HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Mar 09, 2005, 05:33 PM
Star Line Hydro-Jet Ferry
Jeff G's Avatar
Dearborn Heights, Michigan
Joined Feb 2005
234 Posts
Jersey City Motors

Is there a motor that can be used as the one for the Jersey City, other than the one that costs so much made by Dumas?
Jeff G is offline Find More Posts by Jeff G
Reply With Quote
Sign up now
to remove ads between posts
Old Mar 09, 2005, 05:51 PM
Veni, Vidi, Feci
patmat2350's Avatar
Motor City
Joined Dec 2004
12,709 Posts
Go geared!

I've said it before, and will continue to preach this: You're better off with a small fast motor geared down than a big expensive slow motor. I use a big Graupner 7.2v Speed 600 with the Graupner 3:1 reduction on 6v in my Seguin, and it's too much power (and it's VERY quiet, thank you...). You'd probably have great scale performance with a Speed 400 and about 3:1 reduction. Look at the gearboxes available through www.hobby-lobby.com, especially the planetary units... I run one in my DUKW, and it's SILENT.
http://hobby-lobby.com/gear400.htm
$10 for the Speed 400, $30 for the gears.

Pat M
Go to the Regatta!
http://michiganmodelboats.com/2005GLSMBSR/
patmat2350 is offline Find More Posts by patmat2350
Reply With Quote
Old Mar 09, 2005, 06:22 PM
Registered User
P. Tritle's Avatar
Albuquerque NM
Joined Oct 2003
8,513 Posts
My favorite geared combination is the Dumas 6V high speed with a Master Airscrew 2.5:1 drive for a total cost of around $40.00. The only catch is that you'll have to drill out the u-joint cup to fit the larger ouput shaft on the drive unit. Otherwize, it drops right in. And the best part is that at normal cruise, it draws less then 2 amps.
PAT
P. Tritle is offline Find More Posts by P. Tritle
Reply With Quote
Old Mar 09, 2005, 06:29 PM
Mostly harmless
Capt_Christo's Avatar
Sydney, Australia
Joined Feb 2005
382 Posts
Hey Pat,

That combo of the Dumas 6V and the Airscrew, How big a hull could you drive with that?

Cheers
Capt_Christo is offline Find More Posts by Capt_Christo
Reply With Quote
Old Mar 09, 2005, 06:37 PM
Star Line Hydro-Jet Ferry
Jeff G's Avatar
Dearborn Heights, Michigan
Joined Feb 2005
234 Posts
How do you install a gear reduction box like Pat M. suggested? Ive never done that before.
Jeff G is offline Find More Posts by Jeff G
Reply With Quote
Old Mar 09, 2005, 06:54 PM
Veni, Vidi, Feci
patmat2350's Avatar
Motor City
Joined Dec 2004
12,709 Posts
Look at the picture in the link. The planetary mounts just like a plain motor, with 2 screws. The motor attaches to the gearbox very easily.
Pat M
patmat2350 is offline Find More Posts by patmat2350
Reply With Quote
Old Mar 09, 2005, 07:07 PM
Registered User
Monterey Bay California
Joined Feb 2004
14,151 Posts
I've been thinking about adding a workboat like a tug to the fleet (Jim Wilder comes to mind) but have been put off a little by the investment in equipment which doesn't fit in with the rest of the 'fleet', like 12 volt batteries and chargers, big motors and big speed controllers, etc. by going to S400-600 on gearboxes, you guys can run 'normal' ESC's on NiMH cells sucessfully in these heavier boats? what kind of run times are you seeing? I know, "milage may vary"
Aerominded is offline Find More Posts by Aerominded
Reply With Quote
Old Mar 09, 2005, 07:23 PM
Star Line Hydro-Jet Ferry
Jeff G's Avatar
Dearborn Heights, Michigan
Joined Feb 2005
234 Posts
Quote:
Originally Posted by patmat2350
I've said it before, and will continue to preach this: You're better off with a small fast motor geared down than a big expensive slow motor. I use a big Graupner 7.2v Speed 600 with the Graupner 3:1 reduction on 6v in my Seguin, and it's too much power (and it's VERY quiet, thank you...). You'd probably have great scale performance with a Speed 400 and about 3:1 reduction. Look at the gearboxes available through www.hobby-lobby.com, especially the planetary units... I run one in my DUKW, and it's SILENT.
http://hobby-lobby.com/gear400.htm
$10 for the Speed 400, $30 for the gears.

