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e-Electric Conversions > e-conversions?
 
 
Pipeous
Veteran
Location: Surrey, BC, Canada

Thanks Rob
A valuable lesson learned. I understand now, I will do some sizing up, will search the site some more and see. If not a slight alteration would be easy enough. Make my own if need be I guess.

One last question. Is there a brushed motor that is a 600 size? I have a controller for planes that can just add fets for amperage, just considering options. I could afford the lipolys first and probably a brushed motor, then move to brushelss next.

I was talking today to the guy that got me into helis, he makes electronics so the idea came up. I got a couple fairly large planes today as well from him. And I got real flight g2 baby, I lost my 5th scale to get them but...the air compressor will come in handy too lmao (Bi plane is an os61 powered beast)
09-29-2003 Over year old.
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rscamp
Veteran
Location: Ontario, Canada

Pipeous

Sure there are brushed motors that are "600 size". Did you happen to read my article on Starting Out with an Electric Helicopter? It has some advice regarding brushed motors.

In short, go brushless!

Rob
09-29-2003 Over year old.
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Pipeous
Veteran
Location: Surrey, BC, Canada

Something about a brick? Nope that was a different article haha
09-29-2003 Over year old.
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KC
Elite Veteran
Location: WA

ok interesting stuff, I want to convert a hirobo vertol, theyre 9.6:1, about 10 pounds, any suggestions to how you guys would do it?
09-29-2003 Over year old.
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rscamp
Veteran
Location: Ontario, Canada

KC.

Don't know anything about the Hirobo Vertol, but the size of a NiCd or NiMH power source when converting to electric would go something like this:

30-size heli - 16-22 cells
50-size heli - 20-26 cells
60-size heli - 28-32 cells

The torque pulse and unresolved unbalance forces from a single cylinder IC engine causes tremendous vibration in the airframe. Material can be removed (from the right places) when converting to electric.

Despite the efficiency of a good electric power system (about 80% vs. about 20% for an IC engine) the energy stored in the batteries is so much less than in fuel that obtaining minimum weight and good aerodynamic efficiency makes a big difference. This is why electric airplanes make widespread use large propellers and gearboxes. The improvement in aerodynamic efficiency is huge and combined with low airframe weight gives an airplane like an E3D its vertical performance.

A bigger wing helps carry the heavy batteries. In general, you are probably better off converting a 50 size heli than a 30 size, especially if you try to keep the weight down. I have always thought that taking a 30-size heli, and fitting a long tail boom and 600mm blades effectively giving a 50 size "wing" would be a good approach.

Rob
09-29-2003 Over year old.
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Pipeous
Veteran
Location: Surrey, BC, Canada

As I add up all the required components, I am thinking it would be cheaper to get a new motor and gyro and keep it a nitro. Holy smokes it adds up fast.
I am just trying to justify what the savings will be in fuel to electricity to make some sense of it. I think I would have to sell some stuff of to do this.
09-30-2003 Over year old.
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rscamp
Veteran
Location: Ontario, Canada

I hear ya.

Fuel costs are high too, but I agree the initial outlay for electric is scary - especially if you aren't already an electric flyer. It would cost me a buck or two to get into nitro but not as much as for you going the other way.

I doubt if anyone uses electric power to save money unless they like the Speed 400 stuff which is very inexpensive. Electric is much more practical in smaller aircraft and the only way to go for indoors, but I fly bigger stuff so for me, it is just a preference. I understand the benefits and drawbacks of each. I find electric power systems more interesting and I prefer their regimen of use. It isn't for everyone, at least not at the current state of the technology. But if you like to be a bit different, are comfortable with technology, need something quieter to fly, find the noise or exhaust bothersome, or just enjoy tinkering with electrons more than engines, electric is cool.

Rob
09-30-2003 Over year old.
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e-Electric Conversions > e-conversions?
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