Try email to John Lynch for an interpretation (address is in the ref
above)

Andy
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I would suggest a letter to your regional council. You will need more
horsepower than John Lynch to settle this question, especially the
towing portion. In your letter, include the relevant regulations and
how you interpret them and your question.

As to the "powered aircraft", my opinion is that a self-launch glider
(that is what it is called in the regulations) has a power-plant and
certainly is an aircraft by the definitions in 14CFR Part 1, but I am
not a regional council, just a CFI and examiner.

Terry Claussen