John, does this use Vulcanite?

What's interesting is the confluence of folks who have coalesced around Estes to help it flourish.

From 11-25-12 MIT/NAR data:

11.15 lb-sec
0.1325 lb pro
84.15 lb-sec / lb

That's about double the ISP of BP.

When we put Estes motor grains in composite cases with nozzles set to about 600-800 psi initial the ISP was well over 100.

http://v-serv.com/crp/CRm/4-83/CRm.4-83.13.w.jpg

Jerry

I'm sorry but I can't give out any specfic information on the motors composition, packaging or pricing. All this will come out soon enough and it's not my place to give out this information.

John Boren

Congrats! These are 29mm nominal by 114mm nominal so about 1.125 x 4.48". Same size as certified USR SU F's were. The old Estes APCP F used the exact grain geometry as our long prestanding F40/F80 motors.

Well, What I infer from this is :

(1) Composition - They are not "traditional" BP. If they were, disclosure would not be an issue.

(2) Pricing - I anticipate they will be relatively expensive. As a result, they will likely be sold individually.

Just my opinion, based on what I read . . .

Dave F.

Hmm . . . Do I detect a propellant here that could FINALLY allow Team USA to compete against the CZECH DELTA motors and, possibly, give them an "edge" ???

Dave F.

The F15 is traditional black powder. The S&T data states it is.

Attached Files

ESTES F15.pdf (20.5 KB, 122 views)

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I love sanding.

Not sure what Jerry is quoting from, since nothing from the NAR is in imperial units, but if you're talking about the F15, the S&T report says it is black powder, and the performance appears along the lines of black powder performance (as Carl said, comparing to the old Mini-Max F16 motors. F16 was 57ns on 62.5 gms stated vs F15 50ns on 60 gms measured)

Now, the "Pressable AP" propellant that has been described in patent filings and speculated about would be nifty, if it is shelf-stable and can be handled by the current machinery. But only Estes knows.

(note: as far as I know, all Estes-specific propellant formulations have been called "Vulcanite" in patent literature. I don't think this has anything to do with Scott Dixon's involvement in the Pressable AP project)

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Roy
nar12605

Yes, I was commenting on what I understood the "Vulcanite EB-75" to be . . .

Were you referring to this ?

http://www.sumobrain.com/patents/wi...004065332A2.pdf

Dave F.

Yep.

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Roy
nar12605