Location of batteries for DLE 20
07-29-2011, 05:34 AM
#1
Location of batteries for DLE 20
I am setting up my first gasser and have questions:
Can I locate the ignition battery near the receiver [want it as far back as possible for balance ] if not how far away does it need to be?
Is there a problem placing the ignition module above the gas tank?
How do you set up the gas tank vent line?
Thanks,
Gary
Can I locate the ignition battery near the receiver [want it as far back as possible for balance ] if not how far away does it need to be?
Is there a problem placing the ignition module above the gas tank?
How do you set up the gas tank vent line?
Thanks,
Gary
07-29-2011, 07:19 AM
#3
RE: Location of batteries for DLE 20
Mr. Moderator, Batteries absorb RF energy? That's an interesting thought. Is there any test data available to back that up? How about the wires leading to the batteries. They should be acting as good conductors or antennas of the energy. I would advise Roo to follow good RF techniques and keep the ignition system components as far away from the RF as possible. Dan.
07-29-2011, 07:45 AM
#4
RE: Location of batteries for DLE 20
ORIGINAL: DAN REISS
Mr. Moderator, Batteries absorb RF energy? That's an interesting thought. Is there any test data available to back that up? How about the wires leading to the batteries. They should be acting as good conductors or antennas of the energy. I would advise Roo to follow good RF techniques and keep the ignition system components as far away from the RF as possible. Dan.
Mr. Moderator, Batteries absorb RF energy? That's an interesting thought. Is there any test data available to back that up? How about the wires leading to the batteries. They should be acting as good conductors or antennas of the energy. I would advise Roo to follow good RF techniques and keep the ignition system components as far away from the RF as possible. Dan.
Batteries and capacitors are first cousins of each other.
It is almost as if the power wire from the battery to the ignition module is grounded at the battery as far as RF is concerned.
07-29-2011, 09:04 AM
#5
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RE: Location of batteries for DLE 20
ORIGINAL: Roo Man
I am setting up my first gasser and have questions:
Can I locate the ignition battery near the receiver [want it as far back as possible for balance ] if not how far away does it need to be?
I am setting up my first gasser and have questions:
Can I locate the ignition battery near the receiver [want it as far back as possible for balance ] if not how far away does it need to be?
Six/6 inches is a good rule of thumb, not always possible though.
Is there a problem placing the ignition module above the gas tank?
How do you set up the gas tank vent line?
then form a circle with it, then route it down to exit the fuselage.
Photos are of my H9-Twist 150 w/DLE20. Vent line goes from
left -to- right at top of tank, then down & out bottom of fuse.
Receiver is to the right, under the canopy, while the ign module is above the eng.
Being new, you'll find loads of good info here;
Newbie to Gas General Info....
http://www.rcuniverse.com/forum/m_8673009/tm.htm
.
What Aircraft are you installing your DLE20 .....
http://www.rcuniverse.com/forum/m_10197884/tm.htm
.
NEW DLE 20cc Gasser! (Data & Links 1st Post) .....
http://www.rcuniverse.com/forum/m_9863953/tm.htm
07-29-2011, 10:18 AM
#7
RE: Location of batteries for DLE 20
Gary, Here's the website for the DLE 20 manual that Tower is using. The installation advice is at the end of page 3 and the beginning of page four. Please take the time to read it. Dan.
http://manuals.hobbico.com/dle/dleg0020-manual-v1_1.pdf
http://manuals.hobbico.com/dle/dleg0020-manual-v1_1.pdf
07-29-2011, 03:25 PM
#8
RE: Location of batteries for DLE 20
Mr. Moderator, not quite at 2.4Gigahertz. At that frequency the wavelength is 4.9 inches which puts it in the realm of microwaves. Circuit theory with discreet components does not apply. That means that capacitors are not capacitors etc. but are something entirely different depending how they are made. That wire from Gary's ignition module, which I will assume is up near the engine, to the ignition battery could be several wavelengths long and that's a lot. The receiver’s antenna is only a quarter wavelength long. There is a good possibility that all the RF trash generated by the ignition module and spark may one day get propagated along that wire and that could be devastating. Those Rf absorbing batteries you use wont do him a bit of good. Hopefully Gary will follow all the advice from the radio manufacturers and the DLE manual and separate the two systems. Dan.
07-29-2011, 03:42 PM
#9
RE: Location of batteries for DLE 20
ORIGINAL: DAN REISS
Gary, Here's the website for the DLE 20 manual that Tower is using. The installation advice is at the end of page 3 and the beginning of page four. Please take the time to read it. Dan.
http://manuals.hobbico.com/dle/dleg0020-manual-v1_1.pdf
Gary, Here's the website for the DLE 20 manual that Tower is using. The installation advice is at the end of page 3 and the beginning of page four. Please take the time to read it. Dan.
http://manuals.hobbico.com/dle/dleg0020-manual-v1_1.pdf
When you buy a DLE from Tower, the box has the DLE factory package sealing tape on it. They do not look at them.
