Blade mcpx settings for a pleb!

[tomatwalden]

How do you set your pitch to 0 on throttle hold?

Set the TH pitch curve to 0,25,50,75,100. ... Move the collective stick to the exact middle (you can check on the monitor screen), then fold blades back against each other. If you've got zero pitch, they'll near as damn it, line up. If they form a significant V shape, you don't have zero pitch.

[dillwhacker]

then fold blades back against each other. If you've got zero pitch, they'll near as damn it, line up. If they form a significant V shape, you don't have zero pitch.

They need to be parallel to the boom as well.
If they are lined up, but not parallelel to the boom, all this shows is that the positive on one blade equals the negative pitch of the other....
HTH
T

[myxiplx]

Set the TH pitch curve to 0,25,50,75,100. ... Move the collective stick to the exact middle (you can check on the monitor screen), then fold blades back against each other. If you've got zero pitch, they'll near as damn it, line up. If they form a significant V shape, you don't have zero pitch.

Surely he needs to set it to 50,50,50,50,50? I don't use his TX, but it needs to be a flat curve for pitch, with no variation at all.

The idea is to force the blades to zero pitch no matter what you do with the stick :-)

[tomatwalden]

They need to be parallel to the boom as well.
If they are lined up, but not parallelel to the boom, all this shows is that the positive on one blade equals the negative pitch of the other....
HTH
T

Not sure how you figure that! Assuming no cyclic input, the collective pitch will be the same regardless of the orientation of the blades with the boom. Zero pitch should be zero pitch all around the disc!

Surely he needs to set it to 50,50,50,50,50? I don't use his TX, but it needs to be a flat curve for pitch, with no variation at all.

The idea is to force the blades to zero pitch no matter what you do with the stick :-)

That'll work too! I'm just used to using the linear curve because you need it when setting up a FBL unit.

[Peteski]

They need to be parallel to the boom as well.
If they are lined up, but not parallelel to the boom, all this shows is that the positive on one blade equals the negative pitch of the other....
HTH
T

I don't really get that either. Are you talking about the swash not being level?

[Peteski]

Surely he needs to set it to 50,50,50,50,50? I don't use his TX, but it needs to be a flat curve for pitch, with no variation at all.

The idea is to force the blades to zero pitch no matter what you do with the stick :-)

That's correct for his TX, presuming 50% does actually equal zero pitch in reality. That's what he needs to check to make sure his swash is not too high or too low. If there is positive pitch on the blades at 50% then the swash needs lowering and vice-versa. For checking pitch range on a micro I temporarily set my TH pitch curve to 0/50/50/50/100 so I can check that centre stick gives zero pitch and that full negative and positive pitch are roughly equal. I just eyeball it on a micro, but you could measure the gap between the blades. Don't forget to reset your TH pitch curve to 50/50/50/50/50 afterward though!

Bluenose - this is the best £10 you could invest right now to cut through all the confusion on setup, even has a specific guide on setting up micros and it's a great reference guide for all cp helis:-

RC Helicopter Tips & Setup eBook

[Peteski]

How do you set your pitch to 0 on throttle hold?

It's the same as setting pitch in any of your other flight modes, don't forget that the pitch curve is specific to the flight mode. Your TX should indicate which flight mode it is in when setting pitch curves, for example my DX8 indicates N/1/2/H flight modes on the pitch curve display. Zero pitch should be 50% on your pitch curve, so as described above, you need a flat pitch curve of 50/50/50/50/50 on your 'H' flight mode. But you must check that 50% does actually give you zero pitch on your heli, otherwise the swash needs resetting.

[Euclid]

This thread has been a god send, thanks to Bluenose for starting it. I've just programmed my 130x with the Normal Mode Settings that Tom and Pete are advocating and at long last I feel I'm almost keeping up with it. The 130 is my least favourite heli of my four but that might soon change thanks to this thread. More importantly I'm now understanding what I'm doing and why. Thank you to all contributors, those answering the questions and those asking them.

[Bluenose75]

That's correct for his TX, presuming 50% does actually equal zero pitch in reality. That's what he needs to check to make sure his swash is not too high or too low. If there is positive pitch on the blades at 50% then the swash needs lowering and vice-versa. For checking pitch range on a micro I temporarily set my TH pitch curve to 0/50/50/50/100 so I can check that centre stick gives zero pitch and that full negative and positive pitch are roughly equal. I just eyeball it on a micro, but you could measure the gap between the blades. Don't forget to reset your TH pitch curve to 50/50/50/50/50 afterward though!

Bluenose - this is the best £10 you could invest right now to cut through all the confusion on setup, even has a specific guide on setting up micros and it's a great reference guide for all cp helis:-

RC Helicopter Tips & Setup eBook

If if its just a £10 then I think I will go for it, thanks for the link!

[Peteski]

Yeah it's well worth the money, it's a well respected and easy to follow guide. The section on specific setup for cp micros is extremely useful when starting out and will save you a lot of hassle.

[dillwhacker]

Not sure how you figure that! Assuming no cyclic input, the collective pitch will be the same regardless of the orientation of the blades with the boom. Zero pitch should be zero pitch all around the disc!

All I mean is, if you fold the blades back over the tail, and they line up, that only means zero pitch if they are parallel to the boom (viewed from the side).
If the tips line up but both blades are dangling down toward the boom, that isn't zero pitch.

[tomatwalden]

All I mean is, if you fold the blades back over the tail, and they line up, that only means zero pitch if they are parallel to the boom (viewed from the side).
If the tips line up but both blades are dangling down toward the boom, that isn't zero pitch.

They can only both dangle together towards the boom if there is cyclic applied (the swash leaning backwards). Any positive or negative collective pitch will result in a V shape as the blades diverge away from each other.

[dillwhacker]

They can only both dangle together towards the boom if there is cyclic applied

Or if the links are bent / badly adjusted etc. That was my point, it's not a definitive check for zero pitch.

[Bluenose75]

Ok so managed to run 2 cells today outside using normal mode and survived! Just hovering, it did run away a couple of times but I got it back, had to drop it a couple of times into the grass but no damage as I used TH each time, it was windy so look forward to a clear day! Thanks all for the advice, it's quicker than the 200srx!

[myxiplx]

Oh yeah, it's quick :-D

First time I flipped a BL inverted I got a bit low and panicked, and went full negative. By the time I realised what I'd done the damn thing was upside down about 10 feet above the top of my house. Took some concentration getting it back down from there I can tell you!!