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-   -   TopRc F4U Corsair assembly (https://www.rcuniverse.com/forum/rc-warbirds-warplanes-200/11676322-toprc-f4u-corsair-assembly.html)

BarracudaHockey 04-25-2020 08:12 AM

Can't wait to get some flight shots!

TimD. 04-26-2020 10:27 AM

OK,, back to earlier in the thread "Finishing".
Prior to the build I mentioned how I trace all panel lines and panels with a pencil. This is how I go from there.
https://cimg4.ibsrv.net/gimg/www.rcu...8e04dac78a.jpg
This is a basic paint kit which can be bought at WalMart or other local goods store. It cost about $8-10. I also have a can of Aluminum and Flat black. I prefer the oil type paint but suggest using Acrylics just for the ease of clean up. The reason I like oil is it will not deteriorate in the sun or over time. I cut up half of an old towel in 8"x8" squares.
https://cimg2.ibsrv.net/gimg/www.rcu...1421185113.jpg
Now the real question? What color is " Grime"? I use a blend of dark green, medium brown and white. This gives what I think it looks like.
https://cimg4.ibsrv.net/gimg/www.rcu...6c5ff784c1.jpg
I use a small piece of cloth rub into the paint then rub all over an area 8"x8" or so making sure to get it into all the grooves. Then take my wipe down rag quickly getting the majority back off.. Some of the paint stays in the cracks and gives a very good WORN look.
https://cimg5.ibsrv.net/gimg/www.rcu...e1207a3ea5.jpg
I use a small Acid brush to add an Aluminum worn look. If you get to much on NO WORRIES use your rag and remove it. Funny is, the more you screw up and fix the better it will look! Just keep working it over till your happy.
https://cimg4.ibsrv.net/gimg/www.rcu...df68a5242a.jpg
The Aluminum should be applied first then the Grime color. That way it over laps the bright Aluminum color and looks dirty. When you are at the field the sun will glisten on the charcoal from the pencil line and really stand up.

Will post more later

A scale model is never finished it just sits waiting till you have the time/patience to get back to it.

BarracudaHockey 04-26-2020 10:33 AM

Nice job!

I have a helicopter I'm dropping off for paint! :D

Fly2XS 05-02-2020 11:10 AM


Originally Posted by TimD. (Post 12592554)
The flap hatches are made of ply with finish coating "Strong". The Aileron hatches are made of the composite/foam core like the wing skins. I felt this to be a bit of a weak point so I added 1/64 ply to the inside of the hatch plates. This made them much much stiffer.
https://cimg6.ibsrv.net/gimg/www.rcu...967bb4677b.jpg
I also take a standard pencil and trace all panel lines and raised panels on each part as I work on them. This just helps the lines stand out a little better when out in the sun. There will be more DETAIL work towards the end. This is just the process of how I usually go.
https://cimg7.ibsrv.net/gimg/www.rcu...4d84675d32.jpg
Now hinging the center sections flaps were a bit challenging. Getting everything lined up to operate evenly took patience. ( this is something the Manuf may want to consider doing at factory). I've been modeling for 30yrs and the average newcomer may be baffled.


I received my Corsair in March and am stuck on hinging the in-board flaps.
i have not built a Top RC Model before and the instructions are weak at best!

Do you have some guidance?
Photos?

The instructions show a single horn on each aileron.

I would appreciatte any insight you can give!

Scott

TimD. 05-02-2020 02:34 PM

Honestly I did not look at their assembly manual, except when I first downloaded it. Like you say it really does not give much helpful advise. "VERY Generic"
I have built models for 35yrs or so, so I have a good bead on what to do.

On the ailerons it might show one horn. In the hardware pack, there were enough to do a double so I did. I just figured they forgot to route out the holes "LOL"

The inboard flaps - First get the hinges in the correct directions. Lay the center section upside down. Get the adjoining flaps in their correct locations. Look at the hinges and put in place, you will see they will only work out in one direction.
Now once that is figured out. Get your epoxy ready - drop down in the holes, insert the hinge, check and make sure it is getting full coverage on the hinge. Now move the inner flap to its correct place mating up with the center sections top surface. Add the outer wing panel to that side and wiggle everything so it mates up with the center section top and aileron that is how you line them up. Once you have in the proper locations put some tape on the flaps and center section holding them in that location. Having the hinges themselves flush with the surfaces plays a role here so pay attention to that. I stood my center section on the leading edge to let dry.

