ORIGINAL: Dean Pappas
Hi again,
I don't know where the RPM sweet-spot for an FZ70 is, but it cannot be more than 10,000 or so.
What that means is that you can run up to a 13'' diameter prop without problem.
My guess (and this is only a guess) is a 13-7 prop. Try it for a start.
Hello those of you with experience with the FZ70 ... what size prop are you running and what is your ground RPM?
If you could tell us whether you think you are loading the engine heavily with your setup, or not, please add that information as well.
I did see my buddy Matt run a YS 63 on a 13-7 and it was just a teeny bit lugged down, but handled it well. No, I don't remember the RMP.
Regards,
Dean
Dino,
Around 9500 on 22% nitro/19% oil. A very sweet running little engine.
The DLE 55 experiment has hit full gear. The break-in prop was my 22x12 hybrid. Just not enough prop in my set-up.
I re-drilled one of your 3 bladers to fit the DLE but it was no go. Decided not to run it....felt a bit weak in the hub area and I felt it wasn't safe to even try. Just got a new Mejlik 20x12 3 blader in service. The engine has never been happier. Extremely strong and quiet set-up. The guys at field I flew at today commented how electric like this set-up is in terms of quietness. I guess they are used to flying mufflers with hard mounted engines so their frame of refernce is skewed. Truth is that when anyone else was flying at the same time, the only time I heard my engine was at full revs
After break in is completed I think the engine will pull a 21x12 3 blader