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RE: GROUP BUILD - Top Flite Giant Scale F4U Corsair - 10/27/2005 10:53 AM   
D Bronk



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From: Wpg, MB, CANADA
Status: offline 		Main thing is your happy how it turned out..Those LEDs. are pretty nifty, for such a tiny thing.I got some here, that are the size of a pin head, you should see the light they put out..going to use those, for gauge lights,and warning lamps on the dash panel...should be very, COOL MAN!!!!!

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RE: GROUP BUILD - Top Flite Giant Scale F4U Corsair - 10/28/2005 4:33 AM   
wulf190



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Status: offline 		Worked on laying down the glass for the tailwheel and gear doors today. Does anyone have a template for the tailwheel door outline? I can try blowing up my line drawing, but I don't have it handy, and it would be tough to get it to the right size on my junky copy machine.

Anyone have this in an email compatible file I can print out? Sure would make cutting out the tail doors easier. They seem to have a pretty unique shape to them. I think I'm going either direct connection or the compression spring loaded wood plate connected to the doors. Looks like Dion's got the connection right though.

Thanks in advance.
Mike

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RE: GROUP BUILD - Top Flite Giant Scale F4U Corsair - 10/28/2005 8:52 PM   
wulf190



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Status: offline 		Not going to get too detailed on the doors as the tailwheel hook seems like a little too much work, so I just cut the doors a little longer than was necessary rather than run them all the way back. Got a nice curve to match well with the fuse on the doors, using 4 layers of heavy cloth and Smith systems finishing epoxy, then shaping with a coat of Evercoat. I left the front open for now.

I wanted to have access to the tail wheel mount screws without the doors interfering with my access in any way, so I'll mount a thin piece of plastic over the hole to cover it. Should fair in pretty well and get everything closed up on the bottom.

Now to hinge the doors and put the tailwheel in. I got this really nice retractable tailwheel on ebay for a great price and mount dimensions are same as the 160WC. It has a beefier air cylinder on it and is a bit heavier duty than the Robart one. Problem is the cylinder is TOO LONG . I would either have to make a hole for it in the forward former, or just get the 160 and have it drop in. I can't really get access to the former to make a clean interior cut , so now it looks like the 160WC!! Great another hundred bucks.



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RE: GROUP BUILD - Top Flite Giant Scale F4U Corsair - 10/28/2005 8:57 PM   
wulf190



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Status: offline 		For the wing doors, I also decided to use glass, same method. I bought the plane framed up and the cutouts were already made for the gear and wheels, so I have to fill in to shape a little with Evercoat, but it doesn't seem like it will be a problem. I'm using Nelson hinges on all of the doors.


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RE: GROUP BUILD - Top Flite Giant Scale F4U Corsair - 10/29/2005 2:17 AM   
rt3232


 

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Hi if you are going to put barn doors on I would sugest to make sure that you have a minimum of 1/4 clearence on the sides of the wheels, you can get by with less but it makes it harder to get the open/close system just right..

Bob T

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RE: GROUP BUILD - Top Flite Giant Scale F4U Corsair - 10/29/2005 2:54 AM   
wulf190



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Status: offline 		Bob, I'm thinking about using air cylinders for the doors as the Aerotech wheels I'm planning on using are 4 7/8" which will make things tight. It would also be a little easier to hook them up and get the travel right. I think I remember someone saying that 1/2" travel cylinders will do it. I'll have to see what Bimba or UPC, or Yellow has to offer. I just don't see myself not getting frustrated when setting up the travel and geometry on the spring setup, especially with larger wheels in there.

Mike

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RE: GROUP BUILD - Top Flite Giant Scale F4U Corsair - 10/29/2005 2:55 AM   
rt3232


 

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Status: online 		Hi guys

Well I finaly got my l/gear doors working slick, even this old dog has learned a coupla of new tricks

I have to say thanks to Dion aka Luke and Dave Bronk, for shareing there ideas and systems with us, they made easy enough even for this frist timer to get it right.

