Last year I built a small F-18 pusher from Model Airplanes news plans. The plans call for a .25 mounted in a pusher configuration. I had a new Mecoa .28 wildcat sitting in the box, so I installed it. It is mounted in a vertical orientation, with the case taped, hooked up to a Perry pump. The fuel tank in on the CG. The engine runs rock solid in all orientations due to the pump. However, the peformance just plain sucks. I'm very disappointed. By the way, I run 15% nitro fuel, so with the pump, I think we can rule out the crummy performance is caused by fuel. Oh, I also have an exhaust diverter installed so the muffler isn't getting the full ram air effect when in flight. I know a pipe will help, but will it change it to a neck snapping missile?

In a similar post, I got a response that I should take the Mecoa and launch it in a lake, or turn it into a paperweight. I can't remember the exact phrase. The writer indicated that he has never had any stellar performance from a Mecoa engine. Is it junk? I think he may be correct.

So, having said that, I need a new engine. I want supersonic perfomance, but I'm not ready to deal with making this thing balance if I install a .60 on the tail. I want to keep the displacement close to what I have now so I'm dealing with huge weight issues. Any suggestions on an engine that weighs similar to a .25 and really puts out the power?

Thanks in advance!

I would look into an OS-32 ...

I agree that the OS .32 makes the most sense, but if you don't mind spending the dough, it will probably take a Jett BSE .30 to give you the supersonic you are looking for.

The ONLY way your going to acheive your goal of having a "neck snapping missle", is to go and spend some of your hard earned money on a motor that's designed for speed and power.

NO "sport" motor is going to get you to "supersonic performance".....

Go here: http://www.jettengineering.com

Gary

At least, rule out the os.32, the Webra .32 is lighter and more powerful.

Try the Jett BSE 30 or 35

Worth every penny, and both out perform most .40 and .46 engines

The BSE 30 AAC engine weighs about .70oz more than an OS 32, but it will turn a 9x6 APC well over 18K rpm.

Very user friendly.... has a usable RPM range from about 16,500 up to about 20,000

Short of that, I'd second the vote for the Webra. Nice engine. Put a Jett-stream muffler on it and it will really sing.

Bob

Thanks for all the sugestions....

Who sells the webra and how much? Does it come with a muffler, or does the performance require a tuned pipe?

Thanks again!

I have bought a Macs pipe for mine, but I haven't tried it yet.
Stock muffler does not contain any baffle, so performance shouldn't be that bad with it.