Originally Posted by
Henning
I flew my Naruke Ascent for the first time this weekend with the Brenner V4 drive. This is the the third motor set-up in this model. First Pletty Advance and then the OS belt drive. Both works well but the Contra took the model to another level flying the F17 schedule. The constant speed and the breaking just makes the manoeuvres look less stressed. I got more time to prepare for the next manoeuvre. The torque and power of the Pyro 600 with Mejzlik 22x20F and 22x22R are so good.
After gaining some knowledge with rubber damping the OS belt drive I decided to design my own motor mount for the Contra drive. One of the main motivation for designing my own was due to the “issues” that has been reported with the rear support bearing and twisting in knife edge manoeuvres in the F17 schedule. My mount eliminates that problem. The pictures explains it better than me.
The firewall is of wood and is a laminate of 0,8mm plywood on both sides with 2mm balsa in the middel. It is lamented with epoxy and heated to 60+ degrees C during curing for extra strength. The front dampers are D10 by H8 mm 60 shore and the rear are D8 by H8 mm 55 shore. I am using fiberglass instead of carbon as it dampens vibrations better. The 4 spacers which makes the whole difference to this month are of aluminium with M3 threads inside and are from a camera drone supplier.
The sound level from this set up is really low in the air and it is the noise from the propellers that can be heard and not the gears.
It is one concern that i have and that is the play in the rear support roller bearing. Is it by design that it is so loose? Will I run into any issues if i replace the bearing with one that fits the motor axel?
Regards,
Henning
Hey Henning,
You should have no problem replacing the rear needle bearing with a more traditional bearing. The motor rotor shaft is through hardened to 62RC, so there will be no fretting issues between the shaft and the inner race of a bearing. We are testing a bearing like this right now.
How heavy is your system?
Brenner ...