RC India

Hello Everyone.

I have been trying to get into this hobby. I have built 3 models so far, of which first two did not fly. The third one did and crashed very hard. Nat geo air crash investigation is going on.

Here are some details:

Configuration: Pusher
Airfoil : Kfm3
Wingspan : 54 in
Chord : 9 in
Length : 39 in
Motor : 1000kv no name orange color chinese motor
Prop : 1045
ESC : 40A
TX/RX : Flysky i6
Battery : 2200mAh Turnigy 30C
Control Surface : Ailerons, Elevator (No Rudder)
AUW : 770gms

Little bit of downthrust.

The plane was very hard to control, I mean it wont respond to the inputs. CG was at 25% chord length.

Suggestions are welcome.

Swapnil N.

https://youtu.be/VsVYMIb5d8Y

Keep trying mitra... You will succeed one day. Nice place to fly RC planes.

Yes Thank you.

i made this type of design few years back.

pointers

1 practice more on simulator.as i could see and feel that you put wrong input on radio  when plane nose was pointing you
2 build a new model which is already tested and flown

Oh yes. That is correct I must search for the design that has been tested.

Actually i just gave throttle and elevator and nothing else. Trust me. It circled on its own.

How do i connect Flysky i6 to my PC? Hardware required?

Thanks.

Hope your model is repairable and not really 'RIP'.

1. That gaping hole in the front top has to be closed. Its acting like a huge air dam or airbrake

2. Hand launch has to be gentle and level. Will need only a small touch of up elevator for less than a second if your CG is more or less correct. Not like a third man throwing a ball from the boundary to the wicketkeeper!

3. It didn't 'circle'. It stalled and spun. Stall due to low airspeed caused by too high launch angle and too much up elevator.

Best of luck for next attempt.

Here is a short 32sec video of a smooth hand launch...
https://www.youtube.com/watch?v=C96oiT0ndgE&ebc=ANyPxKorV7_-AdeL_t-qr9N8W9mjjbg_CZmJbG-z9rSIDgBAjxwNhzNmdERAr3mK0UdVKuuN_MXK1gCiXw-to0j2Dpk6lWcw7Q

Where is this place in Thane? If close, I can help you with your flying.

It is near lake Upwan. Vartak Nagar , cadbury company.

Sir, You have made it crystal clear that how the plane should be launched.

I'll close that front hole in the next build. I thought half of the propeller is exposed to the air and lower half should also be. So I kept it open. Otherwise only upper half of the propeller will generate thrust which will cause pitch down tendancy and motor bearing might wear out.

Thank you.

SWAPNIL N.

Maybe thrust angle issue, or ailerons are not centered.

do what i am telling you . do not waste your time on this ,as i have build the same plane initially . you do not require sim or hardware as i can see you can take off , if you spend time on correcting this plane it will take a long time ,so build new one , i mean a tested plan .once you get success in that then go back on this plane , then you will find out something which cannot be learned in words .

also few of them above are my seniors so do what they are saying ignore this post

Yes I'll build new one.
This time simple 3 CH, dihedral wing.
Thank you.

As promised i built 3 CH simple plane
Specifications
Airfoil : Kfm2
WS : 40in
Chord : 10in
Electrics are as above,

Here is the result

https://youtu.be/qhDy_EF5-no

Nice!

Thanks

Does anyone have an idea, how to join two halves of dihedral wing together ? I mean what technique do you use.

hi Swapnil,
I stay in thane and fly every Saturday with a few friends. you can join us as well...Will pm my number to you.

However I am unable to figure out where is this place near Upawan

Shreekant

Here is another video

https://youtu.be/LBtv13cXMw0

Good swapnil
Please recheck the CG. It seems to be tail heavy, and little under powered.

Yes it is underpowered. Will upgrade to 1045 from 8045. CG seems to be OK currently at 30%

1. Increasing prop size will only work if the motor can take the extra load
2. Looks tail heavy in the video. Pl try a little nose weight.

Regards

Yes I'll add some weight.

try Cg at 25 %

OK. I'll try @25%

Hello everyone.

I am ready with new plane.

I wish to know does it glide well? Have not flown it yet.

https://youtu.be/JjkczBZCXCI

@swapnilnimbalkar,
Your glide test proved 2 things:
1. It will fly straight and not turn sharply to either side
2. It will not roll unexpectedly to either side

This is to be expected once you reach the stage where your construction is fairly accurate.
You have obviously reached that stage.

A test glide is usually used to check if the CG position (and elevator trim) are approximately correct.
Your test doesn't address this because:
1. It is too short
2. Launch is nose high, leading to speed reduction, followed by dive.

Please try a longer test glide, over grass, with the nose slightly down, at about the speed you think it will fly at without power.

The objective is to find the CG position where it will fly without lifting or dropping the nose.

Somewhere in my RCTLG thread, there's a video of a test glide that went 60 metres from a 2 metre launch height!

(That was a specialised glider (no motor) designed for a high glide ratio. Yours will probably do 10-20 metres, long enough to judge if it needs weight in the nose or tail)

Here's the YouTube link. Hope it helps to show how to launch for a glide test.
Best of luck.
https://www.youtube.com/watch?feature=youtube_gdata_player&v=ie2thgI193A

Wow. Very nicely explained sir. I really appreciate that.

Finger trouble is what it looks like, nothing wrong with the plane IMHO

That did boost my confidence.

R I P My Plane No more. It flew great.

Today I did the maiden flight. The plane was very gentle and slow flying, the way i wanted it to be.

Specs:

Airfoil: Clark Y
Chord: 10 in
WS: 60 in
AUW: 795 grams


I am very thankful to the people who helped especially Mr.K.K.Iyer Sir.

I still have two problems though,
1) It wants to turn to right on its own, even after trimming.
2) Motor vibrates a lot.

Here is the video.

https://www.youtube.com/watch?v=QQYQycZ1aYs

Its nice fly.

1. The problem may be, the angle of motor is not in the straight line. Though you trim the rudder, it will not help. Check the motor orientation.

2. More vibration may be issue in motor itself, or imbalance prop, or improper motor mount. The motor mount had to be fixed in reinforced area.

Yes the motor mount is in bad condition. Thanks.