Author Topic: Build threads look fun (Read 60413 times)

Dave_Trible · « **Reply #200 on:** September 22, 2013, 09:19:40 AM »

Re-thinking the .60 pipe setup.......

Jeff Traxler · « **Reply #201 on:** September 22, 2013, 10:39:26 AM »

Splended idea Dave.You could call it Downtown Brown

Lauri Malila · « **Reply #202 on:** September 22, 2013, 12:44:54 PM »

That looks like the famous Metkemeijer .77 engine. Where did you get one? L

Dave_Trible · « **Reply #203 on:** September 22, 2013, 01:08:41 PM »

Lauri it's a Brown Junior C made in April 1937. I'm actually going to build a 1939 Tiger Shark G-line like in the AMA museum for it and fly it for fun/demo, although I'll put a two line system in instead of flying it from a fishing pole. That Brown is too valuable to risk screwing up.

MarcusCordeiro · « **Reply #204 on:** September 22, 2013, 01:13:24 PM »

Nice engine!!!

Marcus

Lauri Malila · « **Reply #205 on:** September 22, 2013, 01:50:39 PM »

Oh, should've looked more carefully. I can now see some differences. L

Dave_Trible · « **Reply #206 on:** September 22, 2013, 01:53:03 PM »

What's old is new again! Interesting setup Lauri!

Dave_Trible · « **Reply #207 on:** October 22, 2013, 07:41:22 AM »

An update to say we'll be getting back on this within a couple weeks. I got sidetracked. I've been at the new flying field when I can be and getting a new club started, Sky Kings of the Ring, KC Chapter. Thinking to make this a larger regional club with local chapters. There are many lonesome island flyers out in the Burgs and Villes who might like to join a club. With the net it's now possible. A chartered club must have at least 5 members. This way the lone flyer can enjoy club benefits including insurance for flying site owners. Working......anyway.... Built two of these Flying Clowns with Enya .19s for club trainers and decided to build myself a new Sukhoi profile for winter flying here. KC winter flying consists of a couple flights every two weeks during a rare 46-50 degree warm afternoon. It might be muddy, wet or icy so messing with the pipes and carbon props in the brittle cold for a couple quick flight doesn't appeal. My Sukhoi with a Enya ss .40 will be the alternative to not flying at all. Should be flying this by next week so back on the Desperados. Bob Brookins in Des Moines reports his Desperado is coming along. His is getting the PA .65.

Dave_Trible · « **Reply #208 on:** October 26, 2013, 06:24:20 AM »

Sukhoi..

Dave_Trible · « **Reply #209 on:** October 29, 2013, 02:09:45 PM »

Getting close. Covered the Sukhoi today. In the photo the wings are still wet. This is a study in different covering for different reasons. You can see the carbon for the fuselage to make it stiff. The flaps and elevators are covered with light silkspan to cover grain. Jap Tissue on the stabilizer for light weight and very little shrinkage to prevent warps and Plyspan on the wings for toughness given all open bays. It will get one coat of Certified tautening clear then non-tautening thereafter. Hope to fly it next week and clear the bench.

john e. holliday · « **Reply #210 on:** October 30, 2013, 10:33:46 AM »

Looking good. May be a little muddy out at the new circle tho.

Dave_Trible · « **Reply #211 on:** October 30, 2013, 09:35:07 PM »

With dope drying on the Sukhoi I got the Desperados up on the table tonight for the first time in a while. I made wing tips and mounted my reference blocks as shown on the wing using the incidence meter to get them parallel with the wing centerline. These will be the major point of measure to get all other components aligned and the controls set up. Only when I'm ready to cover the wings will I cut it away.

Dave_Trible · « **Reply #212 on:** November 03, 2013, 09:28:35 PM »

Tonight I got SU-26 done and ready for winter practice. Didn't do much on detail with it since this will be a work horse not a show horse. Now I can get back to the keeping the main thing the main thing. Hope I get the chance to fly this in the next week. I'm sensing it a little nose heavy but we'll see.

Dave_Trible · « **Reply #213 on:** November 03, 2013, 09:29:10 PM »

Dave_Trible · « **Reply #214 on:** November 03, 2013, 09:29:39 PM »

john e. holliday · « **Reply #215 on:** November 04, 2013, 08:55:42 AM »

Looks great in the pictures and I know it will look better in person. Let me know when. just have to remember to pick up grandkids from school.

