my first dual deployment

[dyckster]

i am sending up my rrc 2 mini this weekend if weather permits. This will be my first ever dual deployment attempt. Is this thing default set set to deploy or do I have to set it. I am relatively new, so please keep the dialog in laymans terms.lol thanks

[scsager]

I don't have any answers for you - but I did take a look at the user guide.

Now I understand you question much better !

It really does have a plethora of settings.

[Salvage-1]

Basic User Mode
The RRC2-mini provides many new and advanced features over the older model RRC2 Classic and RRC2X altimeter products.
These advanced features are truly optional and are not necessary to use the unit for traditional dual deployment purposes.
In Basic Operation Mode, the user selects the main deployment elevation of 500’ or 1000’ by the position of the Profile Select
switch at power-up time. Profile 1 defaults to standard dual deployment operation with a 500’ AGL main event, and Profile 2
defaults to standard dual deployment operation with a 1000’ AGL main event.

I dont have one myself, but, if I am reading right, then the tech is set up to fire at apogee and either 500 or 1000 ft depending where the switch is. These appear to be the 'out of the box' settings.

[blackjack2564]

There is a video under RRC2 mini downloads that show you how to program the unit. Very helpful to get you past the confusion.
http://www.missileworks.com/index.ph...page=page&id=1

As stated it is ready to use out of the box EXCEPT: The mach delay is set at zero [0 default],if you plan on any flights that MAY exceed mach.8 it is advisable to set the mach delay to 4 seconds. [for most flights] Meaning if you put larger motors in your rocket , this comes into play. Since you have not given us the full information on your flight,[ type kit or size,weight diameter, motor flown ] I cannot tell you if you are at risk or not.

What happens is: when rocket begins to enter mach a shock wave develops that can give false readings to the altimeter. Motor burnout is usually where max speed happens. If this coincides with mach or approaching mach, the shockwave can trigger false readings & the altimeter can fire your apogee charge while the rocket is traveling at it's highest speed resulting in very bad things, zipper the airframe, strip the chute etc.

The mach delay postpones any readings for the time set, thus preventing charges from firing. After the 4 seconds[in this case] the unit continues functioning as designed. Hence the term "mach delay" delaying readings until rocket has passed through the mach phase.

The larger the motor and faster the anticipated flight, the longer the mach delay is set. For most beginners flying altimeters I find 4 seconds just about right. This phenomenon requires a lengthily explanation to cover all aspects, I'm just giving you the simple version.

Some altimeters you must set the delay, some are mach immune by design, some use barometric readings to function [like this one] others use accelerometers instead,[they are also mach immune]. There is no right or wrong way, just different approaches to design.

[dyckster]

hey thanks for the information, ive read the user guide several times but its always nice to get tips from someone who has been there and done it.
The weather is shaping up great for the weekend, I can't wait to send my stuff up.
I'll post a pic after the weekend

[sylvie369]

If you haven't done so already, I'd hook up a couple of good ematches to it (with NO bp charge), and power it up so you're familiar _now_ with what it's supposed to sound like when everything is set right. You're going to want to listen to the beeps on the pad and know what it's telling you.