baco

Hi, due to Covid 19 in my country I still living at home from March up to...who knows?! I did two different new models and now I found 8 Electrifly T 400 brushed and two Esc . It seems to be the perfect moment to build a very long time delayed project an IAe 38 Naranjero designed by Reimar Horten. She only needs 4 motors and having motors, props, and Esc ther´s no reson to buy some different (Brushless + Esc)

Also I designed a shaft extension to be 3D printed cause motors are close to CG and props area at the trailing edge.

Every thing seems fine except for two bolts which fix motor to shaft extension. I don´t know size and thread so I´m not able to order on line...Somebody knows size of thes two shaft extension? Please look at the motor picture, theard for bolts are circled in red.

Id did I try with 2/56 but they are too small

piper_chuck

I don't know if you found the bolts or not. I don't have any of these motors, but I found a little info online. One manual mentioned 2.6mm mounting bolts, but did not give a length. I found another page for a T400 gearbox that says it includes 2.4 x 5mm and and 2.5 x 5mm mounting bolts.

quorneng

From research on a 400 (or 380) the mounting holes are M2.5 thread. On a 540 motor they are M3.
From my RC car days you have to be careful not to screw in too far or it will touch the winding and wreck the motor.