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skifreestyle · 02-20-2015, 01:27 AM

After reading a bunch oth the threads here, I installed some Corona 929mg's on my 300. After flying 2 flights the heli became a little erratic in the air. Usually it just the bad pilot but I landed and found most of the servo tabs had cracked/broken on one side or another. How do I go about fixing them and will that be strong enough for flight? Or do i have to buy another set of new servos and toss these?
Thanks for advice on my servo issues...

Mikej · 02-20-2015, 04:10 AM

I used those servos for a while on 450s. They quickly developed a lot of slop and were causing some Tarot fbl units a problem due to the amount of EMF they produced.

I stopped using them.

thruster · 02-20-2015, 10:53 AM

I have also noticed corona servos having cases made from horrible plastic that just falls apart like no other. On the other hand, DoubleCH has around 1000 flights on a set of three corona DS919mg. The internal components seem to be very durable.

Nelsonisms · 02-20-2015, 01:07 PM

Like just about everything in this hobby, you get what you pay for. If they're cheap, they're cheap for a reason.

I suppose you could try sawing the remaining tabs off flush and make some yourself out of sheet aluminum and epoxy them on. I know that's what some guys have been doing with the 180CFX. No guarantees...just an idea.

skifreestyle · 02-20-2015, 01:29 PM

Those tabs are the worst + the bump on them. I thought if doublech got so many flights on them they would be good enough for me.

Nelsonisms that's what I was thinking. Would you use JBWeld? I didn't think epoxy/jb weld would be strong enough.

DoubleCH · 02-20-2015, 01:40 PM

I'm still rocking my Corona 919MGs. Of course they aren't the quality or accuracy of the TGY-S306G-HV that I swapped out for but if you mount them good on the frame the plastic tabs shouldn't be a problem. Since I shim the rear servo tower, the servo mounting tabs aren't even asserted reactive force from the servo working hard so I can't see them ever breaking. For the elevator servo, if you cut the little nubs on the top side (hub side) and do whatever necessary to mount the servo in the frame tight, it should be a tight fit that again the mounting tabs won't be asserted much reactive force from the servo working hard. I even glued a CF piece to the bottom of the servo housing and the bottom part of the frame to use the servo as part of my frame stiffener and the plastic servo housing is still good.

DoubleCH · 02-20-2015, 01:49 PM

skifreestyle, I think I have some retired 918MP (plastic gear version of 919MG) somewhere that the housings are still good. If you pay me shipping I can send them USPS to you (I need to find them first).

EDIT: Oh just realized you have the 929 not 919/918. I'm not sure the housings are compatible.

skifreestyle · 02-23-2015, 12:08 AM

Thanks for the offer doublech. Don't know if they will fit. I'll try and make some tabs from thin aluminum and see how it goes. However I should probably just get some better ones than mess with these and have a failure in flight.

02-20-2015, 01:27 AM	#1 (permalink)
skifreestyle Registered Users Join Date: Mar 2011	Corona 929 servo tabs After reading a bunch oth the threads here, I installed some Corona 929mg's on my 300. After flying 2 flights the heli became a little erratic in the air. Usually it just the bad pilot but I landed and found most of the servo tabs had cracked/broken on one side or another. How do I go about fixing them and will that be strong enough for flight? Or do i have to buy another set of new servos and toss these? Thanks for advice on my servo issues...

02-20-2015, 01:07 PM	#4 (permalink)
Nelsonisms HF Support Join Date: Feb 2013	Like just about everything in this hobby, you get what you pay for. If they're cheap, they're cheap for a reason. I suppose you could try sawing the remaining tabs off flush and make some yourself out of sheet aluminum and epoxy them on. I know that's what some guys have been doing with the 180CFX. No guarantees...just an idea. __________________ Gaui X5F 6S (VBar), Lynx 450X-L 6S (Ikon), Lynx 300X-L 4S (Ikon), Blade 180CFX 3S (Ikon) Lumenier QAV400 4S (Vector), Lumenier QAV250 3S (Naze32/CleanFlight), CYE Stingray 500 4S (TG Multi) AMA Member, HCAM Member

02-20-2015, 01:40 PM	#6 (permalink)
DoubleCH Registered Users My HF Map location Join Date: Sep 2011	I'm still rocking my Corona 919MGs. Of course they aren't the quality or accuracy of the TGY-S306G-HV that I swapped out for but if you mount them good on the frame the plastic tabs shouldn't be a problem. Since I shim the rear servo tower, the servo mounting tabs aren't even asserted reactive force from the servo working hard so I can't see them ever breaking. For the elevator servo, if you cut the little nubs on the top side (hub side) and do whatever necessary to mount the servo in the frame tight, it should be a tight fit that again the mounting tabs won't be asserted much reactive force from the servo working hard. I even glued a CF piece to the bottom of the servo housing and the bottom part of the frame to use the servo as part of my frame stiffener and the plastic servo housing is still good. __________________ mCPx'es/130X/3D-foamie: ugly mods 300X: fast beater/trainer, Protos stretched: trainer but can also go fast FPV250 5.8G, nQx FPV, Oh also Trex 450DFC

02-20-2015, 01:49 PM	#7 (permalink)
DoubleCH Registered Users My HF Map location Join Date: Sep 2011	skifreestyle, I think I have some retired 918MP (plastic gear version of 919MG) somewhere that the housings are still good. If you pay me shipping I can send them USPS to you (I need to find them first). EDIT: Oh just realized you have the 929 not 919/918. I'm not sure the housings are compatible. __________________ mCPx'es/130X/3D-foamie: ugly mods 300X: fast beater/trainer, Protos stretched: trainer but can also go fast FPV250 5.8G, nQx FPV, Oh also Trex 450DFC

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02-20-2015, 04:10 AM	#2 (permalink)
Mikej Registered Users Join Date: Feb 2007 Location: England	I used those servos for a while on 450s. They quickly developed a lot of slop and were causing some Tarot fbl units a problem due to the amount of EMF they produced. I stopped using them.

02-20-2015, 10:53 AM	#3 (permalink)
thruster Registered Users Join Date: Jan 2014	I have also noticed corona servos having cases made from horrible plastic that just falls apart like no other. On the other hand, DoubleCH has around 1000 flights on a set of three corona DS919mg. The internal components seem to be very durable.

02-20-2015, 01:29 PM	#5 (permalink)
skifreestyle Registered Users Thread Starter Join Date: Mar 2011	Those tabs are the worst + the bump on them. I thought if doublech got so many flights on them they would be good enough for me. Nelsonisms that's what I was thinking. Would you use JBWeld? I didn't think epoxy/jb weld would be strong enough.

02-23-2015, 12:08 AM	#8 (permalink)
skifreestyle Registered Users Thread Starter Join Date: Mar 2011	Thanks for the offer doublech. Don't know if they will fit. I'll try and make some tabs from thin aluminum and see how it goes. However I should probably just get some better ones than mess with these and have a failure in flight.

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