So, here's the skinny on the Heavy...

RockSim 9 says it will fly, and not too poorly, on B and C engines.

Remember that this (and the other) Delta IV models are sport-scale, with a lot of details not shown. I think they could be used to create some very nice scale models, if the details are added.

Enjoy!

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Attached Files

Delta IV Heavy.rkt (96.3 KB, 110 views)

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Craig McGraw

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I am glad to see the Delta IV getting more deserved interest.

Here is my Heavy in action. I have also built and flown the Medium versions as well.

My Heavy uses D12-3 in the outboards and a E9-4 for the core.


edit...Credit to Roger Smith for the great photos www.payloadbay.com

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What is the size of your D4H? Obviously larger than ST-10...

Good shots! Nice model, too. It looks like a model that might 'grow on me' now that I've watched (via NASA TV) a successful flight. The only previous D4 flight I saw video of was the not-so-successful Heavy that had the pogo problem. Glad they got that fixed, because this looks like an interesting family of launchers.

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My Heavy is a 1/74 scale and measures 36 3/4 inches.

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Craig, I believe all 3 nose cones should be the same shape.

I have a Delta 4 Heavy that's been sitting around for a long time now. The 3 boosters and recovery system are assembled, but I have yet to attach the 3 CBC's together or add fins. I used paper wraps to simulate the orange foam, and paper transitions for the boat tails. I used Quest tubing and nose cones that I picked up on clearance at Hobby Lobby, either the 35 or 40 mm size, but I'm too lazy and tired to find out which right now.

You may have given me the push I need to actually complete the thing and see how it flies.

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John Thro, NAR #84553 SR
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John,

I'm studying the ULA Delta IV Payload Guide right now. The 4m cone has a rounded-tip conical, and the two 5m composite cones have a curve in them. It's shallow, but visible to the eyes. I'm using the "Power Series" option to get the proper shape.

You may be right about the two outer cores having the same 5m composite cones, but I'll have to look. It would be in keeping with the idea of "commonality". I'll study the drawings and report back when I find out for sure...

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I have built and flown and have had separations on all of my D-IV's since 2006. If you need some info I am here to assist , please ask I love this hobby and my profession too and am very delighted to see more interest in the Delta IV family.

Here is my thread on my Delta IV's if you would like to see my progress: http://www.rocketryforum.com/showthread.php?t=2799


Heavy Configurations:

The nose cones on the Heavy are not the same in all cases.

The 5 meter nose cones on the CBC outboards and 5 meter bi-sector fairing are Spherically Blunted Tangent Ogive shaped. (Heavy Demo)

The nose cone on the 5 meter tri-sector fairing is a Spherically Blunted Bi-Conic shape. (DSP-23, NROL-26)


Medium Configurations:

The nose cones on the 4 meter fairings are a Spherically Blunted Cone shaped. (all missions)

The 5 meter bi-sector fairing is a Spherically Blunted Tangent Ogive shape. (WGS SV-3 - next flight)

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Delta-IV, thanks!

When I look at the 'typical' CBC cones, they look like they follow the pattern for the 5m composite payload shrouds. I presume Boeing thought about this idea of commonality of components and figured they could reuse the same shrouds to eliminate having to maintain additional parts in their inventory.

Do you have any additional dimensioned drawings to show where all of the joint lines are located? I'm just guessing about their placement right now.

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The CBC nose cones are composite one piece. The 5 meter composite fairings are two peices, so yes there is comonality but different manufacturing processes however.

If you look at the attached scaned images of a releasable poster, this should help out a lot. I can't provide drawings per se since they are ULA proprietary. This was of our Heavy Demo flight.

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I think I was going from the nosecones/fairings on the demo flight, since that's the one I've seen the most video and pictures of.

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John Thro, NAR #84553 SR
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