Very welcome Mr Ben!! 👍👌

thank you, unfortunately there has been a set back since this video.

I'm glad you found the videos of interest. Learning is fun 👍

True, ha! Thanks

Thanks, I've ordered CF53 should be here this week. The only thing I need to check out is the shear strength of case hardened shaft. I'm expect it will be fine though it's only under 125kg of shear force.

Thanks a lot! 👍

Thank you but I'm certainly no genius, very average I would say. If I can do this then any average person can. 🙂 I'm certainly looking forward to more hovering this summer. 👍

I also wish to make one,👍😊

Glad you enjoy it 👍 I'm really looking forward to the next test flight. It has been several months since I last tried to hover, might be a little rusty to begin with. Hopefully the case hardened shaft will turn up this week, then it's just fuel up and wheel out to the field. Weather permitting of course.

Thanks. Yes I could have and it would have saved some weight by doing so. Didn't think of doing that to be honest. Perhaps a future mod when more weight has to be removed. 👍

I'm looking forward to being able to relax and enjoy it rather than just be stressed out. 🙂 yes a bolted frame is great when it comes to making changes.👍 welding is lighter but no aircraft I can think of uses a welded fuselage.

You aren't wrong. 😉 thanks for the battery recommendation that was very helpful.

Hi, the blades are not twisted, they are straight and parallel. A blade with a 6 degree twist would have been more efficient but harder to make. If I removed the rubber drive coupling I might not have had the driveshaft failure. However having a solid mounting may have overstressed the drive belts. I'm not sure but unfortunately the project is on hold for the time being.

Thanks, I need to weigh the machine to find that out, my scales weren't giving consistent readings last time. I need to purchase some better ones. Hoping for around 125kg empty weight.

Hi and thanks. The top rotor is 5.5 degrees and the bottom rotor is 6.5 degrees.

@@Ben-Dixey have you tried a greater angle like 10 degrees?

No, I haven't tried anything more than what it's set to now. I took it out on Thursday for some testing and it was lifting off at around 720 rotor rpm, previously it was 780 rotor rpm. I don't know what pitch is going to be most efficient for lift but I'm expecting perhaps 7 degrees might be, on the top rotor at least maybe 8 on the bottom. It could be even higher and 10 degrees could be optimum. I haven't gone into the calculations on this so don't know.

Hi, it's a 2 stroke but the engine isn't running at its peak Hp. If I change the gearing and raise the rpm then another 5-10hp could be achieved. This could equate to another 27kg in extra lift. It's an option but I'm hoping not necessary. The pitch is 5.5 degrees on the top rotor and 6.5 degrees on the lower. I believe somewhere around 7 degrees could be max efficiency, I haven't tried more pitch. There isn't a huge amount of weight still to come off it's true but it's surprising when you start looking what can be reduced.

Why different pitch angles for top and bottom rotor blade😮

There are different pitch angles because the lower rotor is operating in the downwash of the top rotor. In order for the torque to balance it has to have a higher pitch angle. The lower rotor is exposed to turbulent air but also downward air which reduces its angle of attack compared to the top rotor.

Okay, thank you very much.

@@Ben-Dixey Your upper rotor pitch is smaller than the lower one. As far as I remember the theory of coaxial propellers, the angle of attack (tilt) of the lower blade should be less than that of the upper one. This is because the lower blades meet the airflow that has changed direction under the action of the upper rotor. This looks like an absurdity, but in the design bureau of Kamov (and not only), they received more lift when the lower rotor had a smaller angle of inclination of the blades than the upper one. If you draw a diagram of oncoming flows on the blades that are moving towards a meeting, then the absurdity turns into truth. If in your design it is not difficult to change the angle of inclination of the blade in relation to the oncoming air flow, then it will not hurt to try.

I can't argue, the hose connector material was a poor choice as was the bullet style connector.