Home-made BL Motor Mount

[killioughtta]

I just wanted to share my idea on mounting my Towerpro brushless motor (I know, I know, TP sucks, yadda yadda) onto my SC's firewall.

I knew I wanted to mount it to the firewall so I could keep the down-and-right angle on the shaft. I didn't have time to wait for a mount from HobbyCity or any other website and my LHS was too far to go during the week and I HAD to mount it. I also like the challenge so I searched wattflyer for help and stumbled upon this little post by one nifty dude.

So I went and got a 3/16 thick piece of plywood and a 1 inch thick by 1 1/8 inch long wooden dowel and got to work. I cut the plywood to fit over the holes on the firewall by placing the stock gearbox on the plywood and putting a dot where each screw goes and where the shaft should be then cutting out the shape with a utility knife. I pre-drilled the holes and sanded the edges.

The shaft comes all the way back but isn't flush with the aluminum back plate of the motor; it sticks out about 1/8 of an inch. That wouldn't work so I drilled a hole in front of the dowel so the shaft could spin freely; I put a bit of epoxy in and around the hole to prevent dust from damaging the motor and attached the dowel to the plywood with a single screw from the back and some epoxy.


the wooden mount attached to the SC's firewall.
You can see the hole on the dowel where the back of
the shaft spins; it has some epoxy on the surface.

I then attached the motor to the mount with three wood screws and Gorilla Glue. That glue foams up as it sets so I figure that will help dampen the vibration from the motor a bit. Done deal.

And here it is:



Link to the original post I got this idea from:
www.wattflyer.com/forums/showthread.php?t=32125

[admiralev]

really clean mod erwin looks great! best BL mount ive yet to see

admiral

[killioughtta]

Why, thank you! I took her out for the maiden today! Besides needing some balancing, she was awesome. The mount held on perfectly and that TP 2409-18T was awesome power.

[Dillzio]

Very nice work! I think that the thrust angle is dictated by the angle on the firewall, and on the gearbox. If you look at duck's mod, you'll see he actually cut down a gearbox and put a piece of ply onto that to preserve the original thrust angle: supercubclub.proboards.com/index.cgi?board=sccgeneral&action=display&thread=2358&page=1#16270

Now that you've upgraded your powerplant, you may actually need even more of an angle to compensate for the increased torque and thrust. I've read of one guy that did this type of mod, and used a washer placed between the ply and the fuselage (I don't think he didn't use a stock firewall) in the top left hand quadrant to adjust the thrust angle. If you find that you do want to increase your thrust angle, that might be a good way for you to go. You should be able to tell if you need to increase your thrust angle if the plane wants to bank left at high throttle.

What speed controller are you using? If you could post a pic of your planes guts that would be great - would be interesting to see how you've mounted your ESC, battery and receiver.


Thanks,

-Dill

[killioughtta]

Sept 21, 2009 6:43:04 GMT 1 Dillzio said:

What speed controller are you using? If you could post a pic of your planes guts that would be great - would be interesting to see how you've mounted your ESC, battery and receiver.


Thanks,

-Dill

Of course!



On the left is the Towerpro 25 amp speed controler (Found here) with Deans Ultra connectors.
The battery box is modified for a 2200 mAh 20C Zippy (not shown), vertical (Found here).
To the right, black, is the HK TR6A receiver (Found here).
Connected to it, bottom, blue, are two Turnigy 9 gram servos (Found here)