sg26565

Hi,

Has anyone already purchased the new Corsair from TopRC? Mine arrived last week, but unfortunately, there is no manual available yet. Therefore, I would like to ask if someone already figured out the correct center of gravity?

Best Regards,
Oliver

spitfire66

Clue us in man! Where did you order from? Initial thoughts? Any pics?

sg26565

Over here in Europe, you can get it from bigplanes.nl or engelmt.de. However, both ship it without a manual.

I would love to share some photos. However, vBulletin tells me "You are not allowed to post URLs until you have at least 10 posts". So I have to do eight more posts before I can show something. bigplanes.nl has some nice photos.

Best Regards
Oliver

BarracudaHockey

My Feedback: (11)

Looks nice, this one is on my list.

Craig B.

I received this message from the Australian dealer...

The C.G for the Corsair is 155mm from the leading edge at the mid wing root.

TimD.

My Feedback: (207)

Had my eye on this one as well. I have a brand new UMS 7cylinder 90cc ready to go. Have been putting another Zero together but may hold off a bit now that I know they are being released.

sg26565

Thanks, Craig,

That sounds reasonable. My old Hangar 9 Corsair had 120 - 135 mm (4.5 - 5.3 in) with a wingspan of only 2.17 m (85.5 in). I was hoping for more since the TopRC Corsair seems to be very tail heavy. I am planning to mount a Moki S180 on it and it looks like I need to add additional nose weight even with this heavy engine. The natural fit is a Saito FG-90 or the UMS 7-90 mentioned above. However, those engines will require even more nose weight. The UMS 9-115 or the UMS 5-125 could also fit under the cowl.

Best Regards,
Oliver

sg26565

Today, I received the manual for the TopRC Corsair and the CG is indeed 155 mm from the leading edge of the wing root.

Thanks,
Oliver

tevans55

Do you have a diameter on the cowl yet?

sg26565

The cowl is 270 mm heigh and 265 mm wide at the fuselage. To the front, it narrows down to 250 mm. A Moki S180 (255 mm) will most likely fit, as well as a Saito FG-90 (250 mm) or a UMS 7-90 (230 mm). A UMS 9-115 (260 mm) may also fit, but it may become very tight. The UMS 5-125 (265 mm) is likely too large for this cowl.

Oliver

TimD.

My Feedback: (207)

Word Is, the US will not get any till end of Feb - beginning of March. There are only a few coming in that shipment..

I have a USM 7-90 waiting for mine.

warbirdfan2

The photos that I have seen on their website shows the bottom of the airplane painted grey. Is this right? I thought all the ones I have ever seen were white?

sg26565

Yes, the bottom is painted grey, which differs from the original.

sg26565

Some comments regarding the quality of the kit (I still can't post any photos because I need to do four more posts ):

• In my opinion, the overall quality of the kit is very good, at least far above average compared to other kits from China.
• The landing gear seems to be very robust. I have the landing gear from TopRC, not the one from Robart.

sg26565

However, there are also some things, that I don't like.

• The wing servos are mounted using L brackets. The same L brackets are used for the gear door servos. With two aileron, four flap and two gear door servos, we get eight in total. However, only twelve L brackets are shipped. I made four more by myself.
• There are two different kinds of hinges for the flaps. Eight of one kind and four others. However, the manual does not tell where they should go. We asked TopRC for advice and they told us that the eight go into the center wing and the other four into the outer wings.
• The pushrods for the gear doors are too short so that the doors don't close completely. I had to replace them with longer ones that I had laying around.
• The springs in the oleo struts are way too hard and too long. My oleo struts did not move at all. I had to replace the springs. When I disassembled the oleo strut, I discovered that the original springs were deformed because they had been mounted using extreme force.

sg26565

There are no holes for the pushrods for the ailerons and elevators. You have to cut them into the composite yourself. My result was not optimal. However, most of the time, you don't see the holes on the bottom side of the wings.

sg26565

I finished the assembly of my Corsair with a Moki S180. The propeller arrived today. The plane weights app. 16 kg without fuel. Therefore, Take-off weight will be around 17 kg. This is not too far away from the 16.8 kg specified in the manual. The website talks about 13 - 15 kg, which is unrealistic. Even with a smaller engine, you need to add a lot of nose weight to achieve the correct center of gravity. I prefer to carry a larger motor instead of lead .

sg26565

Now that I made ten posts, I can finally share some photos. For an ARF warbird, the level of detail is very good.

sg26565

As previously mentioned, I installed a Moki S180 engine. This made mounting of the cowl a bit challenging because the ply cowl frame will not move over the engine. Instead of clueing the frame into the cowl, I attached it to the fuselage and used five threaded rods to connect it to the air guide for the engine. The air guide was then glued to the cowl. Aluminum tubes ensure the correct distance.

The cowl frame and the air guide

Mounted to the fuselage without engine

... and with engine

The air will flow close to the cylinders for a good cooling effect.

The air guide was glued into the cowl. Aluminum tubes take care of the correct distance.

Everything mounted together.

sg26565

As mentioned earlier, there are two different kinds of hinges for the flaps, but the manual does not tell which should go where. Here is a picture that we received from TopRC after we asked for advise.

Note: The hinges for the outer wings have small tooths.

sg26565

Finally, some words about the landing gear. I bought the original one from TopRC and this one looks quite robust. However, the springs in the oleo struts were a total disaster. The springs are too strong, too long and mine were already damaged.


My springs were already damaged because they were mounted with extreme force.

I had to replace the springs with softer ones. Ideally, you would take 100 mm springs with a spring rate of approximately 5 newtons per mm. However, I was not able to find springs with these characteristics. Therefore, I used two 50 mm springs for each side.

That's it from my side. I'm now waiting for better weather to take the new plane outside.

Regards,
Oliver

sg26565

The manufacturer released new photos on his web site. The manual is now also on-line.

80CC F4U - Scale warbirds - TopRCModel SCALE WARBIRDS,JET, PATTERN, BOATS & MULTIROTOR

marksp

My Feedback: (9)

Wow...you’re cowl mounting/baffle looks great!

Did you require any additional weight to balance?

Cheers

sg26565

With the Moki, it's almost on level. With a smaller engine, you would need extra nose weight.

marksp

My Feedback: (9)

How many servos required for the build? Manual says 8, which i assume are (2) aileron, (2) flap, (2) elevator, throttle & rudder. What about gear doors? Center vs outside flaps? Are elevators standard size servos?

Cheers