When I started this door project I did not have a plan view of them or any dwg's So I laid out what looked right to me on the T/F plans, so the scale is off and the shapes are a little off but for a fon scale they will do for me.


hear is pic's of the right side..

have to try later server is down

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RE: GROUP BUILD - Top Flite Giant Scale F4U Corsair - 10/29/2005 4:15 AM   
rt3232


 

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Status: online 		Hi Mike

We have another club about 10 miles away, they are big enough that they have a group that just flys war birds, and befor I did my frist build, I ask what was the biggest head ache to the man the ansure was gear doors, there advice was avoid them if you can and use the simpelist system you can.

After looking at several systems air and mechinacal thats why I chose Dion's But the maine thing is to do what you feel comfortable with..

Bob T

hear are my pic's

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RE: GROUP BUILD - Top Flite Giant Scale F4U Corsair - 10/29/2005 4:51 AM   
D Bronk



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Status: offline 		That, really, looks,, good Bob...Right on,MAN...IT looks like .I just might be chopping up my wing, a bit ,yet

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RE: GROUP BUILD - Top Flite Giant Scale F4U Corsair - 10/29/2005 5:52 AM   
Rocketman612



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Status: offline 		Bob T,

Nice job!!

Pete

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RE: GROUP BUILD - Top Flite Giant Scale F4U Corsair - 10/29/2005 5:25 PM   
wulf190



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Status: offline 		Bob, your setup looks great. Nice job on the doors. Not having another air thing to worry about is good and it's the one feature that pulls me to the mechanical linkage.

I got the tailwheel to work, fitting my little Black and Decker remote tool into the fuse with the grinder and then sander to it before I burnt up the spring in it getting a clearance hole in the former in front of the air cylinder. But at least I was able to get the hole big enough on the inside to get a half round file on it before it broke. Now just the hookup.



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RE: GROUP BUILD - Top Flite Giant Scale F4U Corsair - 10/29/2005 8:04 PM   
rt3232


 

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That set up looks great to me, I have not gotten to that stage as yet so I real don't no what I will do. Are you using plastic fittings in your air lines ??? how did you sequence the doors??, Right now I am trying to decide what I want to do about the under side of the wing at the tip to get it to be alittle more scale like as the out board rib is to deep to get the correct tapper, what ever I do I will try to post pic's, if I think it will help some one..

Bob T

PS About little tools its to bad we can't find a sorce for retired dental air tools seems to me some of it would be usable. Oh well

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RE: GROUP BUILD - Top Flite Giant Scale F4U Corsair - 10/29/2005 9:02 PM   
D Bronk



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Status: offline 		I think the inner cables/driver is the same as a speedometer cable/driver from a car, truck,or motorcycle not the new stuff though they`re sensor driven and read by wire

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RE: GROUP BUILD - Top Flite Giant Scale F4U Corsair - 10/29/2005 9:16 PM   
wulf190



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Status: offline 		Dave, Thanks! I'll see what I can do about the cable. It worked real well within the limits of it's use, the first time I ever needed to use the remote tool.

I'm not sure about the tail door actuation yet. If I do air cylinders on the wing, I'll get some for back there too and get a sequencing valve for the doors and gear. If I settle on mechanical, I'll do a spring loaded compression plate like Todd Burley's P40 build thread shows or a hard connect like Dave shows. I'll have to think about it while I do some other stuff and see what I settle on.

There is enough room for a mico servo or two to operate them, which could be slaved to the retract channel to operate the tail doors as well. Can't imagine the weight would be too much problem with the micro servo.

< Message edited by wulf190 -- 10/29/2005 9:19 PM >

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RE: GROUP BUILD - Top Flite Giant Scale F4U Corsair - 10/30/2005 8:48 PM   
rt3232


 

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Status: online 		Pete,Dave, Mike, or any one with frist hand knowlage..

