High power cluster restrictions

[mcriminale]

Am i allowed to turn around after getting a level 1 certification to launch a cluster of I motors that have more total impulse a a J or above or not because i can’t find a definite answer online.

-Thank you, Matthew

 

[LithosphereRocketry]

Am i allowed to turn around after getting a level 1 certification to launch a cluster of I motors that have more total impulse a a J or above or not because i can’t find a definite answer online.

-Thank you, Matthew

As I understand, you're limited to I-class total impulse, so your configuration would be a no.

 

[techrat]

As I understand, you're limited to I-class total impulse, so your configuration would be a no.

That's correct, just as Low/Mid power rocketeers cannot cluster 30 estes C6 motors together and make something akin to a M motor.

 

[mcriminale]

That's correct, just as Low/Mid power rocketeers cannot cluster 30 estes C6 motors together and make something akin to a M motor.

Ok thank you for feedback

 

[SDramstad]

That's correct, just as Low/Mid power rocketeers cannot cluster 30 estes C6 motors together and make something akin to a M motor.

Thats actually a 50%H motor and its been done.





Thats Flash Daddy on 30 C-6-5s

 

[mcriminale]

Thats actually a 50%H motor and its been done.

View attachment 539375

View attachment 539376

Thats Flash Daddy on 30 C-6-5s

Cool seems like a nightmare to get every igniter to light i think someone did a 50 estes E cluster and got it off the ground

 

[green dragon]

Used to be you could fly up to double your cert level with clusters.
ie: an L1 could cluster up to 1280 nsec, L2 up to M total impule... has this changed ?

 

[SDramstad]

Cool seems like a nightmare to get every igniter to light i think someone did a 50 estes E cluster and got it off the ground

1 igniter and a flash pan. Lit 27 out of 30

 

[RocketflierVB]

269 "D's" M-3330 (so I've been told)

 

[RocketflierVB]

Ro maybe this one... 316 "D's"

 

[techrat]

hOLY cOW! But that assumes that all of those actually fired. Also, those rockets look very LDRS, so I'm going to assume the owner was a L3 holder, and could already fly that level of impulse.

 

[Steve Shannon]

Used to be you could fly up to double your cert level with clusters.
ie: an L1 could cluster up to 1280 nsec, L2 up to M total impule... has this changed ?

I don’t recall that, but something similar exists in the requirement to be certified. From the NAR site:

High Power Certification is required if a person wishes to:

Launch rockets containing multiple motors with a total installed impulse of 320.01 Newton-seconds or more, or
Launch rockets containing a single motor with a total installed impulse of 160.01 Newton-seconds or more, or
Launch rockets that weigh more than 53 ounces (1500 grams), or
Launch rockets powered by motors not classified as model rocket motors per NFPA 1122, e.g.:
Average thrust in excess of 80.0 Newtons
Contains in excess of 125 grams of propellant
Hybrid rocket motors

 

[waltr]

I don't recall allowing double to total impulse of your Cert level when clustering. I have been studying for L2 test.
As a Class 1 rocket one may go to 320Ns (H motor equivalent) with a cluster but still have the 80N Average thrust limit as per the rules Steve posted above.

 

[UhClem]

It used to be spelled out on the NAR web site. But all I can find now is on the certification form: "We believe this member is qualified to build and operate High Power Rockets with a total installed impulse up to 640 N-sec."

The NAR page used to say: "Certification at this level permits single or multiple motor rocket flights with motors having a maximum total impulse of 640.00 Newton seconds."

 

[mcriminale]

4: The Level 1 High Power Certification Candidate must demonstrate their ability to build and fly a rocket containing at least one H or I impulse class motor. Cluster or staged models used for certification may not contain over 640.00 Newton seconds total impulse. In the case of a cluster or staged model, at least one of the individual motors must be an H or I impulse motor. Combinations of smaller impulse motors that add up to meet the impulse requirements do not qualify as the model does not contain at least one H or I impulse motor. Single use, reloadable, or hybrid technology motors are permitted. The Level 1 High Power Certification Candidate must assemble the reloadable motor, if used, in the presence of a Certification Team member.**
https://www.nar.org/high-power-rocketry-info/level-1-hpr-certification-procedures/

 

[mcriminale]

Am i allowed to turn around after getting a level 1 certification to launch a cluster of I motors that have more total impulse a a J or above or not because i can’t find a definite answer online.

-Thank you, Matthew

High Power Level 1 Participation certification is required to:

1. Launch rockets containing multiple motors with a total installed impulse of 320.01 Newton-seconds to 640 Newton-seconds

Got it