RE: 25% Cessna L-19/0-1 Bird Dog build

RE: 25% Cessna L-19/0-1 Bird Dog build
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RE: 25% Cessna L-19/0-1 Bird Dog build - 4/19/2008 3:53:03 AM

RICMOD5634

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From: Fremont, MI, USA
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Better Pictures / I like the color markings. Vietnamesse Air Force

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Post #: 226

RE: 25% Cessna L-19/0-1 Bird Dog build - 4/19/2008 5:17:58 AM

khodges

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From: newton, NC, USA
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Rich, that would be a great scheme to do it would be very visible in the air and get a lot of comments on the ground. According to "The Lovable One-Niner", the camo pattern was tried briefly by the USAF, but then abandoned. It made the FAC aircraft difficult to see from above (part of the reason for camo, obviously) but the fast movers were unable to spot their own FAC. The AF added an international orange panel to the top of the wing and to the turtledeck to make this easier, but then decided to abandon the camo pattern altogether. I don't know how Militarily accurate the polkadot tail and stripe really are I have seen pics of VNAF planes on the ramps in Vietnam with slanted checkerboard in yellow/black on the tail and fuse, but not the dots. I found this same plane in "Lovable One-Niner". As of 1995, it belonged to a guy in Australia. Seems like it is a popular type down under.

There are a couple of unofficial camo patterns that were also used in S.E.Asia. One was a orange/black tiger stripe, and the other was a similar, O.D., black, gray and yellow tiger stripe. I guess guys in the field felt like painting them whatever would hide them the best.

If you spent time at Ft. Dragg

, I guess you also whiled away some free time on Hay Street? (Not that it was "free"

) I went in and out of Pope a fair amount, but that was much later than you (late '80s-early '90s)

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Post #: 227

RE: 25% Cessna L-19/0-1 Bird Dog build - 4/19/2008 6:33:25 AM

RICMOD5634

Posts: 131
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From: Fremont, MI, USA
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1/5 Scale Dawg
Ken: I thought the polkadot's where a little much also and figured it was just added, but searching 74th Tactical wing a saw some A37's with the wing tanks red with white polkadots. I thought I saw an orange glow on the fin of my pic and yours conferms that. I read where that the FAC put a cup around the top strobe so that attack aircraft could see them, but yet not seen from the ground.
Really thankfull for your input, helps to get a grasp on things.

Rich F

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Post #: 228

RE: 25% Cessna L-19/0-1 Bird Dog build - 4/19/2008 9:28:20 PM

khodges

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From: newton, NC, USA
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quote:

ORIGINAL: RICMOD5634

I read where that the FAC put a cup around the top strobe so that attack aircraft could see them, but yet not seen from the ground.

Rich F

I've only seen that on USAF birds. From what I've found, there were lots of field mods not found widespread, or "factory certified". The Mars beacon is usually on the belly of the plane between the gear. It makes sense, from the standpoint of these planes flying over hostile territory, to avoid marker lights at all if possible, but the rooftop beacon would make the plane easier to spot from above, giving the "fast movers" a better chance to spot their FAC more easily. Here's a pic, from "One-Niner", showing the rooftop beacon with the cup shaped shield:

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< Message edited by khodges -- 4/19/2008 9:29:11 PM >

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Post #: 229

RE: 25% Cessna L-19/0-1 Bird Dog build - 4/20/2008 1:07:58 PM

Jim Henley

Posts: 264
Joined: 11/10/2005
From: Omaha, NE, USA
Status: online

Ken,
I am just blown away at the level of detail you and the other builders are achieving. This is off topic, bur... does anyone have any knowledge or experience with the Marquart Charger? I have the chance to purchase one, partially built, including the igniton engine. This is a Walt Moucha Kit, I have no idea how old or anything else about it. Everything that has been built so far looks like it was well done.
If anyone has any knowledge I would appreciate hearing from you, feel free to send a PM so we don't clutter up Ken's thread
Thanks

< Message edited by Jim Henley -- 4/20/2008 1:09:43 PM >

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Post #: 230

RE: 25% Cessna L-19/0-1 Bird Dog build - 4/20/2008 1:10:07 PM

Jim Henley

Posts: 264
Joined: 11/10/2005
From: Omaha, NE, USA
Status: online

On the same topic does anyone have any experience with a Super Tigre 3000S (or S 3000) ignition engine?
Thx

< Message edited by Jim Henley -- 4/20/2008 1:13:11 PM >

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Post #: 231

RE: 25% Cessna L-19/0-1 Bird Dog build - 4/24/2008 8:49:10 PM

khodges

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Well, not getting nearly as much done as I'd like. Springtime yard duty, kids' taxi service, not enough time off work.........you know.

I have the throttle linkage done. I took a piece of 3/16 brass tubing, placed through a hole in the firewall and another through former 3 at the bottom. The servo is mounted on a bracket glued to former 3A, with the servo arm in a direct line back from the throttle arm. The flexible throttle cable fits through the brass tube. The extension of the tube into the engine bay serves to prevent any flex in the cable. All this fits under the cabin floor, which is removable, since the space will also be occupied by the battery packs, receiver, and circuit boards for the lighting system.

1st pic is the engine bay end. I soldered a brace from 3/16 square brass to the tube and screwed it to the side of the engine box. 2nd pic shows the inside end, the flex cable is supported by a small block. A little epoxy there will keep the outer sleeve of the cable from moving. The engine end of the cable will have a ball link.

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< Message edited by khodges -- 4/24/2008 8:52:41 PM >

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Post #: 232

RE: 25% Cessna L-19/0-1 Bird Dog build - 4/25/2008 4:02:18 PM

AIRPLANENUTS

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Joined: 7/21/2003
From: atlanta, GA, USA
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Ken, I like that fancy throttle linkage! Ought to work reliably and smoothly, and looks great doing it! I may have to borrow that idea.......

