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Old 09-03-2019, 07:40 AM
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Default SRB separation Ideas for Estes Titan IIIe

Just wanted to pick some brains on some ideas of the best way to have functional SRBs on this model which is actually a clone of the original.

I’m not going to use the Estes fin setup, I will be using clear fins through the wall on the main airframe.

Also just B6 or C6-0 in the SRB’s. I’ll compare burn times with the main motor to make the selection.

Two problems right up front are:

1: popping the nose cones is a problem due to the upper cargo bay being in the way.

2: hinging the SRBs is a problem because they will most likey travel into the exhaust of the main airframe engine upon release.

I’ve got some ideas but wanted to here from you all first.

The pictures are to give you a picture of the Rocket, mine isn’t built yet.
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Old 09-03-2019, 07:53 AM
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If you want to get really fancy, I saw a launch back in the mid 90's at Huntsville's Rocket City Classic where the Titan IIIe went finless without active guidance. Look up YORF member George Gassaway and see if he remembers the particulars. He was at the launch and probably knew the modeler. Other notables at the launch were Vince Hueguele, NAR trustee and Tim Pickens, who went on to build the motor for Burt Rutan's space launch, Dan Coon and Greg Warren, all were with HARA at the time. If you know any of them, they might have some details.
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Old 09-03-2019, 08:01 AM
aeppel_cpm aeppel_cpm is offline
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I popped the nosecones:

https://oldrocketforum.com/showthread.php?t=15364

The build thread is here, too.
https://oldrocketforum.com/showthread.php?t=15092

No problems with hitting the payload transition. Problems with deploying at speed with a -0 motor.
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Old 09-03-2019, 10:04 AM
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You could always go with "rear ejection" on the SRBs.
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Old 09-03-2019, 10:31 AM
aeppel_cpm aeppel_cpm is offline
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That's an interesting thought.

I built my Titian IIIe so that the boosters attached at both top and bottom. They transferred thrust to the bottom lugs and hung from the top lugs. Nosecone separation (with the breakpoint below the lugs) lifted the top off the upper lugs and let the SRB fall away.

Reversing that, so the lugs/posts point the other direction and thrust is transferred at the top and the SRB hangs from the bottom and 'noseblowing' the bulk of the SRB body tube, letting the aft body/motor pull out recovery might be a nifty solution.
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Old 09-03-2019, 05:59 PM
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Thank you Charles for your thought and link post. I actually read with great interest your post yesterday on this subject. Sure wish you hadn’t suffered a Cato.

Those zero delay motors are a concern to. I thought I might get around that with extra long shock cords and wrapping the parachute in such away to delay it’s opening?
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Old 09-07-2019, 10:29 PM
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Quote:
Originally Posted by Flash
Just wanted to pick some brains on some ideas of the best way to have functional SRBs on this model which is actually a clone of the original.
.


John Coker has some interesting ideas, too.

http://www.jcrocket.org/titan3c.shtml

http://www.jcrocket.com/delta2.shtml

http://www.jcrocket.com/ariane6.shtml


Dave F.
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Old 09-08-2019, 05:55 PM
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Thank you! He has some great stuff there that is for sure. I'm using the KISS rule, Keep It Super Simple.
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