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HomeAircraftHelicopterMain Discussion › thunder tiger e550 and ar7200 porpoising
05-30-2018 11:30 PM  83 days agoPost 1
motorrc

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canton ohio usa

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I have a thunder tiger e550 with a thunder tiger flb head and ar7200 gyro that porpoises on forward flight. I have changed values in parameter C, worse in red solid but still does it in blue solid, changed dial 1 and 2 to multiple values, changed the rotor blades, checked balance, replaced all four bearings in head and two main mast bearings, none of which solved the problem. What am I missing?

if it doesn't fit, make it fit.

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05-31-2018 04:13 AM  83 days agoPost 2
Heli143

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Phenix City, Alabama

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I may be way off but What’s your headspeed?

Roy Mayoral

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05-31-2018 02:52 PM  82 days agoPost 3
Daves

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Tallahassee, Florida

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Hey Motorrc.

I hope you find the problem. The e550 is a great heli, but too small for my eyes. If you discover a need for parts, I've got a complete e550 (minus FBL controller and receiver) with a few spare parts that I'd be willing to sell.

Just PM me if interested.
Dave Sellars
Tallahassee, FL
Team Futaba
Team Castle
daves@tallymove.com

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05-31-2018 03:19 PM  82 days agoPost 4
JuanRodriguez

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The Villages, Florida

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Heli143
I may be way off but What’s your headspeed?
You may not be way off. A low head speed can cause what he describes.....

To OP, bump up the head speed a couple hundred RPM without doing anything else and see if the problem goes away....

Been there, done that and old enough to know better.....

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05-31-2018 03:26 PM  82 days agoPost 5
motorrc

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canton ohio usa

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I'll measure the headspeed and get back to you.

if it doesn't fit, make it fit.

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05-31-2018 03:37 PM  82 days agoPost 6
Jeff polisena

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westpalmbeachflorida usa

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Tight dampeners and low headspeed . Bump headspeed or try softer disc .look for any plastic parts flexing and any movement in servos when powered up .

I stole it ,flew it and gave it back ;)

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05-31-2018 03:38 PM  82 days agoPost 7
rcscaleguy

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CA, USA

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If that doesn't help, I have a brand new 140° swashplate to change up the head and mixing a bit. Should help distribute the load.

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06-01-2018 11:29 AM  81 days agoPost 8
Richardmid1

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Leeds, England

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Check C of G aswell.

60% of the time, it works every time!

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06-01-2018 03:56 PM  81 days agoPost 9
motorrc

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canton ohio usa

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CG is perfect

if it doesn't fit, make it fit.

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06-03-2018 04:38 PM  79 days agoPost 10
artimus

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Buckley WA

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Describe the proposing your having. If it the tail bobbing up and down or is it climbing and then decending as you go in forward flight. Low head speed will cause the bobbing tail.
Might switch out blades to and see if that changes an thing

Fly Hard......Team Viagra

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06-04-2018 03:08 PM  78 days agoPost 11
motorrc

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canton ohio usa

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The heli hovers fine and in slow to medium forward flight is fine. On fast forward flight the tail bobs up and down. I switched out the blades from another e550 that does not porpoise and it did not help-porpoising still present so I'm certain the blades are not the issue.

if it doesn't fit, make it fit.

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06-04-2018 03:12 PM  78 days agoPost 12
JuanRodriguez

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The Villages, Florida

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Did you try increasing the head speed as has been suggested? Maybe you did and I missed it....

Been there, done that and old enough to know better.....

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06-04-2018 03:26 PM  78 days agoPost 13
motorrc

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canton ohio usa

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I didn't forget to try that Juan, I have not had a chance to get out to the flying field to try that. I'm planning to try that in a day or two and will report results here. I'm planning to measure the head speed before I increase it but I can tell you it does not look any slower to me than the e550 I have that does not porpoise.

if it doesn't fit, make it fit.

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06-04-2018 03:39 PM  78 days agoPost 14
JuanRodriguez

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The Villages, Florida

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Oh, ok... I see that you switched out the blades with no relief......

All I can tell you is that I had a heli with the exact same symptoms and bumping up the head speed resolved the issue....

That is the easiest thing to do and you don't have to swap anything to try it...IMO, no need to tach your head speed to try this suggestion..... but again, it's just my opinion......(and several others as well)

Been there, done that and old enough to know better.....

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06-05-2018 05:18 AM  78 days agoPost 15
rcscaleguy

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CA, USA

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Well without installing a new FLB controller you could find a set of heavier blades to reduce the pitch tendency of light rotor blades. So if you're into hard 3D then this may not be your optimum path but if you are more into smooth flight heavier blades should smooth out the pitch issue. Also, makes autos super easy!

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06-08-2018 02:43 AM  75 days agoPost 16
motorrc

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canton ohio usa

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follow up
Well I finally made it to the flying field with my buddy who took the optical tach readings. Initially, the heli was running at 2100. I gradually increased the head speed until it was 100 percent across the board and headspeed was 2900. Porpoising continued even at 2900 which is max unless I change the pinion gear. The porpoising was slightly better but still very unacceptable. Someone thought it might be the servos, however I have hitec 5645mg on the cyclic on this heli as well as another e550 that does not porpoise and so I doubt that is the problem. For heavier blades, Rcscaleguy do you have any specific suggestions? I read somewhere its not safe to use woodies on these helicopters.

if it doesn't fit, make it fit.

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06-08-2018 01:46 PM  74 days agoPost 17
Richardmid1

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Leeds, England

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Are the head dampeners worn and loose? Can you rock the blade grips like a see-saw motion with your hands?

Are you running those servos on the same voltage on both helis? They are quite slow servos for FBL if run on 5v.

Also try reducing dial 2 (direct cyclic feed forward)...

"Direct Cyclic Feed Forward Too High = This causes over-control in your cyclic input. When set too high, the control loop overshoots and needs a steer back correction. This causes pitch backs (bobbles) on cyclic stops and imprecise fast forward flight."

60% of the time, it works every time!

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06-09-2018 01:19 AM  74 days agoPost 18
motorrc

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canton ohio usa

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both helis are running 6V BEC. The porpoising heli's head is actually tighter,ie, less see sawing the then the good heli. I'll play with dial number 2 again and see if any progress is made.

if it doesn't fit, make it fit.

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06-09-2018 03:22 AM  74 days agoPost 19
rcscaleguy

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CA, USA

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Have you tried swapping heads. Then you’ll know if it’s the head or electronics. Couple of links to pop and a bolt on main shaft. Then you can isolate your problem.

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06-30-2018 01:41 PM  52 days agoPost 20
Evolusia

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UK

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Hi, just came across this post whist looking for something else but I have to ask, 2900 rpm on an e550? This heli has 550mm blades!

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HomeAircraftHelicopterMain Discussion › thunder tiger e550 and ar7200 porpoising
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