I just purchased a second hand Eagle 2 with no engine or electronics. Goldberg recommends a .25 to .40 glow engine. What are the considerations in choosing between the smaller or larger engine. Will a smaller (slower?) engine be easier to learn to fly with? Can you just put a lower pitch prop and achieve the same thing with a larger engine?

It kind of depends on how much money you want to spend. A Thunder tiger .42 or an OS 46LA both are inexpensive and will fly the plane quite well. I had one that had an OS 40FP on it and it was great. As a matter of fact 4 people learned how to fly with that plane and a 10 year old currently has it on floats. You are going to get opinions that you need a bigger expensive engine for this plane for future projects. Well All my future projects ended up with me buying engines for that specific project and the Eagle still has it's origional engine.

I would like to know if it is possible to install an <span class="prod_description">OS FS-72A Four Cycle  that weight 16.79 oz in my eagle 2 instead of my os 46 ax that weight  17.2 oz .  i know that they just call for up to .60 fout stroke . Is it going to be over powered .
 thanks a lot </span></p>

Hi,

No it won't be overpowered just have different characteristics. The four stroke will develop more torque and swing a bigger prop than the two stroke that will rev a bit harder.

Cheers,

Colin

a 70 size 4 stroke would be awesome on an eagle 2....if you have mastered a trainer i wouldnt hesitate if you dont mind spending the cash....if you have never flown before i would be hesitant to recommend you buy an expensive 4 stroke for your first plane, mainly because if you go in nose first the chances are greater that one of the many moving parts may get damaged

the magnum .52 fs wouldnt be a bad one either if you want to go the 4 stroke route, they are on sale for 80 bucks at www.hobbypeople.net

holy crap thats a deal!!

A friend of mine put a .40LA into his and it flew it just fine. It did come out very tail heavy and he had to add quite a bit of weight to the nose, several ounces, I think. The .40LA is no longer made, but the .46LA weighs the same, so it would still require nose weight. You may as well add weight by adding more power. Either a ball bearing .46 or the Magnum 52 four stroke, if you want to go that way. I bet that even a ball bearing .32 will fly it great.

Good luck

I have an Eagle II that I use for training for the last 3 years. I installed a ST GS.40 on it and an 11x5 apc prop. Here's a video of it. It hauls the plane really well for a $49.00 engine. I could go a 10x6 prop but the 11x5 helps slow the plane down some on landings.A Magnum .524s would be perfect for this plane. Anylarger prop and you'll be having clearance problems.
http://www.rcuvideos.com/video/Eli-and-Eagle I would save a 70 4s for a more aerobatic type plane but if you want , you can install a 70 .4s, just way overkill .

It's unfortunate that the Super Tigre GS-40 is now a $74.99 engine, but it's still a great engine.

Thank you for the info guys
My actual plans is to put my eagle II on floats with the os 72a , my thinking is if i have more torque to compansate for the float weight and the resistance of the water.  I think the floats will add more clearance for a bigger prop as well.
I have built and flown this plane for a long time already and i master it prety well , it is a very nice trainer , it can glide for quite a long time if you ran out of fuel , lol .
I have already the os 72a engine and the os 46 ax who is already in it.
thank you .

I've been building an Eagle2 over the winter.  It's going to be powered by a K &amp; B Sporster .45.  Should fit well since it's the one in the drawings and the manual.