Let me know if you have any other questions. I will get a pic for you tonight.

Fly2XS 05-03-2020 06:34 AM

I m not sure if my last response was posted so I'll try again.

1. What extensions did you use? I need to stock up.
2. I wanted to fly in May so I bought the TopRC gear instead of waiting for Robarts new gear. How did you fit yours?
3. My left wing pins do not match with the center section with the spar installed.

thanks!

Scott

Fly2XS 05-03-2020 06:37 AM

https://cimg2.ibsrv.net/gimg/www.rcu...2405582306.jpg
Just out of the box
https://cimg3.ibsrv.net/gimg/www.rcu...31e4dffba9.jpg
Happy to have it!

Fly2XS 05-03-2020 06:41 AM

https://cimg5.ibsrv.net/gimg/www.rcu...db711bf6f.jpeg
Now to figure out how to work the hinges?
https://cimg4.ibsrv.net/gimg/www.rcu...d4b2c725a.jpeg
How the manual shows the connections

Fly2XS 05-03-2020 10:49 AM

Tim,
I was planning to use (4) analog 645s on the flaps but the center section mounting and outer wing mounting are reversed.
the only way to work it without changing the servo mounting is to put each servo on an individual channel, or change to digital servos and reverse program half the servos.

What did you do?

Scott

TimD. 05-03-2020 11:30 AM


Originally Posted by Fly2XS (Post 12601720)
Tim,
I was planning to use (4) analog 645s on the flaps but the center section mounting and outer wing mounting are reversed.
the only way to work it without changing the servo mounting is to put each servo on an individual channel, or change to digital servos and reverse program half the servos.

What did you do?

Scott

It will work. I used the 645mg's on all of the flap and ailerons. The outboard flaps on one side will mate up with the inner flap on the opposite side. I used a Y harness to couple them and vise versa for the other. Equaling two flap servo connections exiting the wing. I have those on separate channels.

https://cimg6.ibsrv.net/gimg/www.rcu...8e43d83a13.png


TimD. 05-03-2020 11:33 AM

After doing another count I believe there are 19) servo extensions and 2) Y-harness. I make my own extensions per plane. They are custom cut to proper lengths.

I have the Top RC gear also. They seem to work well so far but I do not have any flight time on them yet.

The wing spar has to be in the center section first, otherwise the anti rotation pins will hit high on the center section.

TimD. 05-17-2020 05:40 AM

Anyone putting this plane together , just a FYI it will need approx. 12-13lbs of engine weight. So pick your engine accordingly. I recommend a 120-180cc radial you will need the weight and in my opinion you can always throttle back instead of 5-6lbs of lead.

Mine is at 44lbs take off weight.

Fly2XS 05-17-2020 11:39 AM

Hey Tim,
Would you be open to sharing your build experiences?
The hinging of the flap is a bit screwy being so far below the trailing edge (as compared to the full size).
i used your suggestions to set the flaps in place while the wing is on its leading edge. Then I could epoxy the hinges in place.
I'm finding a lot of binding between the inner flap and the center flap due to the spade joiner.
did you run across this and what do you suggest to reduce the friction?

Thanks!

https://cimg3.ibsrv.net/gimg/www.rcu...39d12fa4b5.jpg

TimD. 05-17-2020 04:41 PM

Mine would rub at the middle flap and outer flap where the wing joins. Its like the jigs at the factory were off a 1/16th upon drilling the hinge holes. I took a piece of sand paper and a piece of 1/4" plywood 1"x12" slowly sanding off a bit to get them to work correctly. After sanding them to fit , I then used some touch up paint to cover the ends.

I just finished the sliding canopy on mine last night. The 1/4 pilot did not work to Big. I ordered the 1/5th and it is a perfect fit.

