I have an Evolution trainer power system (from a hangar 9 alpha trainer) does anyone know How much horsepower it puts out? I've not been able to find that information anywhere. I'll soon be putting this engine on a "raidentech" ultimate biplane and I want to know what to anticipate.

I can't tell you numbers, but they rarely mean anything anyway as different Mfgrs measure HP differently. But what I CAN tell you is this:

I did a review of the Evolution TPS a year or two ago, and one of the things I did was to give it a Power Test. I did this by installing it on a Seamaster Seaplane and flying it from a grass field.

I have learned from experience that only the strongest 46 size engines will pull the Seamaster along grass fast enough to get airborne, and the Evo had no trouble.

Here's the review:

http://www.rcuniverse.com/magazine/a...article_id=153

If your EVO has the flywheel, I suggest removing it for more power. There is a kit that has the new thrust washer, etc from Horizon. Also, loose the 3 blade prop and get something like an APC 11x5 - 11x7. You will see a noticeable difference in power.

The internal dimensions of the Evo Trainer engine are the same as the Magnum .46XLS and the OS .46FX/AX. The displacement is .455. I would suspect it is a Mag .46 with the Evo looks.

The Evo .46 is a longer stroke, smaller bore engine with nearly .47 displacement.

As has been mentioned, horsepower is meaningless on sport size props. The formula is very sensitive to rpm so if your engine is ported for high rpm, you will register high horsepower. A manufacturer can put on a 9-6 prop, or some other small prop, and run a .46 over 17,000 rpm. The torque goes down at a shallow angle so the formla, torque times rpm over 5252, results in a high horsepower. That's good except you wouldn't be running a 9-6 or 8 1/2" prop on your .46 powered sport plane. It's good for advertising, but no good for real world use.

The bottom line is get rid of the flywheel and you have a great and powerful .46 engine.

Thank you everyone for the information, especially the review. I'm looking forward to flying this on my new biplane. Does anyone know the best place to get the flywheel replacement kit?

Horizon Hobby AKA HANGER-9, go to parts (ALL) and you'll find it there.

I posted this before, but it was lost in the server crash, so I'll post it again...

You don't need to replace the thrust washer, you can remove the flywheel from the original.

Just place it over a large socket (Larger than the hub, but smaller than the flywheel) then place a small socket (Just smaller than the hub) on top and tap the hub out with a hammer.