Originally posted by Captain MoMo
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Official Freewing MiG-29 Fulcrum Twin 80mm Thread
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Originally posted by xviper View PostYIKES!
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As fast as it was I dont think it would have stalled, second flight on my mig with the original stock servos I did a loop too low, and was full up elevator to not hit the groud, worked out great for me, fortunately. haha. I do have the upgraded servos in mine, but still contemplating putting in something bigger, just for peace of mind. I flew mine on stock servos a bunch with no problems.
@1:40
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Originally posted by Captain MoMo View Post
Good question to ask for sure - but I think that flaps are not the root cause. The root cause is most likely the inability of the elevator servos to handle the extra load due to flaps down at high speed. If the servos are replaced with a more powerful and capable set you will probably not crash due to loss of elevator - you may crash still but due to some other issue 😉
You only have to fix one pilot.
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Originally posted by Captain MoMo View Post
My feelings exactly when it happened! But Mike caught the whole thing on his camera - I did not pull back on the elevator too much as it would have stalled for sure - let go on the pressure and after she stabilized slightly I pull up again and returned home. It was a few seconds of my life gone 😁
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Originally posted by JohnVH View PostAs fast as it was I dont think it would have stalled, second flight on my mig with the original stock servos I did a loop too low, and was full up elevator to not hit the groud, worked out great for me, fortunately. haha. I do have the upgraded servos in mine, but still contemplating putting in something bigger, just for peace of mind. I flew mine on stock servos a bunch with no problems.
@1:40
https://www.youtube.com/watch?v=oXjHzozH6bI&t
Yes, stock 23g servos should work on paper and it looks like many folks are doing ok with them - just some are having issues. I don't doubt anyone who has a problem with the stock 23g servos - its hard to have your trust in a servo that you know has failed on others and yourself before. My recommendation is to swap out servos to better ones and move on - this bird is simply fantastic for it to be a hangar queen.
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Originally posted by Captain MoMo View Post
That was close! LOL
Yes, stock 23g servos should work on paper and it looks like many folks are doing ok with them - just some are having issues. I don't doubt anyone who has a problem with the stock 23g servos - its hard to have your trust in a servo that you know has failed on others and yourself before. My recommendation is to swap out servos to better ones and move on - this bird is simply fantastic for it to be a hangar queen.
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Originally posted by leithalweapon View Post
Fixx the pilot not the plane. That way you won't fly any plane at high speed with the flaps down. It just isn't a good idea and is a bad habit for sure.
You only have to fix one pilot.
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Originally posted by xviper View PostIs video 1 and video 2 the same flight? I wasn't quite sure if I got the time stamp correct. I wanted to see at the same moment it lost ELE in video one, what it looked like from the onboard in video 2.
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Originally posted by JohnVH View Post
This was on the 18g or whatever the stock ones were. Ive been flying it, Im not afraid of it, I wonder how many were a radio problem and not a plane problem.
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I maidened +2 mine with the stock original servos but did put the pushrod (stock) on the inner hole.
From my poll 14 have answered 11 had the upgraded FW servos, 2 had the stock FW servos, 1 didn't say. I agree with those that say the upgrades are on the edge of good enough but I have to say that upgrading the pushrod is as important and flying with common sense (no high speed flap down flying) is essential. And last not being any more nose heavy than the cg line on the wing and even better 10-15mm behind it. Reflex also seems to be a good idea.
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Originally posted by Captain MoMo View Post
Xviper -that is exactly what I am concluding. Or perhaps some of the Freewing upgraded 23g servos are not meeting their specs (or are mixed up with 17g servos as they look the same with no markings) while others are just fine. I just flew two Migs - all built with the same mods except the servos. One had the Hitec D85MGs and the other the Promodeler DS100. The one with the Hitec servos at 5.1V performed fantastic and flew 8 flights of excruciating abuse (including full throttle with flaps) and survived. The one with the Promodeler DS100 servos almost crashed on flight no 2 - NO ELEVATOR ! The issue is the servo. The DS100 is a HV servo and operating it at 5.1V is on the lower end of the performance (speed and torque). I have the footage below FYI..
https://youtu.be/sxxQ47QejXs
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For comparison....exact drop in, but those with 6 ch radios will need a reverser. MKS doesn’t offer a reverse version. Source: MKS website
I bought these because 1) Drop in 2) 3.7 volt min operating spec to cover any voltage drop in the tail.
-GG
SKU MKS-HV69 Quantity in stock 91 item(s) available Dead Band 0.001ms (Default) Spline Size 6mm 25 Tooth Control System +Pulse Width Control Working Frequence 1520μs / 333Hz Operating Voltage 3.7 ~ 8.2 V DC Volts (for 2S ~ 1S LiPo) Operating Temperature Range -10 to + 60 Degree C Operating Speed (4.8V) 0.17 sec/60° degrees at no load Operating Speed (6V) 0.13 sec/60° degrees at no load Stall Torque (4.8V) 6.0 kg-cm / 83.3 oz-in Operating Speed (7.4V) 0.11 sec/60° degrees at no load Operating Speed (8.4V) 0.10 sec/60° degrees at no load Stall Torque (6V) 7.50 kg/cm (104.2 oz/in) Stall Torque (7.4V) 9.2 Kg/cm (127.8 oz/in) Stall Torque (8.4V) 10.2 Kg/cm (141.7 oz/in) Motor Type Coreless Motor Potentiometer Drive Direct Drive Bearing Type 2x Ball bearing Gear Type Metal Alloy Gear Dimensions 29 x 13 x 28.7 mm Weight 21 g
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Originally posted by GliderGuy View PostFor comparison....exact drop in, but those with 6 ch radios will need a reverser. MKS doesn’t offer a reverse version. Source: MKS website
I bought these because 1) Drop in 2) 3.7 volt min operating spec to cover any voltage drop in the tail.
-GG
SKU MKS-HV69 Quantity in stock 91 item(s) available Dead Band 0.001ms (Default) Spline Size 6mm 25 Tooth Control System +Pulse Width Control Working Frequence 1520μs / 333Hz Operating Voltage 3.7 ~ 8.2 V DC Volts (for 2S ~ 1S LiPo) Operating Temperature Range -10 to + 60 Degree C Operating Speed (4.8V) 0.17 sec/60° degrees at no load Operating Speed (6V) 0.13 sec/60° degrees at no load Stall Torque (4.8V) 6.0 kg-cm / 83.3 oz-in Operating Speed (7.4V) 0.11 sec/60° degrees at no load Operating Speed (8.4V) 0.10 sec/60° degrees at no load Stall Torque (6V) 7.50 kg/cm (104.2 oz/in) Stall Torque (7.4V) 9.2 Kg/cm (127.8 oz/in) Stall Torque (8.4V) 10.2 Kg/cm (141.7 oz/in) Motor Type Coreless Motor Potentiometer Drive Direct Drive Bearing Type 2x Ball bearing Gear Type Metal Alloy Gear Dimensions 29 x 13 x 28.7 mm Weight 21 g
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1) No gyro...so I don’t know
2) I had to reverse/re-wire one of the MRC-supplied upgrade servos. Both that they sent me were positive direction servos. I decided to not re-wire one of the HV69 servos. That’s some tight soldering spaces. I did it, but I wouldn’t say it was EASY due to the tight space.
I went with a Futaba SR-10 reverser and am happy with it. Happier than with the soldering I would have had to do again....and then loose sleep over.
Some advise against reversers....so, to each his own. I would not classify the SR-10 as a low quality solution. It has a lot of features not found on cheap solutions.
-GG
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