Estes vs. Aerotech

Most USR BMR series kits are light enough to fly on the E9 just fine. And big enough to not be embarrassed ata LMR or HPR launch.

No. But the folks in Penrose know how to make D48s about the size of an E9! I think I've got one in my collection somewhere.

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

Is that how they made the B14 motors? Did they start with a B6 pressing and drill them, or was the core actually formed over a mandrel in the pressing?

And what _does_ it take to drill/machine a BP grain without risking unintended ignition? (I know that granular BP is first "caked" in large chunks and then ground, but I don't know the details of how that process is done safely.)

-dave w

IIRC they driller C motors. If you drill a 5ns motor you get a motor somewhat less than 5ns.

Distance!

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

I thought my answering this as a tech question was offtopic?

in 24mm?

Yup. From the AT web site:

RMS-24/40 Reload Data D9W 20 10.1 45 4s, 7s D15T 20 8.9 44 4s, 7s, 10s E11J 35 25.0 61 3s, 5s E18W 40 20.7 57 4s, 7s, 10 E28T 40 18.4 55 4s, 7s, 10s F12J 43 30.3 67 3s, 5s F24W 50 19 62 4s, 7s, 10s F39T 50 22.7 59 6s, 9s, 12s

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

david: I've been told they squirt X amount of BP slurry,press to a known presure,squirt,press,squirt,press.... And they probably use a mandrel or simlar setup... I don't know if they driil out the combustion chambers.. Ed Brown(of Estes) , one of the little known masters of BP motor design, had an excellent article in the Journal of Pyrotechnics that described some equations he(?)/estes(they?) use in designing the nozzle/combustion chamber shape and size to achieve various thrusts... excellent article.... so making BP motors has become more a science that an art over the past 30 years

shockie B)

I want to meet the person who stood there and drilled thousands of B14 motors and shake their remaining hand :)

Jerry

LOL!

tim

I stand corected! my apologies for doubting you.

(mental note: get 24mm rms hardware)

It's my single most used reload casing. 22% of my total reload flights.

So many models from so many manufacturers are designed for 24mm motors. The Big Daddy, Executioner, Maxi Alpha, my scaled up Sprite, Streak, Windy City, Tri-F-O, and even one of my crayon banks regularly fly with this casing. And for wacky flights I stuff an E11 into either my Happy Meal or Borg cube. And the E11/F12 make for nice slow lift offs for my Giant Scale D region. It's the perfect motor for rockets like the Saturn-V and V2 and other underpowered extes stuff. It's good for small field lobs on rockets the size and weight of the Graduator, Initiator, etc. And the 3-packs are rather economical.

The 18mm is just too small to be useful and doesn't offer enough different reloads any more. About the only time I use it is in an overweight sport model that only has an 18mm MMT. I've made use of it in one of my crayon banks, a stock Fat Boy (ok, it's not quite stock, it's OY BATF!) and burned up lots of about to lose certification reloads in the Quest UFO.

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