Does anyone have a 3mm shaft dia prop adapter, with length more than 20 mm?. What I have is one with length 15mm. The propeller hub thickness takes up 10mm and there's barely some room for the spinner nut or whatever we call that to tighten.

Try searching it. But if don't find one lathe operators may make one for you.

After a whole lot of crashes, we put the prototype to bed. Tomorrow, I'm making another one, and this time, I'll remember to post pics with newspaper so that it can be accepted as a sweepstakes entry.

Update: We participated in Boeing aeromodelling competition at IIT Madras, and managed to get 7th Position out of 45 odd teams that participated. Our Plane did fly but was underpowered for some reason.

 

Thank you sir!