Moki 180 should easily swing an 18-8 or a 19-8 or even a 20-6 Zinger in the 7000RPM range.

I didn't read your first post close enough. I missed the part about the Bambula. [:'(] Those are good for stirring paint, rowing boats, and spreading epoxy. Not much good for props. They are just too darn fat. You'll end up with a 16-8 Bambula if you want to get any RPM outta that Moki. Junk that prop.

My opinion is that the APC props make a lot of noise and turn a lot of RPM, but they don't deliver when it comes to putting out the thrust.

I'd do this if it was me. Actually, I've already done this. Years ago before I stopped flying big glow engines. Get a MenzS 18-10 or Master Airscrew wood Schimitar 19-8 and try that.

Here:
The Master Airscrew 19-8
http://www2.towerhobbies.com/cgi-bin...?&I=LXAPX3&P=0

The MA Schimitar will put out good thrust and let the engine turn up in the RPM range you need to make good power on 5% fuel or FAI fuel.

Or go here and click on Menz Standard wood props and get an 18-10 or a 19-8. They even make a 20-6 which would put out a truckload of thrust if your engine will turn it. I think it will. I never ran the 20-6 prop on my Moki 180, but I did run it on a ST3000 (also a 180) and it was cranking along at 7200RPM. The Moki should swing it.

http://www.aircraftinternational.com/

I know props are expensive. But, if you get that Cline set up and get the engine tuned--it will easily turn anything from an 18-10 up to a 20-6. Try some different props. Those Bambula props are junk. Shoot--try a Pro Zinger!! Those are better than a Bambula. [8D] I think your gonna be a happy camper once you install the Cline and try a few different props.

Sound off if you need help with the Cline. Myself or someone else can help you set it up if you have trouble. I don't think you will. It's pretty simple to install. You'll have to open your needles a little more than if it didn't have a Cline, but don't worry. Just put the Cline on and tune it to run the best. Take your time on the low end and really tweak on it untill you have it adjusted perfect. With the engine being new--it may take a few more tanks before she will settle down and hold a nice idle. You can run it just the tinniest little bit rich if you need to, but don't be lazy and forget about it. You can tweak the engine in just perfect with a Cline and she'll tick over like a Swiss watch.

Hope this helps.