Distance between launch controller & pad vs motor size

Distance between launch controller & pad vs motor size

Post by Mike Bellin » Tue, 07 Apr 1998 04:00:00



(Yet ANOTHER Launch controller question...)

Is there anyone who knows of a list designating the distance between the
launch controller and pad vs motor size?

I'm trying to figure out how much zip cord to buy. (Any cheap sources of
zip cord?)

Thanks.

Cheers,
Mike

 
 
 

Distance between launch controller & pad vs motor size

Post by Bob Kapl » Tue, 07 Apr 1998 04:00:00


Quote:

> (Yet ANOTHER Launch controller question...)

> Is there anyone who knows of a list designating the distance between the
> launch controller and pad vs motor size?

> I'm trying to figure out how much zip cord to buy. (Any cheap sources of
> zip cord?)

For model rockets, it's 15' for up to 30 NS and 30' for 30 ns and above (I
think there is a typo on the NAR web page here). For HPR it goes from 100'
up to 1500'.

Cheaper than zip cord is outdoor orange extension cord. Either cut the
connectors off, or build your system to connect to standard AC connectors.
The advantages of the latter are double: you can scrounge household cords
instead of buying them just for rockets, and if you want a longer one, you
can just plug two or more together.

        Bob Kaplow      NAR # 18L       TRA # "Abort, Retry, Fail?"

Kaplow Klips:   http://members.aol.com/myhprcato/KaplowKlips.html
NIRA:           http://ourworld.compuserve.com/homepages/Mark_Bundick/LAUNCH.HTM

 
 
 

Distance between launch controller & pad vs motor size

Post by The Silent Observe » Tue, 07 Apr 1998 04:00:00


Quote:

> (Yet ANOTHER Launch controller question...)

> Is there anyone who knows of a list designating the distance between the
> launch controller and pad vs motor size?

> I'm trying to figure out how much zip cord to buy. (Any cheap sources of
> zip cord?)

For the pad/controller distances, check the bottom of the page at:

http://www.nar.org/NARhpsc.html

For cheap sources of zip cord, there is no better or cheaper source
(which also happens to have other uses) than plain, ordinary heavy-duty
extension cords.  The three-conductor outdoor variety are commonly made
with 16 ga wire, are rated at 10A continuous (and will happily carry
pulses of 30A if the rest of your system will provide that much
current); have low-resistance, easily operated and familiar connectors,
and can commonly be had for around $10 to $20 for 100 feet, prebuilt.

It's very, very hard to beat that combination even if you value your own
labor at zero.

--
In their castle beyond night
Gather the Gods in Darkness;
And darkness weaves with many shades.  -- fragment attributed to Opyros

Donald Qualls, aka The Silent Observer           NAR # 70141-SR Insured
Rocket Pages             http://members.aol.com/silntobsvr/launches.htm

Opinions expressed are my own -- take them for what they're worth
and don't expect them to be perfect.

After 1 July 1998 Washington state law levies a $500 fine for sending
e-mail to this address which conceals its point of origin or has a
misleading subject line.  The sender must determine recipient location.

 
 
 

Distance between launch controller & pad vs motor size

Post by The Silent Observe » Wed, 08 Apr 1998 04:00:00


Quote:



> > Cheaper than zip cord is outdoor orange extension cord. Either cut the
> > connectors off, or build your system to connect to standard AC connectors.
> > The advantages of the latter are double: you can scrounge household cords
> > instead of buying them just for rockets, and if you want a longer one, you
> > can just plug two or more together.

> This is certainly the cheap solution, and it's what I've done. However,
> something has always bothered me about it. I would not want to see a
> youngster take one of my 6 foot "end" cords (the ones with the female end cut
> off and clips soldered on) and decide it was something interesting to plug
> into a live 120v outlet. My son knows better, but I'd hate to see anyone have
> an accident from this solution.

One solution available during the design stage is to cut off the >male<
end instead of the female, and make the rest of the wire run compatible
with this "reverse" plug scheme.  That way the clip pigtail can't
possibly be plugged into house current (and although the controller box
could be, the consequences there are small -- switches would normally be
stored open, right?).  You can do the same with the battery end also, if
you, like me, arranged a similar cord setup to connect to a car battery.

--
In their castle beyond night
Gather the Gods in Darkness;
And darkness weaves with many shades.  -- fragment attributed to Opyros

Donald Qualls, aka The Silent Observer           NAR # 70141-SR Insured
Rocket Pages             http://members.aol.com/silntobsvr/launches.htm

Opinions expressed are my own -- take them for what they're worth
and don't expect them to be perfect.

After 1 July 1998 Washington state law levies a $500 fine for sending
e-mail to this address which conceals its point of origin or has a
misleading subject line.  The sender must determine recipient location.

 
 
 

Distance between launch controller & pad vs motor size

Post by Bob Kapl » Wed, 08 Apr 1998 04:00:00



Quote:
> One solution available during the design stage is to cut off the >male<
> end instead of the female, and make the rest of the wire run compatible
> with this "reverse" plug scheme.  That way the clip pigtail can't
> possibly be plugged into house current (and although the controller box
> could be, the consequences there are small -- switches would normally be
> stored open, right?).  You can do the same with the battery end also, if
> you, like me, arranged a similar cord setup to connect to a car battery.

I've scored a couple dozen of computer type power cords. The end plugs into
a special recessed male or female jack (depending on the type), so there is
no chance of accidentially plugging anything into anything else. IIRC, we
used this kind of connector on the NAR system.

        Bob Kaplow      NAR # 18L       TRA # "Abort, Retry, Fail?"

Kaplow Klips:   http://members.aol.com/myhprcato/KaplowKlips.html
NIRA:           http://ourworld.compuserve.com/homepages/Mark_Bundick/LAUNCH.HTM