RE: 25% Cessna L-19/0-1 Bird Dog build  
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RE: 25% Cessna L-19/0-1 Bird Dog build - 2/14/2008 3:13:10 AM   
khodges


 

Posts: 5044
Joined: 7/3/2003
From: newton, NC, USA
Status: offline 		I did some "yank and bank" racing, too, but it was on two wheels, and no wings. Amateur roadracing back in the mid '80s, rode middleweight superbikes (600cc) and got to turn several laps at Road Atlanta on a Formula II once (250 Rotax). Made the 600 feel like a bicycle. Also got to hot lap my streetbike at Watkins Glen for a couple of hours one day (900cc Ninja). I raced the middleweights in the Endurance series, longest race was the 24 hrs at Nelson Ledges, Ohio. Quit riding in 1987, haven't been on a motorcycle since.

too tired to work in the shop today, long day at work.

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Club Saito #2, WACO Brotherhood #20. What other trouble can I get into?

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       Post #: 101

RE: 25% Cessna L-19/0-1 Bird Dog build - 2/14/2008 3:26:22 AM   
AIRPLANENUTS



Posts: 831
Joined: 7/21/2003
From: atlanta, GA, USA
Status: offline 		Hee Hee! No, the closest I've come to pylon racing is watching the Reno races on tv, Chic! Maybe that's where I heard the term!

Rick

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"Futaba gets it right the first time."

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       Post #: 102

RE: 25% Cessna L-19/0-1 Bird Dog build - 2/14/2008 5:15:29 AM   
khodges


 

Posts: 5044
Joined: 7/3/2003
From: newton, NC, USA
Status: offline 		Chic, (and other 'Dog builders), I'm in contact with Mike at Graph Tech about making a carbon fiber main gear for the plane, with closer-to-scale dimensions. I'll let you know what I find out. Hopefully he may have something close enough that it can be modified without having to lay one up special.

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Club Saito #2, WACO Brotherhood #20. What other trouble can I get into?

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       Post #: 103

RE: 25% Cessna L-19/0-1 Bird Dog build - 2/14/2008 11:36:46 AM   
redtail


 

Posts: 284
Joined: 10/14/2002
From: Alexandria, VA,
Status: offline 		Now laying over one of those race bikes is serious "Banking and Yanking". Love to watch it. Today, I worked on the two full 1/4 scale bodies, pilot and an Air America Observer (smile). They are painted and ready to be mounted by velcro on the seats as soon as I paint them. Time to go to work. Chic

(in reply to khodges)
       Post #: 104

RE: 25% Cessna L-19/0-1 Bird Dog build - 2/17/2008 2:48:52 AM   
khodges


 

Posts: 5044
Joined: 7/3/2003
From: newton, NC, USA
Status: offline 		Well, now that I decided on the engine and committed to it, I worked today on the engine mount box. The plans describe either a Quadra 35 or 42, and the parts for the box work perfectly for the G-45, no mods necessary. I have a B&B mount, it and the length of the G-45 put the prop hub in the perfect spot. I don't have my engine yet; I went to my LHS and measured a G-45 he had on the shelf. I sure would like to have bought it from him, but his supplier is more expensive than where I bought mine. The top of the box will be removable, so I can get to the fuel lines, even though the entire mount must be unbolted to remove or replace the tank. I also pinned the front plate of the box to the sides with some pieces of 3/32 carbon fiber rod; I drilled holes, smeared the rod pieces with epoxy, and drove them in flush. I could have used wood dowels, but didn't have any the size I needed.

I also made the rear window brace using 5/32 brass tubing and small pieces of flat stock, just as the front window brace is done. I guess I'll start sheeting the fuse next.

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_____________________________

Club Saito #2, WACO Brotherhood #20. What other trouble can I get into?

(in reply to redtail)
       Post #: 105

RE: 25% Cessna L-19/0-1 Bird Dog build - 2/19/2008 4:17:45 PM   
AIRPLANENUTS



Posts: 831
Joined: 7/21/2003
From: atlanta, GA, USA
Status: offline 		Ken, are you going to use the "v" Plastruct for your corrugations? Looks like it will take about 100'+-, and that's a lot of $4/bag Plastruct!

