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Building Integrity
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Date:  6-25-2018
Number of Hours:  1.00
Manual Reference:  
Brief Description:  Catto vs Silver Bullet

The silver bullet came in the mail and I was able to get a good A/B flight test done and the results were surprizing. The Silver bullet had a higher climb RPM but slightly less climb performance. However, in cruise, the SB would push the bird just as fast but on less RPM. My goal was to get at least 3200rpm on the bullet, but down low I could only get her up to 3080. I really want to use the whole power band of this engine which means dialing in a prop that will give me redline rpm at sea level. This prop just wasn't doing it. I will be holding on to it until I fix the cylinder as there is obviously a compression and power loss that skews the results. Nevertheless I was also able to install the new prop balancer and try the Catto for a good A/B comparrison. The Catto accelerates faster which means less ground roll, and climbs about 200ft. min. better as well and with less RPM. The assumption that a 3 blade prop is better for climb is a solid rule of thumb. The crazy thing is that I was able to climb all the way to a Density Altitude of 13k feet today while maintaining NO less than 1300ft. min!!. That's Double what the 390iS was doing. And then, to my surprise, I could hit 194kts TAS while burning only 7gph at that altitude which makes it very tempting to stay high for long distance trips. One main difference between the 390iS and 520iS is that the 390iS made nowhere near the same speeds up high than it did down low. This new engine seems to not care what altitude I'm flying at with a max spread of only about 10kts. I may be getting a really good ram affect with my airbox design but since I made so many changes, I'll never know the real reason why. But I can easily see a 200kt cruise speed when all my mods are finished.
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Catto and balancer back on

Catto and balancer back on

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13K ft. Dens. Alt

13K ft. Dens. Alt

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13k ft. Dens. Alt.

13k ft. Dens. Alt.

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