Primi

Guys,

if of any interest, I found two youtube clips of this plane, as it looks it flies.

Any more clips out there?

https://www.youtube.com/watch?v=bVkajJZ9B8E


https://www.youtube.com/watch?v=FgPqbW7ng-A

Primi

The exhaust system was an other challenge as everything is very tight in the cowl area and the trust angle was not a help as well shifting the engine towards one side.
A few copper pipes and angles and a little bit silver solder made it eventually right.
The gap at the cowl was just big enough to get the pipes through, this way I don't have to cut anything. Before I paint the fibre glass parts I will heat treat them with ceramic paint, this works very well as I used it before on other planes where hot metal touch fibre glass.

Primi

I had some thoughts of getting the exhaust trough the fuse and use the scale moulded indent, but cutting the fuse at this place would be not a good move because I don't trust the fibre glass work in this area. I had to reinforce the fire wall inside because it was not well attached to the sides!



But a bit of carbon fibre and epoxy solved this issue, was not that easy because of access issues. If it was done right in the first place would be a lot better!

In the meanwhile I received the electric actuators for the gear doors from HobbyKing, unfortunately I have to find some other purpose for it as they were not usable. The biggest problem was the actuators have an overrun 1.5mm which is a problem on closing, it would always flex the door when closed and would damage it over time, also the size was not on the small side either. Therefore I went back to the air actuator version and ordered air actuators from robart. Unfortunately I will still have an air system in the plane as long as it works!

Primi

For the access hatch I decided to use rare-earth magnets four of them gave the hatch a very strong hold and flush mounted its just easy to remove the hatch by sliding it sideways away.



Closed Open

A few pictures of the tail wheel install and the steering servo, which is below the cockpit.


For the engine I need also baffling in the cowl, instead of buying the expensive laser cut version I took the picture of the web, spend some time in photo shop and sized it to the right size for my engine then traced it on a 3mm ply and cut it on the scroll saw.

Result was satisfactory

Primi

For your interest I have done some more work on the Corsair


Painted the inside the cowl with Epoxy so that no oil can penetrate the fibre glass, very useful if later you have to glue something to or into the cowl or for repairs.
Also glassed the engine baffle with a layer of glass on each side and between two old window glass sheets which will give a nice finish.
Made up a battery box to hold 3 two cell Lipos, which will be installed next to the tank as much as to the front as possible.
The ignition box is just behind the fire wall to the right the battery box, behind the choke servo, to the left the fuel pump and the throttle servo. You will think you have a lot of room in this big fuse, at least I was thinking that on the beginning, WRONG!
A 1l Tank had to be squizzed into between the ignition box and the top of the fuse, because of the fuel pump the location and orientation is not so important. I used the most forward location which is also close to the CofG.
Fuel pump and tank plumed
Front end all fuel proved with epoxy before painting
Receiver and throttle servo with control board for receiver switch and air pressure with fuel dot. This way I don't have any switches on the out side.

At the moment it looks like I'm the only one building one of these birds despite the fact that many of these are on offer on the net!

jonkoppisch

My Feedback: (162)

Are you saying there are some around for sale?

Primi

Yes I found it on European sites under different names but with the same picture and size!
See the links below and search for "Corsair 94in" on Google

http://wild-technik.de/shop/product_...ucts_id=102046
http://www.jfchobby.com/en/html/Prod...273&SortID=198
http://www.cymodel.com/cn/pro_view.asp?id=96&cid=6&scid=

Primi

Finally I got the engine installed and the cowl, also received the remaining parts to further progress. As I have not yet the cockpit I need the canopy removable to access the steering servo and install later the cockpit. This was only possible with a screwed canopy. Luckily I had some size 1# Philips head screws, the pack of hundred was just enough. I used every 10mm a screw as otherwise the canopy edge will worbe in the sun and will look terrible. This is not 100% scale but that was also not the intension.

Primi

A few more pictures of some slow progress I made on the Corsair.

made some multi connector for the 4 servo cables including retract
also had to made a underlay for the wing to get it level as the centre piece is wrong moulded!
the exhaust system painted and installed
tail wheel door and cover painted and installed
the current tail wheel doors are not scale so as the tail wheel it self, but can be modified later to more scale look.

SWORDSN

My Feedback: (13)

Can't wait to see her fly. I like your home town Primi

Primi

Hi Swordsn,
yes I can't wait to see her flying as well and one is sure it will be soon!

The trickiest part was the gear doors as how to operate and install the require actuators, I locked into electric actuators and air actuators found than the air actuators from Robart to be the best choice, because of available room in the gear well. As it could not be cut too much room was limited. The gear well is part of the structure cutting too much into would weaken the wing!
Anyway all what was left was to work out the position and how to link the actuators with the doors below picture will show this. For the front wheel some further manufacturing of a clamp was required. I had some water pipe elbows laying around which had the exact diameter of the leg, cutting a slice and soldering some nuts ended in a satisfactory clamp for the front door linkage.


This is the modified fuse wing mount after painting and airbrushing

Gears retracted

Gear door cylinders installed and linked

Linkage for front door with some stiffener glued into the inner skin

My pipe clamp for the front linkage



Video of operation will follow soon!

Primi

This is the video of the first few tests of my Corsair landing gear and doors working!


https://www.youtube.com/watch?v=STPS8PgcQAs

ultimate-micha

Thank you very much for this thread! We just bought a CY Models 94 inch Corsair ("bird cage") in Germany, unfortunately before finding the thread here. We were somehow shocked about the condition of the parts, which we found exactly as described above. However, we made a deal with the shop and kept the stuff including the landing gear. I would call it a "collection of some useful parts" rather than a kit. I am quite concerned about the structural stability of the wing´s centre part and the fuselage cockpit section, so we investigate currently how we can improve these, on top of the rework and modifications described above.

