Old_Pilot's blog View Details
Archive for September, 2014
Posted by Old_Pilot | Sep 30, 2014 @ 02:03 PM | 4,356 Views
AUW 31 oz

Turnigy 2836/8 1100kV
2100 mah 30 C 3s
9050 prop
HS 55 servos
Pink foam wing core
3/16 PFFB (paper faced foam board) fuse and feathers
Posted by Old_Pilot | Sep 29, 2014 @ 06:51 AM | 4,219 Views
The 2200 kV motor helped immensely, though some initial velocity at launch was required. Best method was to hold her by the top of the fuse and fling her out underhanded at about 30 degrees.....didn't get any video.....but she came back in one piece. 24" WS is not quite enough. Will build another one at Hellberg's design dimensions. A bigger prop would help too.....But she still looked cool coming over the field. Will strengthen the motor mount on the next iteration.
Posted by Old_Pilot | Sep 26, 2014 @ 11:23 AM | 3,874 Views
lots of progress this morning..........decided to do her in silver with markings similar to the F-86...until I tested the OLD piece of silver MonoKote.....oh well, it was only $2.00.......so I used the scraps of what I had leftover from previous builds.
Posted by Old_Pilot | Sep 25, 2014 @ 05:08 PM | 4,169 Views
Sorry the video is so short.....my camera operator dropped my phone.......
had to reduce the elevon throws...but she still flew really well.....

Flew her all afternoon........launch was much easier, and I found that if you pointed up at about 10-15 degrees, throttle up, and just let her go,
she behaved.

Jetstream II Maiden Flight (0 min 42 sec)


I have to rebuild the motor mount system..again....plywood this time
Posted by Old_Pilot | Sep 24, 2014 @ 07:41 AM | 4,294 Views
I've had a couple of requests to publish the plans for this bird......

My notes:

1. Round over the leading edge of the wing.
2. Tab and slot the fins
3. Waterproof (I used (2) coats of clear polycrylic). Water based urethane will work too
4. Add a little up and left to the motor (I used one washer)
5. Maximize the elevon servo throws and add expo for flight
6. Keep your hand out of the prop
7. Canopy pattern is close...trim as required
8. 6mm Depron or 1/4" blue foam would yield a lighter assembly (I didn't have any)...I used 3/16 PFF..Paper Faced Foam board
9. I used tape hinges
10. Jetstream 1.0 balanced about 3/4 " forward of the intersection of the trailing edges of the Klein-Fogleman airfoil. I used a 50% top. Jetstream 2.0 should balance about 1" forward of the same intersection.....the front of the fin terminates along that line.

Canopy hold downs are builders choice.....I glued mine down and cut hatches for internal access

AUW as shown is 27 oz. Wing loading is 7.66 oz/SF

Electrics:

Turnigy 2836/8 1100 kV motor
30A ESC with BEC
HiTec HS 82 MG servos
3s 2100 20C battery

One more thing.. cut in air intakes at the front of the canopy, or add a scoop

Another one more thing......DON'T USE POLYCRYLIC.......BRUSH MARKS !
Posted by Old_Pilot | Sep 23, 2014 @ 04:45 PM | 3,867 Views
30" WS x 34" OAL.....she's a little bigger than Jetstream 1.0. That was based on the abundance of thrust available to me with the motor and prop combo......not going to paint this one.....unnecessary weight. Canopy and fins are a bit larger too. Motor repositioned to amidships and strengthened the motor mount. Control surfaces are now in the prop wash. I'll publish full size patterns as a PDF if anyone is interested.
Posted by Old_Pilot | Sep 20, 2014 @ 05:56 PM | 3,645 Views
Flew the Jetstream this morning and it was quite the experience. Quick and agile do not adequately describe her in flight. Launching her was the most difficult part because of the exposed prop, even though I'd added a "keel" by which to hold her. The biggest flaw in the design is that the control surfaces are not in the prop wash resulting in almost no control until she reached flight speed.... the longest four seconds of my life ! Unfortunately, there is no video. Suffice it to say that I'm going to make several changes. The motor will be moved forward, the control surfaces will be enlarged as will the "canopy". The motor mount will be strengthened too. HS-55 servos will be replaced with HS82-MG's to allow for more throw and increase torque. Exponential can be programmed in to dampen flight commands while still having maximum travel available during launch. An added benefit of moving the motor forward will be to help eliminate the need for nose weight to achieve proper balance.. I had to add 2 oz . I may even add a bit of Tomas Hellberg's simplified thrust vectoring to help with launch.....

