EDF ARF SU-27 Flanker Built

[ER69]

by the way I am certified jet engine engineer for real airplanes, would be really interested to see how the miniature jet works

Cool next time you can do the pre-flight check for me then...

[ER69]

Hi ER69, good to see pictures of your Hawk.., mine is still in the box too much work on and too many projects at the moment. Just a point about fitting a sucker in the Hawk please beware it is not designed for suckers, AMD have now released a sucker version and there are a few differences in the tail end (check the web site). Not sure if you have read the destructions (sure that you have) but the all flying stabilser torque rod goes right through the jet pipe...! so some serious engineering is required here. Of course I am sure that you are capable of doing same and would be interested to hear of the modification that you perform. Also on the AMD web site is a video of the 46 size ICDF version in fright, long take off but once airbourne boy does she boogie...

Yo Dennis,

WAT? yours is still in BOX?

Yup, I am aware of the AMD sucker version hawk,
Well, guess we have to do lots of re-enforcement on our airframe/wings and some heat proofing job as well before throwing a sucker into it..
OMG, there will be lots of work to be done mann.....
Anyway, I will see how it goes then..

Cheers mate















I had read about it

[DennisP]

Hi ER69 perhaps we should start a new thread rather than hi-jacking this one..? I was going to send a mail to AMD and ask if they could provide a conversion kit..? The other option is to wait until they put the manual on line for the sucker version then the secret will be out...

[ER69]

Hi ER69 perhaps we should start a new thread rather than hi-jacking this one..? I was going to send a mail to AMD and ask if they could provide a conversion kit..? The other option is to wait until they put the manual on line for the sucker version then the secret will be out...

Yeah .. that will be great..
Yo Dennis, you are the man..

[madflurry]

some questions

hi there

i'm new to EDF jet and i thought of getting the SU27 for my first. Just wanted to ask a few questions about this jet. Is conventional brush motor enough to power this jet? or do you need brushless to do the job? and is there any other nice to fly jets out there to recommend? thank you!

[Babylon5]

hi there

i'm new to EDF jet and i thought of getting the SU27 for my first. Just wanted to ask a few questions about this jet. Is conventional brush motor enough to power this jet? or do you need brushless to do the job? and is there any other nice to fly jets out there to recommend? thank you!

Hi madflurry, if you check Er69 and others on the SU27. This plane is definitely not a good candidate for new EDF experiment.
You should try the DF10 interceptor available at JH or champion H.
Easy to hand launch and can be flown with just 21-23 amps on 3 cells(220watts seup) with stock 68mm SF(get the SFM -Taiwan 6 bladed available at JH) or Wemotec480 and a good Brushless motor.

EDF can be flown with brushed motor.
With such a high rpm required for EDF, the brush motor will degrade or burn out sooner or later. So why use the brushed motor when low cost BLm BL430-3.55KV align motor + SFM 68mm EDF can do the job.
You need at least 30 amps ESC(better get 40amps or higher)

The other good candidate is the Micro-jet from multiplex or China made that uses stock 55mm EDF. Go to my thread on micro-jet edf .
The plane require just mere 120-130watts on brushless motor for a good descent flight and go up to 170-180 watts for hotter setup/flight.

You can also try DIY dupron EDF plane. They are cheap easy to built and flies pretty fast.
My First EDF was a DIY dupron plane.


Cheers
Babylon5

[ER69]

Dear Moderators,

Regarding your PM noted with thanks.
Sorry for posting the BBAFC RC Jamboree thread in DH.
I am really shock & sorry to hear such a reply from DH.
My intention is to share infos with others and I always thought that this is a place to meet and to share our hobby.
Since you had stated it so clearly that my posting are not welcome in DH, I really have nothing to say.
Anyway, Appreciate if you could delete all my posting in DH and sorry for sharing my build threads with the rest of the members in DH.

Cheers
ER69

[pakana]

why is the su-27 definitely not a good choice for first edf? whats the difficulty? building or flying or both?

or is it like mc people keep saying you shouldnt buy a litre racebike as for your first bike?

for a while ive been thinking of getting a plane for me and i want the su-27! building will not be a problem for me but flying is another thing. maiden flight especially. perhaps i get back to building after that

[Babylon5]

Hi Pakana, if you go thru the thread and others ,this plane needs alot of power and buliding it right to fly right.
Many people will tell you they successful hand launch this plane EDF version. On the other hand there are folks out there who did not sucessfully flew this jet on their maiden.
Even in a pusher version I had my failures too.
As I said before if you never try it you will never find out. ..but believe me this plane ain't as tame as a lamb when you first maiden it.

