How to build a good Home made launch controller?

How to build a good Home made launch controller?

Post by Steve Bloo » Tue, 12 May 1998 04:00:00



My temporary sometimes-it-works-sometimes-it-don't website has a picture of
the launch pad I built for about $25.  Regular old water pipe.  Heavy,
portable and sturdy.
http://www.geocities.com/CapeCanaveral/Launchpad/4186/sep1_97.htm

The rod is held down by a nut bonded to the rod under the cap.

Steve Bloom
Seattle area Rocketeer
I build em, I fly em

Quote:

>I am about ready to launch my Launch Pad Bullpup 12-B for the first time.
>Can anyone help me with a good home built system that is easily built?

>Thanks,
>Josh

 
 
 

How to build a good Home made launch controller?

Post by Josh Wenec » Wed, 13 May 1998 04:00:00


I am about ready to launch my Launch Pad Bullpup 12-B for the first time.
Can anyone help me with a good home built system that is easily built?

Thanks,
Josh

 
 
 

How to build a good Home made launch controller?

Post by Des Bromilo » Wed, 13 May 1998 04:00:00


Quote:

> I am about ready to launch my Launch Pad Bullpup 12-B for the first time.
> Can anyone help me with a good home built system that is easily built?

> Thanks,
> Josh

have you tried the Sunsite archives for rmr? i got one from there (I
think.. memory isn't what it should be) that was designed by bob kaplow
and is more than adequate for most things. I omitted the charging points
but you may need them, depending on your own personal preference.

I built mine with the 12V car battery inside a wooden box which formed
the base for the pad. I used old 35mm film cans to house the actuating
switch and i used another film can with a second switch as a removable
safety interlock key (replaces the normal arming key) which allows
children to help launch without jeopardising the safety.
Total cost excluding battery ~$30 AUS including some S/Steel launch
rods.
I got my battery from the local auto sparks for $2 since it was to
clapped out to crank a car he gave it to me for s***value.

Hope this helps
des bromilow
QRA Australia

 
 
 

How to build a good Home made launch controller?

Post by michael monc » Wed, 13 May 1998 04:00:00


Quote:

>I am about ready to launch my Launch Pad Bullpup 12-B for the first time.
>Can anyone help me with a good home built system that is easily built?

Whether it qualifies as "easily built" depends on your skills, but I
have a schematic and plans for the controller I use on my web site.
It's a 12V relay system with a number of extra features, although it
could be simplified.

http://www.xmission.com/~mgm/rockets/launcher.html

--

 
 
 

How to build a good Home made launch controller?

Post by Jeff Pleimlin » Wed, 13 May 1998 04:00:00




Quote:
> Whether it qualifies as "easily built" depends on your skills, but I
> have a schematic and plans for the controller I use on my web site.
> It's a 12V relay system with a number of extra features, although it
> could be simplified.

> http://www.xmission.com/~mgm/rockets/launcher.html

I *finally* have all the parts to build this launch system (took trips
to 3 different stores).  I'm not an electronics wiz, but can read a
schematic and this one seems really nice.

Using telephone wire/jacks for the connection was a plus for me
since I have a couple of 50' cables already laying around the house.
I was considering building a controller using an orange outdoor
extension cord, but this solution is *much* lighter to carry to
the field.

Thanks to Michael for the design!

jeff

 
 
 

How to build a good Home made launch controller?

Post by Todd Lainhar » Wed, 13 May 1998 04:00:00


I built a launch controller based on this design, and it works well.  The
one thing I got hung up on was finally realizing that 4conductor phone
extension cable flips the red/green and black/yellow connections from one
end to the other (well, they really don't flip, but that's the net effect
one you trace from one end to the other).  Once I got over that
forehead-slapper, it worked fine.  The only upgrades I made were to use
better (momentary) pushbuttons on the controller.  For the battery, I used a
Pratt Hobbies double power pack (and upgraded the fuse from 20A to 25A, as I
popped the 20A on one launch).

Thanks again to Michael for posting the design.

    -- Todd

Thanks to Michael for posting it.

Quote:



>> Whether it qualifies as "easily built" depends on your skills, but I
>> have a schematic and plans for the controller I use on my web site.
>> It's a 12V relay system with a number of extra features, although it
>> could be simplified.

>> http://www.xmission.com/~mgm/rockets/launcher.html

>I *finally* have all the parts to build this launch system (took trips
>to 3 different stores).  I'm not an electronics wiz, but can read a
>schematic and this one seems really nice.

>Using telephone wire/jacks for the connection was a plus for me
>since I have a couple of 50' cables already laying around the house.
>I was considering building a controller using an orange outdoor
>extension cord, but this solution is *much* lighter to carry to
>the field.

