I bought one at AirVenture last year. Haven’t jumped a Rotax yet but it started my V8 engine in my Toyota Tundra. If you are attending AirVenture, they may have it as a show special. Mine was $100.00 at the show last year. I also purchased their remote jump cable so I will be able to use the jump pack, if necessary, right from the pilot’s seat. No need to remove any cowlings. The jump pack can also be used to run devices from the usb plug in the side of the pack and it has a pretty bright flashlight incorporated into it. It is lighter than my 3 other jump packs and has a more compact carrying case. If you order one, use the advert on our site to link to their website. 👍