I crashed the 'Pirate a few months ago on a landing attempt. Busted it up good too. I had to swim out about 25 yards to fetch it.
I crashed because the plane was just too damn difficult to fly. I wasn't using dual rates (I should have been), and I had the CG pushed insanely rear. With the higher wing loading of the float, the plane was a handful. Agile and fast, but not really a "joy" to fly.
I've added a few inches of wingspan as I planned, and replaced the crappy econocote (really the WORST covering ever invented) with Ultracote (the BEST covering I've ever used), and a few assorted upgrades including inverting the engine. Overall the plane should be much more aerodynamic, have lower wing loading, and fly better overall.
Excuse the low quality of the video, and the polka music. It had been raining all week just as I finished the Seaplane conversion when that video was taken. It was very dark and overcast, but there was no wind or rain, and it was the perfect time to sneak a flight in.
I am in the middle of adding 3" to each wingtip for a slightly better wing loading. With the extra drag and weight of the floats, the plane's low speed handling is pretty bad. Landings are tricky, as you have to keep airspeed up not to stall, but slow enough to be controlled and not bounce off the water.
Wing span will go from 54" to 60", and wing loading should go from 25.5oz/sq ft to 23oz/sq ft. My hope is to tame the low speed handling characteristics, and make the plane more of a joy to fly. I'm improving the wing tip design as well, I hope it helps.
The finicky low speed handling is what lead to a tip stall and crash from about a 30ft altitude. I got lucky and didn't ruin any of the electronics, but the plane got busted up a little. I'm completely re-covering the plane with Ultracote. It had Econocote, and let me tell you what a huge mistake that stuff is. It doesn't stick very well and doesn't shrink very well either.
When I went from an 11x6 to a 12x6, performance really improved. I am happy with the Aviastar engines. My .53 swings an APC 11x6 at a maximum of 12,900 RPMs, but richened for flight setting swings it as a solid 12,600. I haven't tached the 12x6, but I would imagine it's somewhere around 10,500 or better.
Posted by KMKAZE |
Dec 15, 2009 @ 12:59 PM | 2,423 Views
Up until the last few weeks, it had been 8 years since I've been glow flying. I kept a Goldberg Gentle Lady, but even then I flew that perhaps once a year or so.
I designed a plane using my new favorite program called paint.net. It's free, and it's basically the result of someone mating photoshop and windows paint. I saved the file as a png and used tileprint to print the plans.
It took over 2 months to build my plane, the "Irate Pirate"... Supposed to be a simple to build .40 size sporter with a thinnish fully symmetrical airfoil.
The canopy has been redone since this photo was taken. It's curved and looks alot better.
The first takeoff run... on one of our back fields. We have about 300 acres or so, with about 200 suitable for RC flying. Who needs a membership to a flying field?
Since losing the majority of my RC field equipment in a move several years ago, I've been slowly replenishing my lost items. This week it was an electric starter and a tach. I forgot how nice it was to have an electric starter. No more bruised fingers from backfires...It was getting old flipping a hundred times on a cold day by hand to get it to start.
Haven't used my tach yet... going to test it out today. I've never owned one before. It's something I've always wanted though.