ORIGINAL: Cambo
Speedster, i agree that %15 might be better but i need it to get any 3d out of this plane. I am scraping the bottom line in power at the moment and want more power. I have spent a little over a year and 1/2 trying to get this thing running well on the bottom end, i have tried different props, fuels, and glowplugs. Bottom line is this airbleed carb just doesn't perform well for 3d. Wich i why i am seeking a new, and more powerful engine.
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I'm with the Saito .82, .91, 1.00 crowd. You can find good deals on these engines occasionally.
Two-strokes that were not made specifically for low rpm, torquey 3D performance, are not going to have the smaller carb and torque tuned ports that will satisfactorily compete with a glow four-stroke as far as 3D flying is concerned.
While the OS FL-70 is a good engine for what it was designed for - low end beginner four-stroke - it isn't really a good 3D engine. Which you now know. It wasn't advertised to be anything other than an entry level four-stroke engine. It serves that function well.
I lean toward the Saito .82 engines for powering .40-.50 sized two-stroke designed models. I like the low weight, small size and the throttling and power of these engines. Why carry a lot more weight for only a tiny bit more power?
I like the Magnum .91 four-stroke and have a couple myself, but then you are right back to flying something similar to the FL-70. It's not a first string engine power wise and it is heavy. Save the Magnum for other uses. Like the FL-70.
If you really can't afford a Saito or YS at this point, consider the SK-90 two-stroke engine that Kangke sells. It swings a big prop and is ported for low rpm running. From what I have heard (Turk1 & Ed Moorman), it does 3D very well, in spite of being a two-stroke and it will run great on 5 - 10% nitro fuel. Plus you just can't beat the price.
Ed Cregger