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RE: Great Planes Combat Corsair and Mustang - 11/21/2007 8:09:50 PM   
root



Posts: 460
Joined: 11/20/2004
From: Manasquan, NJ, USA
Status: offline 		Hey vert,

Are you familiar with the exact procedure to strengthen the horiz. stab of the Corsair w/ carbon strip from tip to tip w/out disturbing the fuselage?

Can u read any of my previous unanswered questions from the last post as well?

THANKS, much APPRECIATED!

root aka Bob G

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RE: Great Planes Combat Corsair and Mustang - 11/21/2007 8:36:52 PM   
root



Posts: 460
Joined: 11/20/2004
From: Manasquan, NJ, USA
Status: offline 		Hey nexxa,

how did you do this carbon fiber support?

what thickness did you use?

Is it one strip thru one side and out the other?

How did you attach it to the tip?

epoxy carbon to balsa??

Is there a less visible way?

??

root aka Bob G



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< Message edited by root -- 11/21/2007 8:45:37 PM >

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"I should have zigged instead of zagged"

(in reply to nexxa)
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RE: Great Planes Combat Corsair and Mustang - 11/21/2007 11:19:57 PM   
root



Posts: 460
Joined: 11/20/2004
From: Manasquan, NJ, USA
Status: offline 		Hey borisp, can you help to answer these questions?



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"I should have zigged instead of zagged"

(in reply to borisp)
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RE: Great Planes Combat Corsair and Mustang - 11/22/2007 12:36:02 PM   
root



Posts: 460
Joined: 11/20/2004
From: Manasquan, NJ, USA
Status: offline 		Happy Thanksgiving Everybody...and THANKS for helping a fellow member........shhheeeeeeeeesh!

root aka Bob G

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"I should have zigged instead of zagged"

(in reply to root)
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RE: Great Planes Combat Corsair and Mustang - 11/22/2007 1:41:00 PM   
nexxa


 

Posts: 133
Joined: 11/19/2004
From: Montreal, QC, CANADA
Status: offline 		Hi "Root", you’re lucky! I was spending some time one the forum and I saw your post! If you want a quick answer, post your questions and send an email. I will be advice! I spend a lot of time in Speed Planes forum
Excuse my English! I’m French!

I buy 3 of these small combat planes. 2 Mustang and 1 Corsair. I almost lost my first Mustang due to elevator failure. I decide to beef it up by adding a carbon rod in the elevator and laminated it with a 3/32 balsa sheet. It was very strong after.

The second mustang I just remove the covering under the elevator before gluing it to the plane and add a layer of glass fiber with zpoxy. Little sanding, put back the covering and install it. Very strong, but finally after many high speed pass, the control horn failed. No more elevators. Total lost.

The Corsair, I try another method. Very light, strong, easy to install.
I used 1/8 carbon rod (full, no hole in center.) I drill for each side of the fuselage a hole and same in the elevator. But when drilling the elevator I don’t pass through. Put some thin CA in the hole to reinforce the wood. Put some Epoxy 30 min and the rod. That's it.
I will try to find some better pictures. Stay tune!




(in reply to root)
       Post #: 505

RE: Great Planes Combat Corsair and Mustang - 11/22/2007 2:01:34 PM   
nexxa


 

Posts: 133
Joined: 11/19/2004
From: Montreal, QC, CANADA
Status: offline 		I'm a real artist!

Look the attach picture.
Rear view of the Corsair with the elevator on.

The ± green color is the balsa, black color carbon rod, gray color epoxy. It`s how I glue my carbon rod in place.
Very strong or strong enough!! I put this setup on real test with high altitude speed dive.

Don`t worry, it will stand the load, but reinforce the wood where the control horn is attach. The control horn will come off or will become very fragile.

Hope this help.




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(in reply to nexxa)
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RE: Great Planes Combat Corsair and Mustang - 11/22/2007 4:47:25 PM   
root



Posts: 460
Joined: 11/20/2004
From: Manasquan, NJ, USA
Status: offline 		Thanks,

It looks like you used a flat piece of carbon - not a rod. Yes? ************SEE attached photo***********

But how and why do you reinforce the control horn?

Is there that much stress that it goes thru?

How do you do this?

Can I glue 2 control hinges to the top and bottom as a plate-like surface as the Diamond Dust plans suggest or should I use two 1/16th plywood plates CA'd to the balsa top and bottom? ************SEE attached photo***********

One more question......Is a rudder worth the added wieght of the servo and rod??

I'll be using a 25FX w/a APC 9x5 or 6 prop on 18/23 fuel.

root

ps Happy Thanksgiving to you and yours. I am thankful you responded to my posts.


