[chevelledude13]

I just bought an RDT Edge 540T from Racing Devil Hobbies in Vancouver. The 82" wingspan plane requires hi-torque servos. Would my JR 537's be sufficient? I've been thinking I would get Hitec servo's if I need something more powerful, so which Hitec's would be best suited? I'm going to use pull-pull wires for the rudder. How many mA's should my battery pack be? Does anyone have any experience with this ARF? I think this is the same as the Edge 540 sold by RCGuys.com. This is my first big aerobatic plane so I could use some advice. Thanks.

[hillmanr2]

what kind of flying are you going to be doing with this plane? DO NOT use standard 537 servos on a plane of this size except for the throttle. Even if you are just a sport flyer I would run at least 80 oz/in servos in the control surfaces. This is also a safety issue. 17 lb plane hitting something/ someone at 50 km/h = ugly mess.

[David_Moen]

I am in the process of putting together a 84" Edge 540 form BME Aircraft. After much consideration I decided to go with Hitec 5945MG servos on all surfaces except the rudder where I installed a 5955TG. No questions about adequate servo power!

[Sparhawk]

Minimum's
Ailerons - 645MG
Elevators - 5645MG
Rudder - 5955TG or JR8611A class
Throttle - 537 is ok
Choke (if gasser) - HS81MG

That's what I have in my BME 30% Edge w/ DA50

Spar

[chevelledude13]

How many mA's should my battery pack have for these servo's? Should I consider going to a 6 volt pack?

[David_Moen]

You are going to get lots of advice on batteries! I would suggest a 6 volt pack for sure. I'm going for simplicity and light weight on mine...1 2100ma, low impedance 5 cell NiMH pack on the RX and a 4.8V version on the ignition. Use good quality switches and fail-safe all your connections by either taping together any servo extension connectors, or eliminating them all together by soldering extensions in.

[Ramz-to-tha-Z]

Whatever your setup may be, make sure you either go with high quality switches or go with 2 switches for the rx and 2 for the ignition. I've seen too many and heard of too many planes going in because of a bad switch. I'm running 4 JR heavy duty switches on my 35% Extra. I'm also running 6V, NiMH, 2000mah batteries....2 on the RX and 2 on the receiver. I'm also running a seperate battery for the smoke pump. It's gonna add a bit of weight but i'd rather sacrafice some weight for reliability.

[Ramz-to-tha-Z]

Originally Posted by David_Moen

Use good quality switches and fail-safe all your connections by either taping together any servo extension connectors, or eliminating them all together by soldering extensions in.

If it were me, i wouldn't solder the connections as solder joints are more apt to fail over time and they're a #$%# to take apart!! What i do is use heat shrink tubing and shrink the tubing over connector. This way, they will never pull out. Tape would work too but i prefer tubing....makes for a cleaner install.

[scaleguy]

Originally Posted by Ramz-to-tha-Z

If it were me, i wouldn't solder the connections as solder joints are more apt to fail over time and they're a #$%# to take apart!! What i do is use heat shrink tubing and shrink the tubing over connector. This way, they will never pull out. Tape would work too but i prefer tubing....makes for a cleaner install.

What I think Dave meant is that he cuts the servo lead, keeping the fatory connector, and solders the length of wire he needs in between.

There was a thread last year on this.

[chevelledude13]

Thanks for all the great advice so far. I just got the plane today and it is HUGE! I can now see that the regular servo's would be far too small. How do you wire up more than one switch? Do you run them in parallel, or something like that? Also, I bought a used Moki 2.1 for this plane, and I don't know what size prop to start with...any suggestions? How big a fuel tank will I need for this thirsty beast?