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250 Class Electric Helicopters 250 Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.

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Old 05-15-2010, 07:45 AM   #1 (permalink)
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Join Date: Aug 2007
Location: Connecticut
Default futaba gy520 w/ s9253 servo

My problem is I used to fly this heli with a gy401 and the same tail servo as listed, and the heli flew great just sluggish cause of the power to weight ratio. So I installed a gy520 with the same tail servo and at the same time I installed the 3900kva scorpion motor. Now on a futaba 8fg radion my gain is at 10 (can't go higher w/out wag) when I pitch pump the tail blows out for a second then recovers. I've been through my mechanical set up millions of times for bind, I have the batman blades on, c/f push rod, the 1st gen weighted grips. Now the only thing I can think of with other gyros in the past I've nulled the system in rate mode before flying in HH mode. I didn't do this b/c the manual didn't say too, any thoughts?
T-Rex 250// T-Rex 450 v2// Hirobo Sceadu 50// T-Rex 500
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Old 05-15-2010, 12:03 PM   #2 (permalink)
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Join Date: Apr 2009
Location: Norway

I use the GY520 both in my Beam and the Trex 250. Iīve never been picky about setting up in rate mode first because itīs programed to know both endpoints individually. Maybe I could get slightly better performance if I did, but it have not been a show stopper for me.

Itīs quite common for the gyromount plate to be a bit loose. Check it and fit it with CA if yours is loose aswell. Same goes for the battery mounting tray.

I use the thin foam that came with the gyro to mount it.

Spool up on a lazy susan or similar and check that your heli truly is free of any vibrations.

Good luck.
MSH Protos, Gaui X5, Trex-250
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