I'm building one myself so I've been reading threads. Have copied useful information to a folder in notes and just cut and pasted here. I think some of this is from Dave W but generally find it useful set up information:
Ultra Flash Settings
As the UF is such a popular model this topic on flap settings/crow etc is going to go on and on.
I have found the UF the most pleasant of my jets to land so far.I have posted my settings on this thread before but here they are again and in my opinion are just perfect.
All measurements at tip.
Take off Flap 27mm ( - 1mm down elevator mix)
Landing Flap 75mm ( -5mm down elevator mix)
Crow on full FLap + 6mm
+ 1mm up trim on elevator for normal flight.
CG 232mm from LE cut line (tanks empty,ATU full,wheels down)
I found operating manual travel settings for aileron too powerfull so reduced to;
Ailerons +9mm/-10mm (up/down) 40% expo.
Rudder 45mm each way (40% expo)
Elevator +10mm/-11mm (40% expo)
If you go with these setting you cant go wrong and will have a very pleasant and easy model to fly.
Phil.
FLAPS: Take off 25-28mm. Landing 95-100mm both figures measured at the root, trailing edge of each flap. The Ultra Flash requires down elevator with flap. Take off 0.8mm and Landing 4mm measured at the elevator trailing edge tip. Exact figures will be affected by balance position.
CG: Gear up 220-225mm back from the wing/fuselage joint.
They are on the update sheet!
My figures are :
The flap settings for the Ultra Flash. Take off 25-28mm (1-1 1/8”). Landing 95-100mm (3 ¾” to 4”) both figures measured at the root, trailing edge of each flap. The Ultra Flash requires down elevator with flap. Take off 1mm and Landing 4mm measured at the elevator trailing edge tip. Exact figures will be affected by balance position.
My model checked on Sunday was 232mm full of fuel.
I'm probably update the manual and say for people to start with a little less flap and increase to personal taste. Many people flying UF models will be experienced in deciding their set up, when I test flew my UF October 2010 I had practically no data but went with my preference of a tonne of flap and I have not changed the setting from that day. When I test flew my Classic Flash in 2006 I had a tonne of Flap and hated the elevator feel, so reduced it and cam off the power even earlier. Then Little Stevie said we should try CROW and it was a revelation on the CF, my model still flying with it now. I didn't add CROW to the UF when I built it because of the bigger flaps and different wing, I've never felt it needed it. The second or third UF I test flew was set up by an ex CF owner who used the same basic program and he left the CROW in and I didn't like the way it landed. In the end we reduced the CROW down to 5mm raised ailerons and 80mm flap and he liked that.
If you want High Alpha approach go for (on landing setting) 60-65mm flap and 8-10mm raised ailerons, but you will need more down elevator and I have no data as I still prefer my set-up.