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CarbonXtreme . Midland Helicopters . HeliProz

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Gohbee Aviation Stinger 30-90 > Gohbee / TZ / Raptor 90 Heli with BME modified G90 Gas Engine
 
 
hootowl
Elite Veteran
Location: Garnet Valley, Pa.

How does this differ from all the Zenoa ignitions?

"Any man who says he is an American, but something else also, isn't an American at all.
03-16-2006 Over year old.
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avator
Veteran
Location: New Jersey

I also use Fromeco regulator, so far no issues. Beside suppling a constant regulated 5v to the gyro, the second output is adjustable so that you can run your servo's anywhere from 5 to 6 volts. Actually, I think it goes higher than 6v, but I don't remember how high, maybe 6.3v.

Also, as Harris stated, never power your ignition system from the same battery as your receiver. Doing this provides a direct path for interference from the ignition system to the receiver. I've used CH electronics ignition systems for years in war birds, they work well. I've never had any interference issues when they were installed properly.
03-16-2006 Over year old.
 
 
hootowl
Elite Veteran
Location: Garnet Valley, Pa.

Ahh I see... no magneto.

How do these new ignitions set timing? Is there a trip circuit or sensor?

"Any man who says he is an American, but something else also, isn't an American at all.
03-16-2006 Over year old.
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AnnihilaT
Key Veteran
Location: The Netherlands Force: The Dark Side

edit: innacurate information





A day without sunshine is like, well, night.
03-16-2006 Over year old.
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hootowl
Elite Veteran
Location: Garnet Valley, Pa.

Stator? Stators are Stat.....ionary... Rotors turn. You must mean the crankshaft or flywheel.

"Any man who says he is an American, but something else also, isn't an American at all.
03-16-2006 Over year old.
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Franconia2
Heliman
Location: Shrewsury, MA

BME uses a magnet on a modified prop hub and a pickup mounted to the engine. The heli fan hub is mounted directly to the prop hub. This is a fixed timing engine but the timing is adjustable by loosening a couple of set screws and moving the prop hub.
Dave
03-16-2006 Over year old.
 
 
AceBird
Elite Veteran
Location: Utica, NY USA

Quote 
This is a fixed timing engine but the timing is adjustable by loosening a couple of set screws and moving the prop hub.


Like many engine manufacturers in the hobby industry their expertise is centered around the mechanics with very little sophistication when it comes to the electronics. Once you have the electronic ignition hardware mounted on the engine it stands to reason that you should have variable timing (advance timing as RPM increases). If an engine manufacture like BME, or Zenoah would marry up with an electronics firm or contract their services they could take the timing issue one step further. Then you would have a really awesome engine for R/C.

Ace

Ace
What could be more fun?
03-16-2006 Over year old.
 
 
AceBird
Elite Veteran
Location: Utica, NY USA

Quote 
Something else you should be aware of is that most regulators in the market are of the switching type, which means that the voltage they produce is contaminated with lots of high frequency (20-30 KHz) noise.
Harris


This is precisely why I carry two receiver batteries on my heli. One is being charged while the other is in use. They are isolated from each other by a form C switch. My heli is very tail heavy so the extra battery up front helps to balance things out. With all due respects to Raja and his jewel, I can’t help believing that there is not enormous noise generated by the AXI motor that gets through his regulator. I could be wrong because I do not know the details of his design and I have no instrumentation to prove or disprove it. But I do know that how the wiring is done for electric powered aircraft is a primary concern with these out-runner motors.

One other thing I would like to mention about interference, I discovered how powerful the magneto is on the 231 Zenoah by observing hardware that stuck to the outside of the housing. Aluminum being non ferrous, a magnetic field will pass right through it. This means you should avoid any wiring down next to the flywheel to prevent an induced currant from the moving magnetic field. The antenna wire comes to mind.

Ace

Ace
What could be more fun?
03-16-2006 Over year old.
 
