Coaster Questions
 

Does anybody know why the old Coaster motors had an outer paper wrap, in which you cut off the packaged end on the nozzle end?

I was looking at old pictures and finally noticed there was a broken line around the nozzle end designating that you were supposed to remove it from that point.

What type of paper was it? it looks like a smooth wrapping type paper. Was a simple cardboard tube underneath?

Was it to prevent moisture from creeping up those massive nozzles?

The wrappers aren't smooth like the Mini-Max - they have a rougher texture, more like a Kraft paper grocery bag, or a manila envelope.
The dotted lines are at both ends, like the Mini-Max. The motor tube itself is, again, very similar in thickness and texture to the Mini-Max motor.


I'll try to get close-up photos tomorrow and post them, along w/photos of the old Estes B3's from the other post.

Pics below show the dotted lines around both ends of the Mini-Max and Coaster motors, along with the aptly described 'massive nozzles':

Now THAT is a nozzle!

Thanks SEL.

Wish we could get proper BP high-thrust port-burners like those again.
Nothing but mamby-pamby excuses why we don't.

We need IRON-CLAD hold-harmless agreements between companies and manufacturing employees, not lack of making them.
Just like the NFL needs to do with their players, not some weenie weakening the game.
Both are risky professions. Don't want the risk, DON'T SIGN ON.

Here is a couple pics of Coaster AtomJet.........I wonder what the difference was between the AtomJet and the SuperJets? Anybody have any?

7.5 lb thrust is almost 34 N.... which is a Low E 1.125 OD x 5.25 in length

these were had at the Smithsonian:

https://womenshistory.si.edu/object...sm_A19930483000

entry says 6lb thrust..that's still a respectable 27 N .

SPECULATION:

Centuri differentiated its mid-60s, pre-Mini-Max BP E and F motors between Atlas and Hercules lines:
http://www.ninfinger.org/rockets/ca...65/65cen52.html

End burners and port burners, respectively.

Could the AtomJets and SuperJets label been used to differentiate between Coaster's port and end burners?

Yes indeed, I believe that to be the case. The 1963 catalog shows a new 1.062 x 5 in length end burner. 3.5 lb/s thrust. FMAX OF 3.5 lb/s with a 2.5 Lb/sec sustainer. That's 15.6 N and 11.1 N respectively, That would make it a mid-range D. Add a little more propellant and you got an E.

These evidently became the Atlas/MiniMax .

Compare the Atlas from the 1965 Centuri catalog to the above . Each E just uses more propellant(eg longer thrust time) to get E's of various total impulses.

Almost the same specs. http://www.ninfinger.org/rockets/ca...65/65cen52.html

The Coaster gang rammer equipment used to make their EF motors arrived at Centuri in April 1965.

sometime in 62 to 63, Coaster had started work on the smaller end burners. .

now we know the approximate time frame of the end burners.

Bob Sanford posted a pic of a 5" Superjet just as the 1963 Coaster catalog showed.

https://forums.rocketshoppe.com/att...achmentid=43950
https://forums.rocketshoppe.com/att...3&stc=1&thumb=1

I was reading an old American Modeler and G. Harry Stine was speculating about how the F11 used a "slower" propellant than did the F15/F25.... ie a 60/30/10 mix of BP versus 75/15/10. These are just representative BP mix ratio's. The 1st mix ratio is the traditional mix ratio for Port Burning Sky Rocket, ie Pyrotechnic BP motors from fireworks, which the F Coasters were based upon.

You can also get similar effects in terms of FMax and Favg by altering the length of the core, leaving the core size the same.

Jsut found this in the Sept/Oct 1963 American Modeling magazine:

G. Harry Stines sez, " Coaster is out with 3 new model rocket engines. According to manufacturer specs, they produce 3.5 pounds of peak thrust and 2.25 pounds of sustaining thrust. They are the same diameter of the standard Coaster engines, but only 5 inches long. Claimed durations include 2 seconds, 4 seconds, and 6 seconds.

Durations means thrust durations.