RC Scale Roban 470 AH-1 Cobra Part 2/ Killer Cobra Strikes Again!!! 

You gave it your all friend, just a badly design fuselage. I've watched a lot of builders and consider you one of the best👍

Its like Christmas when I see a new video. I have a Roban 700 EC665 and never had this issue. It seems the fiberglass is weak in the upper par when you wiggled it while mechs were in fuselage. Cant you expoxy carbon fiber weave to the fuselage going back of the turbine exhaust and on the sides and top? Also you can get resonance in the skids..where it looked like it originated. Sorry

Got the same problem with my 700 Roban. Everything is balanced but the tail shakes like hell. Found the the torque tube was 3 grams heavier on one side of the tube on my balancer. Ordered another torque tube and it arrived bent. Went to order another and now there out of stock. 😂

I will agree is something you really have to work with I got mines in the air and was able to maintain it I have two videos on here both of them are with a four bladed head

Thanks for putting out the videos, really enjoy your content.

Yeah, I would scrap it. Some helis are just seemed destined to be nothing but a money pit and give you pure frustration. Definitely Time to move on.

Looks like the blades have sucked in the canopy. You did nothing wrong. Its a miss construction for me.

I FEEL YOUR PAIN,YEARS AGO WHEN THE BLADE 400 WAS POPULAR,I HAD THE SAME SCENARIO THE CURE WAS 9T MOTOR PINION 3000KV AND MORE PITCH AND WORK WITH THROTLE CURVE, FOR FUSELAGE YOU DONT DO - 5 ON THE LOWER PITCH WILL RAMP THE MECHANIC AND CREATE ROSONANCE LIKE YOU READY FOR 3D...

I feel for you man. It's never seemed right, just a horrible airframe.

Brother - I feel your pain !! (probably not exactly to the same degree as you though)

Something else that really helped mine and the shakes Is i took a lot of time and CG’d and balanced my stock blades which were off a lot in CG to each other , sure helped with the resonant airframe destructing vibes . I about gave up on mine too but now I own 2 lol 😂 they’re just too cool looking and sound great in air. And the belt actually holds up which was my main concern . I’ve had a few times on my camo version where the one way bearing locked up I have to reach in hold gear and pop it free and I made some landing gear legs out of heated plastic tube , if you’d ever want send yours to me I’ll fit it with extra GTB rotor head I have ( shortens height ) ,do the anti rotation link mod ,balance it all out get it flying and send it back for cost of shipping ! I only know the spectrum FBL controller though and I live in the states . Wish I was closer to help you out with everything i’ve learned over last year on these cobras .

It's a shame, so much work🤐. Anyway, Merry Christmas and a Happy New Year from Germany.👍

And add a 500 size servo for the tail holds much better

I feel your pain have the gray and camo versions got them both flying pretty good after months of toiling and trial and error using a shorter GTB 450 rotor head shortened the control rods to swashplate changed the anti rotation link to plastic link and took off counter weight that was on 3 mm machine screw , had both do a resonance frequency and rubbed out top of fuselage hole but once it was balanced at low speeds the resonance never came back this is with original balanced blades and mid stick 5 degrees max is 10.8 deg but I’m always very wary of another crazy event that tears it apart in flight just don’t trust them ….

Wow I had the same problem with a Roban Airwolf :(((

Just one of those things Rob when nothing will work, with your patience I'm sure you would come to it another day & have it sorted... But prob time to move on like you say

Hello. Tell me, what was the problem with the helicopter?

sea harrier is a dead project?

Adjust the dials on the ar7210bx can't remember which one u need to adjust??

It is not stiff enough at all. Normaly u have these sidewalls which make it stiff. It must vibrate. With the higher head speed u just come out of the resonance frequenz

Not good when you have issues like that. I’m thinking the issue you were having was caused by the way gram was mounted in the fuselage. Not rigid enough I know you said you were going to scrap it but why not build a whole new frame and mounting system? And use all align mechanics. That’s what I would do, It’s a nice looking heli and would love to see you have sone success with it.

To much head speed create resonance.. hapens to me one time i learn the hard way .. head speed had to be 1700 rpm