IVO Problem

[jrevens]

Thank you Lowell & Dan... you're absolutely right of course, & thanks for correcting me. That'll teach me to use my keyboard before engaging my brain! The situation still seems rather odd however - it would seem to be very unusual that the wire size & length would be so critical. The wire size & length would usually be selected as to not create any appreciable voltage drop to a device like a motor. I guess that IVO may be limiting the voltage to something less than battery voltage with this wire. It's interesting.

[Slyfox]

here's a thought for ya. Just remove the spinner and pull the wires out for the motor, apply 12 volts and see what happens. If it still has a problem than send the motor to IVO. When you get it back and fly again take and only adjust the prop after pulling power off momentarly for prop changes, I bet your motor last longer.

[DanB]

[quote=jrevens;18990]

The situation still seems rather odd however - it would seem to be very unusual that the wire size & length would be so critical. The wire size & length would usually be selected as to not create any appreciable voltage drop to a device like a motor. I guess that IVO may be limiting the voltage to something less than battery voltage with this wire. It's interesting.

John, I agree with your statement of wire length not being so critical.
I have not seen the IVO instructions indicating that the wire should be left coiled up...but my hunch is that it would not be for maintaining the resistance. That would be somewhat of a goofy way to design a circuit (that's why god made resistors)

As an example, using 10 AWG would take about 1000' to generate only 1 Ohm. I'm betting the wire in the kit is in the ball park of 20 AWG which would be close to needing 2000' to cough up 1 ohm. I don't buy the wire length being a factor. My guess is a short somewhere. if not external then internal which leads back to IVO's request to send it in for repair.

[Slyfox]

wire length and the use of their circuit braker makes it so you don't damage the motor(so to say). I had this conversation with the guy at IVO. Also you better use their rubber washer inside where the cam stops on both ends, this will also blow the gears. My cure is to watch how it hits the ends and keeps running, will kill the gears, I never wait for the circuit braker to trip. I count and most reciently I use rpm to know where to set for landing. Mine is pull off power to about 4400 and than fine pitch to about 5200 and I am set, usually a count of 3 when doing this. I don't have my prop fixed for a stop for fine pitch it can go beyond that, why, I want my gears to last.

[kmach]

Hi,
The Ivo wire is 16 gauge and all lengths are 12' ,except between the two way switch to breaker is 6". I coiled and mounted excess wire under the panel out of the way. preliminary ground test( not running ) everything works with no breaker tripping. I hope to try ground runups this weekend.

[kitfox2009]

Hi Keven
Good luck with it. I bet you never want to go back to a ground adjustable again!
Cheers
Don

[DAT]

I hope I'm not jumping the thread. What paper work is necessary for the installation of the IVO IFA prop? Does the plane have to be re-certified or just make a logbook entry?

Thanks

DAT

[av8rps]

Hi,
The Ivo wire is 16 gauge and all lengths are 12' ,except between the two way switch to breaker is 6". I coiled and mounted excess wire under the panel out of the way. preliminary ground test( not running ) everything works with no breaker tripping. I hope to try ground runups this weekend.

It is very interesting to read how many IVO IFA guys will experience not having the breaker trip, when mine trips quite easily. And fwiw, I like it tripping easily as then I know it is at the end of its limits and voltage isn't trying to torque the motor when it is already done. I have had great luck with my IVO IFA now for more than 400 hours without any mechanical failures, so maybe that breaker tripping is removing a lot of stress from the motor and gears?

And while I think it is a good idea to follow IVO's instructions regarding the limit washers and wire lengths, I do not believe those washers will do much of anything to cushion the overtorquing that occurs when the motor is at the end of its limits or range, but the power is still applied to the motor. I'd rather see the breaker blow early so you aren't overstressing the motor and gears.

Anyhow, I thought I would share with the group how mine operates since I've had really good luck with it.