Ordinarily, a set of plans must be purchased for each engine built, but for schools using our plans for a class project, you need to purchase just one set of plans for each class, regardless of class size. So if you have 1 class of 100 students, then you need purchase just one plan set. If you have 5 classes of 4 students, you would need to purchase 5 plan sets. Additionally, when the projects are complete, we request that you send us a class photo with all the engines and students in a photo. We like to post these on our forum.
We do accept purchase orders, however, the first one must be for plans only. This is a small, part-time endeavor, and I do not have the resources to perform credit checks. After I receive payment for the first PO, I will then accept PO's for hardware/parts.