Which prop do you recommend for tai-ji 60?
The engine will be MVVS 91, probably with long tune-pipe.

I would try a 14-8 pattern prop and then go from there

The MVVS engines have a lot of low end grunt and will pull a lot of prop. Ran
a 13x10 pattern APC with a MVVS .77 so the .91 will probably pull a 14x10
at least.

tommy s

If you use the MVVS tuned pipe for the .91:

APC 15x10 @ 8200 rpm

APC 15x11 @ 8000 rpm

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Schpankme

Schpankme
What software are you using to shows the RPM -prop below?

Scoubi,

Utilizing a "known" value (prop load & rpm) for an engine rpm and prop combo, you can use ThurstHp to evaluate different prop sizes by adjusting the RPM until the HP equals the Prop being compared. - see example

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Schpankme