What the thread found

• Back-mounted vest configurations create a longer lever arm from the sled to the socket block than front-mounted vests, increasing stress on the upper arm segment and socket block.
• Extending the arm further away from the body increases stress on the upper arm and socket block.
• Back-mounted vest restriction of shoulder joint movement may cause hard bumps or shocks to the socket block in some positions.
• Steel socket blocks are recommended for use with back-mounted vests instead of titanium ones to handle increased stress.
• The upper bone of the arm is susceptible to failure under the increased stress conditions created by back-mounted vest setups.
• Multiple operators experienced arm failures after switching to back-mounted vests, though some operators have used back-mounted vests with arms for many years without problems.

Depends on

• The relationship between back-mounted vest use and arm failure remains unconfirmed as coincidental or causal.
• No quantitative stress measurements were provided to compare stress levels across different arm models.
• Success of certain configurations may depend on specific arm models and individual operator usage patterns.
• Individual arm failures could result from pre-existing damage or material defects rather than the mounting system alone.

Gear in this thread

G-70catalog

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