Pat M

Go to the Regatta!
http://michiganmodelboats.com/2005GLSMBSR/
What items should I buy from the page linked above?
Jeff G is offline Find More Posts by Jeff G
Reply With Quote
Old Mar 09, 2005, 08:06 PM
Veni, Vidi, Feci
patmat2350's Avatar
Motor City
Joined Dec 2004
12,709 Posts
Well, a lot of possibilities...
The Speed 600 GR179530 is what I have in the Seguin... guaranteed to be enough power and more.
The MJ8053 planetary gearbox for a 500 motor could be mated to any 500/550 size motor.
The MJ8050 planetary for 400 size motors MAY do the job... but no guarantee. About the same price as the 500 gearbox, so that might be safest.
Go to http://hobby-lobby.com/contents.htm to see their index, see under "Motor w/ gearboxes"
Pat M
patmat2350 is offline Find More Posts by patmat2350
Reply With Quote
Old Mar 09, 2005, 08:43 PM
Star Line Hydro-Jet Ferry
Jeff G's Avatar
Dearborn Heights, Michigan
Joined Feb 2005
234 Posts
Still a bit confused. A few questions:

Installation of a motor to gearbox- Is the motor shaft inserted into something on the gearbox, and a shaft runs off that??

Whats the difference between a 3:1 gear ratio to a 2:3 or one with 3 numbers like 3:2:1?

Whats the difference in a Speed 400 from say a speed 600?

Thanks, Jeff
Jeff G is offline Find More Posts by Jeff G
Reply With Quote
Old Mar 09, 2005, 09:06 PM
Veni, Vidi, Feci
patmat2350's Avatar
Motor City
Joined Dec 2004
12,709 Posts
Gearbox has instructions, it's no sweat. You might have to dremel off a bit of the motor shaft to fit if you don't buy an assembled set.
Can't say which ratio will be best for your prop/motor/boat combination, but close to 3:1 is a good bet.
Check those numbers again... you're probably looking at something like 3.83:1 . Just means 3.83 motor revs per 1 output rev.
Pat M
patmat2350 is offline Find More Posts by patmat2350
Reply With Quote
Old Mar 09, 2005, 10:20 PM
Star Line Hydro-Jet Ferry
Jeff G's Avatar
Dearborn Heights, Michigan
Joined Feb 2005
234 Posts
Thanks Pat, lots to think over.
Jeff G is offline Find More Posts by Jeff G
Reply With Quote
Old Mar 10, 2005, 02:47 AM
Useful Idiot
Asturias, Spain
Joined Mar 2001
3,546 Posts
A couple of points. Spur wheel and pinion gearing reverses shaft rotation. This isn't usually a problem for cheap motors but some special car motors are timed to run better one way than the other. Otherwise it's just a question of reversing motor polarity. Planetary and belt drives don't reverse rotation.
Mabuchi and Johnson 500/600 size motors sometimes turn up very cheaply on ebay and other on line sources.
A google search for "gearhead" came up with http://www.robotstorehk.com/mech.html Some of the gear ratios produce very low rpm - too low for most boat use but, as mentioned earlier, up to 3:1 or even 5:1 reduction is a useful figure.
martin richards is online now Find More Posts by martin richards
Last edited by martin richards; Mar 10, 2005 at 03:38 AM.
Reply With Quote
Old Mar 10, 2005, 09:19 AM
Registered User
P. Tritle's Avatar
Albuquerque NM
Joined Oct 2003
8,513 Posts
Capt, I'm using the MAS geardrive units in 33" trawlers with excellant results. Cruise is typically around 1/3 power. I used two of these in the 36" Shelley Foss, and also in the 33" Wyeforce. Originally, the 35" Orca was set up this way too, and see no reason why it wouldn't work fine in the JC as well.
PAT
P. Tritle is offline Find More Posts by P. Tritle
Reply With Quote
Old Mar 10, 2005, 06:07 PM
Mostly harmless
Capt_Christo's Avatar
Sydney, Australia
Joined Feb 2005
382 Posts
Thanks Pat,

sounds like the way to go. I will use 2 in my tug if they are available out here.

BTW you guys are lucky to have club members close. There are no scale types in Sydney that I can find, most of the model boat people just do the highspeed elec and IC stuff. Several clubs in Victoria with nice places to run their boats, but thats 1000Ks away from me. Bummer!
Capt_Christo is offline Find More Posts by Capt_Christo
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Dumas "Jersey City" P. Tritle Scale Boats 87 Feb 11, 2010 08:11 AM
Discussion Jersey City engine TugFan Scale Boats 4 Feb 27, 2008 04:02 PM
Question Which motor for Dumas Jersey City? MG1500 Scale Boats 4 Dec 13, 2006 08:03 PM
Discussion Dumas Jersey City... Jeff G Scale Boats 14 Apr 18, 2005 09:43 PM
jersey city tugboat vett Boats (FS/W) 0 Jul 08, 2003 06:29 AM