Old_Pilot's blog View Details
Posted by Old_Pilot | Yesterday @ 07:49 AM | 2,418 Views
Got the fans mounted and the nacelles assembled yesterday. Filled all the divots with light weight spakling (sp). Spent the morning sanding with 220. Still have more to do. But just for grins I decided to dry fit all the parts. Going to try something new. I usually cover pink foam with brown paper and 4-5 coats of polycrylic. In an effort to save a bit of weight I'm going to try this thick water-based polyurethane. Well see. I'm also going to line the battery compartment with lightweight corrugated cardboard (USPS Flat Rate box board). The nose is a bit wiggly.
Posted by Old_Pilot | Jan 19, 2022 @ 03:39 PM | 3,947 Views
Didn't get a whole lot done today....got the hatches sorted, nose block installed, and the nacelles sanded. Joined the inlet and outlet cones, I'll install the fans and build the nacelles tomorrow. Got my left hip injected with Medrol...the upside is that I know it'll help the bursitis...the downside is that I won't be able to tell when there's a cold front at Little Rock...LOL
Posted by Old_Pilot | Jan 18, 2022 @ 02:16 PM | 7,963 Views
I cut the nose block this morning....Here's how: I printed the plan and side views of the nose block patterns on plain paper, then afixed that to some light weight cardboard (USPS Flat Rate Boxes are perfect). then I glued those patterns to the blank with a very light coat of spray adhesive (M45 was the best, but it's no longer available). Then I cut the side patterns by pulling the blank across the wire....I glued those back on with a light coat of spray, and then cut the top/bottom pattern...pealed everything off, and I have a nose block ready to be finished shaped and sanded. I'll do the same for the canopy.

Here's a link to the nacelles:

Posted by Old_Pilot | Jan 18, 2022 @ 12:16 PM | 8,369 Views
Had to make a new servo tray...took about 10 minutes....got the elevator servos mounted and the aileron servos let in to the underside of the wing. Push rod guides are plastic coffee stirrers
Posted by Old_Pilot | Jan 16, 2022 @ 04:36 PM | 20,987 Views
Got the wings and feathers hinged and assembled. Wing is a modified KFm-3. Steps are at 66% and 33% with (2) 0.156 sq CF spars. Leading edge was beveled and sanded, and the LE tape will soften the edges. A standard KF-3 is 50% and 75% I think....At any rate, a 50-75 KF would get into the ailerons...It wouldn't work. Besides I've flown this wing before, on this airplane...she flew just fine
Posted by Old_Pilot | Jan 16, 2022 @ 02:29 PM | 20,805 Views
I cut this little girl out several months ago with the thought of building her again.....however, the demand for Einzpfeils and StealthStreams took precedence, plus a couple of balsa gliders. Probably going to color her the same as before (see pic). I still have to cut and shape both the canopy and the nose block, but that won't take long. I'll have the wings and the feathers assembled shortly
Posted by Old_Pilot | Jan 16, 2022 @ 11:21 AM | 21,607 Views
Since I've had enough of gliders for awhile, I'm going back to stand-off scale warbird foamies .....(3) to be exact...An S-3 Viking, a CF-100 Canuck (already cut out), and an SU-25 Frogfoot. I've got a drawer full of fans and ESC's....In prep for that, I cut some control horns, this time out of 3mm light ply...the one's I cut out of 1/16 were just too fragile......and I can paint them to match the color scheme of the aircraft
Posted by Old_Pilot | Jan 14, 2022 @ 05:56 PM | 27,446 Views
Down to push rods and control horns......and I may have a way to disguise those ugly #64 rubber bands.....more tomorrow

Well, that didn't work..I tried to "dye" the rubber bands with a dark red, alcohol based permanent ink......unfortunately the ink attacks the rubber and when stretched you can start to see a bit of surface fraying, plus the color loses it's intensity as you stretch the rubber band...but hey, for $2 worth of ink, it was worth a shot.....so I bought some red #64's from Amazon
Posted by Old_Pilot | Jan 13, 2022 @ 01:59 PM | 25,404 Views
6 hours later, I got the bottom of the wing covered.....the transparent covering is even easier to deal with than the opaque....guess I'll do the top tomorrow
Posted by Old_Pilot | Jan 12, 2022 @ 02:43 PM | 31,168 Views
I'm very pleased with the new covering material. Good adhesion, shrinks tight, and you can work the corners without having to cut facets. But I noticed that some of the seams were showing a bit of the adhesive (it's white)......until I wiped it down with acetone.....The best part about this stuff is it's price....MonoKote is basically $4/ft......this stuff is $1/ft, and you get a 16 ft roll for less than a 6 ft roll of MonoKote.

