Idea for you, a BRUSHLESS motor is more expencive, but an all around better
motor to pick for heli uses. Brushes wear out and get poor preformance,
espesially if you are running them at high speeds. If your heart/pocketbook
is set a brushed motor, try to run it at lower rpm's. I think jeti brand
products are faily good, with the little experiance ive had with them, and
have herd a sucsess story or two with the brushless motors from them in use
But make absolutly sure you get one without that low volt cutoff crap, i
know you already asked that, but just to reiterate it. A small helicopter
pretty high in the air, with no warning of power loss, usually equals a
crater in the ground; unless of corse you practice alot of autos with that
eco when you first get it.
Of corse you know thers always a reason, If the motor keeps running the
battery down (you should notice it signifigantly beforehand) then eventually
the battery will die out. Your reciever wont work to well without power.
Unless you plan to get a a setup with a seperate 4.8v battery for your
reciever, whitch adds weight and decreases flying time a bit, but secures
> > I have purchased an eco 8, and I have a few questions for you all.
> > I plan to run 8-10 (maybe up to 12) sanyo 2400 scr cells, and I want
> > to know what esc (for brushed) can handle this and also handle more
> > cells if I later decide to go to a hotter motor/more cells?
> > Jeti 30he is 8-10 cells (decent)
> > Novak arrow is 6-8 cells (poor) and 1.5A bec ( a little low)
> > I need one that is maybe 8-12 cells with around 3A bec, and no motor
> > cutoff at low voltage. Also a switching freq. of at least 1kHz.
> > What esc would you choose??
> The Jeti is a good controller. I've used one on 10 cells and 4 servos
> in an Eco-8. No problems.
> Another one to consider would be a Castle Creations Pegasus-35H. It is
> also rated to 10 cells BEC (or 18 w/ no BEC use). 2800Hz freq
> Note: it will be very hard to find an ESC officially rated for 12
> cells AND BEC operation. You run the danger of overloading the BEC and
> shutdown (maybe even crash!) past 10 cells. Flyer beware.
> An Eco-8 on 10 cells is quite aerobatic. Plus, 12 cells on a brushed
> motor may be pushing it too far.
> > Question 2,
> > What car motors can be run in reverse.
> > MMayhem reverse is 22X1 with bushings. Maybe decent with bearings,
> > but it does at least have an oversize armature.
> The MM is pretty good for basic flying (hovering, forward flight,
> simple loops) and endurance, but don't try to push it too hard. Adding
> bearings is cheap and easy (I've done it to two of them).
> > Trinity speed gems?? I am unsure how low I can go on the windings and
> > still get decent duration. I was planning on increasing from 8 cells
> > until I find the power/duration I like. It sounds like 10 cells keeps
> > most folks smiling.
> Trinity 19T is said to be quite good. A better choice for aerobatics,
> but not a duration motor like the MM. A 19 turn motor is about as low
> as you'd want to go with the Eco as it has only single-stage gearing
> and lower turn motors have less torque.
> I've run 6, 7, 8, & 10 cells on the Eco. 10 cells is definately the
> best. 8 is ok too, but less power.
> > What pinions (sizes, pitch, and manufacturers) do you reccomend for
> > these motors?
> For both motors, 10 - 12 tooth is good. They are a metric pitch close
> to 48 pitch. You can use a 48 R/C Car pinion in a crunch, but it will
> be noisy and not as efficient as the ones from Ikarus. Start with the
> 10 tooth that comes in the kit first.
> Stop by the E-zone (www.ezone.com), the electric heli forum is a great
> place to look around.
> F. Walker