Dave_Trible · « **Reply #216 on:** November 08, 2013, 07:45:46 AM »

Getting going again. I decided to go back to the built up sheet covered flaps I used for years. I had been using 1/4" sheet with carbon which are tortionally stiff enough but wouldn't stay straight over time. The first Desperado has had at least one flap changed out three different times. I don't remember having many of these problems with the built up flaps. I'm also trying something new. The outer 5" of each flap will be a separate section which are joined with a 1/16" wire joiner and can be 'tweaked' independently from the rest of the flap, but moves right along with the flap and aren't stationary trim tabs.

Dave_Trible · « **Reply #217 on:** November 08, 2013, 08:14:57 AM »

Here you can see I'm making that modification to one of the existing Desperados.

MarcusCordeiro · « **Reply #218 on:** November 08, 2013, 09:16:47 AM »

Cool "tip" Dave...

Marcus

Dave_Trible · « **Reply #219 on:** November 11, 2013, 07:51:48 PM »

Boy this business about earning a living is sure getting in the way of my building time. Should be outlawed. Tonight I'm sheeting the wing flaps. The 1/16 sheet was glued to the flap core leading edges yesterday and blocked flat to dry. Now I spread the sheets to run cement down the ribs and along the trailing edges.

Dave_Trible · « **Reply #220 on:** November 11, 2013, 07:52:27 PM »

Dave_Trible · « **Reply #221 on:** November 11, 2013, 08:00:53 PM »

Now pinning them down on the board with a shim to get the trailing edge in line with the leading edge. I've long wanted to build a holding fixture for this operation but have yet to do it.

Dave_Trible · « **Reply #222 on:** November 13, 2013, 02:29:18 PM »

With the inner flap sections mostly complete I have tack glued the outer flap sections which are solid 3/8" on and have drilled/relieved the leading edge to insert the 1/16" music wire joiners with epoxy. Once set I can sand the outer sections to match the inner and then cut them apart other than the joiner. For today after I glue these they will be set aside and I'll built the stabs and elevators.

Dave_Trible · « **Reply #223 on:** November 13, 2013, 07:21:12 PM »

The second stab framed up. Just needs center sheet and shaping.

Dave_Trible · « **Reply #224 on:** November 13, 2013, 07:26:23 PM »

A little trick I use sometimes. The outer flap sections need to be shaped down to match the inner sections. So that I get a consistent thickness at the trailing edge I cut 1/8" strips of 1/32" plywood and tack glued them on the trailing edge of both. Now I can sand to the plywood and not go too far. When done the plywood strips are removed and a perfect edge remains.

Dave_Trible · « **Reply #225 on:** November 14, 2013, 06:59:40 AM »

The next steps are where I go seriously politically incorrect. You will see me dare to join the flaps, hinge them to the wing before its in the fuselage and before the airplane is covered and and finished. Then you will watch me commit the extreme dastardly act of connecting the controls solidly with no adjustable gizmos.

Dave_Trible · « **Reply #226 on:** November 19, 2013, 03:53:04 PM »

Today we've joined the flaps and elevators with control horns.

Dave_Trible · « **Reply #227 on:** November 19, 2013, 03:55:12 PM »

I'm cutting slits in the stab and elevators for hinges. Here is one of those fixtures I made to cut straight and centered.

Dave_Trible · « **Reply #228 on:** November 19, 2013, 03:57:09 PM »

After inserting each hinge in the stab we drill a 5/64 hole through to receive a toothpick pin.

Dave_Trible · « **Reply #229 on:** November 19, 2013, 04:01:12 PM »

Half a toothpick is shoved in after a shot of Gorilla glue. After they set the toothpicks are trimmed off with big toenail clippers and sanded flat. Nothing more is required to hold the hinges in.

Dave_Trible · « **Reply #230 on:** November 19, 2013, 06:08:55 PM »

The elevators are joined on, pins installed and a little final shaping done. Ready for binnus.

Dave_Trible · « **Reply #231 on:** November 19, 2013, 06:13:40 PM »

Tail of the tape (tale of the tail?)

Dave_Trible · « **Reply #232 on:** November 21, 2013, 06:11:41 AM »

Hinging of the flaps. Since the hinges protrude through the back of the 1/4 sq. trailing edge and the glue holes show I am glueing them from the backside and not pinning these. I WILL pin the other end into the flaps.

