What rating type will the insurer most likely use for a new, experimental aircraft?

For a new, experimental aircraft, the insurer is most likely to use judgement rating. This type of rating is applied when adequate historical data is not available to assess the risk associated with a particular policy. Since experimental aircraft are often unique and may have uncommon operational characteristics, insurers rely on the underwriter's expertise and judgement to evaluate the risk involved.

Judgement rating takes into account various factors such as the design, intended use, and the experience of the pilot and operator, providing a tailored approach to determine the premium for the insurance coverage. The absence of a standard or established risk profile for experimental aircraft makes judgement rating the most appropriate method for determining their insurance premiums.

In contrast, standard rating typically relies on well-documented risks with extensive data, class rating groups similar risks together based on common characteristics, and experience rating adjusts premiums based on the insured's past claims history. Since experimental aircraft do not fit neatly into these established categories, it's the judgement rating that is most applicable.