It’s a CORE radio that has ability to use Multiplex M-LINK 2.4 protocol on top there own 2.4 system. It be like a Futaba transmitter having ability to also use a Spectrum RX.

Originally Posted by felker14

It’s a CORE radio that has ability to use Multiplex M-LINK 2.4 protocol on top there own 2.4 system. It be like a Futaba transmitter having ability to also use a Spectrum RX.

Very interesting.

Would Promodeler DS470BLHV servos be okay for this plane? I have these servos already.

Should work great, as long as you're not using a Powersafe Rx.

Originally Posted by Lardog

Should work great, as long as you're not using a Powersafe Rx.

using 1 Futaba R7014SB RX with duel power input.

Originally Posted by Lardog

Should work great, as long as you're not using a Powersafe Rx.

Why is that?

Originally Posted by NashVegas

Why is that?

Yes, why do you say that? I'd like to know too.


EDIT - I did a search for Promodeler and Powersafe and found this explanation in a post from Promodeler:

"Spektrum PowerSafe receivers send an uncontrolled voltage spike through the signal pin. This puts servos at risk of sudden failure when zapped with 10V. Internal and external solutions exist to resolve the issue. New ProModeler servos are protected against this, and we step up to the plate and warranty any you already have."

See post 249 for the complete explanation

https://www.flyinggiants.com/forums/...fe#post2801397

^^
That explanation keeps getting repeated but it’s just not possible. Spectrum receivers do not put any voltage spike on the SIGNAL pin. If they did they would fry EVERY brand of servo, and the forums would be going $(*#$ (*$*(#


What is happening is that PM servos are generating back EMF from the motor on the power bus (the red + lead) . Normally this back current gets absorbed by the system battery, however the Spectrum powersafe has a diode preventing back current. It has nowhere to go so power bus voltage spikes.

This is the same scenario that Hitec makes their "PAD" capacitor for. ProModeller probably added internal buffering for this if they redesigned the servos to “fix” it.

Originally Posted by shorte

Would Promodeler DS470BLHV servos be okay for this plane? I have these servos already.

Have heard so many good things about these that I’m leaning towards putting them in mine, over the MKS 777, it’s a hard decision though. What are you guys running for throttle servos on a plane this size, if you go with promodeler? Although the MKS 1250 is actually somewhat affordable compared to the triple 7

Looking to put a RCGF 70 twin in my laser over the DLE 60 I have.
Will the RCGF fit in the cowl without cutting holes for the plugs and mufflers?
Will be using Promodeler DS470BLHV all around.
The Saito Fg61 twin looks interesting but might be under powered. and heavy.

777 is really not a great servo for a 91 inch airframe. They are tall and heavy. The PM are brushless so they’re more efficient.

Originally Posted by dmichael

Yes, why do you say that? I'd like to know too.


EDIT - I did a search for Promodeler and Powersafe and found this explanation in a post from Promodeler:

"Spektrum PowerSafe receivers send an uncontrolled voltage spike through the signal pin. This puts servos at risk of sudden failure when zapped with 10V. Internal and external solutions exist to resolve the issue. New ProModeler servos are protected against this, and we step up to the plate and warranty any you already have."

See post 249 for the complete explanation

https://www.flyinggiants.com/forums/...fe#post2801397

Been away for a while... that's good to hear.

I think I might go electric for the smoothness and clean install but I have a hard time with a 5 min flight time in this size plane and cost of batteries. It is good if you want all out 3d in 5 minutes . I don't fly like that. Wish I could. Too old now. LOL

DLE 60 is plenty of power for me. but need to modify the mufflers.

My amazing EF Laser 200 Exp 91 (5 min 52 sec)

I have a DLE 60 already.
Not sure what to use yet
In my 91 laser I am finding out the cowl needs cut for mufflers too
If I go with my DLE 60 that I already have I can get the mufflers welded like this guy did.

DLE 60 twin.
Here is my 1st muffler cut. Sanded on a flat sander. Now I need to find a good welder.

Originally Posted by jharkin

^^
That explanation keeps getting repeated but it’s just not possible. Spectrum receivers do not put any voltage spike on the SIGNAL pin. If they did they would fry EVERY brand of servo, and the forums would be going $(*#$ (*$*(#


What is happening is that PM servos are generating back EMF from the motor on the power bus (the red + lead) . Normally this back current gets absorbed by the system battery, however the Spectrum powersafe has a diode preventing back current. It has nowhere to go so power bus voltage spikes.

This is the same scenario that Hitec makes their "PAD" capacitor for. ProModeller probably added internal buffering for this if they redesigned the servos to “fix” it.

This is a very good explanation of what's happening. Every redundant power source to the Rx should have a buffer/diode to block reverse EMF because if one of the two sources fails, it will fail the second source and eliminate the advantage of the redundancy.

If you are not using a Powersafe and not buffering a dual voltage source to your Rx, there is risk. I also split the wires from the buffer when doing this to split the Amps load on the JR connectors to the non-Powersafe Rx like the attached image. The buffer is from Western Robotics.

Powersafe receivers are not the only component that blocks Reverse EMF. Most of the good heavy duty switches do too for the same reason.

With that said, I've used Powersafe exclusively in my plane from 50cc and up, gas and electric, and never has an issue with servo failures from voltage spikes. If this is a real issue with PM servos, then no thank you.