I have a "Stans" cowl and the cowl flaps are particaly open, I finaly got enough done on the fuse to put the cowl up to it, THE PROBLEM it looks like I will not get enough cooling with the flaps as set. Can they be cut and opened?? If so how?? just saw and bend, how do you suport?? I will have the dummy radial up front with the same cutout as I had on my frist build, and I only needed cowl flaps from 3 o'clock to 9 to get the cooling needed.. also what is the correct angle for fully open flaps??


Bob T

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RE: GROUP BUILD - Top Flite Giant Scale F4U Corsair - 10/31/2005 12:39 AM   
onewing



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Status: offline 		We just test flew my recently completed TF GS Corsair yesterday. Everything went well. This airplane was designed to be easy to build and fly, and that is exactly our experience.

The maiden flight was conducted by our club president, who was a A26 Invader pilot during the Korea War. After the maiden flight, I flew the airplane with him coaching me on the side. I also had a perfect landing. After landing. I felt the time and money spent over the last 8 months is well worth it.

It has a 3W75iUS engine with a 24X10 propeller, Robart main gear and tail wheel, operational gear doors controlled by a electronic sequencer, Futaba and Hitec high torque metal gear servos, full cockpit and full-figure pilot. The flaps were constructed per instruction. Glassed and painted. Final weight is 30.5 pounds, including 2.5 pounds of weigt in the nose.

I want this airplane to be my weekend flier. So, I did not spend too much time painting or adding scale features.

As I use a powerful engine, I enforced the structure quite a bit. I also received a lot of information and help on RC Universe during the construction phase of this project, including an article by Chris Spangenberg published on the Spring 2001 issue of High Flight magazine.

It only has 3 flights so far. So, I really can not say too much about its flight characteristics. But based on our experience so far, I can at least say it is easier to land than my TF 60 sized P40. It behaves quite well in the air, no bad habits. I have been flying my TF P40 for two years. So, I am not totally new to heavy wing loading (or wing volume) warbirds.

I would be glad to share my experience with you here.




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< Message edited by onewing -- 10/31/2005 12:42 AM >

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RE: GROUP BUILD - Top Flite Giant Scale F4U Corsair - 10/31/2005 12:54 AM   
rt3232


 

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Bob T

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RE: GROUP BUILD - Top Flite Giant Scale F4U Corsair - 10/31/2005 2:49 AM   
wulf190



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Status: offline 		OneWing, Looks great. That's very reassuring to hear. Glad you're speaking up, Bob and I have been carrying the thread for a while

Bob, I'm using the Fiberglass Specialties cowl. There's a pic of it early in the thread. I just cut out the plywood radial ring from the plan template just as it was where only the area in front of the engine is cut out. The bottom of the rear cowl will have to have a vent hole as I see it. I think Sagacity shows how it looks on his plane somewhere on the site somewhere, or OneWing, if you've got a shot of the engine area with the cowl on, send it our way.

Looks like for around twenty bucks I can get two microservos for the tail doors that will weigh only about a half an ounce for the two of them which is acceptable, so I may save some engineering work and use those back there if they'll fit. It'll for sure save an hour or two getting the linkage hooked up, and I can adjust the travel on the doors through the TX to keep it from binding. I may have to get one of those electronic sequencers unless I can remember to open the doors before slamming the gear down.

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RE: GROUP BUILD - Top Flite Giant Scale F4U Corsair - 10/31/2005 3:17 AM   
Rocketman612



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quote:

ORIGINAL: rt3232

Pete,Dave, Mike, or any one with frist hand knowlage..

I have a "Stans" cowl and the cowl flaps are particaly open, I finaly got enough done on the fuse to put the cowl up to it, THE PROBLEM it looks like I will not get enough cooling with the flaps as set. Can they be cut and opened?? If so how?? just saw and bend, how do you suport?? I will have the dummy radial up front with the same cutout as I had on my frist build, and I only needed cowl flaps from 3 o'clock to 9 to get the cooling needed.. also what is the correct angle for fully open flaps??