07-29-2011, 03:57 PM
#10
RE: Location of batteries for DLE 20
ORIGINAL: DAN REISS
Mr. Moderator, not quite at 2.4Gigahertz. At that frequency the wavelength is 4.9 inches which puts it in the realm of microwaves. Circuit theory with discreet components does not apply. That means that capacitors are not capacitors etc. but are something entirely different depending how they are made. That wire from Gary's ignition module, which I will assume is up near the engine, to the ignition battery could be several wavelengths long and that's a lot. The receiver’s antenna is only a quarter wavelength long. There is a good possibility that all the RF trash generated by the ignition module and spark may one day get propagated along that wire and that could be devastating. Those Rf absorbing batteries you use wont do him a bit of good. Hopefully Gary will follow all the advice from the radio manufacturers and the DLE manual and separate the two systems. Dan.
Mr. Moderator, not quite at 2.4Gigahertz. At that frequency the wavelength is 4.9 inches which puts it in the realm of microwaves. Circuit theory with discreet components does not apply. That means that capacitors are not capacitors etc. but are something entirely different depending how they are made. That wire from Gary's ignition module, which I will assume is up near the engine, to the ignition battery could be several wavelengths long and that's a lot. The receiver’s antenna is only a quarter wavelength long. There is a good possibility that all the RF trash generated by the ignition module and spark may one day get propagated along that wire and that could be devastating. Those Rf absorbing batteries you use wont do him a bit of good. Hopefully Gary will follow all the advice from the radio manufacturers and the DLE manual and separate the two systems. Dan.
People do all kinds of unacceptable things with their ignition engines like mounting the throttle servo an inch away from the carb with the ignition unit not far away and get away with it - even on 72 mhz FM. I think one of the greatest effects of stray noise getting in our systems comes from it getting into the servo signal lines.
Jim
07-29-2011, 04:08 PM
#11
Senior Member
My Feedback: (1)
RE: Location of batteries for DLE 20
An inch away from the carb? How about an integral part of the carb body? It doesn't get any closer than that. I can assure you, and our overly cautious friend, no problems. It's long past time to move into at least the late 20th century. Information contained in any of the Chinese manuals is at best dubious, and always incomplete. I left out incompetant to be polite. The Futaba manuals are also still written with magneto driven engines in mind. For most retail companies, their tech pubs are quite low on the budgetary ladder, if there's any budget for updates at all.
07-29-2011, 06:27 PM
#12
RE: Location of batteries for DLE 20
ORIGINAL: DAN REISS
Gary, Here's the website for the DLE 20 manual that Tower is using. The installation advice is at the end of page 3 and the beginning of page four. Please take the time to read it. Dan.
http://manuals.hobbico.com/dle/dleg0020-manual-v1_1.pdf
Gary, Here's the website for the DLE 20 manual that Tower is using. The installation advice is at the end of page 3 and the beginning of page four. Please take the time to read it. Dan.
http://manuals.hobbico.com/dle/dleg0020-manual-v1_1.pdf
this is much better than the DLE company manual. I do plan on separating the systems as much as possible just to gbe on the safe side.
Gary
07-30-2011, 05:21 AM
#15
RE: Location of batteries for DLE 20
I think the actual factory setting is 32 degrees for the DLE 20? I wouldn't go any higher than that!.
Typically the sensor is centered on the crankcase seam.
Otherwise, you will have to set up a degree wheel, find top dead center, and see where it sparks at?
You can print out the dgree wheel and past it to some poster board or thin plywood. Use a straightened paper clip as a pointer?
Typically the sensor is centered on the crankcase seam.
Otherwise, you will have to set up a degree wheel, find top dead center, and see where it sparks at?
You can print out the dgree wheel and past it to some poster board or thin plywood. Use a straightened paper clip as a pointer?
07-30-2011, 07:32 AM
#17
RE: Location of batteries for DLE 20
When watching Milton's excellent video, you will notice that he sets the spark timing at 28 degrees.
Most engines are set a 28 degrees with a regular CH or RCEXL ignition module.
If you are using a regular RCEXL ignition module on your DLE 20, you will want to set the timing at 28 degrees BTC.
But with the model #4 DLE ignition, the timing is set at 32 degrees.
Most engines are set a 28 degrees with a regular CH or RCEXL ignition module.
If you are using a regular RCEXL ignition module on your DLE 20, you will want to set the timing at 28 degrees BTC.
But with the model #4 DLE ignition, the timing is set at 32 degrees.
Both 38 and 32 degrees are wrong for a high revving gas engine.
