SMALL - espritmodel.com SMALL - Telemetry SMALL - Radio
Reply
Thread Tools
Old Aug 20, 2014, 01:18 PM
Registered User
Joined May 2006
32 Posts
Discussion
Cyclone class 1/96 scale

Hello Micro Team, I need your help.

I have been working on a 1/96 scale cyclone class patrol boat which is about 18 inches long for a while now. I have been trying to RC the boat but I keep failing. I really could use some ideas in how to power it.

- First off, she has 4 props, so that would mean I need 4 motors (or a gearing system). The motors I started with from Radio shack were ok at first, but they are literally burning out on me. It might be the battery which is a 1000map 7.4 volt Lipo. It puts out some good speed on the motors, but kills them.

- I have a mico servo for the props so thats set.

- The weight is a little heavy but not by much.

- The props I am using are 1/350 scale brass DDG Burke which look great.

I can show photos if you like, but it would be just the ship itself. The inners are a mess.

OK. Ideas? Anything would be great, but I am not going to get a Chinese toy that has no power and very short range and run time. Anything else is on the table.
HomePort Models is offline Find More Posts by HomePort Models
Last edited by HomePort Models; Aug 20, 2014 at 01:19 PM. Reason: Adding notification
Reply With Quote
Sign up now
to remove ads between posts
Old Aug 20, 2014, 01:37 PM
Registered User
Joined May 2006
32 Posts
HomePort Models is offline Find More Posts by HomePort Models
Reply With Quote
Old Aug 27, 2014, 12:56 PM
Big Boats Rule!
boater_dave's Avatar
Wisconsin
Joined Jun 2007
2,007 Posts
Don't use cheap Radio Shack motors. They often don't have carbon brushes, and are very low voltage motors.
In scale projects, it's easiest to work backwards from the prop, as that is dictated by the real ship and scale. How big are your props, and do you have an idea of what speed you need to spin them at? I'm guessing about 3/4" and 5000 rpm. Have you looked for 1:18 scale or 1:24 scale rc car motors? Even the motors for the small sized foam airplanes, as they are designed for 2S lipo power. Check out some E-Flight motors. I've had some luck with these...
http://www.goldmine-elec-products.co...p?number=G9330
These are interesting...
http://www.goldmine-elec-products.co...?number=G19739
The very common 280 motor...
http://www.mpja.com/12VDC-11000-RPM-Motor/productinfo/18298%
20MD/


Dave
boater_dave is online now Find More Posts by boater_dave
Reply With Quote
Old Aug 28, 2014, 04:23 AM
Registered User
Blackpool, Lancs
Joined Feb 2006
2,967 Posts
For a source of motors of the right power and able to handle the volts offered, I would use servo motors from standard servos. If they can't be fitted side by side , you can always stagger them. Just one moves a Lindberg trawler along nicely - four should make this similar size boat go very well.
If the Radio Shack motors are the same as the ones I got from them when I first started many years ago, they are fine if you dont need a lot of power and can stick to 3 volts. I never used them in a boat with a radio, so I dont know if they need a lot of suppressing, but suspect that they will, especially if run on a higher voltage than they were designed for.
mfr02 is offline Find More Posts by mfr02
Reply With Quote
Old Sep 02, 2014, 09:33 PM
Registered User
Joined May 2006
32 Posts
Wow. Thanks for this information. I am happy to get some new engines for the ship, but weight is an issue, so I can't go too large. And the E-Flight helicopters and planes don't have the torque to turn the props, which are smaller than a Dime. Maybe 3/16 inch diameter. They are 1/350 scale DDG Burke Brass props, which look like the real thing on the ship.

Also, how are you connecting from the servo to the shaft? The servo has a gear on it, which I can not remove.

I think I will research the ones you suggested here. Thanks again.
Eric
HomePort Models is offline Find More Posts by HomePort Models
Reply With Quote
Old Sep 08, 2014, 03:54 AM
Registered User
Blackpool, Lancs
Joined Feb 2006
2,967 Posts
Quote:
The servo has a gear on it, which I can not remove
Yes you can. Putting it back on afterwards is the difficult bit since the cog usually gets destroyed. I just put my cog into the jaws of a bench vice and squeeze. Since the cog is the weak link between the shaft and jaws, it gives up first.
At this size and power, for couplers I go the my local low cost hardware store where they cost me 1 for 5. The shopkeeper thinks he is selling flint type disposable lighters. I am buying flint springs and wondering what to do with the rest of the bits. The spring ends are tapered and fit a variety of shafts with varying degrees of pushing. The noses of the prop shaft and motor shaft do need to be almost touching. This ensures good alignment and prevents having an unsupported length of spring which could start whipping.
A friend suggested leaving the cog in place and using it as part of a CV joint, the other half being a close fitting metal tube to locate the join, and filling it with low melt plastic to mould itself over the cog teeth to provide drive. I'm waiting for him to try on one of his - I still have some lighters left over.
mfr02 is offline Find More Posts by mfr02
Reply With Quote
Old Sep 14, 2014, 10:22 PM
Registered User
Guard-Officer's Avatar
Canada, ON, Quinte West
Joined Feb 2009
934 Posts
Thats a pretty cool little patrol ship. I normally work in 1:100, so very close to your scale. I used a pair of 14 scale servos and used the circuit board as well as an esc for each shaft. the prop shaft is coupled to the motors using a small length of silicone tubing. it is flexible and very grippy. Have a look at the build log below for an idea of the layout and functionality. It only draws 5/8th of an inch of water, which means I had almost nothing for displacement to work with! and yet i did not have to change the hull shape at all in order to animate the radars, crane, working lights, steering servo and dual engines.
You'll easily meet your needs using the standard servo's and a LiPo. If you can, make sure teh servo's will accept the higher voltage.
http://www.rcgroups.com/forums/showthread.php?t=1119306
Cheers
G-O
Guard-Officer is offline Find More Posts by Guard-Officer
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion 1/96 Scale Ticonderoga Class Large Mast HomePort Models Scale Boats 12 May 19, 2014 10:00 PM
Sold 1/96 scale USCG Hamilton Class Cutter RCBoater Boats (FS/W) 0 Apr 24, 2014 06:21 PM
Build Log 1/96 Casablanca Class Escort Carrier Jcopter Scale Boats 100 Apr 06, 2014 04:34 PM
Discussion Catsle class 1/96 scale from dean marine rondean1 Scale Boats 0 Feb 08, 2014 05:22 AM
1:96 scale GATO class CG Bob Submarines 10 Jan 09, 2009 09:14 PM