1/96 Ohio SSBN/SSGN build underway

[pirate]

Now taking orders:

http://www.postimage.org/Pq5Zni0.jpg

Now taking orders:

[emspaul]

Hi Peter ,
I have been

Hi Peter ,
I have been reading your build.
I must say I am quite impressed .
Here is link for you for l.e.d.s that I use for mast lights.
http://www.nteinc.com/specs/30000to3009 ... 0002_4.pdf.
Theses work great .
Paul

http://www.homeportmodels.com/

[pirate]

Thanks Paul. I remember getting

Thanks Paul. I remember getting your emails about your boats. Very nice.

The link here is no good though.

Pete

[emspaul]

Pete,
Try this one http://www.nteinc.com/
Type in

Pete,
Try this one http://www.nteinc.com/
Type in 30002 in the search area.
I think you are talking about Eric ,quite the modeler .
Some day I hope to be that good.
Paul

http://www.homeportmodels.com/

[pirate]

Re: 1/96 Ohio SSBN/SSGN build underway

Finally got the masts complete...AND THEY ACTUALLY WORK.

Put together this lame video in iMovie. Enjoy.

http://www.youtube.com/watch?v=eEEKZsxSx4s

[bigdave]

Re: 1/96 Ohio SSBN/SSGN build underway

Looks Great!
Excellent work Pete!! BD.

[Guest]

Re: 1/96 Ohio SSBN/SSGN build underway

Are you using a servo for the scopes?

[PaulC]

Re: 1/96 Ohio SSBN/SSGN build underway

Yes, what system are you using, Pete? We'd love to see it.

[pirate]

Re: 1/96 Ohio SSBN/SSGN build underway

Thanks. In the video they are finger driven, but they will be servo driven.

[Guest]

Re: 1/96 Ohio SSBN/SSGN build underway

I'd recommend the use of a digital servo if you are going to slow it down (to get realistic looking actuation). I find digital servos are much smoother when speed controlled than their analogue counterparts, and if you know where to look for cheap servos, the price differential is not so great now.

[PaulC]

Re: 1/96 Ohio SSBN/SSGN build underway

Andy,

How do you speed control a servo?

[bigdave]

Re: 1/96 Ohio SSBN/SSGN build underway

Pete,
You can buy servo speed reduction units. I think EMS sells one. My Multiplex EVO radio has one built in as a feature but I think it is the only radio that does.
BD.

[Guest]

Re: 1/96 Ohio SSBN/SSGN build underway

It's possible to make a hardware circuit, but the simplest way these days is to use a microcontroller. There are ready made speed controllers available, quite inexpensively like this one-

http://hobbyking.com/hobbycity/store/uh ... oduct=8863

I'm not sure how much you know about how R/C systems work, so I'll start from the basics.

Servos are controlled using pulsed signal. This signal under normal operation works from 1-2 ms (milliseconds) with 1.5ms being centre, and the servo should swing 45 degrees each way within the 1-2ms range. It's possible to extend servo travel beyond this by increasing the range of the pulse. Most servos are mechanically limited to 180 degrees by a stop moulded in the output gear, this can be dremeled off, and the servo should then be able to move about 270 degrees- the feedback potentiometer would now be the limitation.

Under normal circumstances, you move the stick, the pulse width changes immediately, and the servo moves as fast as it can to get to the position proportional to the pulsed signal. A servo slow will have a little microcontroller (PIC Atmel etc) which will hijack the signal from the receiver, and will chop up the pulse width in little segments and put delays in between the segments.

So for instance. say you move the stick from centre (1.5mS) to one extreme of control (1.0ms). Normally the pulse would instantly change. However with a servo slow, it will go 1.5ms, delay, 1.45ms delay, 1.4ms, delay. The narrower the pulse width changes the finer the resolution. Also the longer the delays, the slow the servo moves.

If you're savvy with programming (you can use assembler, BASIC and C), then you can program this sort of thing yourself, and it's a cinch to control half a dozen servos using a single microcontroller which will only cost a couple of pounds.

[bill harris]

Re: 1/96 Ohio SSBN/SSGN build underway

That device is called a "Go-Slo" and is/was available from McDaniel R/C Electronics, now a part of SonicTronics:

http://www.sonictronics.com/xcart/home.php

On aircraft it is used to slow down the action of flaps and landing gear, which doesn't need to be as fast as the servo is designed to travel.

--Bill

[Guest]

Re: 1/96 Ohio SSBN/SSGN build underway

$42!