The TD .09 is still in production and is available directly from Cox ( http://coxmodels.com/ ). Apparently Cox decided to sell directly in order to compete with foreign markets. They also just lowered their prices (on-line at least). The TD .09 may be a problem if you fly at a field where mufflers are required. Excellent engine.

I have an Enya .09 on my Ringmaster Jr. and a Russian Mk-17 (.09) diesel on my Flying Clown.

Many Clowns are flown with .15's.

The Ringmaster Jr. instructions call for a Fox .25 schnuerle. I am guessing that they intended to promote a new racing event because the Fox .25 schnuerle should haul the full-size Ringmaster pretty fast. That may also be the reason for adding sheeting on the wing. I would recommend an .09-.10.

One additional thought...the Ringmaster Jr.'s wing is built in two parts. Because the wing is rather small, I built the space between them (on the plans) as part of the wing to increase the span just a bit.

Good luck with both the Ringmaster Jr. and the Flying Clown.

George