Little help please

[north boy]

Hi everyone, I'm in the middle of a wee build just now and trying to push my skills in the rocket building stuff. I've broken into fibre glassing and tip to tip etc. I'm building a rocket that I'll reveal in a thread once I've finished it so it doesn't drag on for 2 or 3 months while I build it. I'm going to spend as much time on the paint and I am on the build process so I am hoping for a pride and joy rocket at the end. I'm thinking maybe a yellow and black zebra stripe finish or something but thats still in the mix.

A few specs on it are:

70mm fibre glass tube
3 fin set up (fibre glass) 1/8" thick
fins are through the wall and filleted then I'm going to tip to tip them for strength
There not right through to the MMT
Rocket will be about 4 foot long approx!

The out come I want to achieve is a slow and not to high finish on the model with apogee main or DD but that's why I'm posting. I'm at the stage I need to start making some serious decisions about recovery and motor choice. I've decided on a 29mm relodable and not a 38mm due to cost's but mainly down to the fact I want to keep the flight speed down and not hit an out of sight flight. It's a big gird so couple of thousand feet will keep me happy. All in before any electrics (which I might not need ) is 1.5 KGs nearly 3.5 lbs. With the weight should I have electrics as a back up for safety and do a deploy at 1000 ft of a DD circuit any way ?? 3.5 lbs coming in as a dart isn't good if the motor charge fails in my eyes plus the loss of 4 months from scratch loss would sicken me a bit

Sorry for all the questions but I'm needing a bit of guidance in the right direction

[Zeus-cat]

Personally, I think it is a good idea to use an altimeter for rockets this big. I set it up so that the altimeter is the primary ejector of the droque at apogee. The motor is my backup and it will have a delay that fires after apogee. I use the altimeter to deploy the main at whatever altitude makes sense for the launch area and the rocket. Lots of space, deploy higher. Not so much space ofr landing, deploy lower. Do you have a source for gunpowder or Pyrodex for ejection charges where you live?

[north boy]

I have pyrodex at hand and I can easy make a secondary deployment from that. I'm going to buy a RRC2 altimeter for the rocket but I'm still needing to decide the motor load required for. Im thinking a 29mm 4 grain would do the job