 
Harris
Senior Heliman
Location: A Greek in Cyprus

hootowl,

Some time ago Model Avionics were advertising on their website a spread spectrum system that was promising exactly that. However, they never brought it to the market. I suspect they found out that RC models are a bit different from computer wireless networks. In wireless LAN's the system allows redundancy by simply resending packets of information at different frequencies. This is ok in networking, but imagine what would happen if your spread spectrum transmitter decided to re-negotiate its connection with your receiver while hovering your heli inverted half a meter from the ground! RC models require very tight real-time control otherwise the results can be entertaining for those watching from a safe distance...

Anni, why would you need a regulator for your ignition? I thought you could run it at 3-8.5 V without a problem.

Harris
03-16-2006 Over year old.
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AnnihilaT
Key Veteran
Location: The Netherlands Force: The Dark Side

Harris,

That could very well be. I will need to check the ignition manual again and if i dont need to reduce the voltage then i will just be running the lipo straight to it with a switch or something between. Havent gotten to the wiring yet. That will come after the mounting of the engine. 1 thing at a time for me





A day without sunshine is like, well, night.
03-16-2006 Over year old.
HOMEPAGE  
 
 
hootowl
Elite Veteran
Location: Garnet Valley, Pa.

Harris,

Horizon Hobbies claims to have solved the problem with a dual reciever Spread Spectrum DX6 System.

"Any man who says he is an American, but something else also, isn't an American at all.
03-16-2006 Over year old.
HOMEPAGE  
 
 
FLYINFOOL
Veteran
Location: Cudahy, WI

Quote 
This is a fixed timing engine but the timing is adjustable by loosening a couple of set screws and moving the prop hub.


From the pics it looks like the BME is using the CH ignition module.
That ignition has an electronic advance built in.
The timing that you are adjusting is to tell the ignition module where Top Dead Center is and the ignition will take care of the timing advance, based on rpm.


Jeff Borowski
Gohbee Field Rep
0133TD
03-16-2006 Over year old.
HOMEPAGE  
 
 
avator
Veteran
Location: New Jersey

As info,

Not all CH ignition systems have electronic timing advance. It is a $40 option. It is called Syncro Spark and can be added to any of the systems they sell.

http://www.ch-ignitions.com/
03-16-2006 Over year old.
 
 
FLYINFOOL
Veteran
Location: Cudahy, WI

I wasn't aware that it could be separate.
Do you know if the ignition that comes with the BME has the CTC (Computer Timing Control) in it?


Jeff Borowski
Gohbee Field Rep
0133TD
03-16-2006 Over year old.
HOMEPAGE  
 
 
Harris
Senior Heliman
Location: A Greek in Cyprus

Quote 
Harris,

Horizon Hobbies claims to have solved the problem with a dual reciever Spread Spectrum DX6 System.


Sorry, but I will believe it only when I see it!

Harris
03-16-2006 Over year old.
HOMEPAGE  
 
 
Harris
Senior Heliman
Location: A Greek in Cyprus

Anni,

CH Ignitions state on their web site that their ignitions can run from a 4 or 5 cell NiCd or "from a Duralite" (I assumed a 2-cell LiPo, but they don't specify).

Harris
03-16-2006 Over year old.
HOMEPAGE  
 
 
Franconia2
Heliman
Location: Shrewsury, MA

This version of the ignition does not include Computer Timing Control. The timing is fixed at 30 degrees from TDC.
03-16-2006 Over year old.
 
 
Krtek
Heliman
Location: Czech

ignition

BME supply now the engine with Falkon ignition with elctronic timing advance.

www.falkon.cz/bme.htm

Krtek
03-16-2006 Over year old.
 
 
Flying Tivo
Veteran
Location: Monterrey,NL,Mexico

CDI with Variable timming

Here is another CDI you can consider, is seams smaller and lighter.

Felipe

If life throws at you lemons......Squirt some lemon juice in the eye of your enemy!!!!
03-16-2006 Over year old.
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Franconia2
Heliman
Location: Shrewsury, MA

CDI with Variable timming..

Look cool and lightweight. But the specs say the max rpm is 10,000. The BME runs over 13,000.
03-16-2006 Over year old.
 
 
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Gohbee Aviation Stinger 30-90 > Gohbee / TZ / Raptor 90 Heli with BME modified G90 Gas Engine
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