>Thanks to Michael for the design!

>jeff


 
 
 

How to build a good Home made launch controller?

Post by michael monc » Wed, 13 May 1998 04:00:00


Quote:

>I built a launch controller based on this design, and it works well.  The
>one thing I got hung up on was finally realizing that 4conductor phone
>extension cable flips the red/green and black/yellow connections from one
>end to the other (well, they really don't flip, but that's the net effect
>one you trace from one end to the other).  Once I got over that
>forehead-slapper, it worked fine.

That's something I just dealt with without thinking, since I do lots
of phone wiring. I'll add a tip to that effect to the plans, though.

Glad you enjoyed the design!
--

 
 
 

How to build a good Home made launch controller?

Post by Mike Cre » Thu, 14 May 1998 04:00:00



Quote:

> >I am about ready to launch my Launch Pad Bullpup 12-B for the first time.
> >Can anyone help me with a good home built system that is easily built?

> Whether it qualifies as "easily built" depends on your skills, but I
> have a schematic and plans for the controller I use on my web site.
> It's a 12V relay system with a number of extra features, although it
> could be simplified.

> http://www.xmission.com/~mgm/rockets/launcher.html

> --


Thanks for this.

Does anyone know of a site that has a conversion for Radio Shack part numbers
into component descriptions / specs. I've tried searching on various
combinations, but have had no luck :-(
On this side of the pond, Radio Shack is more into consumer electrics/
electronics than components, and the ones they do stock seem to be twice
the price as other places, and only available in packs of three times what
you require!

Cheers,


"I am not a number, I am a free man!"

 
 
 

How to build a good Home made launch controller?

Post by Bob » Fri, 15 May 1998 04:00:00


[snipped...]

Quote:
> Does anyone know of a site that has a conversion for Radio Shack part numbers
> into component descriptions / specs. I've tried searching on various
> combinations, but have had no luck :-(
> On this side of the pond, Radio Shack is more into consumer electrics/
> electronics than components, and the ones they do stock seem to be twice
> the price as other places, and only available in packs of three times what
> you require!

You could always try contacting Maplin and asking them if they could recommend
a similar product from the thousands that they stock. You can pick up a catalogue
in any WH Smiths (in England) or John Menzies (in Scotland). Alternatively you
can check out their web page : http://www.maplin.co.uk (It seems to be down
at the moment 10.19 am GMT, but I was working last night...).

Hope this helps,

Bob.

P.S. I was going to contact them as I think I'll have a stab at this controller...
------------------------------------------------------------------------------
"There are theories at the bottom of my jargon."

 
 
 

How to build a good Home made launch controller?

Post by Mike Cre » Fri, 15 May 1998 04:00:00



Quote:

> [snipped...]

> > Does anyone know of a site that has a conversion for Radio Shack part numbers
> > into component descriptions / specs.
<snip>
> You could always try contacting Maplin and asking them if they could recommend
> a similar product from the thousands that they stock.
<more snip>
> I was going to contact them as I think I'll have a stab at this controller...

I had a stab at matching up the descriptions in my copy of the catalogue, but
I'd prefer to get an exact (or as close as possible) match for the 'critical'
components.
If you have any joy getting the right parts, please let me know.
BTW my local Maplins (Bradford) has started stocking some Estes stuff.
They had a couple of starter sets (Skywinder, Mach 12); a rack of A's, B's, C's;
some wadding, and igniters. All overpriced! I think I'll only use them for
emergencys!!! ;-)

Keep 'em Up!


"I am not a number. I am a free man!"

 
 
 

How to build a good Home made launch controller?

Post by Craig Frase » Sun, 17 May 1998 04:00:00


Quote:


> >I built a launch controller based on this design, and it works well.  The
> >one thing I got hung up on was finally realizing that 4conductor phone
> >extension cable flips the red/green and black/yellow connections from one
> >end to the other (well, they really don't flip, but that's the net effect
> >one you trace from one end to the other).  Once I got over that
> >forehead-slapper, it worked fine.

> That's something I just dealt with without thinking, since I do lots
> of phone wiring. I'll add a tip to that effect to the plans, though.

> Glad you enjoyed the design!
> --


 You might also add a note about a related issue. When coupling two premade modular
cords, two "flipped" in series equals one "unflipped". I forgot this and coupled
two 50' cords together and for a while couldn't figure why it didn't work, as each
cord worked separately. Odd numbers of premade cords in series is OK, if your jacks
are wired to use standard premade cords. I bit the bullet and bought a cheap
crimping tool to make cords of the proper length.

--