Did somebody fly the model?
Kind regards - Michael

Primi

Hi Michael,

I only saw the flying video of the sales promotion what I believe it was, therefore I believe it will fly as long as the CG is wright and you have enough power basically everthing would fly!
In Australia is this model not anymore available, Austar has removed it from their website.
Anyhow as you discovered this is not a beginners plane in all perspectives. But it is possible do make a resonable model out of it. This weekend I planed to run the engine and tune it. The week after have the maiden if weather permits. I will have a flying video availble when I get it airborne, xrossing fingers all work's out!

Gruss Michael

IFLYRC-RCU

My Feedback: (28)

Good luck with the Corsair! I like the birdcage.. it's different and unique.

Should be a monster with that super cool engine!!!

I have just completed a 98" Easy Tiger Macchi 205. After 2 flights, I have a suggestion - both flights have shown weakness in the various glue joints in areas I could not see or access. I too had to reinforce the firwall and a few of the wing formers.. those I could see.

First flight: loose tail mounting tube.. some serious inspection revealed almost no glue - poor joint. Added some Gorilla glue to re-secure the tube in place. That stuff expands and locks stuff together. Perfect for this as I couldn't reach it.. had to use a long stick to insert it through the small tail cone hole at the rear of fuse. It worked well though.. albiet a bit sloppy.

Second flight - much bigger issue.... tail went into flutter.. I have a Q 100 in this and it was going at least 100 mph... and the tail section went into flutter - luckily, I was able to save the plane.. post inspection showed the fuse formers had come loose. Flight report here: http://www.rcuniverse.com/forum/rc-w...tro-98-ws.html

So - please add some Gorilla glue to ALL of you formers.. let it expand and lock your formers in place! lt almost cost me the plane - don't want this to happen to you as well! Lay the fuse on it's side, do one side at a time. let the glue run down the former/fuse joint. Let it sit overnight. Repeat on the other side. Glue expands about 3 times what is put on. I also plan to add some rudder posts locking the fin to the bottom of the fuse. That is also weak - I suspect the construction is very similar on yours. Wish I had known this BEFORE I flew the airplane!

Airframe flies absoluely great by the way.. suspect your will too.

Good luck mate ! Have fun ! Post flight reports !!

98" Easy Tiger Macchi - repanted and scaled up a bit -

Primi

Thanks IFLYRC for your nice commends, I have already strengthen all glue joints as good as possible during the build as they used some sort of heat glue and or epoxy which never was hard on all corners, as you said very bad.
I checked you build report and very impressive what you did with yours, you definitely got a very nice airplane. Hope you have also a lot more of enjoyable flights with yours. I have done already the pre heavy model inspection and also the engine run-up today. Therefore have all ready for rocken rol on the next best weekend!
So fingers crossed and all will be good

Primi

For your pleasure the first video of the engine running and plane fully assembled.

https://www.youtube.com/watch?v=25BQjdBgWeM

IFLYRC-RCU

My Feedback: (28)

Nice! That thing sounds great. Good luck on your test flight!

Shaun Evans

Wow.

Primi, you're a good builder and a patient one, too! I enjoyed reading through that thread and I'm sure you've got a strong feeling of triumph to have worked through all of those problems that the 'ARF' presented. Maybe I'm just spoiled, but some of those fix-it issues were downright shocking to me. I can't believe they shipped you a set of landing gear that didn't fit the airplane they were designed for, for example.

Frankly, after reading the seller's semi-psychotic rant in the for-sale section linked to this thread, I was expecting to see a well-built, good-value ARF in your build. Instead, I saw that this trend toward 'big, but underdeveloped' from Chinese ARF companies isn't limited to jets. It's like they're saying, 'Hey, End-User, here's a box of stuff that looks like a Corsair. Could you help us out with the R&D? Oh, and we hope everything holds together when you try to fly it!'

You've done a superb job of it, though. Good luck!

dmyers0403

My Feedback: (48)

I also appreciate this build and his skills at addressesing the structural and design faults of this kit. I purchased mine several years ago but have put it in storage because of these concerns. Anxiously awaiting his maiden. I still have reservations about the main wingspar. The advertised three piece wing is a joke as it must be glued together, as he has done, for joiner strength unless major mods are made. You just have to see the original retract mount design to see how frail they are.
Again, Great job on build. Looking for a great maiden report.
Wilth a good maiden report I will dust kit off as soon as other projects are complete.

Primi

standing on wing after test still all good

One interesting test which I made because of some concerns made aware by others before I take this bird up.
How good and strong is the middle part?
Simple I took the spare one which was original badly glued and replaced with a better manufactured one, therefore surplus to me and only for test's used.
I suspended the part from ground with two sand bags and stood on it with my 90kg.
All gooda, the skin worbed a bit but did not break or cracked the internal. So I believe it should take at least 4,5g's, enough for a loop, I guess.

The final test will be at the maiden!!!!! Coming soon

IFLYRC-RCU

My Feedback: (28)

Looking foward to that "Final Test" !

Have been waiting for a flight report . . . Good luck!

dmyers0403

My Feedback: (48)

Any Flight Report on this Corsair yet???
I guess your the genny pig before I invest time and money in assembling mine!!

Primi

Due to some other projects like the ultimate kit build below and the little CARF Yak55 I finished quickly the last few weeks I got a bit side tracked with my Corsair.
Good you remembered me, I have to get to the field and just do it, I guess.

SWORDSN

My Feedback: (13)

It's hard to put that much money and effort up for the first time.We feel for you and we are waiting,there is no pressure on us.