ORIGINAL: bodywerks
ORIGINAL: Barry Cazier
well...
We ran it for 30 minutes or so. Final numbers were about 6650 RPM with the 21x8 prop. Cyberwolf thought that was pretty good. I was hoping for 7000 RPM. These readings were using an engine that only had 30 minutes run time and using the break in oil mixed at 30:1. Does anybody have an opinion on whether or not the RPM will increase with additional run time and also when I lean the mix down to 40:1? Do you think it will get to 7000?
Barry
Those seem like pretty dismal numbers, considering Evolution's power claims on that engine and that it weighs as much as a DA-50.
Your engine is turning a 21X8 at 6650 RPM...My DA-50, within the first two minutes of running, saw 7200 RPM on a
22X8 prop. Maybe the Evolution is a dog until it's broken in? Let's hope so, otherwise the DA is still the leader of the pack.
I'm building a plane right now (Air Wild 29% Extra) and I'm using a DA50 on it. I think your elevation is about the same as mine, isn't it? I'd love to get a little more power. I'm down to only about 1 quart of break in fuel to go. After that I'm going to Amsoil 50:1 mix. I'm hoping the engine will free up and go a little better. In fairness I'm using the breakin oil that came with the engine. It's the stickiest stuff I've ever seen. Surely when I put something slick in there the engine will perform better. It does fly the CAP very nicely though. My most recent numbers are: steady 19lbs thrust with about 6800 RPM. I think there is a good chance of getting over 7000. But as you said that's with the 21x8 prop. I'm going to be running a 22x8 for starters on the DA50. I have no experience with that engine either so I'm learning as I go.
What speed do you get with your DA after it's broken in?
Thanks
Barry