Rick

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Post #: 233

RE: 25% Cessna L-19/0-1 Bird Dog build - 4/25/2008 11:35:04 PM

redtail

Posts: 267
Joined: 10/14/2002
From: Alexandria, VA,
Status: offline

Looking good Ken, I may borrow the support bracket. My servo and throttle run is of course nearly identical to yours. However, I really like the support bracket on the throttle arm. What is the support bracket you have screwed to your exhaust pipes? Holler at us about that. I'm working in the cockpit, setting up the back end right now. The observer is an Air America (CIA) fellow who is riding along with me getting a close hand look at air/ground support

. Here are a few shots of what I'm doing. Chic

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Post #: 234

RE: 25% Cessna L-19/0-1 Bird Dog build - 4/26/2008 4:43:48 AM

khodges

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Chic, the take-up cable and pulley look great! You certainly haven't been idle, those small details take a lot of time. What figures are you using for pilot and observer? I picked up a full figure guy last week, he's the Hangar-9 pilot for their 1/4 scale Cub ARF. Looks okay, but some work and a new "suit" will make him better, plus the helmet that Vailly has.

The bracket you see, that looks attached to the exhaust, is the brace for the throttle cable. I made a bracket for the exhaust, but it isn't in place in that photo. It will attach to the muffler can and then to the lower engine mount bolt on the right side.

I picked up a .40 size ARF the other day, looks like a 172 Cessna, but is a tail dragger. Just wanted something I could throw in the truck on short notice. It was hanging in the LHS, price was right, had a OS .50SX and all digital servos, and a battery. I put a 2.4 Rx in it, have been getting the throws set up, hope to fly it tomorrow at our sister club's fun fly. Haven't done much to the 'Dog, but hope to get started laying out the wings this weekend, I'm off Monday so I have 3 days to play. All the yard work is done for a bit.

Only changes I plan to make on the wings are to the roots, where I changed the fuse, the flap inner ends for the same reason, and to the flap hinges, which I plan to make from aluminum or thin steel. The flap and aileron control rods will get concealed also. I'm going to make jigs to set up the correct washout. Did you build your wings right side up or upside down? Seems as since the top surface stays "flat" and the bottom surface has a little bit of dihedral change at the flap/aileron line due to the changing chord and cross section, it might be easier to set up building them upside down. Of course, the washout would be "washIN" when upside down. What are your thoughts? I might e-mail Roy and see what he thinks, too. I don't want to make it any harder to build than it already is. I think I may have been subconsciously "dragging my feet" getting the wings started because of this. I certainly don't want to screw them up.

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Post #: 235

RE: 25% Cessna L-19/0-1 Bird Dog build - 4/26/2008 5:32:56 AM

RICMOD5634

Posts: 131
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From: Fremont, MI, USA
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1/5 Dawg
Ken, what is the small brass tube at the bottom next to the fire wall? Maybe a fuel tank overflow?
Rec. new parts today, and as long as its suppose to rain for the next couple of days can get started on fuse.
Rich

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Post #: 236

RE: 25% Cessna L-19/0-1 Bird Dog build - 4/26/2008 4:42:36 PM

redtail

Posts: 267
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From: Alexandria, VA,
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Well Ken, you sent me the picture showing the full scale take-up cable and pulley, so again, I can blame you for slowing up this build.

But I'm really stuck as to how the shoulder and lap belts come together in this particular airframe. I want to try and be as close to full scale as I can be with this first really hard core scale model. Do you know how they come together. I can find no pictures showing this. The 1/4 scale guys are from Vailley, the pilot has the round hard shell hat of the pilots in those days, the observer is a WV University fan and I used Roy's soft baseball cap for him. Ken, I built my wings right side up with shims tucked in the right places. Looked a bit off but it worked once the sheeting was installed. Don't talk about dragging one's feet, trust me, mine are in concrete, yard work, etc. but I believe I have my wife convinced that she should be doing that so that she can have a source of exercise. I believe it is working so far. Until next time. Chic

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Post #: 237

RE: 25% Cessna L-19/0-1 Bird Dog build - 4/26/2008 7:55:45 PM

khodges

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From: newton, NC, USA
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quote:

ORIGINAL: RICMOD5634

1/5 Dawg
Ken, what is the small brass tube at the bottom next to the fire wall? Maybe a fuel tank overflow?
Rec. new parts today, and as long as its suppose to rain for the next couple of days can get started on fuse.
Rich

Rich, you are right on, it is the tank overflow. I glue the brass tubing down the inside of the engine box and extend it below the bottom of the fuse. The Tygon vent line from the tank makes a loop as it exits the tank, and then slips over the brass. The top of my engine box is screwed in place instead of being glued. This way I can get to the fuel lines without having to remove the entire engine and box. I can't remove the tank, but I can, if necessary, remove the tank plug and the inside lines and clunk. I am using a three-line setup (feed line with clunk, fill line with clunk, and vent line. The loop in the vent line helps prevent gas flowing out the vent line when the plane is inverted (not likely with this model!!!

) or when moving the plane around with fuel in the tank.

I still have to make a small block to fit between the overflow and firewall and screw it in place to prevent harmonic vibration.

I went to a local fun-fly today, weather was perfect. I flew the little plane I got the other day, flies great, lots of fun. I also flew my big Nosen Trainer which is an excellent practice plane for the BirdDog (almost the same size, similar flying characteristics) and I took the WACO, but was too chicken to fly it with the intermittent strong breeze that blew.

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