"New" Estes Motors

I'd like to call everyone's attention to the following thread over on YORF regarding some "new" motors from Estes:

https://forums.rocketshoppe.com/showthread.php?t=4039

Thanks to YORF owner and TRF member Ltvscout for bringing this to our attention!

Yay!

Now to just bring back the B6-0...

OH MY GOD!!! This is awesome! I can finally get the Firefly from Semroc and fly it.

Gym_Class_Hero said:

Yay!

Now to just bring back the B6-0...

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It is back. I read it yesterday in a thread here, but I completely forgot what thread it was. Great news.

jj94 said:

OH MY GOD!!! This is awesome! I can finally get the Firefly from Semroc and fly it.


It is back. I read it yesterday in a thread here, but I completely forgot what thread it was. Great news.

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The B6-0 was in my Hobby Lobby today even.

Now if they would only bring back the B14s.

AWESOME!!! Now I can get fresh A10-0T's, the stash I have like to detonate

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Did I mention how awesome I think the reintroduction is?

I'd also like to see the C5-3 brought back as that was an excellent motor for the heavier 18mm kits.

Most Excellent! I've been wanting to build a 13mm Comanche III for some time

Donaldsrockets said:

I'd also like to see the C5-3 brought back as that was an excellent motor for the heavier 18mm kits.

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Of course, the best motor for a heavy 18mm rocket is the D21.....

harsas said:

Of course, the best motor for a heavy 18mm rocket is the D21.....

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Or a D24-4 RMS

harsas said:

Of course, the best motor for a heavy 18mm rocket is the D21.....

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shreadvector said:

Or a D24-4 RMS

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I don't understand why AT offers two high average thrust D motors in 18mm, but none in 24mm. The options there are D15 and D9. A D20-something sure be handy for the 24/40 case.

Doug

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Happy-Dance, Happy-Dance, Happy-Dance, Happy-Dance, Happy-Dance, Happy-Dance.

Wooooo!

Happy-Dance, Happy-Dance, Happy-Dance, Happy-Dance, Happy-Dance, Happy-Dance, Happy-Dance, Happy-Dance, Happy-Dance, Happy-Dance.

Sorry Wes!

doug_man_sams said:

I don't understand why AT offers two high average thrust D motors in 18mm, but none in 24mm. The options there are D15 and D9. A D20-something sure be handy for the 24/40 case.

Doug

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Surface area.

The 24mm slug is short and fat and has less surface area. To make a long slug with a larger surface area would require some interesting tooling OR taking the E slugs and machining huge slots into them and throwing away half the propellant.

shreadvector said:

Surface area.

The 24mm slug is short and fat and has less surface area. To make a long slug with a larger surface area would require some interesting tooling OR taking the E slugs and machining huge slots into them and throwing away half the propellant.

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That makes sense. I always assumed it was for some other reason - eg, an oversight - but this clears it up.

Thanks.

Thinking about it, I wonder if they could cook up some knob propellant (ie, low Isp) that would use the longer E liner and thereby increase the length of the grain and hence the surface area. But I suppose that the lower Isp might mitigate the gain in surface area.

Doug

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shreadvector said:

Surface area.

The 24mm slug is short and fat and has less surface area. To make a long slug with a larger surface area would require some interesting tooling OR taking the E slugs and machining huge slots into them and throwing away half the propellant.

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Well, they could make a Warp-9 load...

Rocketjunkie said:

Well, they could make a Warp-9 load...

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Good idea.

But you lose the option of motor ejection - not a big deal for mid-power and larger - but electronic deployment on D-powered rockets, while certainly not impossible, is a bit out of proportion.


Doug

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doug_man_sams said:

Good idea.

But you lose the option of motor ejection - not a big deal for mid-power and larger - but electronic deployment on D-powered rockets, while certainly not impossible, is a bit out of proportion.


Doug

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Unless there's a way to slow it down a bit. I heard they use catalysts that speed it up. So maybe Warp 9 without one (or more) of the major catalysts they use would be slow enough.

harsas said:

Of course, the best motor for a heavy 18mm rocket is the D21.....

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And this is coming from someone that seemed to be having some really bad luck with them!!!

Just teasing.

doug_man_sams said:

Good idea.

But you lose the option of motor ejection - not a big deal for mid-power and larger - but electronic deployment on D-powered rockets, while certainly not impossible, is a bit out of proportion.

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With a C-slot grain geometry like the other loads, the thrust will tail off a little more gradually. This should allow the delay to stay lit. It's the sudden pressure drop at burnout that extinguishes the delay element.

Maybe they could make it a partial endburner--the lower 2/3 of the graincould have a slot, and the upper 1/3 would be solid. That way it would still have high peak thrust, but it would be very low thrust as the delay is lighting.