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turboparker's blog
Archive for May, 2012
Posted by turboparker | May 31, 2012 @ 03:33 PM | 6,321 Views
Here's my first-ever RC ROW flight. What a blast! She has plenty of power, however the added drag & weight is definitely noticeable. The floats shift the CG slightly aft on my airframe. Not enough to cause any problems, but just enough to be a bit tail-heavy for a Cub. I moved my homebrew, lightweight Hyp 240 pack forward approximately 10mm, which turned out to be about right.

Although there is something about seeing a Cub on floats that makes a person smile - there is something about flying a Cub on floats that makes a person grin from ear-to-ear - and keep on grinning for hours afterward!

Eflite UMX Carbon Cub on floats - my first-ever ROW flight! (8 min 53 sec)


Now that I have established baseline performance on land & water, it's time for a 5030 prop.

Joel
Posted by turboparker | May 22, 2012 @ 04:48 PM | 7,076 Views
Hi everyone,

Yesterday was a perfect flying day. I spent the entire day & evening at the field. I got in plenty of stick-time on the CC with the modified elevator pushrod. It made a significant difference on my plane.

For those who are looking for more elevator authority, I highly recommend the pushrod mod. Sure, the plane could still use a bit more up-elevator - but the mod made enough difference on my airframe that I'm satisfied.

UMX Carbon Cub w/elevator mod - touch & goes, full-stall landings, figure-8s with half-flaps (12 min 10 sec)


Joel
Posted by turboparker | May 20, 2012 @ 06:46 PM | 7,316 Views
The CC is a bit shy on elevator authority, so I decided to modify the elevator pushrod to see if I could get a bit more up-elevator for power-on & power-off flares. I'm hoping that it will make 3-point landings a bit easier. I cut off the U-bend & fabricated a straight section of rod to replace it. This reduces flex somewhat, and it keeps the pushrod from rubbing on the bottom of the horizontal stab when it's located in the innermost hole on the horn. It appears that I now have maybe 10% or so more up-travel. No flying wx, so I have yet to try it. Tomorrow looks like a great flying day, with a 3-4 MPH breeze blowing straight down the runway. I plan to shoot some flight-test video.

Here's a clip of the mod:

Increasing elevator authority on the Eflite UMX Carbon Cub SS (1 min 15 sec)


Joel
Posted by turboparker | May 15, 2012 @ 01:15 AM | 6,767 Views
Was a perfect evening for flying the CC. Here's a clip of me shooting touch & goes, three-point landings, half and full-flap landings:

Eflite UMX Carbon Cub - low & slow, touch & goes, 3-point landings, half & full-flap landings (8 min 13 sec)


Joel
Posted by turboparker | May 15, 2012 @ 12:40 AM | 9,231 Views
Given the flurry of questions this plane has generated regarding the use of flaps, flight-trimming, landing techniques, and ground-handling - I decided to put together a checklist for those who may be new to scale planes and/or planes with flaps. If you are experiencing difficulties such as ground-looping, difficulty flaring, sluggish control response, odd behavior in turns, or handling problems with the flaps extended - here are a few things to check:

  • Visually inspect the alignment of all flying surfaces with respect to the fuselage & each other. Also check the alignment of the tailwheel with respect to the rudder. For best results, any visible misalignment should be corrected before proceeding further.
  • Be sure that the plane remains motionless during the first 5 seconds after connecting the battery. The plane can be on its back or in any other position during initialization, provided that it remains motionless during the process.
  • Move the aileron pushrods to the innermost or second hole out. Move the rudder & elevator pushrods to the innermost holes. If the plane seems overly sensitive, try adding a bit of expo, rather than reducing throw - as there will be times when full control authority is needed.
  • Mechanically trim the plane so that little, if any tx trim is required for straight & level flight in zero wind at 50-75% throttle. AS3X interprets excessive trim (more than a few clicks) as
...Continue Reading
Posted by turboparker | May 10, 2012 @ 08:55 PM | 7,195 Views
I decided to have a wind-surfing session with the CC. Wind was 8-16 MPH. I had a blast! The CC handles the wind much better than any of the other undercambered UMs - including the Gee Bee. Of course, the Beast 3D handles much better in the wind and can handle far more wind than any UM plane (except for possibly the Mig 15), but the CC is very impressive in the wind - especially when one considers the undercambered wing.

Eflite UMX Carbon Cub SS in an 8-16 MPH wind (14 min 15 sec)


Joel
Posted by turboparker | May 09, 2012 @ 12:20 AM | 9,035 Views
Picked up an Eflite UMX Carbon Cub SS today.

Got everything set up & mechanically trimmed. I have fully proportional flaps on the right-rear slider of my Futaba 10CHP, with a switchable 5-point flap-elevator mix on switch D. I moved the rudder & aileron pushrods to the second hole from the inside & moved the elevator pushrod to the third hole from the inside.

I checked to see how my Hyp 240 2s packs fit. There was plenty of room to adjust the CG fore & aft of the recommended 27mm. I tried my Hyp 320 2s 'Babbelbatt' & it fit right in with no problem at all. With the pack all the way back, the CG is 28mm, so there is no problem getting the CG right.

Spooled her up & noticed that the prop was out of balance. A piece of clear packing tape on the inside of the light blade did the trick. Packed up & headed to the field.

Wind was out of the NW @ 3-6 MPH. A perfect evening for a maiden!

I used one of my homebrew Hyp 240 2s packs for the maiden. Measured CG was 27mm. Lined her up, rolled into the throttle, and she was airborne within a few fuselage lengths. Made a few passes to check the trims, and everything looked good. I did notice that I had the CG just a bit aft of where I'd like it. Flew for 8.5 minutes. Only used 140 mAh, which is just 58%. So, that would be 11:40 to the 80% discharge point with a Hyp 240 mAh pack., or 15:30 to the 80% discharge point with a Hyp 320.

This plane is just about perfect right out of the box. It doesn't even need...Continue Reading