 03, 2009, 09:33 PM
Boats on the brain!!
green-boat's Avatar
Arnold, Mo.
Joined Jul 2005
4,534 Posts
I wouldn't say a new thread but I have seen pictures of one of yours on here. I thought they were cool a couple of years back when I first saw them but just kept them in the back of my brain. Then I saw one of yours and that did it, now I have several and bodies for more. Oh, the 400 oz. servo is used for steering the tires around big rocks........




R/C Scale Crawlers.
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Old Apr 03, 2009, 10:01 PM
Grumpa Tom
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United States, CA, Los Angeles
Joined Sep 2003
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Crawlers. Understood.
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Old Apr 04, 2009, 02:34 PM
Registered User
United States, NJ, Frenchtown
Joined Mar 2003
9,056 Posts
2 big Pittman 12 volt motors. No planning.

Planning speeds are a lot of power even with the light weight.

I have a unused 16# Minnkota trolling motor that could drive 2 props with timing belts. That is what you are looking at.

Or 2 big low KV brushless motors & ESC's.
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Old Apr 06, 2009, 11:44 AM
Woodstain
St. Louis
Joined Oct 2005
93 Posts
Power Plant

Winkman, I have a motor that I believe will power your big boat, Email me for some pictures. The boat looks great!
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Old Apr 06, 2009, 04:14 PM
Registered User
United States, NJ, Frenchtown
Joined Mar 2003
9,056 Posts
Similar size

Look at the bottom shelf. You can see the fully interlocked frame & keel of a 60" Air Sea Rescue boat. It needs gobs of power to get on plane. Roughly 400 watts.
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