I had the same problem with my 125 hp Soob EA81 powered Europa and
after doing the research went to a Catto custom fixed pitch.  WOT speed
instantly jumped from 150 to 175  mph with no other changes.  Climb stayed
the same.

 GLENN CROWDER

Hi Glenn,
I am building a Europa XS mono, and am hopeful of installing a All Alum
13b with the RB end housings. As a guide could you give me an estimate
of your FWF weight with the Soob and any comments about its handling,
stability and C of G  compared to the Jab/Rotax fit.
TIA, Dave McC



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