Rick

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"Futaba gets it right the first time."

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       Post #: 106

RE: 25% Cessna L-19/0-1 Bird Dog build - 2/20/2008 1:33:44 AM   
Rmerritte


 

Posts: 10
Joined: 11/14/2007
From: Sorrento, FL, USA
Status: offline 		Chic;
How did you set the washout from rib 7-15 and the dih of 3/16 inch when you build upside down? Bottom first wouls mean the 7th rib would be up 3/16 nd the 15 rib on the table?? Am I looking at this wrong? The wing is to have the washout plus another 3/16 dih from 7-15. Maybe I missed something! I appreciate your and Ken's input. I too ordered the hinges but haven't gotten them yet. Hang in there!

Randall

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       Post #: 107

RE: 25% Cessna L-19/0-1 Bird Dog build - 2/20/2008 1:38:54 AM   
redtail


 

Posts: 284
Joined: 10/14/2002
From: Alexandria, VA,
Status: offline 		Come on now, I told you guys to go on ebay and check for better prices or offers. Guess I got lucky when I bid on my packets of Plastruct. You certainly could use a triangle stock but be careful not to sand it away. Well, well, well, Ken, guess who I heard from today, and probably you did too. I know it was because of your provoking. Yes, I got an update email from Jerry himself. He sincerely apologized for the delay, OK, I appreciate that much. I agree with you with regards to other sources. Kind of puttsing around here in the workshop today, feeling like the flu is trying to get a grip on me and only worked on painting the seats and putting a piece of light ply across the seat to use in supporting the pilot and observer. I painted the seats a medium green and screwed the ply across the seat side rails and will then apply the green cloth material to form the seat. I will then cut an area out of the green cloth to gain access to the ply underneath where the pilot and observer's butt will be placed, I will now glue the velcro to that area and another piece to the butt of the pilot/observer. That way I can pull either the pilot/observer up and out of the cockpit whenever needed to be able to unscrew the cockpit floor for maintenance. My nose is running, I'm about to go for now. Chic

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       Post #: 108

RE: 25% Cessna L-19/0-1 Bird Dog build - 2/20/2008 1:46:20 AM   
redtail


 

Posts: 284
Joined: 10/14/2002
From: Alexandria, VA,
Status: offline 		Whooooooo, slow that muletrain down a bit. You do not build the wing upside down. At least I didn't. I lay saran wrap across my plans and build upright there on top of the plans. You build the dih and wash out right into the wing as it is laying there on your build table. If I remember correctly, Roy "V" has something on his website that will explain how to do the washout. I'm sooooo drugged up down, it would be ashame for me to tell you which rib to adjust and which rib to shim to get the washout. The dih is build in if I remember by simply placing the root rib at an angle. This way when you mount it to the fuse, the angle sets the dih for ya. Am I right Ken?????????? Thank goodness for PM Nightquil. Randall, where did it say to build the wing upside down. That needs correction ------------- or ------------------ is it the Nightquil talking. Nite nite guys. Chic

(in reply to redtail)
       Post #: 109

RE: 25% Cessna L-19/0-1 Bird Dog build - 2/20/2008 3:18:03 AM   
Rmerritte


 

Posts: 10
Joined: 11/14/2007
From: Sorrento, FL, USA
Status: offline 		Chic: I didn"t see it either(build upside down) just trying to reason this out. I built with tne wing up also but the shims to get the washout is showing on the pictures so I wondered how i was going to sheet the bottom and still have the washout. Sorry for the confusion.
I really hope you kick that cold or flu. I've been fighting it for 3 weeks! Get well soon!

Randall

(in reply to redtail)
       Post #: 110

RE: 25% Cessna L-19/0-1 Bird Dog build - 2/20/2008 4:24:15 AM   
khodges


 

Posts: 5044
Joined: 7/3/2003
From: newton, NC, USA
Status: offline 		I think I know what Randall is talking about re: the dihedral. The overall wing dihedral is constant from the root to the tip, and this angle is set by the root former rib. From rib #7 to the tip, the wing begins to thin in section from the top surface to the bottom surface; the top surface stays flat relative to the inboard section , so the underside has to "angle" upward, sort of a secondary dihedral. It isn't much, but the ribs have to be shimmed as you progress toward the tip to allow for this. I noticed this notation on the plans also, and had to think about what it meant. You can see a little of this secondary dihedral in the pic below. I think, if you planned it right, you might be able to build the wing upside down. You wouldn't have to shim the outer ribs for the dihedral, and to set the washout, the trailing edge ends outboard of #7 rib would be angled down instead of up. Take great care that the recommended 1.5 degrees is not exceeded, as the main wing incidence is only 2 degrees. This would give the tip area an incidence of only 0.5 degrees.

