EDF ARF SU-27 Flanker Built

[ER69]

After I had scrapped my Mirage 2000 couple of weeks ago,
I decided to built another EDF Jet about its size by twice the power.
one day, I visited a LHS and this ARF SU-27 really caught my attention so I decided to make it my next project, no doubt i still have a on going project in hand.

This jet is actually designed as a pusher but i will convert it into ducted with landing gears.

Ok here are the specs of this SU 27

wing Span :670mm
Length : 900mm
Flying weight : 530 (Pusher) recon
: about 1kg (Ducted)
DF : 2 x SF DF units
Motor :2 x Rcer Warp4 2turn
ESC : 2 x CC45
Batt : 3s2p1800 (20c)
Amp draw : 38A +-

[ER69]

Glassing of the fuse

To have a smooth and clean fuse / duct, I decided to glass the whole kit with resin and 3/4oz glass cloth.
End of the day, it will add some weight.

[ER69]

EDF Unit

EDF units

[ER69]

Ailerons Modification

The exisiting control system design of this EDF jets is by using only tailerons and its control by 2 servos pulling from the wings with carbon rods.
Well, I think it makes this so called "scale" Jet looks ugly.
So I decided to do some modification to it, to make it looks more "scale" looking, by adding ailerons for the wings and make the tailerons into elevator.
First, I covered the exisiting servos support holes with foam filler and make 2 new one for it.
That mean i will be using 2x HS55 for ailerons and 1x HS56 for tail.

[zennith]

Edf Su27

Dear ER69
I am Zennith, I bought the Su27 when I first saw in the shop. After sanding the whole body, I found that the elevator got a fifty cents coins size indent form by the molding process. Tyring hard to cover that by depron but bad looking. How do you reduce the uglyness? I also found that the I got a power system problem - Batteries to power her Poliy questx2 at the nose compartment C.G. moves. Also the mounting for the fan is rather weak very little holding on her body (the half cut on the top and bottom body only give me partial holding- problem.... I hold back the building.
When are you doing a median flight, do allowed me to join you for the flight.
Help is required from expert for the building...
Zennith

How is your EDF A10? flew...

[ER69]

Landing gears

I like to R.O.G. planes.
For me, the most enjoyable part of RC flying is by watching the plane taking off and landing
Therefore, How can i build this EDF jet without landing gears.

I had relocated the forward nose gear by swifting it more to the aft, coz i think the existing position on the it is way too forward.

I asked one of my flying Kaki about the location to fix the main gear, His suggestion is that to place it somewhere in the middle of the bottom Fuselage.
At first, I was thinking about putting it at the C.G. point or slightly backward.
but he told me that It might hit the afterbuner when taking off or landing.

[HZM]

Looking good

Mike

[Adrianli]

Nice work!!

When maiden? Must post hor.

[Warbird]

Jup, nice work !!
I agree landing and take-off are the most interesting parts of flying.
Good, light and small retracts is what the world is waiting for. Until then I will use bungee !!

[ER69]

Nice work!!

When maiden? Must post hor.

Maiden i guess will be next weekend if things are going smoothly
Coz I only can squeeze out 1-2 hrs of building time every nite

[ER69]

Jup, nice work !!
I agree landing and take-off are the most interesting parts of flying.
Good, light and small retracts is what the world is waiting for. Until then I will use bungee !!

Yup, hopefully some day, retracts makers can come out some small & light air retracts which can hold Jets of this size.
Or shall we go for bigger size EDF Jets so we no need to wait for that small retracts?..

[ER69]

Dear ER69
I am Zennith, I bought the Su27 when I first saw in the shop. After sanding the whole body, I found that the elevator got a fifty cents coins size indent form by the molding process. Tyring hard to cover that by depron but bad looking. How do you reduce the uglyness? I also found that the I got a power system problem - Batteries to power her Poliy questx2 at the nose compartment C.G. moves. Also the mounting for the fan is rather weak very little holding on her body (the half cut on the top and bottom body only give me partial holding- problem.... I hold back the building.
When are you doing a median flight, do allowed me to join you for the flight.
Help is required from expert for the building...
Zennith

How is your EDF A10? flew...

Hi Zennith,
Regards the Injection mold mark, wat you can do is, use grade 180-220 sand paper to sand it till level, then fill up with foam fillers (which can purchase from NTC) , after filler completely dried up, sand again, Thats it.

As for the batts compartment, I had cutted out the bulkhead inside the turtle neck and strengthen it with balsa at the bottom, by doing this, I will have more room to play around with when placing those batts to meet the C.G.

Wat I did to support my DF unit is that, I cutted out some 3mm depron to lay and epoxy them over the Support at the exsiting duct (Top & Bottom).in order to make it level with the ducting. Then i cutted slot on the DF support area to hold the DF unit "ears" ( Check check out those pics that i had posted for better idea)

[ER69]

Elevators Modification

I had modified the tailerons into elevators which will be pulling by a HS 56 servo. here are some pictures of the mod.

[ER69]

Mod on the Front nose gear.

Yesterday, I received an SMS from my friend who had the same landing gear and kit as mine.
He did a test on R.O.G, claim that the landing gears are infact very weak.
He told me that the wheel shaft had infact "Melted" (guess is due to fiction). Weak materials .
Since i am still building this Jet at the moment, I decided to replace the nose gear wheel's shaft with metal rod. No doubt it will add some weight, but better than having a melted gear when landing ya

[ER69]

Hi Zennith,
Notice that you had encountered some problem when building this SU.
Hey, perhaps you can post some picture of it, I think other flyers had built this can also guide you along, worry no more, all problem can be solved, once started dont stop half way.
Anyway, that is the problem wth those "Clone" kit,
It normally comes with a very simple building instructions and most of the time with wrong C.G. point stated.
Thats why Frank is having his worst time getting the C.G right.
and Thats also the reason why i started this building tread.
May the force be with us..