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Posted by springer | Mar 08, 2015 @ 08:44 PM | 1,951 Views
I flew the maiden flight of this indoor plane last wed at our church gym. It was copied of a picture that Rusty Mustard linked to. It's a kit called a manta ray, but looked like an easy scratch build from the pic, so I guessed at dimensions and built my own. It was a surprisingly good flyer, I had to play with rates, as the rudder (hidden under the elevator is small. But on high rates and with a more forward CG, she turned well and flew slowly. The only thing I think I need to do is reinforce the vertical piece that runs behind the "fuse" to keep the H stab in it's elevated location. it cracked at the joint to the fuse at bottom. Perhaps a skewer, CF rod or piece of the strapping along the bottom edge.
Posted by springer | Dec 11, 2014 @ 10:30 PM | 3,372 Views
I finally couldn't resist following antigravity's lead with an upscaled OSG. Didn't go quite as far as he (yet) but stopped at 8 foot span. I had sketchup-ed a plan for the large bird a while ago, and decided to build it from MPF (instead of the 4x8 board originally planned). It worked out pretty well, after I realized that I had not kept the proportions and the fuse was about 15" too short, which made her awfully pitch sensitive. Lengthened fuse and added ailerons and flaps and she's now quite the nice soarer. I have only had her out a few times, but she sure looks majestic against the sky. Not too fast with a TP 2410-08 motor and 10x8 folder on 3s 1800mah pack. She climbs leisurely but surely. floats on thermals well, and at that size I can get her way out to find them!

8ft span glider (5 min 54 sec)

Posted by springer | Nov 10, 2014 @ 10:31 PM | 2,544 Views
finally got around to painting the #17. I had a red solo cup shrunk cowl i made for an Ercoupe that never quite worked laying around, and found it fits the Cessna perfectly, so she just had to be red! I even found a full size in a similar color. Not original, I'm sure, but cool none the less! Still needs her N number which will be N335C (35.5" span). Now I need to get her out and fly to see if I messed up the CG with all that Polycrylic, coffee filters and paint. I was pleasantly surprised that the paint only added .3oz.

12/11/14 update: finally got the N number on her along with some trimlines. I think I'll quit.....
Posted by springer | Mar 30, 2014 @ 05:05 PM | 6,373 Views
finished up the build log on this one today, 3-30-14. She's gonna be a fave flyer, I think if I can get some decent landing gear on her. She already while still "in-white" is a great flyer with four channels and a 3s pack. looks and feels like a warbird. It's time for some decoration. I'm covering her with the coffee filters and Polycrylic for paintability and dent resistance, when that's done, I will have to decide between the grey/green WW2 camo and something else post war. hmmm.......

Here's the log:

4-2-14 update: Well, I decided, go with the blue and OD camo from later in the war when they were escorting bombers over the channel.
Posted by springer | Feb 13, 2014 @ 07:42 PM | 7,448 Views
I first saw this plane as a stick and tissue model plan in Model Aviation. Looked cute and I liked the bent wing shape, thought it would be a nice challenge to build that wing. Of course have to try and fit it onto a single sheet of foam (MPF this time). I built the model in Sketchup, and having the templates, got them laser cut. Man, it is really nice to be working with straight lines and smooth curves I didn't have to painfully create! Build went well, and I got her all ready to fly (made the mistake of paint first, my bad!) and had a fairly good first flight, but all subsequent ones resulted in some catastrophic failure, usually associated with tip stall or loss of orientation and subsequent spiral into ground. Very frustrating! Broke fuse in half several times, finally trashed the entire nose. Many tweaks, including changing thrust angle reducing wing incidence, adding more washout by heating and warping the wing (that was fun!). But the one single thing that made this gal work was increasing size of the horizontal tail! The original tail empennage was right off the threeview and just too small to maintain control. I added an inch to chord and 2 inches to span. Bam! now she flys just as predictable as one could ask, and I think the tail looks more "right" than when to scale. Oh, yeah, I swapped out the 40gram 1200kv motor for a 60 gram 1050 motor which really helps keep the speed up on landing.

