pcastine
Posts: 130
Joined: 3/9/2004
From: Forest,
VA, USA
Status: offline
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Thanks Mike! And thanks for helping me out with the final checks and getting the plane in the air.
FLIGHT REPORT: I was very surprised that despite looking like a lumbering plane, this one handles very well. Took off after range check, and the plane needed only a little up elevator trim for straight & level; no aileron or rudder required. I think the extra servos were worth it; the plane feels very locked in. Snaps had no over-rotation, and rolls were generally axially. Looking at the ailerons, it seems like the left (aux3) is not tracking exactly with AIL, so I'll have to look into that a little. Very little effect on flight.
The plane balanced perfectly; no down elevator required in inverted flight. This is actually a little too tail heavy for me mostly, as I prefer pattern (IMAC) over 3D, and usually snaps are a little more locked in (for me at least) when the plane is a little nose heavy. The motor has a little too much right thrust (I used the SWB 3 degree mount, probably 2.5 is fine); left rudder is required on the way up.
The plane tracked well, point rolls required almost no rudder. The rudder, btw, is very strong. I did a knife edge loop on low rates with confidence. (Now I get to turn down the rudder more!) There was a little pitch coupling with the rudder, but much less than my Comp-ARF Extra. I'm guessing about 3-4% mix ought to cure it. The elevators, oddly, were not very effective at low deflection until you really moved them off center. I need to take some expo out of my radio; speeding up the elevators off center should help. On 3D rates they performed fine.
Uplines are not a problem (except for the left rudder). Power is very good with the DA-150 & K&S tuned pipes. If you see Mike's video, its kind of hard to judge, but the uplines were very authoritative, with rolls & a snap on the way up not being a problem. Unfortunately, the motor quit about 6 minutes into the flight, and I had to dead stick it. The final was down wind (never good) and the plane came in very hot, which was surprising; I thought it would slow down better. It ran off the end of the runway, but no damage. Turns out the diaphragm on the carb was leaking. This DA has been in storage for over a year, the diaphragm must have dried out.
So, looks like I get to wait until next weekend to start trimming out the plane, after my carb rebuild kit arrives.
But for now, some more photos...
Pete
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Printable Version
All Forums >> RC Airplanes >> Giant Scale Aircraft - 3D & Aerobatic >> Aerotech R/C Models Support >> RE: Yet Another Yak! 
RE: Yet Another Yak! - 
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. From the video, the rolls looks very axial. Waterfalls look tight too. 
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