First of all, a voodoo will be a little tough for a 1st control line plane.

Modern 25's will fly that airplane quite well. In fact, I use 25's in airplanes larger than a voodoo for speed limit combat (80mph or less). The voodoo isn't comperive for competition anymore but great for ripping around as a sport plane.

While I have s soft spot for Fox engines, I would use a modern 25, or what I had already.

OS 25, If on a bladder a Os 10 remote NVA.