Long enough so the load can't contact the aircraft.
500 pounds
Helicopter design specs refer to this as an External Load. Commonly referred to as a "sling load". Some helicopters use a hoist to lift objects such as a Search & Rescue helicopter. This is a hoist load.
The Supporting unit is responsible for the initial rigging of a sling load. It is then the Load Master's responsibility to check the load for deficiencies before actually shipping it .
In large helicopters that's possible. it depends entirely on how it has been rigged.
Fm 10-450-3
A transformer requires a 75-kVA minimum load in order to be set.
2
2
By weight.. one strap or chain per 5,000 loads max, and additional straps or chains if you feel they're necessary. Length of the load also determines number of straps, and there should be at least one for every five to six feet of load length minimum, regardless of the weight.
There is no minimum
Standard load is roughly 400 punds or 60 gallons
A big one.