RCU Forums - View Single Post - Phoenix Models Sukhoi SU-31 CG and engine Q's
Old 12-04-2005 | 05:28 PM
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da Rock
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From: Near Pfafftown NC
Default RE: Phoenix Models Sukhoi SU-31 CG and engine Q's

Looks really nice. The bars on the underside are going to come in real handy. The stock color scheme looks the same top or bottom. I did a sunburst on mine 1st thing and it really shows up in the air. Every time it gets far out there and I see those black sunrays I grin.

Mine is still new enough that I'm still flight trimming. First flights showed it was stable, maybe too stable and elevator stick position from rightside up to upside down suggested the too stable came from nose heavy. The book said the CG range in 100mm to 120mm which is about 4" to 4.6". I ran the dimensions to see what my old CL stunters flew best at and came up with about 4.5" as the start point for this layout. I moved some stuff around inside and got about 4-3/4" and flew it. It's still steady and inverted takes lots less elevator.

That lead in the nose from the mfg really frosted me off when I discovered it. No excuse for it other than the mfg wanted to use heavy wood. If the thing wasn't such a good flyer it surely would be the last Phoenix for me. BTW, the book also says there isn't any down or up thrust, but their motor mount directions show the mount located for right and UP THRUST! and mine had as much down thrust as right thrust, maybe more. Bet a lot of people wound up with prop shafts way off center in the cowl. Guess that's why the hog out the cowling way more than scale.

Mine is a good flyer nonetheless.