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< Message edited by root -- 11/22/2007 6:07:53 PM >

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RE: Great Planes Combat Corsair and Mustang - 11/22/2007 6:32:05 PM   
nexxa


 

Posts: 133
Joined: 11/19/2004
From: Montreal, QC, CANADA
Status: offline 		No, it's not a flat piece of carbon. It's a Rod 1/8" (round). I install these 2 rods to add stiffness to the stab. When it’s done, no worry to break in half the elevator if you’re pulling the elevator to the max in a big dive. It will stand the force. But if you reinforce the stab, it will break at another weak point. Yes you can laminate both side of elevator and screw your control horn on it. Just remove the covering, place your CA hinge and put thin CA. Like the Diamond dust. Me I use 1/16 plywood both side, maybe 1 1/2" by 3/4".
All these mods are not required if you fly your corsair gently, with a .15 or .25. Mine was equipped first with an OS.25, in second with an OS.32SX with full tune pipe. Always full throttle, always pulling hard on the elevator for High G turn, high speed pass.... a lot of stress. Mine broke in half after only three flights, and the engine was still in broke in process!
The second one, the control horn was still screw to the elevator section, but this section was no more part of the elevator!!! The elevator fails where the control horn was screw.
For the rudder on the corsair, there are no worries about the weight if you're using a micro servo. Use the extra rod provide in the kit. The Corsair is light and the wing loading is low. The extra weigh will not affect its flight characteristic. On mine, I put front and rear wheels. Maybe ± 8 oz of extra weight. With the OS.25 it take off in only 20 feet (APC 10X3 or 10X4) and the landing was very easy.
If you have the patience to do the mod, go for it. On landing, with a small crosswind, the rudder is very helpful. Are just to put the plane on a small knife edge when making a low pass, it worth the work!

I will check tonigh if I could find some pictures...






(in reply to root)
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RE: Great Planes Combat Corsair and Mustang - 11/22/2007 8:51:11 PM   
borisp


 

Posts: 65
Joined: 5/31/2005
From: Zagreb, CROATIA (HRVATSKA)
Status: offline
quote:

ORIGINAL: root

Hey borisp, can you help to answer these questions?




Hi root,

Really sorry I haven't replied any sooner, but I have never modified my Corsair in any way so I can't help you with that. Still I'll try to answer on some of your questions:

I don't think rudder is a necessary mod.
Hammerheads can be done without rudder, but it's not so much the question of doing it with ailerons, it's more throttle management and stopping her in vertical but slightly leaned on either wing.
Cross wind situations? You don't need rudder for that. You will see you can fly her sideways just with ailerons
Also flaperons not needed.

In one word she's a great plane out of the box, just one thing: watch your speed on dives and if you don't go over .25 motor you'll be safe, otherwise some reinforcement could be necessary.

Again, sorry for not being able to help you more regarding reinforcement issues.

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Boris

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RE: Great Planes Combat Corsair and Mustang - 11/22/2007 8:57:27 PM   
borisp


 

Posts: 65
Joined: 5/31/2005
From: Zagreb, CROATIA (HRVATSKA)
Status: offline 		Just to avoid missunderstandings, nothing against rudder control it's a very nice addon specially on the wheels, just saying it's not neccesary.

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Boris

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RE: Great Planes Combat Corsair and Mustang - 11/22/2007 9:22:08 PM   
borisp


 

Posts: 65
Joined: 5/31/2005
From: Zagreb, CROATIA (HRVATSKA)
Status: offline
quote:

ORIGINAL: borisp

Well, I did it!!! I launched her inverted, and it's definitely a way to go (at least for me).

Instead of a flight report, a friend of mine had a camera, and was so kind to place on his web site a short video clip (less than 300 Kb) of a first launch attempt. So please take look at:

http://www.flightmadness.com/video/corsair.avi


Some important details you cannot see from the clip:

- Elevator down trim was about 30-40 % of a full recommended down throw. It was a bit over trimmed, 25 - 30% (2 - 3 mm) would be just enough, I guess.
- Throttle was at 50 - 70 % of a full throttle (OS-25 FX + APC 9x6).

And a bit of advice: if you have at least minimum positive rate of climb, just concentrate on ailerons and don't touch elevator or throttle commands until you reach a safe altitude. Of course, if she sinks or it is extremely over trimmed you'll have to correct it, but do it very gently.

I would also recommend practice of inverted flight before trying an inverted launch. The day before I took my electric powered Corsair (from Alfa Models) and made 6 successful inverted launches with that one, just for a practice.




Just realized the above link to the video is broken. No wonder, it was more than two years ago . Since it's so interesting and very short - here it is again ...

http://rcuvideos.com/item/6MJ3H09L6QWJBDSZ

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Boris

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RE: Great Planes Combat Corsair and Mustang - 11/23/2007 3:00:24 AM   
root



Posts: 460
Joined: 11/20/2004
From: Manasquan, NJ, USA
Status: offline 		Thanks,

My flying buddies all say that I read too much in these forums and I guess I needed to hear from experienced Combat Corsair / 25FX owners, such as yourself, whether or not the mods are a necessity.

I'm sort of in a hurry to find out ASAP 'cause the planes arriving t'morow and it's my 55th birthday, the wind is gonna be rippin' at 15 to 20 so.........what better day would there be to start building this little beauty?

Plus, I'm always looking for less to hassle with. As it is now, it'll probably take me twice as long as anyone else. I'm a better pilot than I am a builder...even if it is just an ARF.

Can I install the rudder after I glue the Stab in or is that gonna make it too much of a PITA?

Anybody else out there who has the 25 sized motor want to chime in and make a comment about leaving the plane "as is"?

root aka Bob G

ps ---my bud Ed says to keep it lite, why add the weight?

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RE: Great Planes Combat Corsair and Mustang - 11/23/2007 4:58:12 AM   
borisp


 

Posts: 65
Joined: 5/31/2005
From: Zagreb, CROATIA (HRVATSKA)
Status: offline 		Well then, happy birthday Bob !!!

I would say you should not have any serious problem installing rudder afterwards, if you decide to do so.

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Boris