SMALL - espritmodel.com SMALL - Telemetry SMALL - Radio
Reply
Thread Tools
Old Oct 29, 2013, 04:16 PM
Registered User
Joined Oct 2013
22 Posts
Discussion
reduction gears

Anybody know a good place where I can order/buy reduction gears for electric RC boats?
Sratch Builder is offline Find More Posts by Sratch Builder
Reply With Quote
Sign up now
to remove ads between posts
Old Oct 29, 2013, 04:21 PM
Veni, Vidi, Feci
patmat2350's Avatar
Motor City
Joined Dec 2004
12,710 Posts
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.
patmat2350 is offline Find More Posts by patmat2350
Reply With Quote
Old Oct 31, 2013, 08:39 AM
Registered User
Joined Oct 2013
22 Posts
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?
Sratch Builder is offline Find More Posts by Sratch Builder
Reply With Quote
Old Oct 31, 2013, 09:19 AM
Registered User
victoria, bc
Joined Oct 2003
777 Posts
I use the Robbe units - both 3:1 and 5:1, not sure how available they are at present.
mike_victoriaBC is offline Find More Posts by mike_victoriaBC
Reply With Quote
Old Oct 31, 2013, 01:05 PM
Registered User
linerfanatic's Avatar
Fort Wayne IN
Joined Aug 2007
242 Posts
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
linerfanatic is offline Find More Posts by linerfanatic
Reply With Quote
Old Oct 31, 2013, 04:23 PM
Registered User
Joined Oct 2013
22 Posts
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!
Sratch Builder is offline Find More Posts by Sratch Builder
Reply With Quote
Old Oct 31, 2013, 04:35 PM
Veni, Vidi, Feci
patmat2350's Avatar
Motor City
Joined Dec 2004
12,710 Posts
Nooooo! Anything but that Dumas junk! As pointed to above, there's lots of much better hardware available...
patmat2350 is offline Find More Posts by patmat2350
Reply With Quote
Old Nov 01, 2013, 07:53 AM
Registered User
Joined Dec 2004
3,820 Posts
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
frankg is online now Find More Posts by frankg
Reply With Quote
Old Nov 05, 2013, 09:26 AM
Registered User
Tollytime's Avatar
United States, MI, Macomb
Joined Nov 2006
1,309 Posts
Did you see this post?

http://www.rcgroups.com/forums/showthread.php?t=2028875
Tollytime is offline Find More Posts by Tollytime
Reply With Quote
Old Dec 04, 2013, 11:57 PM
Registered User
Saint John, NB(East Coast) Canada
Joined Apr 2006
198 Posts
Robbe GearSets

Quote:
Originally Posted by mike_victoriaBC View Post
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
Greg Hiltz is offline Find More Posts by Greg Hiltz
Reply With Quote
Old Dec 05, 2013, 06:31 AM
Boaters are nice people.
Sneek, Netherlands.
Joined May 2004
5,087 Posts
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.
pompebled is offline Find More Posts by pompebled
Reply With Quote
Old Dec 05, 2013, 10:33 PM
Registered User
Saint John, NB(East Coast) Canada
Joined Apr 2006
198 Posts
Motor options

Quote:
Originally Posted by pompebled View Post
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
Greg Hiltz is offline Find More Posts by Greg Hiltz
Reply With Quote
Old Dec 29, 2013, 08:45 AM
Registered User
Joined Oct 2013
22 Posts
Quote:
Originally Posted by frankg View Post
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!
Sratch Builder is offline Find More Posts by Sratch Builder
Reply With Quote
Old Dec 30, 2013, 09:30 AM
Registered User
Joined Jan 2013
59 Posts
Forget over priced hobby stuff, try the electronics market. as of this A M Electronics Goldmine has motors and gears and gear boxes..
Old Wood Boats is offline Find More Posts by Old Wood Boats
Reply With Quote
Old Dec 30, 2013, 09:50 AM
Straight up is all I ask
Fairfield Ct USA
Joined Apr 2002
2,323 Posts
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
jmolwitz is offline Find More Posts by jmolwitz
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Sold Gear Reduction Drives (GWS, Eflite, etc) & Venom Motors lafuerza Aircraft - Electric - Power Systems (FS/W) 2 Mar 27, 2013 09:55 PM
Sold Gear Reduction Drives (GWS, Eflite, etc) & Venom Motors lafuerza Aircraft - Electric - Power Systems (FS/W) 1 Mar 26, 2013 10:38 AM
Question Prop Reductions/Gears AirplaneFreak100 Electric Motor Design and Construction 14 Mar 15, 2013 07:35 PM
Sold Himax HA2025-5300, 5300kv & GWS 6:6:1 gear reduction $22 richman03 Aircraft - Electric - Power Systems (FS/W) 3 Mar 07, 2013 07:00 PM
Sold Scale Boaters! Gear Reduction Motorized Dual Anchor Mechanisim $20.00 stevster Boats (FS/W) 2 Jan 19, 2013 01:11 AM