Motor: Turnigy 2836/8-1100kV
Prop: APC 8060
Battery: 2100 mah 3S
ESC: 30A
Flight weight: 22 oz
28" WS x 32" OAL
50% Klein Fogelman airfoil
Posted by Old_Pilot | Sep 19, 2014 @ 09:37 AM | 4,369 Views
3/16x1/2 Bass with a piece of 1/16x1/2 x5 aluminum strip, sandwiched, epoxied and riveted. (My father owned a boat company so I've got a gillion aluminum rivets) And it's adjustable.....so long as you don't adjust it too much and work harden the aluminum strip......it'll crack

(4) 3/32" soft aluminum rivets with backing washers.

Solid aluminum spar weighed 2.34 oz....hybrid spar weighs 1.23......
Posted by Old_Pilot | Sep 18, 2014 @ 01:43 PM | 3,399 Views
Since I totaled the Ugly Stik a few days ago, I've been trying to decide whether to build another one just like the first, or something different......decided on something different.....

48 Swept Stik (It was pointed out to me that The Hooker was a 10 degree swept wing version of an Ugly Stik......flight pictures were awesome...hope mine looks that good in the air ) edited 9/20/14

Pink foam wing core, art board fuse and tail feathers, CF spars and a bamboo stiffener in the stab R/E/A/T. May forego the landing gear just to keep the weight down........Cut her out tomorrow....didn't get a chance to fly the Jetstream today...honeydo's
Posted by Old_Pilot | Sep 15, 2014 @ 05:43 PM | 3,326 Views
Have already cut her out.......

Cartwheeled the Stik this morning, like Nadia Comaneci....broke everything except the electrics.....field hadn't been cut due to rain, and I hung the L/G on some taller grass.....she looked like the end of a floor exercise dismount ! Glad I was by myself, 'cause I'd have never heard the end of it from the guys at the field.

Update...should be able to fly her (Jetstream) tomorrow. It'll be interesting to see what the difference in performance is compared to a flat wing ........I used a 50% Kline-Fogelman airfoil.....my first.

She's kind of a cross between a foreshortened SR-71 and a B-2.....
Posted by Old_Pilot | Sep 15, 2014 @ 12:38 PM | 3,442 Views
Flew it this morning....sorta......plenty of watts, not enough kV (1000) for the little prop (5.5x4.75)....always on the edge of stall.....flew like a drunk butterfly

Ordered (2) 2200 kV motors.....should be here Wed.
Posted by Old_Pilot | Sep 11, 2014 @ 11:19 AM | 4,090 Views
Since the combat ship has to wait for smaller components (or a larger airframe) I scaled down the Hellberg Mig 29 to a 24" wingspan and fit the parts to (6) of the 14x18 foam trays .....here's the templates

Cut the decals this morning...

"Stu" has been with me a long time (1975). I did a caricature of one of my superintendents way back when. He's graced a lot of drawings as a "scaled" HIM (Human Interface Model). Most of the time my boss(es) would make me change him to a more ergonomic representation, but he did manage to make it all the way through to "released-for-construction" drawing sets several times, usually causing a chuckle or two.

Used AutoCAD and photo paper....Continue Reading
Posted by Old_Pilot | Sep 10, 2014 @ 02:42 PM | 3,534 Views
David Terrell gave me a stack of 6mm foam trays........so I miniaturized the big blue combat ship....the goal is to make the airplane from one tray, and a bamboo skewer..gonna rain tomorrow, so I'll have time to finish her......
Posted by Old_Pilot | Sep 10, 2014 @ 06:53 AM | 3,428 Views
All,

I had to attend my sister-in-law's 50th wedding anniversary in Columbia MD last week, and, as my wife was part of the planning, prep, and party crew, we went up 3 days early. 'nuff said...

David lives about an hour from Columbia and we'd arranged to try to get together to fly, or something, while I was there, just so I'd have some retreat from 30 OCD in-laws. Well, we spent 2 days flying at his local club field and one day at Udvar-Hazy wandering through aviation history. Winds were light the first time we flew......not so much the second time........a solid 15 with gusts to 20......"exciting" would be a mild description, especially when trying to land...... all aircraft survived, though I bent the L/G on the Stik a few times, and I let the smoke out of a 3S......not sure how.

Long story short......WE had a wonderful time ....despite the efforts of less than mature I-L's who seemed to think that I should be part of the heavy lifting crew....NOT !

C
Posted by Old_Pilot | Sep 01, 2014 @ 11:15 AM | 3,148 Views
Actually, this is the second flight...the maiden was a bit exciting while I got her trimmed.

48 Special Ver 2 Maiden (1 min 58 sec)