The only thing I am still working out is getting a paint...Continue Reading
Posted by springer | Feb 13, 2014 @ 07:18 PM | 7,384 Views
Started a thread on this one in the Scratchbuilt foamies forum, but figured it should take a place here on the blog as well. Several years ago, I downloaded the "plans" for the Mystery Tailless Bipe. they were two letter size sheets of a stick and tissue freeflight version of this somewhat wierd looking plane. Always wanted to make an rc version. Well, this cold snowy winter had got me thinking of indoor planes that will fly inside a gym, so I threw together a twenty two inch span version. Fascinating plane, I set it up with elevons, and balanced CG at 25% of the total wing area aft of Lead wing LE. The thing flys really well. Here's the thread: http://www.rcgroups.com/forums/showt...hlight=mysteri

I can motor around the gym nicely, although it's not as maneuverable as all the nutballs that surround it, but fun anyway. The 5gm motor isn't exactly a powerhouse, but it gets it flying ok for a 5 minute flight.

Here's the vimeo vid:
Mystery Tailless Bipe recreated in 22" span Model Plane Foam (1 min 33 sec)

Posted by springer | Nov 25, 2013 @ 03:40 PM | 6,007 Views
Winter is here in SEMI with a vengeance! So time to get all the indoor flying things out again. I flew the OSR at our church gym and managed with careful throttle use to run a pack through her, but kept feeling that a bit less weight would help slower flight. So a couple days in the hanger produced that: OSR Lite! Haven't flown her yet, but hope to tomorrow. Here's what she came out like:

more info on last page of build thread: http://www.rcgroups.com/forums/showt...1565081&page=2
Posted by springer | Oct 27, 2013 @ 02:17 PM | 6,270 Views
Been getting planes ready for the Horizon indoorfest, and discovered that several of my onesheeters were in need of work, so did some updating:

Also, the latest onesheeter type plane is the QSW Quarter sheet wing. (four fit on a single MPF sheet). Did a prototype that flew well, so decided to tweak the design a bit to get a nicer canopy and still fit the qtr sheet. build thread here: http://www.rcgroups.com/forums/showthread.php?t=2007587

OSB, OSM both got fixes but no cosmetic improvements.
Posted by springer | Jun 23, 2013 @ 08:59 AM | 7,702 Views
This one, the QuickSilver, seems to be "the plane that wouldn't die", or perhaps it's a problem with me that i won't "retire" them. After a recent flight of this venerable bird (Mar 2010!) I noticed a crack in the fuse that upon inspection was a crack nearly through the full cross section! To repair or replace? Aw what the heck, lets repair and refurb! Peeled off the coffee filters, glued up the cracks and reinforced a bit more in the battery access opening. Filled some dents with lightweight spackle. Recovered most of center fuse with fresh wbpu/filters. Fill, sand, repaint. Looks good, but something's missing. Say, i never gave her her ID number! Thanks to a friend with a crikit,she now has her official N number and name emblazoned on fuse.

I also tried a GWS 9050 3 blade prop, and she flys as nice as she looks.
Posted by springer | Jan 10, 2013 @ 08:45 PM | 10,585 Views
Today was a beautifull day to fly in South East Michigan. Winds under 4mph, temps above freezing and mostly clear sky - what could be better?

So had to take the Edge out for another photo shoot, remembering this time to set the cam at correct angle to actuallyl follow the plane, and to push the start button at the correct time.

Got three nice vids, this was the second one, mid pack. Some "tiny spot in the sky" parts but mostly you can see what the plane is doing.

OSE 1-10-13 (3 min 45 sec)

Posted by springer | Jan 01, 2013 @ 09:54 PM | 10,322 Views
I have her to the point that I could do a maiden flight and I like how she flies, although she takes more attention than most of my planes. No dihedral, KFM4 airfoil, she's a point and shoot plane. Gonna be very acrobatic, way more than I can do, but maybe i can learn - assuming I don't trash her!