Dave_Trible · « **Reply #233 on:** November 21, 2013, 06:14:02 AM »

The pushrod is retained with a wheel collar. These will get a little JB Weld as well before they are sealed up in the fuselage.

Dave_Trible · « **Reply #234 on:** November 21, 2013, 06:17:38 AM »

On the scale. With landing gear and flaps I get 16 oz. each. Wish they were less but it is what it is. They are pretty big and need to be pretty solid for me on the grass field.

Dave_Trible · « **Reply #235 on:** November 21, 2013, 06:18:55 AM »

The wings are ready.

Dave_Trible · « **Reply #236 on:** November 21, 2013, 06:19:51 AM »

Chopping out fuse sides.

john e. holliday · « **Reply #237 on:** November 21, 2013, 08:26:52 AM »

Looking good Dave, now when is the weather going to co-operate so we can fly?

Dave_Trible · « **Reply #238 on:** November 21, 2013, 08:44:22 AM »

Sure don't know Doc. Charlie Reeves is supposed to come visit and bring airplanes to fly over Thanksgiving. Haven't heard from him recently but I hope the weather cooperates. I got a couple flights last week. You may have to meet up with him depending on my crazy work schedule.

Matt Colan · « **Reply #239 on:** November 21, 2013, 09:29:21 AM »

That pin method for the hinges is very interesting! I may have to try that out on a future plane.

It's looking good so far Dave! Makes me miss the shop at home and messing around with balsa and building planes.

Dave_Trible · « **Reply #240 on:** November 21, 2013, 10:10:14 AM »

Matt it never gets old. I have to kick myself out of the shop to go flying when I can. Never enough time.

Dave_Trible · « **Reply #241 on:** November 21, 2013, 07:58:00 PM »

Tonight I finished cutting the sides and 1/16" plywood doublers. Some don't use ply doublers here but I still believe in them. I don't want the .76's torquing the nose off or bouncing off on the rough grass rollouts.

Dave_Trible · « **Reply #242 on:** November 21, 2013, 07:59:04 PM »

Will epoxy the sides on and call it a night.

Matt Colan · « **Reply #243 on:** November 21, 2013, 08:16:50 PM »

Quote from: Dave_Trible on November 21, 2013, 07:58:00 PM

Tonight I finished cutting the sides and 1/16" plywood doublers. Some don't use ply doublers here but I still believe in them. I don't want the .76's torquing the nose off or bouncing off on the rough grass rollouts.

For what it's worth, my grandfather sees the nose twist on my Trivial Pursuit with a 76 RO-Jett in it when I start it up. That's with 1/32" ply doublers. Probably would be best to go with 1/16" in the future with that motor

Dave_Trible · « **Reply #244 on:** November 21, 2013, 08:36:11 PM »

Side doublers on and weighted with granite slabs to flatten.
Matt the Jett .76 is sure a potent twister. The force even to start it over the .61 is quite noticeable. I'm going to back way off on the use of carbon to save weight but I will still put the .5 carbon on the nose back to the wing high point for stiffness.

Dave_Trible · « **Reply #245 on:** November 23, 2013, 08:46:22 PM »

Not much tonight but here I'm making the motor mount assemblies down flat on the granite. I'm using 1/2" sq. motor mounts. Don McClave gave me that look when I was lifting, er, buying the mounts from Tom Morris at the Nats. He told me the 3/8x1/2 were adequate. I thanked him and told him my airplane has a short nose and I needed the wide mounts for fuel tank capacity. Not sure he bought it but.... I'll lighten them later by drilling holes down the backside.

Dave_Trible · « **Reply #246 on:** November 23, 2013, 08:48:57 PM »

Here are sides where I glued up the doublers yesterday.

Dave_Trible · « **Reply #247 on:** November 23, 2013, 08:55:17 PM »

Lastly for tonight I pulled the Enya ss.40 off the Sukhoi and am putting that new FP on. Not super thrilled so far with that Enya. I'll work with it but don't have time now. I know I can make the FP work for me chop chop! The Enya still seems too tight after two hours run time. Also vibrated more than I liked. That might have been that big spinner I had on it but I'm on to other things for now.

Dave_Trible · « **Reply #248 on:** November 24, 2013, 08:19:58 PM »

Dave_Trible · « **Reply #249 on:** November 24, 2013, 08:20:37 PM »