I have seen discussions on forms that their is no need for a pusher prop on a fixed wing plane and their is no need for them to be made you just simply reverse the motor. To which i reply if you mount your motor on the back of the plane then you should NOT reverse the motor instead fit a pusher prop as that will help the prop nut stay tight.
I would never use a 3D printed prop. They are subject to huge stresses, are very complex aerofoils and are cheap enough to buy. ABS is a plastic you'd find props in that you can print with..
@@Painless360 I think might work using a resin printer. I know Integza has created an impeller for a turbo, but not after multiple attempts. I agree at the cost/effort factor.
On the pusher one can use the CW rotating drone motor, if there is the same KV/size version. And as a second option, one can use a R type propeller on the normal rotating CCW motor. In either case nut will be tightened on the run.
I am always confused about how the rotation direction is determined. Standing in front of the plane and looking at the prop or standing behind and looking at it in flight direction...
Consider the direction of the hands of a clock while looking directly at the propeller, this is clockwise (CW). This is how you judge the direction of rotation. Counter Clockwise (CCW) is in the opposite direction of the hands of the clock. Always keep this as a point of reference, A clock's arms direction of rotation infront of you.
@@wilburgonsalves7741 Unfortunately that's not helpful because the tradition in full size aviation is to use the OPPOSITE convention and describe the propeller as clockwise if it turns clockwise as seen from the pilot's seat in a tractor aircraft (i.e. one with the propeller at the front). That USED to be the convention used by modelers as well. However, in recent years, in model aviation, the OPPOSITE convention is now commonly used. So there is just mass confusion. No doubt that is why Kjell is asking the question.
Great video on very important fundamentals. I discovered that even if you have the correct CW/CCW motor and nut threads, if the motors are spinning really fast, and then suddenly stop, the inertia can unwind the nuts. Mission Planner's motor test taught me a valuable lesson, so now I use nylock nuts. They are though sometimes hard to find with CCW threads.
One of my multi rotors have two clock and two counter, but my other multi has all nuts just standard righty tighty. Nylock nuts. Never had a problem and I enjoy not having to think about reverse thread.
Excellent explanation, nice one. You didn't mention the case where the motor is fitted behind the firewall in the nose so the motor is fitted back to front with a prop adapter on the shaft sticking through - that confuses a lot of people that I fly with. Have you covered that somewhere else?
Uh, do pushers mount the motor at an offset to counteract the same rotational torque that can make a prop nut come off? I haven't seen a single motor tractor that doesn't and they will only work with a CCW spinning prop. The only pusher I have is my nano Talon and there is no offset. I haven't owned a mid motor pusher plane with a =>2212 motor . From what I see in pictures and videos it doesn't appear so. Would not that mean the airframe would be motor direction agnostic? In that case cannot one simply reverse motor direction and your prop nut becomes self tightening again? What about planes with 2 motors? When I built my binary I used two 2216 motors. I was easily able to find a 22xx prop adaptor set with a ccw and a cw for $6 or so on ebay. Now I'm working on a build with two 2814 motors. It appears CW spinning CCW thread prop adaptors for 28xx motors are non-existent. What the ? I can't find one and if anyone knows where on can be had at a fair price I would be grateful. I guess I could look for an M5 or M6 prop nut with a teflon washer in it to wrestle with in the field ,ugh.
I'm really, really getting into Delta Wings. You are definitely one of my inspirations to build an Inav rig soon, I can't wait to dig into your playlists. Once again, I came to the question of why I can't find 9x6 or 9x4.5 props for my FT Spear (not a quadcopter pack of both sets, ya know). And you have the answer. My 3 pack of uxcell 9x6 props are great for my planes and the nut won't loosen, but when I flip it around for my FT Spear...yea. Thanks again for all the answers man!
OK, with a RH thread, for the motor's torque to tend to tighten the prop nut is it referred to as a CCW rotation, as seen from the front, or a CW rotation, as seen from the rear. Always confusing when selecting motors to buy for specific applications. Thanks!
Exactly what I needed, thanks. I was trying to figure out prop direction in your AR Wing Build vid but that section was very fast and didn’t mention direction.
The prop-nut will have to have the same thread as the motor regardless of the direction of rotation. The trick is to try and get it so that the nut isn't spun off the motor if it comes loose. Happy flying!
You spin the prop in the direction it needs to move to create thrust. Using things like Nylock nuts mean that it'll stay tight for almost all use cases.
So when you want to change prop direction on a multi rotor , (from props in to props out, rotating in to the sides instead of front and rear), ideally you should swap motor position to correct motor shaft threading ? Or nylon nuts are sufficient ?
By simply looking at it. With it on front of you with any writing or raised lettering on top, imagine turning in each direction and note the direction that would make it 'fly' upwards.. Happy flying