After a season of very sporadic flying, I finally got some serious time in with my "move-up" airplane - the Hangar 9 UltraStick 40. Mine is powered by a Saito .62 (my first experience with 4-strokes).

After trimming it out I started "cutting loose" a bit but noticed a pronounced "howl", especially with the stick cruising at high speed on the downline.

Another club member showed up today with his US120 with another 4-stroke and it too, had it's own distinctive sound.

Love flying the US, it penetrates the wind better than my venerable trainer (Sig LT-40) but slows down for landing just like a trainer.

And, what would be the best prop for this combo? Currently running an APC 12-6. Would a 13-6 be better? 12-7? I'm taching 9800 on the ground with the 12-6 and 15% fuel.

My boy shown here prepping MY Stick. He flies his own Mini UltraStick w/Park 480 and 11-7 prop.