springer's blog View Details
Posted by springer | Dec 09, 2016 @ 05:15 PM | 3,434 Views
I have been seeing guys do some astounding stuff with MPF (and Readiboard at FliteFest!) in larger size planes, so figured it was time to try one myself. In the best scratchbuilder tradition, I started with two sheets of MPF and cut diagonals that gave me what should have been an 8 foot wing. However I incorrectly set the angle of the tips (not parallel to the centerline) and once I sorted that our had a 7 ft span. I TLARed a symmetrical airfoil and did offsets to get the ribs in a constant taper across the half span. Decided to do something different from my usual solid wood spar and build up one. Used Quarter inch square section Pine, poplar or bass ( don't remember which) for top and bottom, tying the ribs to them at "appropriate locations". Then in a fit of creative passion, I decided to make shear walls for the spar out of some cardboard from packing of something. It is like a tablet back, about 1/16" thick. Glued pieces to each side of spar with gorilla glue. This made an amazingly stiff spar, and Probably makes the plane. Wrapped the MPF over the ribs as a skin, and cut out the pocket for motor/prop. Made pocket for battery in nose, Added a leading edge spar and shaped to the airfoil LE. It came together amazingly well, considering no plans of any type. Of course doing a simple wing helps! Build thread here: https://www.rcgroups.com/forums/show...g-MPF-and-wood
7FW android (1 min 43 sec)

Posted by springer | Sep 10, 2016 @ 11:35 AM | 4,386 Views
Guess it is time to come clean and let folks know that we are modelplanefoam.com!

If you aren't familiar with it, here's the link to the thread: https://www.rcgroups.com/forums/show...del+plane+foam
Posted by springer | Jun 03, 2016 @ 08:13 AM | 5,061 Views
Time for our annual sabbatical and pilgrimage to Daytona Beach. This year I only brought two planes, both BluBabys. The weather has been about as nice as it's ever been, winds nearly calm in morning, bright sun most all day, few storms blowing through. I have flown a couple packs off the deserted beach every morning. It's the perfect time, as only a few walkers spread out well, winds low, temps low, and beach smoothed by night out going tides. Here's a video of the 42" BB floating around. Videography by my bride, who gets a bit distracted by our granddaughter, but still gets good video!

Daytona 2016 (2 min 1 sec)

Posted by springer | May 27, 2015 @ 09:19 PM | 8,904 Views
Well, it's now officially Spring (at least I hope so....) and thoughts turn to soaring. Just finished the MPF size of the OSG this last week and spent some quality time in thermals as well as learning how to fly the thing. I added ailerons to the center section of wing. was a bit concerned that they would be ineffective, but pleased that they work "just fine". I'm sure they would be more effective outboard, but for a sport glider, provide plenty of control to roll. I can navigate around the sky well with just ailerons and elevator, although there have been a few instances when adding in some rudder "finished" the turns. The wing has enough dihedral that I can also fly it RET. Gonna be a fun summer!
Posted by springer | Apr 09, 2015 @ 01:44 PM | 9,707 Views
Now that the indoor season is nearly over, I finally came up with the right setup to get a slow floaty indoor plane in a small size. I previously made the half sheet Aeronca Chief (OSA-hs), and flew it with a 10 gm motor, regular 3ch HK rx, and 3.7gm servos. using a 180mah 2s pack for juice. That setup is a "spritely flyer" and fun out side and in the larger venue of USA soccer arena, but a bit too fast to comfortably fly around our church gym. I was tempted to try a brick, but that would mean I would have to start getting Spektrum gear or a new module for my 9x for one plane. Then i saw that Banggood had a brick like RX , motor and motor gearbox/base from one of their little planes available as spares. The RX binds with the hobby king protcol 9x uses. I popped for a set:
http://www.banggood.com/WLtoys-F929-...-p-930768.html $9.99
http://www.banggood.com/WLtoys-F929-...-p-947009.html $1.98
http://www.banggood.com/WLtoys-F929-...-p-930767.html $4.29

Tiny parts to work with, but got them mounted. Still working out the best mounting for the motor/gearbox, but have it hot glued to the foam. It binds to my Tgy 9x ok, although it appears to not have the memory to keep the bind info once turned off, so must be rebound each time it's turned on. A minor hassle. I don't have any of the little 150mah 1s lipos at moment, so found a female micro jst connector in the junk drawer, and made a cable to connect a regular red JST connector and use a 600mah 1s lipo. Exceedingly long flight times!

This litle guy flys a treat! I dumbed down the tx to around 40% expo and 40% low rates (after flying a wild out of control maiden!) and she putters round at quarter throttle at what looks like little more than a walking pace. Perfect for motoring around the gym! Have to get some more for next indoor season!
Posted by springer | Mar 08, 2015 @ 08:44 PM | 10,444 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 | 11,820 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 | 10,976 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 | 14,892 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 | 15,839 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 | 15,813 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: https://www.rcgroups.com/forums/show...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 | 14,228 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: https://www.rcgroups.com/forums/show...1565081&page=2
Posted by springer | Oct 27, 2013 @ 02:17 PM | 14,552 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: https://www.rcgroups.com/forums/show....php?t=2007587

OSB, OSM both got fixes but no cosmetic improvements.
Posted by springer | Jun 23, 2013 @ 08:59 AM | 15,970 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 | 18,832 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 | 18,593 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: https://www.rcgroups.com/forums/show...6#post23684739
Posted by springer | Oct 13, 2012 @ 10:49 PM | 19,590 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: https://www.rcgroups.com/forums/show....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 | 20,788 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)