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First MMX Post!
#11
Couple of questions:

What diameter is the MMX launch rod?

Can the MMX igniters be safely used with an Estes launch controller? Do they tend to ignite on a continuity check like Q2G2s?

I've thought of getting a Quest launch set but if I can get going with a hardware store rod and an Estes controller, so much the better.
Rich Holmes
Camillus, NY
Secretary / newsletter editor
Syracuse Rocket Club

http://richsrockets.wordpress.com
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#12
(06-10-2015, 12:56 PM)Rich Holmes Wrote: Couple of questions:
What diameter is the MMX launch rod?
Can the MMX igniters be safely used with an Estes launch controller? Do they tend to ignite on a continuity check like Q2G2s?
I've thought of getting a Quest launch set but if I can get going with a hardware store rod and an Estes controller, so much the better.

Hi Rich,
Doing a search I get two different diameters:
".047″ diameter music wire"
"A 12" long x 0.049" diameter music wire launch rod is standard."

The wire I bought and use now fits the FlisKits MMX launch lugs very well.
The lug fit on the Quest RFT plastic models was too tight. I opened up the molded lugs with a small file to fit it.

The Quest MMX Igniters are bare wire. They won't ignite on a continuity check light with either an Estes or Quest controller.
Used on an Estes style launcher they are held in the nozzle with a toothpick. 
With the igniter in the small nozzle, it's easy to have the igniter wires touch.
You do have to push the tip in far enough to contact the black powder.
Don't cram the toothpick in, I've read where MMX have expoded. Never had that happen to me though.

Using the Estes style launcher, make your own MMX rod adapter.
http://modelrocketbuilding.blogspot.com/...f-tip.html

These are bare wire igniters and you will have to hold the launch button down for a second or two
longer if using the 6 volt Estes controller.
On a positive note, I have re-used a single MMX igniter a dozen times!
They usually don't burn through using just 6 volts.


Attached Files Thumbnail(s)
       
Hans "Chris" Michielssen
Old/New NAR # 19086 SR
www.modelrocketbuilding.blogspot.com

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#13
Thanks! That adapter's a great idea.
Rich Holmes
Camillus, NY
Secretary / newsletter editor
Syracuse Rocket Club

http://richsrockets.wordpress.com
Reply
#14
I launched those three MMX models this morning.
All three are near minimum diameter and get great altitudes.
If the engines had a longer delay they would go higher.
These are fast off the launcher, real neck snappers.

All looked like they reached nearly 80 to 100 feet. Who knows for sure, I'm standing directly under them.
No picture of the BIC pen model. On the BIC rocket, the entire recovery system (including the Kevlar
tied to the engine block) was pulled out through the top at ejection!
The model fell slowly in two sections.

The picture shows the MMX rod adapter.
On one side of the 18mm casing is a 1/8" launch lug, that slides down your regular launch rod.
On the other side is the MMX rod, simply taped to the casing.


Attached Files Thumbnail(s)
   
Hans "Chris" Michielssen
Old/New NAR # 19086 SR
www.modelrocketbuilding.blogspot.com

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