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Model Forum / Radio Controlled / Water Models / August 2004Electirc Motors
Hi All, I'm pulling an old electric model out of retirement. It's the Dumas 40 foot Coast Guard utility boat. It currently has a pair of Robbe 600's (I think, may be 700's or even 500's) can type motors with 3/1 gear boxes. Current speed control is the old Ace unit rated at 80 amps. I'd like to go with top of the line motors and batteries for max efficiency. So I'm wondering about the suitability of brushless motors and LiPo batteries. I'd also like to keep the ability to go into reverse as well. Any suggestions or comments? Thanks Chuck >Hi All, > [quoted text clipped - 10 lines] >Thanks >Chuck Hi Chuck While brushless would let you do without gears, especially one of the outrunner types they cannot be reversed as easily as a brushed motor. A brushless needs two of the three wires swopped to reverse the motor. I don't think any of the present brushless controllers have this ability. The only way I can think of for reversing is some form of a switch controlled by a separate servo to do this. Li Po batteries still need more careful handling than NiCd's or NiMH's. There are lots of warnings about hazards of LiPo cell in the aircraft groups. Best to stick to NiMH cells at this stage as cell weight in a boat is less critical than in an aircraqft. Jim Gill Dundee Model Boat Club http://www.modelboating.co.uk Jim, That's what I was afraid of. Rats! A couple of brushless would have been nice but reverse is a must. Well, maybe a couple of nice coreless with built in gear boxes. Have to see what the local shop has to offer. Thanks Chuck > >Hi All, > > [quoted text clipped - 27 lines] > Dundee Model Boat Club > http://www.modelboating.co.uk It's certainly not a problem to reverse a brushless motor - just get a controller that can do that eg: http://www.schulze-elektronik-gmbh.de/index_uk.htm Or you can build it yourself: http://www.geocities.com/SouthBeach/Port/1592/speedybl.htm Good luck Soren Denmark > Jim, > [quoted text clipped - 4 lines] > Thanks > Chuck Impressive to say the least! I can see where I'm going to have to spend some time going through these sites. Thanks, Chuck > It's certainly not a problem to reverse a brushless motor - just get a > controller that can do that eg: [quoted text clipped - 16 lines] > > Thanks > > Chuck ----- Original Message ----- From: C.O.Jones <ifyouneedit@yougotit.com> Newsgroups: rec.models.rc.water Sent: Monday, July 26, 2004 8:04 PM Subject: Electirc Motors > Hi All, > > I'm pulling an old electric model out of retirement. It's the Dumas 40 foot > Coast Guard utility boat. It currently has a pair of Robbe 600's (I think, > may be 700's or even 500's) can type motors with 3/1 gear boxes. Current > speed control is the old Ace unit rated at 80 amps. I have an old ace esc and can't find any info on it. Mine says: ET1210. Is yours the same? If so, do you have any information on how to use it? Thanks in advance... > I have an old ace esc and can't find any info on it. Mine says: ET1210. Is > yours the same? If so, do you have any information on how to use it? > > Thanks in advance... Hmmm! Not sure! Mine is currently in storage and I can't get to it easily. I recall mine is on a ckt board about 2x3 inches. No case, just the board and components. It does both forward and reverse. You turn the radio on first (TX and RX) followed by the speed control. And wherever the throttle lever is at time of turn on, that's where the speed control sets the division between forward and reverse. I'll keep you in mind and once I pull it out of storage, I'll take a look. Chuck Castle Creations now makes a brushless proportional reversing ESC. The Barracuda. You can adjust the amount of reverse relative to your stick movements in 10% increments. www.castlecreations.com For more affordable brushless motors, try the Nemesis line. They are Hacker knockoffs. www.finedesignrc.com or www.starluckrc.com I'd go brushless in my scale boats, but the thing that is holding me back is that no one makes a BL engine sound module. That's a great feature on my boats and I am unwilling to give it up. Hope you're listening RAM, Robbe and others. LOL > Hi All, > [quoted text clipped - 10 lines] > Thanks > Chuck |
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