Good luck to you.

[pakana]

thanks for answering babylon!
so far ive managed to find only two threads about this plane, this and the other on rcgroups. is there more..?
as i mentioned im quite fascinated with the flanker and only thing that bugs me is that it requires two motors which like you said need to be top notch for the purpose (esc too). so all included its gonna cost more than a single engine jet..

if 68mm fans are to be used would a pair of typhoon edf 2w motors (4580kv) be enough to push the thing up? if i'd get some good 60a (50a-70a recommended) ecs's to couple them what would be the optimum battery?
does it fly good at low speeds? on some forum someone said this can speed up to 120mph , but you should reinforce the plane first. or not bank at those speeds

lots of q's, thats just few things that came to mind, hoping for answer

[pakana]

one more: since im likely going to crash it what is the chance i only f**k up the fuselage and not the electronics? can they take hits? meaning taking hits in the foam fuselage not under a hammer?

[Babylon5]

one more: since im likely going to crash it what is the chance i only f**k up the fuselage and not the electronics? can they take hits? meaning taking hits in the foam fuselage not under a hammer?

Hi Pakana, looks like you are very keen on the SU27.
Don't know which kit are you using . I am on Ultra Fly series .
You should always look for sucess in your maiden. I have modified the Ultra fly su27 for both single EDF and pusher with fix landing gear.
First time hand launch the SU27 with a pusher outrunner (no landing gear) result in a broken nose at 2 places.


Assuming you want to achieve a thrust to weight ratio of 1:1 and your plane weights 1000grams.
Assuming your EDF can achieve 30grams(in most cases it is less) of thrust per amps.
The minimun total current will be roughly 1000/30= 33 amps +++.
In most cases you will need even more current and power for shorter take off .


When u are using the 4+++KV motor on twin (I guess on 3 cells lipo on each EDF) will be drawing lots of current. You probably need twin pack LIPOS and that will make your plane heavier. Anything over 900 grams on this plane with such a relative small wing area will make the w/L ratio high so need longer runway and the landing will be coming in hot. In short this plane will fly like a brick.
I do not have experience on the Typhoon motor but I can tell you that this motor will draw very high current on the Wemotec480. Maybe you can ask Warbird for more advice.

For other the twin EDF look at ER69 thread or seek their advice.

BTW where do you fly your plane.

All the best

[DennisP]

The small amount of testing that I and others have done when you use a HET Typoon 2W it will draw a lot of Amps and we are talking up in the 50 to 60 Amp range on a Minifan. A modified Jet Hanger Hawk using a Minfan and a Typoon flies great on a 3S2P 2200mA pack CC60 ESC, actually it is two 3S1P packs in paralell so for the SU I suspect you will double this if you have two motors and that is a lot of weight you will be hauling around the sky.

[pakana]

thanks for input guys,
i have ordered an amd su27 kit, with two 68mm 5-blade fans. they look like wemotec but they arent. theyre gonna cost roughly 80 euros, havent received the package yet..
looks like it will be difficult to get this running with higk kv motors since they draw so much amps. on amd forum i asked what motors should i use they said at least 3600kv. how big is the difference in power consumption between 36xx motors and 4xxx motors? i should try to get a lot of info on this before i start getting suitable batteries and other stuff. weight is on my mind but shouldnt powerful engines compensate on the weight no batter if it flies like a brick as long as its a fast brick

amd also sells this other sukhoi, su-35 with the canards and everything, which is designed to be a slope glider and has a big, overscaled wing, some say it looks horrible but ive been wondering could it be fitted fith twin edf units? would be cool.. ill try to post a link about it if i find,,,,

babylon, i have no idea where im going to fly, propably some nearby grassfield.

im on duty, more later.....

[Babylon5]

Hi Pakana, just make sure the 5 blade wemotec clone ....thats what I call them are balance. If they don't balance there will vibrate like m......and probably throw out the blade so do take some precautions.

Best of luck.