ORIGINAL: Cobra1
I put a ST3000 in my Patty and with a good 18x10 prop the performance is great. This combo weighs just over 14lbs. This is a cheap setup as ST3000 can be had for around $150. It will hang on the prop but pulling verticle is marginal - I don't do much 3D stuff so I am very satisfied.
Don't forget the $70 OS 7D carb that you need to make it run right. Also don't forget the Cline regulator at $60 so that you can put your tank on the CG.
Your back up to $300 again.
I've had all the big kats. They put out power--but they are also thirsty.
If anyone thinks the Saito 2.20 is thirsty--try the ST3000 or the 4500.
Those things will suck down 24oz in less than 15 minutes.
Your cost per flight with one of these things is about $3 or $4. You get 1 flight for $3.
You can mix up a gallon of gas and oil for that price. 24oz on a 40cc gasser will last you longer than you want to fly it. I'm guessing about 45 minutes.