I'll cover the wing tomorrow
Posted by Old_Pilot | Jan 11, 2022 @ 09:14 AM | 29,656 Views
Gonna start covering today.....transparent red for the wings and stab...bright yellow for the fuse and fin....yellow orientation stripes....black trim and decals.......trying a new covering material...Neucover....1/4 the cost of MonoKote..


Agree with keeping the rudder....DUG Mk-1 proved that
Posted by Old_Pilot | Jan 09, 2022 @ 04:27 PM | 32,461 Views
I got the wings joined and the aileron servos mounted, as you can see......had to put her on the scale,,.all the balsa, (4) servos, and the ESC weigh in at 24.5 oz. The motor prop, and battery weigh in at 10.30 oz..the covering and push rods will add another 3 oz, so projected AUW will be 37.8 oz....that yields a wing loading of 37.8oz/4.07 sq ft = 9.28 oz/sq ft........not as light as I wanted, but better than DUG MK-I
Posted by Old_Pilot | Jan 09, 2022 @ 02:18 PM | 30,947 Views
I hope I'm not being too sentimental (or just mental), but while I was waiting for some epoxy to set, I was reminiscing about my career and then retirement. I went from designing and building large industrial process facilities all over the world to....balsa and foam aircraft in my shop in the back yard. Some might consider that culture shock too much to handle....But I've found that I enjoy the design challenges and get just as much joy from scratch building an air frame.....especially when she noses up on her own for the first time and takes flight...The experience is even more special when I can share my madness with you guys !

I especially want to thank Bmatthews and lincoln for their input, guidance, and answering my silly questions....

Keep your nose up in the turns
Posted by Old_Pilot | Jan 08, 2022 @ 03:29 PM | 29,019 Views
Got the outboard panels of the wing built an rough sanded...still have a bit of banjo work to do before I join them, but we're getting there. Aileron hinges are a thin nylon fabric sandwiched between the top and bottom slats of the TE and aileron plates......invisible.
Posted by Old_Pilot | Jan 07, 2022 @ 02:07 PM | 25,940 Views
So, the center section of the wing is finished....except for finish sanding....I like the thicker trailing edge.....I also like the main spar..two pieces of 1/8" lite ply sandwiched together and continuous across the span........That's a 20lb chunk of lead at mid span....no deflection...I'll start the outboard sections of the wing this weekend..supposed to be wet and cold.......
Posted by Old_Pilot | Jan 07, 2022 @ 09:56 AM | 25,175 Views
Well POOP ! I made a mistake......I cut the end of the ribs at 1/4" vertical...for an eighth inch trailing edge....not sure what I was thinking. Apparently I wasn't....easy fix though...I'll just cut a second set of trailing edges and ailerons (they are all on one sheet together) and laminate them on top of the originals.....the upside to this (there's always an upside for me) is that those 1/8" TE's and ailerons were awfully flimsy......I doubt it will make any difference to the wing loading....And as an afterthought, I have the opportunity to laminate fabric hinges......HMMM !
Posted by Old_Pilot | Jan 06, 2022 @ 09:54 AM | 37,003 Views
Got the fuselage all but assembled, elevator and rudder servos mounted, battery tray and strap, and the push rod guides...dry fit the feathers.........Tab A into Slot B makes it go quickly
Posted by Old_Pilot | Jan 05, 2022 @ 09:16 AM | 49,263 Views
Got the feathers assembled, but when I put the small flat ribs in place, they just didn't look right..so I compromised and put some wider ribs in, some 1/8" diagonals, and smaller corner gussets......... even with all that, it will weigh less than the 3/16" original stab and fin
Posted by Old_Pilot | Jan 04, 2022 @ 06:06 PM | 53,313 Views
Wow, got all the pieces separated, de-tabbed, de-furred, and collected into the groups......in the meantime, my supervisors showed up after a long vacation......