ORIGINAL: Artisan
ORIGINAL: rccardude04
I have an Ultra stick 40 coming from the local shop, and I can't decide which powerplant to slap on the front of this bad boy. I know Hangar 9 reccomends either the Evolution 46 or the Saito .72, but the 82 is only 1oz more, and appears to have considerably more power. My only concern is, would the .82 have TOO MUCH power? I'm going to use the plane to practice what I've been doing on the simulator as far as hovering, torque rolls, harriers, etc. I also plan on doing the CROW mixing and quad flaps with single ailerons (since I only have 6 channels) although I'm sure I'll try quad ailerons with standard flaps at some point.
I also have a Hangar 9 Twist 40 that everybody reccomends the 82 for, so at least if I got the 82 and nuked the ultra stick, the Saito would still have a home.
Anybody try either of these combos? I'm sure either one will be awesome. But when spending 200-300 dollars on an engine, I want to make sure I make a very educated decision.
Also, a side note, the only difference between the std version and the Black Knight is the color, right?
Any help is appreciated.
Thanks,
-Eric
----------------
I had a Saito .72 that was a super engine. My interests changed, so, like most folks posting here, I sold it to help finance the latest project. Later, recently in fact, I needed a couple of four-strokes for about that size of model once again. I bought two .82s instead of the .72, which ran exceptionally well. Why? Because most 3D flying is done at partial throttle anyway, so why not have a little extra available when it is needed?
Prop selection is based upon a combination of factors, not just engine displacement. Today, fuel selection is just as important as the engine's size and the model's weight/drag. If you're running 30% nitro, you will need more of a load placed on the engine than if you were running 10 - 15% nitromethane.
While we can make pretty good estimates by factoring everything together, in the end, it is what the combination of model, engine and fuel tell us that determines the proper prop size.
Nicely stated Artisan. There are several different props that work well on the 82 but it really depends on your plane, fuel, and how you fly it. I have been using an APC 14x4 on my 82 for quite some time with great results but that's on a 46 U Can Do. It works prefect for the U Can Do but you may find different results with your Stick. The Sticks aren't 3d monsters anyway but more of a sport plane and will do some hovering but really aren't made for that. The control surfaces are too small for good hovering.
Anyway, if you don't want to spend a bunch on several different props to try out maybe you could see if there are guys at the field that would let you try one that they have (in different sizes) and see how it works for you. You may even find that a 13" prop will work for you.
Also I wouldn't bother with a 15" on the set up that you are talking about. It's too much prop and you'll have clearance problems anyway. And yes you may want to get a tach. It's harder to tell your RPM with a four stroke.