20 x 10 @ 7400 RPM

But RPM can vary with location, climate & even 2 of the same engines by the same manufacturer.

I don't own a ZDZ 40...yet. I'm just basing it on what I've seen & heard from others in this forum, and elsewhere on the Internet. I've seen videos of a DP Extra with a Moki 2.10, and with a ZDZ 40...the airplane took off from a hover with much more authority with the ZDZ 40 in it.

I'm always open to any new information that I can learn, and welcome the input whenever I can get it...but you can't argue against a video. But then again, depending on where the planes in the video were flying...that could have made a big difference in the performance as well.

I'm just saying that the Moki 2.10 & the ZDZ 40 are close enough in weight & power, that the savings in fuel costs makes the ZDZ a very good choice...especially if you WANT to get into gas. Which I do.

Thanks for the advice, though.

Mark