nose weight

Nope. You are wrong. Any motor that exceeds the MR specs is a HPR motor. MR motors can not exceed any of:

1) 160 NS 2) 62.5g propellant 3) 80N average thrust

So the F101, G33, G75, G104, and G125 among others are all HPR motors requiring the user to be L1 certified.

In addition, if the model surpasses any of these limits, it's also HPR:

4) 125g propellant 5) 1500g overall mass

Bob Kaplow NAR # 18L TRA # "Impeach the TRA BoD" >>> To reply, remove the TRABoD!

This is a rather brief summary.

Also incorrect, for multiple reasons. The total impulse is beyond what is covered in the MR safety code. The propellant mass is over 125g. Thus it's not only HPR, but complex HPR requiring extendes safe distances.

Bob Kaplow NAR # 18L TRA # "Impeach the TRA BoD" >>> To reply, remove the TRABoD!

Silly. (Fully NARbitrary)

Silly. (DOT-E-7887 basis)

Silly. (CPSC basis)

Point.

Should be 125g PERIOD.

Jerry

See?! The only FEDERAL limit.

It seems to have been the intent (for better or worse) to exclude from "Model Rocketry" any motor that the CPSC would want to restrict to "children 18 and over".

-dave w

For worse.

Maybe so. It always struck me as a weird constraint to put on the safety code... why _would_ it be a Bad Thing if a few "Model Rocket" motors fell into the CPSC "not for little kids" category?

I thought the Safety Code was intended to be a guide to safe practice for fliers of all ages rather than a specific guarantee of "Government Approval For Children"...? This rule is probably not very consistently followed in the field, and doesn't seem to add anything practical to safety!

(G125-5 would make an ideal pre-test motor for a level 1 bird to be flown on an H128-6... I guess one would just have to lend the rocket to one's cert witness and let him fly it on his card for the test flight.)

-dave w

Before the change the G125 was certified!!

Except, of course, for this one:

(See 101 CFR 101.22 for details...)

- Rick "What, me pedantic?" Dickinson

The symbol for nanosiemens is nS.

The symbol for newton-seconds is either "N·s" or "N s" with an uppercase N, a lowercase s for seconds, and either s space or half-high dot between them.

There is supposed to be a space between the number and the unit symbols as well (e.g., "125 g" not "125g").

Gene Nygaard

They already do. All G motors exceed the CPSC limits, and can only be sold to adults over 18.

Bob Kaplow NAR # 18L TRA # "Impeach the TRA BoD" >>> To reply, remove the TRABoD!

The G125 was always certified as an HPR motor...

Bob Kaplow NAR # 18L TRA # "Impeach the TRA BoD" >>> To reply, remove the TRABoD!

Bob does that to troll for the grammer police. Looks like he caught you. 8-)

I found the post valuable.

This should be in the FAQ.