Russian strap-on boosters

The Russian rockets such as the ones used for the Soyuz have the strap
on boosters oriented so their axes angle into the core rocket whereas
US rockets have the strap ons axis parallel to the axis of the core.
Why is this?
Do the engines of the Russian strap ons orient straight up and down or
are they aligned with the axis of the strap-on?

On Apr 13, 5:36*pm, Pat Flannery wrote:
On 4/13/2011 7:20 AM, Frogwatch wrote:

The Russian rockets such as the ones used for the Soyuz have the strap
on boosters oriented so their axes angle into the core rocket whereas
US rockets have the strap ons axis parallel to the axis of the core.
Why is this?
Do the engines of the Russian strap ons orient straight up and down or
are they aligned with the axis of the strap-on?

The bases of the strap-ons are angled a bit, but the engines themselves
are mounted straight up and down:http://upload.wikimedia.org/wikipedi...5/Mir-9.jpg/23...

Pat

Why this difference of "Style"?

On 4/13/2011 7:20 AM, Frogwatch wrote:
The Russian rockets such as the ones used for the Soyuz have the strap
on boosters oriented so their axes angle into the core rocket whereas
US rockets have the strap ons axis parallel to the axis of the core.
Why is this?
Do the engines of the Russian strap ons orient straight up and down or
are they aligned with the axis of the strap-on?

The bases of the strap-ons are angled a bit, but the engines themselves
are mounted straight up and down:
http://upload.wikimedia.org/wikipedi...30px-Mir-9.jpg

Pat

On Wed, 13 Apr 2011 08:20:43 -0700 (PDT), Frogwatch
wrote:

The Russian rockets such as the ones used for the Soyuz have the strap
on boosters oriented so their axes angle into the core rocket whereas
US rockets have the strap ons axis parallel to the axis of the core.
Why is this?
Do the engines of the Russian strap ons orient straight up and down or
are they aligned with the axis of the strap-on?

The fire through the vehicle's center of mass, as do the US strap-ons,
through gimbaled engine nozzles. The point end merging with the core
was just some long-ago design philosophy. Some do that (Ariane 5 and
Atlas 5) other's don't (Shuttle, Delta, H-II).

Brian

On 4/13/2011 10:59 AM, Frogwatch wrote:

The bases of the strap-ons are angled a bit, but the engines themselves
are mounted straight up and down:http://upload.wikimedia.org/wikipedi...5/Mir-9.jpg/23...

Pat

Why this difference of "Style"?

Not really sure; the boosters themselves are direct descendants of the
G-4 IRBM, which was designed by the German rocket scientists that the
Americans didn't get under Operation Paperclip:
http://www.astronautix.com/lvs/g4.htm

Pat

On 4/13/2011 4:30 PM, Brian Thorn wrote:
On Wed, 13 Apr 2011 08:20:43 -0700 (PDT), Frogwatch
wrote:

The Russian rockets such as the ones used for the Soyuz have the strap
on boosters oriented so their axes angle into the core rocket whereas
US rockets have the strap ons axis parallel to the axis of the core.
Why is this?
Do the engines of the Russian strap ons orient straight up and down or
are they aligned with the axis of the strap-on?

The fire through the vehicle's center of mass, as do the US strap-ons,
through gimbaled engine nozzles.

No, they fire straight down; look at the plans of the vehicle I linked
to, or video of a launch.
And the four man chambers of the RD-107 engines used in the strap-ons do
not gimbal. Pitch, roll, and yaw control of the vehicle are handled by
two smaller engine chambers on each of the strap-ons, and they only
swivel back-and-forth in one plane of motion, rather than gimbaling:
http://www.ninfinger.org/models/vault2007/R-7/Rd107.jpg

Pat