ORIGINAL: Hossfly
std22, JW is correct for the average AMA member.
In addition, simply get your Club to designate you as an Introductory Instructor pilot, special procedure, and you can then instruct (Buddy Cord) any non-AMA individual for 30 days.The procedure costs $5 per year, and there are paperwork requirements, however it provides options as there are no aircraft restrictions concerning whose model.
Check with AMA or look up the docs. in the AMA document files. I don't have the numbers right here, but you can find them.
I am a instructor in this program and they will allow up to three instructor per club i belive. It's great for getting more folks involved in the hobby.