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Knoll53's blog
Posted by Knoll53 | Jun 13, 2015 @ 01:58 PM | 1,436 Views
Here is the current 48" wingspan x 60" long version.
Single fin
Higher aspect ratio wing with a wing strake
Posted by Knoll53 | Jun 06, 2015 @ 06:25 PM | 1,065 Views
a more floaty version
Posted by Knoll53 | May 11, 2015 @ 01:17 PM | 3,440 Views
At 20 oz. AUW this little plane will have a 13oz./s.f. wing loading. With a 16" chord, this should be flyable most days of the year. my guess is that it will fly in a 12mph wind at the beach.

jet - core cut (1 min 28 sec)

Posted by Knoll53 | Oct 28, 2014 @ 04:06 PM | 2,406 Views
This is an evolution of the SW-2. Same airfoils but with a different plan form and flap layout. This layout should be more versatile with flaps that are only slightly pitch positive.
Posted by Knoll53 | Oct 11, 2014 @ 05:48 PM | 2,587 Views
Spent a few hours trying to be a hero and fly with a high performance aft CG, then moved the CG forward to find a better handling plane. Elevator throws reduced to minimum. Nice little hyper stall with flaps and full nose up.

SW 7 ... Forward CG (1 min 25 sec)

Posted by Knoll53 | Oct 10, 2014 @ 12:48 AM | 2,594 Views
Pulling back with full flaps is not such a smooth ride.

SW 7 tapered flaps testing (0 min 45 sec)

Posted by Knoll53 | Oct 06, 2014 @ 12:20 PM | 2,895 Views
With the potential of lots of highly cambered wing, this one could be a floater, even at 10oz. /s.f.
Posted by Knoll53 | Oct 05, 2014 @ 06:43 PM | 3,359 Views
Flaps are working great now.
So rekit #7 has stretched out the flaps to be full length which requires a bit of nose down mixing with the elevons. There was just a little too much nose down for these flights, which is the safe way to go. This configuration works great. It can fly slow now with flaps and can pull a high angle of attack for final landing flare. As originally hoped for, the flaps provide higher lift at a slower speed.....
SW-7.......... full length flaps (1 min 18 sec)

Posted by Knoll53 | Sep 24, 2014 @ 11:04 AM | 2,633 Views
I'm finding some advantages to full length flaps which are pitch positive.
Posted by Knoll53 | Sep 13, 2014 @ 07:22 PM | 2,936 Views
Final round of flap testing after they were lengthen towards the root by over and inch. Pitch response is a problem with flaps. Even modest nose up input causes a stall. If flies OK without flaps.

Razor's Edge - Flap test after body work (3 min 57 sec)

Posted by Knoll53 | Sep 07, 2014 @ 07:03 PM | 3,165 Views
3rd sighting in 6 weeks of a pack of 3 California Condors. Most video lost to auto focus. One of them dropped out and landed while the other 2 disappeared into the distance for 20 minutes, then they returned and soared around the perched one. I left after 1/2 hour and the perched one was hanging tough.

California Condors at Garrapata State Park (2 min 30 sec)

Posted by Knoll53 | Sep 01, 2014 @ 07:22 PM | 2,778 Views
Flying in calm conditions finally settled on 5% static margin for the most aft safe CG. At nearly 12 oz/s.f. and a 4" airfoil, that's about as daring as I get. The flaps proved to induce a little nose down in the calm conditions, which made it difficult to fly with a high AoA for final flare. This plane needs to move even with flaps. I'll add an inch to the flaps before final finishing. Nickels formula was not that far off.

Soberanes, no wind. no thermal, so lots of testing (6 min 13 sec)

Posted by Knoll53 | Aug 31, 2014 @ 09:44 AM | 2,893 Views
Final layout with field tested "nearly" pitch neutral flaps.
Posted by Knoll53 | Aug 30, 2014 @ 11:03 PM | 3,073 Views
Today found a little choppy lift and just put the nose down a bit and let it cruise............this plane is much happier when it's moving. The flaps are 2" shorter now and happily are pitch neutral. They are an absolute requirement for a wing this skinny. There is a learning curve for the tiny flight envelope, but I'm beginning to get it.

Razor's Edge in choppy lift (2 min 1 sec)

Posted by Knoll53 | Aug 24, 2014 @ 07:33 PM | 3,466 Views
Down right windy today which apparently make the local wildlife frisky.
Air Plank and the hawk (2 min 14 sec)

Posted by Knoll53 | Aug 24, 2014 @ 07:04 PM | 3,365 Views
Again some condors flew through in mid afternoon. Only got a few glimpses with the new camera.
California Condor & Air Plank (1 min 21 sec)

Posted by Knoll53 | Aug 23, 2014 @ 11:28 PM | 3,107 Views
Posted by Knoll53 | Aug 17, 2014 @ 08:11 PM | 3,293 Views