|Belite UltraCub, Sans turtledeck… with 4 stroke engine|
The testing of this new airplane / engine combination has been just been fun.
As this is just Part 103, I’m not required to keep a log, but I wish I would have. Here’s a recap of the experience so far.
#1 — This flight got the plane long enough to prove that a nose forward CG was a disaster. Got into ground effect; immediately reduced power; was unable to flare nose up; tested the landing gear. All good.
#2 — Reset the elevator more incidence down. Improvements over #1.
#3 — Rebuilt engine mount, changed CG substantially, much improvement. Several test hops.
#4 — Reset elevator authority movement with more “up”. Landings are now pleasant.
(time in aircraft is now perhaps totalling 24 minutes, 0.3; — not much)
#5 — Aircraft is now showing good elevator authority; I choose to fly the plane around the pattern. No problems. TT [total time] now 0.5 hours
#6 — one hour flight. TT now 1.5
#7 — one hour flight. Testing to date includes rudder, flaperon and elevator authority; rudderless turn coordination; turns of 45 degrees+, takeoffs, landings; stall attempts; turns about a point. Recorded and uploaded to youtube. TT now 2.5
#8 — thirty minute flight. Testing includes: takeoff and climb to approximate 1000’++ AGL (taking approximately 140 seconds as seen on video); 14 knot headwind on ground without difficulty during taxi, takeoff and landing; many takeoffs and landings demonstrating ground rolls of 40′ or less into wind (you can see this on video); calibration of RPM for various flight conditions; continued evaluation of fuel flow. TT now 3.0 on aircraft. Video uploaded to youtube, and it is available for viewing HERE. Note how the plane always floats down the runway; I’ve got too much approach speed.
Suggested RPM for 45HP 1/2VW engine with a 58×22 propeller are:
* full power producing 2900 – 3150 RPM for takeoff (redline is 3600)
* 2400 – 2700 RPM for cruise
* 1800 – 2050 RPM for final descent