If you have questions just ask.
I have built many many many many planes over the years and this one took more than the average. When finished it is Nice!

Fly2XS 05-18-2020 05:03 AM


Originally Posted by TimD. (Post 12605112)
Mine would rub at the middle flap and outer flap where the wing joins. Its like the jigs at the factory were off a 1/16th upon drilling the hinge holes. I took a piece of sand paper and a piece of 1/4" plywood 1"x12" slowly sanding off a bit to get them to work correctly. After sanding them to fit , I then used some touch up paint to cover the ends.

I just finished the sliding canopy on mine last night. The 1/4 pilot did not work to Big. I ordered the 1/5th and it is a perfect fit.

If you have questions just ask.
I have built many many many many planes over the years and this one took more than the average. When finished it is Nice!

Tim,
What engine are you flying in this air frame?
Can you post some images of your gear door servo & linkage set-up?
Thank you!
Scott

HiCurrent 05-18-2020 12:06 PM

TimD, looking forward for a flight report. Thank you for created this thread.

Fly2XS 05-19-2020 06:54 AM


Originally Posted by TimD. (Post 12605112)
. . . "I just finished the sliding canopy on mine last night. ." . .

TimD,
Thats really cool! What is your configuration for the sliding canopy? Are you using a linear servo?

Scott

Fly2XS 05-19-2020 07:21 AM

https://cimg7.ibsrv.net/gimg/www.rcu...2bf00e6bc.jpeg
Now looking to set up the gear doors with sequencing servos. I see the hardware in the manual photos for mounting the servos is not in the hardware bags.

Fly2XS 05-19-2020 07:52 AM

https://cimg4.ibsrv.net/gimg/www.rcu...954b0f419a.png

TimD. 05-20-2020 02:46 PM

I have the UMS 7yylinder 90cc radial in mine. I have a couple of bigger radials if I need to change it up. I added 2lbs of lead on standoffs as far forward as I could get it. I mounted an APS fuel pump to the inside of the firewall along with the batteries. Trying to keep the excess weight as far forward as possible so I would need less ballast. I will get a couple of pics of that next.

I use Hitec servos so here is what I came up with. Using the double arm , I cut one side off leaving one hole available. That hole goes to the short control rod. On the other side I went to the second hole out and connected the longer rod to it.
https://cimg8.ibsrv.net/gimg/www.rcu...fcb3c0a8cd.jpg
https://cimg0.ibsrv.net/gimg/www.rcu...ac440ac3d0.jpg
https://cimg4.ibsrv.net/gimg/www.rcu...826f0b2cc9.jpg

Fly2XS 05-20-2020 03:21 PM

Thanks Tim!
it looks like you had more of the aluminum L mounts for the door servos.
i have kit #49 and it only had enough mounting hardware for the aileron and flap servos.
looks like I’ll have to make my own brackets.

What did you do for the canopy?

Scott

TimD. 05-20-2020 05:29 PM

Mine did not come with them. I guess they figured we would come up with some or they did not calculate the hardware pack correctly. I made mine from 3/4" aluminum L-Stock. I cut 1/4" pieces. I bought the metal from Home depot years ago just for this purpose. Bob Violet made them out of a resin fiber for his models, that's where the concept came from. This is pretty much the same thing just a bit more work on our end.

TimD. 05-24-2020 03:28 PM

Ok, after my final attempt at Balancing . I added another 20oz to the front totaling 4 1/4lbs of dead weight lead and it still needs more. I am speculating another 4lbs or so.
I plan to do an engine change and install a Moki 180 it needs the weight period!

I do like the plane and feel it is in comparison to the CARF at half the price.
















Fly2XS 05-26-2020 06:50 AM

TimD,
You have some great looking nomenclature added to your Corsair. Did you print it yourself, or did you find it from another supplier.
Scott

Steve oh 82 06-04-2020 02:23 PM

Hello,

Nice build thread!

I am currently assembling this plane with a Saito 90r3. Do you have any photos of how you attached the tail wheel steering? I can't seem to find any photos of how others have it set up.

Thanks,


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