Yank Iris 4inch L1 cert questions

[LSA Solutions]

Im using a Yank Iris 4' by Loc Precision for my L1 certification. Im wanting to do my Level 2 with it. Im making a ebay with single deployment in mind. Im curious if anyone has done something similar with the Iris 4 inch. Im trying to figure where I should place the chute on the shock cord from the ebay to the motor tube? Any advice on this setup would be apprecitated.

 

[Upsrocketman]

My 4" Iris was used for my L2 and flew with the electronics bay minus the altimeters. Sometimes I'll put the parachute right on the eyebolt, sometimes it get attached about a foot away from the eyebolt. Either way it will open about the same time. Make sure you have a nomex blanket or lots of "dog barf" to keep the chute from getting charred.

What motor are you thinking for your L1?

 

[waltr]

Not the IRIS but the LOC 4" Goblin. Flew stock with motor eject for L1.
Then added an ebay and an extended tube for main chute for L2.
The ebay and extension doubled the weight from 3.2 to 6.5 pounds. Perfect weight for a small J (J270) and only go 3300 feet.

What do your sims show on your IRIS and the Ebay with a small J motor?

 

[FlyBy01]

Do you have any electronics experience yet?

 

[troj]

Im trying to figure where I should place the chute on the shock cord from the ebay to the motor tube? Any advice on this setup would be apprecitated.

If I'm measuring, I'll split things roughly into thirds and attach the parachute about 1/3 of the way from one end. The idea being that it keeps the two components from banging into each other during descent. I then attach the heat shield at least a foot or so away from where the parachute is attached.

It's also a lot easier to fold/prep a parachute when it's attached away from an eyebolt than if it's right up against it. You're also not trying to control a parachute to insert it into the tube at the same time you're having to hold both tubes.

-Kevin

 

[LSA Solutions]

My 4" Iris was used for my L2 and flew with the electronics bay minus the altimeters. Sometimes I'll put the parachute right on the eyebolt, sometimes it get attached about a foot away from the eyebolt. Either way it will open about the same time. Make sure you have a nomex blanket or lots of "dog barf" to keep the chute from getting charred.

What motor are you thinking for your L1?

Im thinking a j motor for my Level 1. Not to set on anything yet.

Do you have any electronics experience yet?

Yes I do

If I'm measuring, I'll split things roughly into thirds and attach the parachute about 1/3 of the way from one end. The idea being that it keeps the two components from banging into each other during descent. I then attach the heat shield at least a foot or so away from where the parachute is attached.

It's also a lot easier to fold/prep a parachute when it's attached away from an eyebolt than if it's right up against it. You're also not trying to control a parachute to insert it into the tube at the same time you're having to hold both tubes.

-Kevin

Thats a good point never thought of it like that.

 

[Titan II]

Im thinking a j motor for my Level 1.

?

 

[FlyBy01]

Im thinking a j motor for my Level 1. Not to set on anything yet.

Yes I do

Thats a good point never thought of it like that.

I would recommend reading the certification process for whichever organization you are certifying with either Tripoli or NAR. I would also highly recommend reviewing motor category to certification level.

 

[loopy]

Sim out what the altitude would be on a J for the L2 cert after you fly an H or I for your L1, but I think you'll be fine.

I'd suggest using plastic rivets to hold the payload tube to the upper portion of the av bay and shear pins to hold the nose, and just fly motor deploy for the L1, putting the main on the lower section about a foot from the attachment to the altimeter bay. After that, fly a few DD flights on L1 motors to get used to the process, the take your written test for L2 and load up the J.

 

[Handeman]

Do you intend for this rocket to be your one and only HPR for a while? If not, why not build another rocket for your L2? Something with a 54mm MMT so you can fly full J, K and baby L motors too.
There are a lot of valid reasons for using the same rocket for both certs, but most of the reasons I've heard of involve cost. I understand about cost limits, and if you are only going to fly your L2 so you can volunteer for RSO/LCO at your local field, that's great!
The flip side is if you intend to fly the full range of L2 motors, I would highly recommend building a true L2 rocket capable of at least J and K motors and use that for your cert. That way you'll have at least one rocket to put a variety of L2 motors in before you start building bigger and bigger rockets.

Take all this with a grain of salt. You have to consider your home flying field, waiver, budget, etc. No decision is wrong, it's your hobby and do it the way you want.