going brushless need some info

[txflyer]

ok so ive done some searching but havent found a dead on answer to my question. i am going to to go brushless soon. just bought a g90 gyro and a park 370 brushless motor. im going to get the eflite 20amp brushless esc. after reading the installation instructions i am left wondering, will my heli run in idle up mode for now on ? or can i still switch between idle up and normal flights ? i am no where near ready for even thinking of switching into idle up mode yet. but with my recent dual tall motor swap. my heli is getting heavy and want the extra power and run time.

thanks

also how does different pinion sizes affect heli's ?

if this is a repost plz delete.....

[Gino CP]

If you are using the stock transmitter, you want to match your motor's kv with a correct pinion so that you hover above midtsick. This way, your idle up transitions are smooth and hopefully seamless. A 4100kv motor will do well with 8T. If you want a bigger pinion , say a 10T or 11T, you need a programmable transmitter.

[txflyer]

ok so i need to get a 8t pinion. but i dont want to be stuck in idle up all the time. i really dont want idle up at all right now. i like being able to drop the stick if i have to crash and not worry about doing 3 other things. to keep from buring stuff up. so can i still switch between the 2 ? if not i need to return the brushless motor

[slikrx]

If you have the headspees matched (using Gino's recommendation) you will be able to go in & out of idle up without any problem.

The biggest thing to remember is that you want to be hovering when you change from one mode to the other.

[Gino CP]

That is correct. 8T is fine iin idle up off. Don't use the pinion that comes with the EFlite motor. They don't mesh well with the Blade main gear. You will need to borrow or buy a gear puller if you motor comes with a pinion.

[chopperdudes]

to answer ur question, u will still have normal mode.

[txflyer]

it comes with 2 pinions a 10t and 12t. so just any other type of 8t and assuming a 48 pitch pinion ?

[Gino CP]

You'd want an 8T 0.5modulus or 0.5M pinion gear.

[Anubis328]

The way you lose normal mode using brushless setups is if you use govenor mode on the ESC. The E-Flite 20A ESC does not even have this as an option, so no worries.

[txflyer]

thanks for all the info guys.

[carlo_the_wonder_frog]

I would use a 10 tooth pinion on there, the 8 tooth doesn't give high enough headspeed for anything other than FF. Higher HS will make the heli respond much better to inputs.

[Anubis328]

What setup are you running Carlo...

I've got a Phoenix 25, and the E-Flite 370 with a 1350mah 3 cell. I'm running an 8 tooth, and the head screams. I can fly the thing in almost any wind, and it rolls easier than my T-Rex SE, so 3D is no problem. The motor is hot after 4 minutes though. Did I do something strange with my setup?

[txflyer]

well damn i went out today and bought a 8t pinion.

i think my brushless setup is going to wait. im having issues with my new g90 gyro. that i cannot seem to get worked out. and i think its cuz the prop adjustment on the reciver is screwed up and i cant turn it down anymore then what it is.. but the tail stays put kinda, its the stupid heli drifitng. ive been off work all day and cannot seem to get this thing to fly str8. im about to sell it and strart gathering crap for a trex 450 se. i have checked pitch, and tracking. funny thing is i was hovering so good last night before i installed the gyro this mourning..

[slikrx]

well damn i went out today and bought a 8t pinion.

i think my brushless setup is going to wait. im having issues with my new g90 gyro. that i cannot seem to get worked out. and i think its cuz the prop adjustment on the reciver is screwed up and i cant turn it down anymore then what it is.. but the tail stays put kinda, its the stupid heli drifitng. ive been off work all day and cannot seem to get this thing to fly str8. im about to sell it and strart gathering crap for a trex 450 se. i have checked pitch, and tracking. funny thing is i was hovering so good last night before i installed the gyro this mourning..
One thing to remember is that you need to turn the proportional pot down as far as it will go (full counterclockwise) and that the knob on your transmitter should be about "2 o'clock". Roughly 50% to the right/positive side. (heading hold -HH mode)

this is the knob I'm talking about: (I made this for a different post, so it's not aligned right)
http://i48.photobucket.com/albums/f206/slikrx/gyrochannelpic.gif

[txflyer]

ya ive got everything set, i can notice a good improvment with the tail. its not as much of a pita to fly. i think one of my tail motors is already going out. i think my direct drive will be here tomorrow. oh and the problem i was having was blade tracking, i did a quick adjustment on them and it fixed most of the problem..thanks..

[Buzzkill]

Gino CP Posted: Mon Apr 02, 2007 10:30 pm Post subject:

--------------------------------------------------------------------------------

If you are using the stock transmitter, you want to match your motor's kv with a correct pinion so that you hover above midtsick. This way, your idle up transitions are smooth and hopefully seamless. A 4100kv motor will do well with 8T. If you want a bigger pinion , say a 10T or 11T, you need a programmable transmitter.


Quick question. What does head speed have to do with lift above middle stick? If your pitch is set to zero at mid stick it doesn't matter what head speed you have does it?

[Gino CP]

It has much to do if uncontrolled. Pitch curves are different for normal mode and idle up. With a stock transmitter and an oversized pinion, sure you can hover in normal mode. But because of higher head speed, you'd be hovering well below midstick. This is because, it takes less pitch for the heli to hover because of higher head speed.

The problem is, when you switch idle up on, the sub midstick position is now a powerful reverse pitch. Remember, you have zero pitch at midstick at idle up. You heli goes down quickly. In short, your idle up transitions will be very exciting!

With the correct pinion or a programmable tx, you can hover above mid stick in normal mode like a stocker. Idle up transitions blend and will be uneventful.

[Buzzkill]

Thank you for the information.