Author Topic: Future modes of Falcon deliveries from the factory  (Read 46394 times)

Offline IslandPlaya

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Re: Future modes of Falcon deliveries from the factory
« Reply #140 on: 08/16/2014 10:09 pm »
Just as well they are not planning any stages that are infinite in width.  ;)

Offline Lar

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Re: Future modes of Falcon deliveries from the factory
« Reply #141 on: 08/17/2014 04:50 am »
Just as well they are not planning any stages that are infinite in width.  ;)

Right. But my point is that a 15m stage is about 1/2 way to using up the clearances... a 30m stage, mounted on a barge that is shallow enough to not ground a lot, might well be too tall for a 100 foot clearance bridge, or too wide for a 150 foot wide channel. (a shallow draft barge may well need to be wider than the stage by a fair bit to get enough buoyancy)
« Last Edit: 08/17/2014 04:51 am by Lar »
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Offline Burninate

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Re: Future modes of Falcon deliveries from the factory
« Reply #142 on: 08/17/2014 06:52 am »
Just as well they are not planning any stages that are infinite in width.  ;)

Right. But my point is that a 15m stage is about 1/2 way to using up the clearances... a 30m stage, mounted on a barge that is shallow enough to not ground a lot, might well be too tall for a 100 foot clearance bridge, or too wide for a 150 foot wide channel. (a shallow draft barge may well need to be wider than the stage by a fair bit to get enough buoyancy)

Buoyancy is easy.  1m draft x 15 meters width = 15 tons per meter length, per meter draft.  The Falcon 9 manages ~430kg per meter length.  We are effectively discussing a Falcon that's scaled up by a factor of 4 in length and width (a total of 16x);  so around 7 tons per meter length if thickness scales.  An oceangoing barge is likely to have considerably greater than 1m maximum draft;  The Pegasus is designed to 5m draft.

Next to volumetric bulk cargoes like grain or coal, an empty rocket stage is a very lightweight cargo, just unwieldy.

Offline cartman

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Re: Future modes of Falcon deliveries from the factory
« Reply #143 on: 08/17/2014 12:25 pm »
There are 2 bridges with a 55ft clearance in Santa Rosa Sound http://en.wikipedia.org/wiki/Santa_Rosa_Sound:
Those bridges have the lowest clearance of any span over the Gulf Intracoastal Waterway

Brooks Bridge: Fort Walton Beach to Okaloosa Island (55 feet clearance)
Navarre Beach Bridge: Navarre to Navarre Beach (55 feet clearance).

I guess if SpaceX decides to make a >>15m width BFR, they will just have to make their barge travel in the Gulf of Mexico for a few tens of miles.
« Last Edit: 08/17/2014 12:25 pm by cartman »

Offline MP99

Re: Future modes of Falcon deliveries from the factory
« Reply #144 on: 08/25/2014 08:23 am »
Not sure if this was posted before?

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