Build log here: http://www.rcgroups.com/forums/showt...6#post23684739
Posted by springer | Oct 13, 2012 @ 10:49 PM | 11,307 Views
I finally got around to actually building this one, having gotten the parts laser cut months ago. She went together well, (Loved the straight lines and tab/slots that fit ) But I discovered several additional parts were needed and others needed changing so she's not quite a one sheeter (yet) But I have flown her and she's fast for a 2s BW plane. I was afraid I'd have adverse yaw with the aileron servo setup, but it doesn't seem like it will be a problem.

build thread here: http://www.rcgroups.com/forums/showthread.php?t=1750259

here's the vid:
OSM Mr. Mulligan - OneSheeter#11 (2 min 16 sec)

Posted by springer | Jul 26, 2012 @ 02:19 PM | 12,557 Views
I finished the floats and got some video of the bird back on the pond, as I mentioned before, she's a hoot to fly! I haven't quite got the greased in landings right though. (seems to be an ongoing problem with me...) After a full session, I splashed her one too many times and may have toasted one of the esc's, and HK is out of stock, so I guess she will sit in dry dock for a bit! Enjoy the vid:

SuperTwin (2 min 4 sec)

Posted by springer | Jul 22, 2012 @ 08:58 PM | 12,534 Views
got in a first flight off water with the Trainer1.5 cobbled into a sea plane this morning. I figured I should come up with a name more descriptive than the long description in the first sentence, so I like SuperTwin, with the T giving recognition of it's heritage in the Trainer1 concept, since the wing and tail empennage is salvaged from my Trainer 1.5. Anyway, made tip floats from pink foam (2") and dowels, secured to wing with the pvc fuel line trick (works pretty well). I have to say flying off water with a twin is a serious hoot! I can power her out into the pond, stop, then go full rudder (left stick where the motor differential is located right now actual rudder is on rt stick) and give a touch of throttle and she will pivot on the opposite tip float. first takeoff was uneventful. she got on step quickly and skimmed for a few feet before lifting off. tip floats kept her nicely level, but on step they were clear of the water, so no drag or splash. Landings, on the other hand, haven't been as smooth. I seem to come in too hot, and either have to do a skim and go around, or bring her in, pull up and plop her in. Practice..... Now I need to figure out how to do the water plane with operable bomb bay door. Maybe I'll just pull the tape off and see how she goes... No pics yet, but if not too windy tomorrow, I'll try for pics and vids.
Posted by springer | Jun 23, 2012 @ 09:02 PM | 12,934 Views
I finally got all the trim done on the Seabee, which is now officially an OSS, for 24x48" sheet (couldn't fit her onto the ds foam 20x30). And, I got busy at the last minute to build a plane for a candy drop exercise at a friend's Vacation Bible School. Unfortunately the candy drop got scrubbed due to weather and time, but I went ahead and finished the plane anyway. I recycled a Trainer 1.5 (56" span) that I'd built years ago. Hadn't flown it in ages, but it took up lots of hanger room, hmmm, maybe make a full fuse with bomb bay. While I'm at it why not a twin. After cannibalizing motors and esc's from a coupe of other planes, recycling the servos and wires from the original and adding a new tgy 2.4 8 ch rx she finally appeared. Not sure what to call her yet, but I added a step just in case i wanted to do water work with her. (she's too top heavy to sit right at the moment, will need tip floats or sponsons).
Posted by springer | May 16, 2012 @ 08:58 AM | 13,396 Views
I now think I've wrung out all the "issues" with the Seabee. I'd first shortened the float arms, after noticing that both tips were dragging in the water on straight taxiing, and figured that was a prime cause for them being sucked under on speed up. While that seemed to help, I still had a lot of water getting into the prop, and she wanted to rock side to side. I finally added splash rails to the lower edge of the fuse, and reshaping the floats to sharpen the aft "release" tips, she now skims the water nice as can be. I had noticed that essentially all the pics of the full size planes had the splash railsl, so figured they might help....

I'm pleasantly surprised at how well she gets up on step. All my other water planes (three of them) need lots of up elevator to keep the nose up, but with the Seabee, I just increase throttle, and she comes up and skims along, lifts off with just a blip of up elevator. fun to fly on still water!

SeaBee Success! (2 min 57 sec)

Posted by springer | Apr 01, 2012 @ 09:03 PM | 13,796 Views
The latest bit of insanity from Armada is what may become OneSheeter#10, the OSS, based on the Republic SeaBee, a quirky bit of aviation history. Here's the build thread: http://www.rcgroups.com/forums/showthread.php?t=1625525 And here are a couple of pictures. hopefully soon I'll try her off the pond and perhaps even have some video.