L1 Certification OpenRocket Help

[AymanM]

Hi everyone,

I'm looking to get my L1 certification, so I've created a barebones open rocket design based on tutorials I found online. I'm using an H182 motor in a 60 mm body tube. I know I'm missing some things but I'm not sure what they are. Any help or thoughts about this would be much appreciated.

 

[kjhambrick]

@AymanM --

Your design looks fine to me.

It is stable with the H182R and it flys high enough to be fun but not too scary

One Q ...

Do you plan to roll your own 60 mm tube and lay up a 60mm x 200mm nose cone ?

If not, you might want to check say, the eRockets > Body Tube Sizes chart to find some off-the-shelf tubing and a nose cone to match ?

The rocket looks stable:


One comment however:

You'll want to enter your final masses and re-sim to decide on how much to adjust your ejection charge delay.

The motor comes with a 14-sec delay and given your current weights and measures, you'll want about 11 sec:


EDIT: but the weights and the CG ALMOST ALWAYS change after the rocket is built !

It is also interesting when you fly off a 250cm rail with an 11.2 mph / 5 m/sec wind in sim #1 that the altitude at apogee is 3289 ft -vs- 3310 ft for a 100cm rail with a 4.47 mph / 2 m/sec wind in sim #2 ...

It looks good to me !

Build it, weigh it, re-sim it, take your test and send it !

HTH and good luck !

-- kjh

 

[bad_idea]

I'd bump the fin span a little, and I'd move the recovery gear back in the rocket where it will shift under acceleration. Then update all the masses in OpenRocket as you build it.

 

[bjphoenix]

I don't know what parts you have readily available or what size launch area you have. An H motor in a 60mm diameter rocket will achieve a pretty high altitude and will require a large recovery area. It would be a little bit easier if you could build a rocket closer to 100mm diameter.

 

[loopy]

Motor retention?

 

[boatgeek]

~1000m altitude on a ~60mm diameter rocket will be out of sight unless you have exceptionally good eyesight and/or exceptionally clear weather. You might want to bump up to 75mm tube to fly a little lower and have a slightly larger object to track.

 

[Ronz Rocketz]

2.3in rocket will disappear unless you have GPS tracking. Otherwise might drift for a mile and you’ll spend a week looking for it. Consider JLCR to keep it within a quarter mile. Then you’ll only have to spend an hour looking for it. Here’s my sons 3in rocket.