I haven't even thought about starting the wings yet, and also haven't planned how I propose to align the ribs to set this dihedral, as well as the washout, but I'm sure it will involve more T-pins than I now possess.

I started sheeting the tail boom yesterday, and worked on it some tonite. I shifted gears again; the plans call for 1/8" balsa, but I am using 3/32". This will hopefully offset the weight somewhat from whatever I wind up using for panels in this area, plus the fiberglassing. The 3/32 is a bit easier to bend around the curves also. I'll post pictures when I'm done, maybe by Fri. nite.

Don't be sneezing on your screen, Chic, I don't want to catch whatever crud you have Get better.

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_____________________________

Club Saito #2, WACO Brotherhood #20. What other trouble can I get into?

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       Post #: 111

RE: 25% Cessna L-19/0-1 Bird Dog build - 2/21/2008 2:24:54 AM   
khodges


 

Posts: 5044
Joined: 7/3/2003
From: newton, NC, USA
Status: offline 		My G-45 arrived today. Ordered it last Tuesday; one week and one day from Oregon to NC via the cheap route (Chief pays for ground freight on engines), not bad. Unfortunately, the Pitts muffler was backordered, don't know when it will come.

So, I have been playing with my new toy tonite and see that a couple of changes will have to be made. First, in order to use the longer throttle arm included with the engine, the choke arm must be reversed (to come out the top of the carb, and not interfere with the long throttle arm coming from the bottom of the carb. So, I unscrewed the choke plate from the shaft, and pushed the shaft out of the carb body. There are two narrow areas on the shaft; a small spring loaded ball in the carb body rides in this narrow area, and when the choke is in its open position, the ball drops into a detent in the narrow area, holding the choke open. When the shaft is reversed, the other narrow area does not have this detent. I took a Dremel tool with a 2mm diamond ball and ground a detent in the other groove, so the choke works the same way. Otherwise, engine vibration could potentially vibrate the choke shut while running. Reversing the choke won't create any serious linkage routing problems.

The other thing is something I noticed on Chic's BirdDog pics; his engine was rotated several degrees clockwise (cylinder leaning toward bottom right, about 6:30 or 7:00) I will have to do the same thing to give the spark plug enough clearance to clear the cowl. No big deal, only need about 1/4-1/2 inch. It means re-drilling the holes on the engine mount plate. the only thing I can see that may need tweaking after tilting the engine is where the exhaust pipes will exit. I think they would need modifying anyway to get them in the scale position at the bottom rear of the cowl. I'll take the muffler to a guy I know who can cut, bend, or weld whatever I need on the pipe tips to put them where they need to be. No big deal.......I hope.

Chic, how ya feelin'? Still full of NyQuil?

_____________________________

Club Saito #2, WACO Brotherhood #20. What other trouble can I get into?

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       Post #: 112

RE: 25% Cessna L-19/0-1 Bird Dog build - 2/21/2008 11:41:25 AM   
redtail


 

Posts: 284
Joined: 10/14/2002
From: Alexandria, VA,
Status: offline 		Well, here is the story. I come home from school, eat, and get into the bed with a full load of meds. So I am sort of still down for the count but by sleeping it off, I have been able to still teach 6th grade math every day. What would those darlings do without me ---------- right. Thanks guys for asking. I did get a peek at the seats before my wife directed me back into the house and into bed. I did decide to also add velcro to the backs of the pilot/observer for stability. Ken, glad you mentioned the choke assy. Will certainly make that a priority when I get back into the shop. Completely assumed it was not a problem. My muffler exhaust pipes peep out of the cowl in what I presumed to be the correct place. I think so. Thanks. Chic

(in reply to khodges)