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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › thunder tiger e550 and ar7200 porpoising
06-30-2018 04:05 PM  36 months ago
motorrc

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canton ohio usa

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I don't run them at the speed routinely, that was just for testing purposes.if it doesn't fit, make it fit but don't force it.
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06-30-2018 04:39 PM  36 months ago
Evolusia

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Wow, I would like to have seen that, preferably through field glasses at several hundred paces.
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06-30-2018 09:18 PM  36 months ago
motorrc

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yes, it definitely flew like a different helicopter, but still porpoised!if it doesn't fit, make it fit but don't force it.
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06-30-2018 09:19 PM  36 months ago
motorrc

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ps these were carbon fiber blades, not woodies.if it doesn't fit, make it fit but don't force it.
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09-04-2018 04:59 PM  34 months ago
motorrc

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rcscaleguy 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.
I finally got around to substituting heads on the e550. It started with the standard thundertiger FBL head and I substituted a brand new garret head-no change still porpoising. Now I think it might be the servos-I am running hitec 5645mg on the cyclic and I have these on another e550 and it doesn't porpoise so I'm having a little trouble believing it indeed is the servos but can't think of anything else. I am presently running at 5.7V and am thinking of pushing to 6.0v to get better performance on the hitec servos. I have a futaba bls251 on the tail so I would not want to go any higher on the operating voltage. Any thoughts by anyone appreciated.
if it doesn't fit, make it fit but don't force it.
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09-04-2018 06:40 PM  34 months ago
motorrc

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ps The BEC on the talon 90 that I have installed as the ESC only allows 6.0V or 8.0V so I am at max unless a change out the futaba BLS 251.if it doesn't fit, make it fit but don't force it.
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09-26-2018 10:50 AM  33 months ago
dialarotor

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Traverse City, Michigan

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Change out the boom. I have been flying 3 E550's for 3 years. Last winter I folded a boom in half in flight, quite an explosion of parts in air. The boom might be getting soft at the boom support clamp. Never had anything like that happen in 30 years of heli flying and 10 years of flying raptor 50's with similar but longer boom. Undo the boom support and look for a wear line.RapRexSynLogo Pilot
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09-26-2018 12:49 PM  33 months ago
Evolusia

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Hi I've got an E550 which is completely original with the GT5 as the controller and it tracks OK in FF but its recently started to bounce its tail in the hover. I've notice that the elevator servo has developed quite a bit of play in the arm and having tried all the usual remedies I strongly suspect that its the servo as well
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10-09-2018 02:38 AM  32 months ago
motorrc

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PROBLEM SOLVED-FINALLY
very long story short-changed out the hitec 5645mg cyclic servos for much more capable RJX FS-0521 HV servos- absolutely no porpoising. What befudled me for so long is I have another E550 with the same hitec servos that flies great. The answer to this was I had two different swash plate geometries, the one that flew ok with the hitec servos had the older style 90 degree swash and the one that had trouble had a 140 degree swash which has a higher moment arm and therefore needs stronger servos-seems simple now, only took 6 months to figure it out. Thanks to everyone who took the time to help me with this-much appreciated.
if it doesn't fit, make it fit but don't force it.
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10-09-2018 01:10 PM  32 months ago
Richardmid1

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Leeds, England

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A 140 swash actually puts less stress per servo than a 90 degree swash. Could this have been solved by using shorter servo arms? Did you have the blue light at 6 degrees cyclic in step J?60% of the time, it works every time!
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10-09-2018 01:18 PM  32 months ago
Richardmid1

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Leeds, England

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Are you using FBL blades?

Those Hitec servos have plenty of torque for a 550 but it is their speed that is lacking for a FBL heli. Possibly INCREASE the servo arm length could have helped. Bit late now though, glad you have it sorted, happy flying.
60% of the time, it works every time!
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10-09-2018 02:33 PM  32 months ago
motorrc

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Richardmid1 A 140 swash actually puts less stress per servo than a 90 degree swash.
yes you are right about that. Oh well, back to the drawing board about why the why the hitecs did not work. Yes the status light was blue in step J.
Richardmid1 Are you using FBL blades?
I don't think the blades were the problem since I switched them and it didn't make any difference. BTW I'm a little fuzzy on the difference between FB and FBL blades? Does is boil to FBL blades being heavier?
if it doesn't fit, make it fit but don't force it.
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10-09-2018 09:35 PM  32 months ago
JuanRodriguez

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The Villages, Florida

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I’m no expert but I think it has to do with the chordwide balance of the blades (not the lengthwise) ...Been there, done that and old enough to know better.....
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10-10-2018 02:35 PM  32 months ago
Richardmid1

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Leeds, England

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FBL blades tend to be heavier with the C of G further out towards the tip. Yes chord C of G can vary also. FBL blades help A LOT in stability, there is a big difference.60% of the time, it works every time!
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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › thunder tiger e550 and ar7200 porpoising
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