Clustering requiring certification?

Jacktango22

Well-Known Member
TRF Supporter
Joined
Jun 30, 2022
Messages
51
Reaction score
21
Location
Usa
Just getting back into this as a retirement gift to myself. I think that I will stay in the mid power range and not seek L1 certification because i can pretty much do all I want to do in the E and F range. BUT what happens if I want to try clustering some F motors together that collectively have the power/impulse seen in L1 certification flights? Maybe there is an easy answer in the literature but I thought I’d try this first. Thanks. love this Forum.
 

samb

Lifetime Member
Joined
Jan 22, 2009
Messages
4,429
Reaction score
876
Location
Plano, TX
Welcome back to the party. From the NAR website:

  1. High Power Certification is required if a person wishes to:​

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

prfesser

Well-Known Member
TRF Supporter
Joined
May 7, 2017
Messages
2,983
Reaction score
3,941
Location
Murray, KY
Just getting back into this as a retirement gift to myself. I think that I will stay in the mid power range and not seek L1 certification because i can pretty much do all I want to do in the E and F range. BUT what happens if I want to try clustering some F motors together that collectively have the power/impulse seen in L1 certification flights? Maybe there is an easy answer in the literature but I thought I’d try this first. Thanks. love this Forum.
An F motor has a maximum impulse of 80 N-s, so one could cluster up to four of those motors without requiring certification. Four F motors would be a pretty hefty project.
 

PayLoad

I don't do spirals
TRF Supporter
Joined
Aug 20, 2020
Messages
1,009
Reaction score
995
Location
Colorado Springs, CO
Welcome back to the party. From the NAR website:

  1. High Power Certification is required if a person wishes to:​

    1. Launch rockets containing multiple motors with a total installed impulse of 320.01 Newton-seconds or more, or
    2. Launch rockets containing a single motor with a total installed impulse of 160.01 Newton-seconds or more, or
    3. Launch rockets that weigh more than 53 ounces (1500 grams), or
    4. Launch rockets powered by motors not classified as model rocket motors per NFPA 1122, e.g.:
      1. Average thrust in excess of 80.0 Newtons
      2. Contains in excess of 125 grams of propellant
      3. Hybrid rocket motors”
In another words, yes, you would need certification to launch at a sanctioned event
 
Top