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Oct 29, 2013, 03:16 PM
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Discussion

reduction gears


Anybody know a good place where I can order/buy reduction gears for electric RC boats?
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Oct 29, 2013, 03:21 PM
Mmm, tugs...
patmat2350's Avatar
First, ask yourself if reduction is really needed... in many cases, there are both brushed and brushless motors available that will give the needed power at an appropriate speed in direct drive. This will always be cheaper, more efficient, more compact, and quieter if you can make it work.
Part of judging this is knowing your prop size (which leads directly to the appropriate speed requirement, see the chart in the article below), and the battery voltage you prefer to run on.

If gears are wanted: read my article:
http://matthewsmodelmarine.wordpress...all-geared-up/

Note that it's old and some of the recommended gearboxes may be hard to find, or there may be newer choices. If you're running the common 500/600 brushed motor size, then the Master Airscrew box is great if you can find it...OOP, so maybe ebay.
Oct 31, 2013, 07:39 AM
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Since I don’t build race boats, I have found in the past that gearing down most electric motors to a 2/1 ratio usually makes for a more realistic looking speed in work boats and most military ship models plus it increases motor power and reduces the prospect of over-heating and even conserves battery power. I haven’t found that the price of gear setups to be excessive. The problem usually is finding places where to buy them. Dumas orders in hobby shops seems to be the only option. I was just wondering if there were more places where they could be purchased?
Oct 31, 2013, 08:19 AM
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I use the Robbe units - both 3:1 and 5:1, not sure how available they are at present.
Oct 31, 2013, 12:05 PM
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linerfanatic's Avatar

gear box


With ten operational boats, I can only point to two that have any sort of gear reduction. One I would consider a success as it greatly extended my running time with no loss of performance. The other installtion may be a bit marginal. Run times are good, but the model lacks the speed and power to punch through choppy water. Props with more pitch might be used, but I have not found any with the correct diameter. So consider the need for gearing with some caution.

This is the gear reduction I used on a pair of 550 motors in one boat.
http://www3.towerhobbies.com/cgi-bin...&I=LXSL79&P=ML
I have another boat that has a pair of geared 400s I bought from this website.
http://www.maxxprod.com/mpi/mpi-10a.html
Oct 31, 2013, 03:23 PM
Registered User
One thing about gearing it’s pretty simple to undo a gear reduction at least for me as a scratch builder I always figure out how to make the entire main deck and super structure removable for easy access to running gear.

I know I can find gear reduction in my local hobby shop if I order it from the Dumas catalog. Looks like my only option.

Thanks guys!
Oct 31, 2013, 03:35 PM
Mmm, tugs...
patmat2350's Avatar
Nooooo! Anything but that Dumas junk! As pointed to above, there's lots of much better hardware available...
Nov 01, 2013, 06:53 AM
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SCRATCH BUILDER- May I offer you an optional Motor-Gear Box selection which was stated by Pat in his article, the M.A.C.K. Products Model #2041 Motor-Gearbox Combo.
http://www.mackproductsrc.com/Power%20p2.htm
Nov 05, 2013, 08:26 AM
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Tollytime's Avatar
Did you see this post?

https://www.rcgroups.com/forums/show....php?t=2028875
Dec 04, 2013, 10:57 PM
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Robbe GearSets


Quote:
Originally Posted by mike_victoriaBC
I use the Robbe units - both 3:1 and 5:1, not sure how available they are at present.
I'm in New Brunswick, sub-dealer for Lowell Briggs Hobbies in NS, he and I both have Robbe Gear cases and different gear sets for these, in 3.3:1 and 5:1
Dec 05, 2013, 05:31 AM
Boaters are nice people.
Hi SB,

I'm with Pat, if you don't need gearing down because the prop would be too large for the motor in question, don't.
If you use a motor like this:
http://www.hobbyking.com/hobbyking/s...ner_Motor.html
running on 3S (11,1V) gives you about 3500rpm at full throttle.

The motor mentioned is just an example, as you didn't mention which boat(size) you want to power.

Regards, Jan.
Dec 05, 2013, 09:33 PM
Registered User

Motor options


Quote:
Originally Posted by pompebled
Hi SB,

I'm with Pat, if you don't need gearing down because the prop would be too large for the motor in question, don't.
If you use a motor like this:
http://www.hobbyking.com/hobbyking/s...ner_Motor.html
running on 3S (11,1V) gives you about 3500rpm at full throttle.

The motor mentioned is just an example, as you didn't mention which boat(size) you want to power.

Regards, Jan.
Then of course, there are also the nice Johnson 970 motors, which come in two versions, the single shaft which run very high RPM and draw big amperage, or the double-shaft, 5000 RPM, high torque, low amperage draw, which do work well direct drive for larger boats. I have also converted windshield wiper motors, a Mitsubishi one and a couple VW(Bosch) motors which have two sets of brushes, giving two speeds, 3300 and 5000 RPM, 12 pole fine windings, great bearings and drawing approx. 1.8amp
Dec 29, 2013, 07:45 AM
Registered User
Quote:
Originally Posted by frankg
SCRATCH BUILDER- May I offer you an optional Motor-Gear Box selection which was stated by Pat in his article, the M.A.C.K. Products Model #2041 Motor-Gearbox Combo.
http://www.mackproductsrc.com/Power%20p2.htm
Hey thanks frank. I hadnít noticed or used M.A.C.K. products before. The gear reduction setups and prices look very interesting. Iíll have to add M.A.C.K. to my list of possible parts and materials list.

Thanks again!
Dec 30, 2013, 08:30 AM
Registered User
Forget over priced hobby stuff, try the electronics market. as of this A M Electronics Goldmine has motors and gears and gear boxes..
Dec 30, 2013, 08:50 AM
Straight up is all I ask
This has a few ratio's to choose from . Also they have a few others .
http://www3.towerhobbies.com/cgi-bin...?&I=LXSL79&P=0


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