For those who have the SureFly

[Ragsf15e]

12 minutes ago, philiplane said:

Surefly has timing advance based on MP and RPM. The Electroair only uses MP, and only advances below 25" MP.

To be fair, the SF also only advances below ~25 MP.  They no longer publish exactly the advance schedule, but the early ones had a graph that showed it start around 25”. You’re right they use rpm as well.

[Ragsf15e]

Here’s my temps at peak egt, 10500’, midd OAT.  The SF is advancing pretty good this high.

 

[PT20J]

On 9/28/2024 at 9:06 AM, Ragsf15e said:

To be fair, the SF also only advances below ~25 MP.  They no longer publish exactly the advance schedule, but the early ones had a graph that showed it start around 25”. You’re right they use rpm as well.

FWIW, Jason Hutchison at SureFly told me that they took that diagram down because it was inaccurate.