Knoll53's blog View Details
Posted by Knoll53 | May 07, 2019 @ 10:16 AM | 968 Views
I fly exclusively slope. So the likihood that I ever start my Ka-8 Flair kit is low. That scale plane will turn with it's scale aileron, but will not be anywhere near maneuverable enough to be a fun slope ship at my local rotor filled, paraglider infested coastal flying site. I am a scratch designer/builder so making a few mods is a given. Here is my short list. I am not a scale purist.

Dihedral
­Maintain the stock dihedral. this will not hurt the roll rate enough and the plane just looks better with dihedral. Rudder only turns are possible.

Tow release
­Although I do not plan on aerotowing, install the nose hardware for a vintage loop and pin tow release.

Flaps
­Modify to be fully aerobatic with full span aileron by adding full flaps. Flaps can be used for landing. Possibly make flaps stop at 20% of the half span. this would provide a 80% long aileron and a plenty big landing flap which is not needed for landing since it has spoilers. I am assuming that the Quabec 15% thick, 3 % camber section and 5% camber at tip will be very slow.

Spar
­Beef up wing for high loading. Add carbon spar cap. Top spar cap double the bottom spar cap. schedule based on moment loads. shear webs based on shear loads. wrap joiner with kevlar.

Scale details
­Looks like the FS steel frame fuse is built from 1" tubing or smaller. Replace the kit longerons with hardwood dowels and use MGS epoxy fillets. Also the FS was a full space frame without the giant lite ply formers. Maybe use the kit's formers just as a jig for your hardwood dowels, then after fully braced, cut the formers out. the manufacturer says that the longerons are spruce and you can see from FS photos that they provide a sharp crease in the covering.
For the first flight, no exterior paint or scale detailing, such as instrument panel, seat.
­Paint the fuse framework with heavy sandable filler to fully fill the grain then glossy paint to resemble steel tube.
­Build the wheel and skid to scale and make sandproof.
Posted by Knoll53 | Mar 05, 2018 @ 01:37 PM | 3,077 Views
Had to put the nose down just to be able to penetrate in this moderate wind.

Sinbad - some fly bys (7 min 26 sec)

Posted by Knoll53 | Mar 04, 2018 @ 01:14 AM | 3,750 Views
Just enough wind to barely soar. Except for one loop, the whole day at minimum sink. Hoping for more air soon.

Sinbad - maiden (6 min 51 sec)

Posted by Knoll53 | Feb 26, 2018 @ 06:45 PM | 4,058 Views
The rib-only approach to wing structure really makes for a smooth airfoil. Just as smooth as can be from LE to TE.
Posted by Knoll53 | Jan 27, 2018 @ 07:39 PM | 3,588 Views
time for the sanding block
Posted by Knoll53 | Nov 06, 2017 @ 01:22 AM | 4,021 Views
Beginning to get this one dialed in.
CP-1 in moderate lift (5 min 43 sec)

Posted by Knoll53 | Nov 05, 2017 @ 12:05 PM | 3,891 Views
Well, I have been bitten by the PSS bug and am going to throw my hat in the ring and try to design a PSS ship that will fly at my local coast cliffs, which is modest lift most days of the year. This will cut out the typical PSS ships that you see on RCG with their wing loadings of 25 oz/sf. and up.

The trade off between the desired high speed and the ability to float in light lift will make it less fun than the lead sleds that race around at great slope sites. My little 32” span CP-1 at 17 oz./sf. and is quite the pig. It cannot even do a loop in modest lift.

If I go with 60” span, low AR, and a 11oz/sf wing loading, I could fly all year round and simply load up with ballast when needed. But that wing loading would be hard to hit with a fiberglass scale fuse and heavy skins on a foam wing. I am thinking of a Mig 3, so it is quite the chunky wing. With my normal construction techiques, it would probably be about 20oz/sf.

Wondering just how hard I need to work to make it flyable and fun for my local site.
Posted by Knoll53 | Sep 18, 2017 @ 12:05 PM | 4,984 Views
A light 4m wing would be fun to fly at a thermal site, but I'm not sure I'd ever finish such a big project. 160" of dual built up carbon spars would really burn the hours.

Also, after I got done throwing carbon and Kevlar at it, chances are "light" is the last thing I'd end up with.

Swf

Posted by Knoll53 | Apr 24, 2017 @ 09:07 AM | 9,434 Views
mock up of swept wing.......so far it looks light.
Posted by Knoll53 | Feb 14, 2017 @ 08:15 PM | 7,992 Views
molded pod with dual spar vacuum bagged wing.
Posted by Knoll53 | Jan 29, 2017 @ 07:10 PM | 7,833 Views
Carl gave me a pulverized Fluffy Bunny. I haven't decided whether to thank him or curse him.

2 broke spars, 1 blown out joiner box, broken nose, broken tail and lots of pulverized wing skins.
Posted by Knoll53 | Nov 13, 2016 @ 01:12 PM | 7,804 Views
new DLG type fuse for Day Hiker wing
Posted by Knoll53 | May 03, 2016 @ 10:08 AM | 9,734 Views
Here is the current iteration of the design sketch for a 7 servo plank.
Posted by Knoll53 | Feb 26, 2016 @ 08:40 PM | 9,307 Views
My Nurflügel program looks like this.
Posted by Knoll53 | Feb 02, 2016 @ 05:50 PM | 10,234 Views
Concept sketch for 20:1 aspect ratio, untapered, swept wing, 22 degree nose angle.

Intended use is for thermal flying and the odd 100mph dive from those thermals.

Target wing loading = 11oz./sf. (30gm/dm)
Posted by Knoll53 | Dec 29, 2015 @ 03:49 PM | 13,183 Views
Just got a new camera that shoots better video, but once Youtube does it's conversion, there will be a loss. This is a test.

Why I didn't go flying today - conc block (2 min 59 sec)

Posted by Knoll53 | Dec 23, 2015 @ 06:55 PM | 10,755 Views
Finally got some good lift out at the coast and got a little test flying in. Need to reduce rates all around.

Jet 48 - good lift (3 min 46 sec)

Posted by Knoll53 | Oct 30, 2015 @ 10:39 AM | 11,159 Views
Jet 48 first flight (6 min 2 sec)

Posted by Knoll53 | Sep 26, 2015 @ 10:56 PM | 11,446 Views
BOT fly bys (1 min 8 sec)

BOT tail slide (2 min 40 sec)
...Continue Reading