EF Extra 300 104"

[amstd7]

I have a Spektrum AR9020 which has an operating voltage of up to 9.0v.
I am planning on using a Smart Fly power expander with 2 li-ion packs.

Can you use HV Servos with this setup,
and if so are there any specifics that I need to know about?

Appreciate any help, Thanks

 

[cardenflyer]

Why use an expander? Keep it simple, batteries to rx, program all servos in radio.

 

[gyro]

Why use an expander? Keep it simple, batteries to rx, program all servos in radio.

Maybe since it's not one of the power safe receivers, he wanted a way to get battery sharing/redundancy. I would have done the same, but I'm using an AR9120 DSMX powersafe receiver.

With a 9 channel rx, there also isn't enough open ports to plug the 2-3 jr plugs in to carry power into the rx.

 

[cardenflyer]

I guess I've been doing Jr 921 on 40% cardens with just regulators, it's redundant, 2 switches, 2 batteries. Never lost a plane ever on electronics.

 

[kevinjulieevan]

if you are not using a power safe receiver and don't want to use a smart fly power expander. i think you can use a wolverine switch. i think this is the way our used 104 is set up. here is a link if you want to read about this option.
http://www.fromeco.org/products/04frcwo-430b/
kt

 

[amstd7]

Thanks Kevin for the info, still undecided on the power system,
I guess true redundancy is one of my main concerns.
On your 104, how is the ignition
system set up? Thanks Again

 

[gyro]

Got some build progress done today.
Many thanks to [MENTION=413]Brian Yak Dude[/MENTION] for coming by and helping out with the cool tape idea and getting some work down on the 104!




All hinges except removable rudder are now done!

 

[kevinjulieevan]

our ignition has it's own battery run through a sparkswitch which can be turned on or off with the transmitter. they work great but i have also used an ibec to avoid the extra battery also. either would probably be fine.
here is a link to the sparkswitch device
http://www.powerbox-systems.com/en/produkte/zubehoer/schalten-und-regeln/sparkswitch.html
and here is a link to the ibec i've used in the past
http://www.tech-aero.net/ultra-ibec
personally i like the ibec best because it's one less battery to worry about but if your ibec fails.......

 

[amstd7]

I appreciate all the good info and the links I'm sure with all of this I will be able to make a decision on which way to go.

Thanks Kevin

 

[gyro]

Well, one wings hinges got messed up. Some how, (I suspect I didn't do good enough Vaseline application) about 4 hinges got epoxy in them and wouldn't bend... Luckily the other wing and both elevators came out fine.

So I spent a fair amount of time last night with the soldering iron and drill, and removed what I could of the old hinges, and drilled out the holes.

I got the aileron rehinged last night, and I'll attach it to the wing this morning.

Big bummer overall, but I think I'll be able to hide the damage with some ultracote hinge sealing.