Bob T


Bob,

I used the ABS plactic cowl for my 60 size Corsair and was able to cut and open the flaps using a covering iron. I do not think you can do the same with the fiberglass. You will need to open up the bottom of the cowl to vent.


Pete

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RE: GROUP BUILD - Top Flite Giant Scale F4U Corsair - 10/31/2005 3:55 AM   
joey_snaproll


 

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Status: offline 		wulf 190,with you tail wheel, you can use the same set up that has been talked about and shown on a few corsair threads ,If you look at the royal corsair 60 proget thread , page two you will see it,there is other pictures in the many thread but I just can't find them right know.I hope this helps.This is the way I'm doing my when I build my big corsair.Plus will be using many of the ideas from this and all of the corsair threads.I know this set up was used in some mustang building threads too.


< Message edited by joey_snaproll -- 10/31/2005 3:56 AM >

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RE: GROUP BUILD - Top Flite Giant Scale F4U Corsair - 10/31/2005 6:30 AM   
ctflyboy


 

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Status: online 		Onewing,
Very nice looking bird glad to read it went well.

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RE: GROUP BUILD - Top Flite Giant Scale F4U Corsair - 10/31/2005 7:11 AM   
onewing



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Status: offline 		Guys, thanks for the kind words. Here are some more details:

Aileron servos: Futaba 9451 x 2
Flap servos: Hitec 645 MG x 2
Elevator servos: Futaba 3305 x 2
Rudder servo: Futaba 3305
Gear doors: Futaba 3004 x 2
Throttle: JR DS811
Retract valve servo: Expert SL451 mini

1 JR 2400 mah NiCd battery for receiver and servors
1 JR 1400 mah NiCd battery for electronic ignition
2 JR heavy duty charge switches
1 Futaba 127DF FX receiver

Jomar electronic gear and door sequencer

3W75iUS engine

True turn prop hub

Zinger 24x10 wood propeller

The gear doors are my own design. I just use two standard servos to keep it simple and reliable. Yes, it may be a little heavier than a mechanical system. But probably not too bad for a 25 to 30 lb airplane.

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< Message edited by onewing -- 10/31/2005 7:15 AM >

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RE: GROUP BUILD - Top Flite Giant Scale F4U Corsair - 10/31/2005 4:13 PM   
wulf190



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Status: offline 		OneWing,

Great, thanks for the pics of the door area. This is just the kind of setup I was thinking about, and if you can do it with standard sized servos, then I'm going with the skinny micros to put in there. With 3 of them (2 for the main, for the tail, I'm only adding about an ounce. There's still no better way than adjusting travel through the computer TX.

Mike

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RE: GROUP BUILD - Top Flite Giant Scale F4U Corsair - 10/31/2005 5:01 PM   
onewing



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A Jomar gear / door sequencer plus 3 mini / micro servo is really very light. It is quite easy to have this servo + bellcrank operated gear door system working consistently. There are two things I would like to remind you.

1. Make sure the mini/micro servo you use has adequate torque to hold the doors in flight.

2. I was not able to adjust the servo travel once the servos are connected to Jomar sequencer. So, both the retract valve servo and the gear doors servos are operated on full travel. I just mechanically adjusted the set up so they open / close doors properly. I think there are some electronics out there you can use to adjust the servo travels. But it beats my purpose of keeping it simple.

3. Like you said, if you can remember to open and close doors, then you don't need to mess with the sequencer, making your system even more reliable.

Onewing

< Message edited by onewing -- 10/31/2005 6:28 PM >

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RE: GROUP BUILD - Top Flite Giant Scale F4U Corsair - 10/31/2005 8:02 PM   
onewing



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Status: offline 		Forgot to mention two more things:

1. CG: On his thread posted on 12/30/2002, f4you suggested move the CG 1/2" ahead of the forwardmost recommended position. I did that, and the plane flies very smoothly.

2. Robart 148 rotating landing gear holds up pretty well. Much better than the 60 sized 615.

Onewing


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