>"Since that huge clump of resistors won't fit into the AP
>housing................etc etc"
Equal value resistors add power when connected both in parallel or in series,
so Jim
gave you a 6 ohm resistor rated at 80Watts.
A couple of 3ohm, 10W resistors in series makes a 6ohm, 20Watt resistor.
Two resistors and a piece of wire may not be such a huge project afterall ?
Cheers
Ahmet
SV8827
> From: [email protected]
> Date: Thu, 4 Jun 2009 15:14:12 -0500
> To: [email protected]
> Subject: Re: [Liveaboard] autopilots (was) Re: Underway is the ONLY way!
>
> On Thu, Jun 04, 2009 at 01:27:42PM -0400, Jim Lynch wrote:
> >
> > So to get a 6 ohm resistor at 18 watts you'd take 4 of these in series
> > in parallel with 4 more in series. That would give you 6 ohms at 20
> > watts. 3 x 4 = 12 in each leg and two of those in parallel would be 6
> > ohms. Resistors in parallel add power so you'd have 10 watts x 2, or 20
> > watts.
> >
> > Seems cheap enough to me.
>
> It really isn't about the price, Jim; it's about the amount of
> involvement necessary. I.e., I'd have to sit here in Charleston and wait
> for the resistors to come in; then, I'd have to put it all together.
> Since that huge clump of resistors won't fit into the AP housing, I'd
> now have to cut the wire to the drive unit, insert the resistors -
> whoops, all that is going to be sitting out in salt air; better build a
> case for it. While I'm at it, those resistors shouldn't just sit there
> in the case - they'll couple all that heat into the closed space and
> cook themselves, so I guess I'd better rig a heat sink inside the case
> to mount them on. Oh yeah... I'll need some kind of external connectors
> on the box, too - maybe a terminal strip. I'll also need to find a good
> place for mounting this thing - where the heck can I do that along the
> route of the wire? - and make sure it doesn't get in the way of anything
> else, or jab anyone in the back when they sit down. Oh, and I should
> probably make the case waterproof - don't want those solder joints to
> oxidize! - and where the heck can I buy a suitable case, heat sink, heat
> transfer compound, terminal strip, and suitable screws? Maybe Radio
> Shack... yeah, I'll get a taxi... maybe stop by Home Depot if RS doesn't
> have everything I need...
>
> I have little doubt that Pending would be born right here in Charleston
> if I started down that path. Not what we're aiming for. :)
>
>
> --
> * Ben Okopnik * Editor-in-Chief, Linux Gazette * http://LinuxGazette.NET *
> _______________________________________________
> Liveaboard mailing list
> [email protected]
> To adjust your membership settings over the web
> http://www.liveaboardnow.org/mailman/listinfo/liveaboard
> To subscribe send an email to [email protected]
>
> To unsubscribe send an email to [email protected]
> The archives are at http://www.liveaboardnow.org/pipermail/liveaboard/
>
> To search the archives
> http://www.mail-archive.com/[email protected]
>
> The Mailman Users Guide can be found here
> http://www.gnu.org/software/mailman/mailman-member/index.html
_________________________________________________________________
Windows Live™ SkyDrive™: Get 25 GB of free online storage.
http://windowslive.com/online/skydrive?ocid=TXT_TAGLM_WL_SD_25GB_062009
_______________________________________________
Liveaboard mailing list
[email protected]
To adjust your membership settings over the web
http://www.liveaboardnow.org/mailman/listinfo/liveaboard
To subscribe send an email to [email protected]
To unsubscribe send an email to [email protected]
The archives are at http://www.liveaboardnow.org/pipermail/liveaboard/
To search the archives http://www.mail-archive.com/[email protected]
The Mailman Users Guide can be found here
http://www.gnu.org/software/mailman/mailman-member/index.html
