e-motor location
01-02-2010, 02:04 PM
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e-motor location
I am converting a Goldberg Eagle 2, which was given to me mostly built, to e-power and am having fun working it out. I have looked at every thread and site I can find doing this project. My question is how high on the fire wall should or can I mount the motor? I have two glow planes and have only been flying since June 2009. My two glow planes seem to have the prop shaft centered in the engine "area". I am concerned about the nylon steering block being in the way. I am going to put a piece of plywood across the nose and use long threaded rods from the plywood to the firewall and screw the motor to the plywood. I saw a photo of this on the net somewhere. I copied the photo but don't remember the site so I can't get back there. Think I Googled conversions. Anyway how about the motor placement? Can it be up a little?
Thanks
Thanks
01-03-2010, 03:24 AM
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RE: e-motor location
Whip ... keep the shaft centered. How far out does not really matter other than for CG purpose. I usually extend it as far as I can because motors are much lighter than engines. Later when you fly her, you can adjust the side thrust.
If you are doing a back mount, that means the prop it attached to the rotating can, then what I will do is to line up the radial mount against the firewall to get the thrust line right and then mark out the mounting holes. I prefer back mounting because the rods or stand offs can be shorter. I fabricate my own using aluminium rods, its easy. Make them in various lengths and you can adjust accordingly. As for the base, use a big sturdy washer ... that will give a much more stable base for the stand offs and the whole thing will be more rock solid. Here are some pics of how I converted some planes ...
For the stand offs my OD is 8mm and ID 3mm, I use an M3 bolt. Remember when drilling the ID it needs to be a smidge more than 3mm, if not the M3 bolt will not pass through.
If you are doing a back mount, that means the prop it attached to the rotating can, then what I will do is to line up the radial mount against the firewall to get the thrust line right and then mark out the mounting holes. I prefer back mounting because the rods or stand offs can be shorter. I fabricate my own using aluminium rods, its easy. Make them in various lengths and you can adjust accordingly. As for the base, use a big sturdy washer ... that will give a much more stable base for the stand offs and the whole thing will be more rock solid. Here are some pics of how I converted some planes ...
For the stand offs my OD is 8mm and ID 3mm, I use an M3 bolt. Remember when drilling the ID it needs to be a smidge more than 3mm, if not the M3 bolt will not pass through.
01-03-2010, 04:05 PM
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01-03-2010, 09:26 PM
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RE: e-motor location
ORIGINAL: whiptail1
On the blue plane are there washers between the stand offs and the fire wall? With blind nuts behind?
On the blue plane are there washers between the stand offs and the fire wall? With blind nuts behind?
01-04-2010, 09:35 PM
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RE: e-motor location
I went to the local hardware store on Sunday and found 3" 8-32 threaded rod, 1" & 1/2" aluminum threaded spacers and a piece of K&S .046 aluminum sheet about 6x4" in the brass tubing hobby stuff. Also got nyloc nuts. They have blind nuts but I didn't get them. From my measurements the aluminum plate will be about 1-1/2" from the firewall so that the prop will be ahead of the front of the plane. My plane still has the sides on it that are around the engine area. It is about 32 degrees F. in my garage here in north Idaho so I don't work out there for long periods of time. I will send photos when the plane is done. If I can cut and drill the plate it should not take long. Really appreciate your help. I am saving all of the photos and info. Tom
01-05-2010, 04:05 PM
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RE: e-motor location
Here are a couple of photos of my work so far. I forgot that the motor has to tilt down so I am off to the store for more short spacers. Here is a question for you. I still have my first plane, a Horizon Super Cub foamie. The motor is tilted down and to the right. I noticed that the glow engines are not like that. the foamie doesn't have ailerons so could that be why the motor is turned to the right? It is also a tail dragger.
Tom
Tom
