Espritmodel.com Telemetry Radio
hoffboy's blog
Posted by hoffboy | Mar 01, 2009 @ 01:14 PM | 3,156 Views
Finally completed my EVA Sport after a LONG winter build. Flies like a DREAM. She's powered by an E-flite Park 400 spinning a 10x7 prop with 1300mAh 3S FMA LiPo. A 9 minute flight yesterday at half throttle took the pack down about half way, so I'd say she's quite efficient. WOT gives verticals of about 100 feet before stall. I've never exceeded 12 amps through the Castle 18 amp speed controller, so I think this power system is a keeper. She's VERY snappy, flies inverted hands off, and is generally just a super great sport plane...goes right where I point her and stays there awaiting further instruction. One warning for those considering this plane...she's a REAL floater. I use low rates on the elevator to help bring her down, but so far I need about three passes to get her low enough. She just wants to fly and fly and fly! A very small touch of throttle to minimize autbraking, a hair of elevator, and you can grease it no problem. Just takes practice and a delicate hand.

Here's a couple of pics. Note the fogged up canopy, which is what happens if your kid's black paint is slow to dry and you get in a hurry to fly...but I'm sure I'm the only one who has ever jumped the gun to get in the air .

EDIT: I've had a couple of questions about the covering. It's Rit-dyed silkspan with Minwax Polycrylic (three coats, lightly sanded between applications.) The white (actually off white, but this photo is blown out) is rattle can Krylon over the silkspan. Cowl was just painted naked with no primer, three coats.
Posted by hoffboy | Apr 30, 2008 @ 09:31 PM | 3,745 Views
Well, here's pretty much the "final" Cub all dolled up and ready for her third maiden flight. I know there's only supposed to be one "maiden" but I count flights after structural changes as essentially maidens if there's significant risk involved. Here's how the first flights shake out:
  1. Original build with ailerons--flew great but was tail heavy. My heart was POUNDING on takeoff!
  2. Removed wing struts and installed carbon fiber rods on top and bottom of wing--flew REALLY great, but still tail heavy (compensated with three quarters taped in cowl). My kid said, "Dad, it looks like you're tying knots in the sky!"
  3. Painted, pinstriped, and forward fuse wall battery mount reduced to push battery weight forward. She's STILL tail heavy, so the three quarters are back in the cowl--hope to "maiden" her tomorrow. Stand by for a flight report.
UPDATE Flew three times today:
  1. Sunrise: (photo) Gorgeous morning, but Cub was very touchy. Thought I could avoid exponential and dual rates, but I was wrong.
  2. Lunch: Programmed in dual rates and exponential. Flew on soft setting and had MUCH more discreet control, smoother landings, better low speed stability.
  3. Evening: Two quick flights (two batteries) with very good control and one picture perfect landing.
Summary: I'M HAPPY! (now time to rig up the camera and floats!)