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Home✈️Aircraft🚁Helicoptere-AlignT-REX 450 › swash setup
04-25-2011 06:14 AM  10 years ago
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ntec

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Winnipeg, Canada

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swash setup
Hi i have a se v2 which i have setup for just basic hovering around with a dx7 radio. I'm now trying to set it up for stunt mode but the issue is in order for me to get +11 pitch I have to increase the pitch in the swash menu to like 80% which I know is not right and shouldn't be that high. I have already checked to make sure I'm getting 10mm spacing between the top of the frame and bottom of swash. The servo's are all hs65's and all have been centered at mid stick so I don't know what else it could be.
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04-25-2011 05:21 PM  10 years ago
Funknrock

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San Marcos, CA

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not sure why you're changing swash mixing. adjust your servo travels to 125-150% for cyclic H & L.My crashes are cooler than your flying! ;^)
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04-25-2011 05:25 PM  10 years ago
ntec

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Winnipeg, Canada

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Ok I will try that. I'm still in the learning process with all this technical stuff. Thanks
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04-25-2011 05:34 PM  10 years ago
Funknrock

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San Marcos, CA

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if you have all your servos moving in the right directions don't mess with swash mixing.
but adjusting the travels will give you max throw. but you will then probably need to give it some Expo if it gets too twitchy for you.
My crashes are cooler than your flying! ;^)
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04-25-2011 06:46 PM  10 years ago
integy2

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California USA

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What's hold on the servo horn do u use?
(might be the answer)
(Good flight end up with ...... big smile :D)
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04-25-2011 08:28 PM  10 years ago
Richardmid1

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Leeds, England

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What you are doing is correct. Not sure why you think 80% pit. in the swash mix isn't right as that all depends mainly on what length servo arm you use. The closer you can get to 100% gives you the best resolution. Your servo to swash links should be close to vertical at mid stick.60% of the time, it works every time!
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04-25-2011 11:56 PM  10 years ago
ntec

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Winnipeg, Canada

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I am using the second hole out from the horn screw. It looks like adjusting the servo travel is fixing it.
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04-26-2011 03:38 AM  10 years ago
Newbe Guy

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Phoenix, AZ

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@ ntec

HEY!.. we have EXCACTLY the same setup to the servos! I'm just learning about the radio mixing. Now it is setup very docile. I want to set it up more aggressive... or at least "average". Sounds like youre way ahead of me for I dont have the kit build experience, manual and all that. I DO have a good buddy that knows alot thankfully. However Ive got to learn this stuff on my own.

Take care happy flying.
Blade mSR / Trex 450se V2 - AMA#965156
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04-26-2011 09:22 PM  10 years ago
Richardmid1

rrProfessor

Leeds, England

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Heres what you should do:

Make sure throttle hold is activated!

In throttle hold....

Make sure servos are traveling in the right direction to a given stick input. Move collective up, swash should move up etc. if swash moves down, change pitch % from + to - or vise versa in the swash mix menu in your radio. If one or more servos moves one way and the other/rest move the other way when moving collective then you need to reverse the servo channel(s) that is going the wrong way.

Zero any trim and sub trim, find the servo arm that gets you as close to 90 degrees to the main shaft as possible AT MID STICK (pitch curve should be set to 0-25-50-75-100 throughout all flight modes). You may need to use some sub trim for each channel to get each servo to 90 degrees.

(stay at mid stick)...
adjust servo to swash links so the swash is in the center of its travel and the washout base arms are in line with each other. Also make adjustments to these links to get the swash level, eyeball the swash from both sides, front and back to check its level.

Adjust the long links that go from the swash upto the upper mixing arms till the upper mixing arms are horizontal, you may need to hold the flybar horizontal to get this right.

Adjust the short main blade grip links till you have zero degrees pitch on the blades.

You are now setup machanically. From here start with swash mix % of around 60% for ail, ele, and pit. and test fly. If you require more collective, increase the pit % in the swash mix menu, if you require more cyclic, increase the ail and elev % in the swash mix menu.

As you get into 3D and start increasing your cyclic you will find adding around 20% expo on aileron and elevator will help make it less twitchy in a hover and reduce unwanted accidental stick interaction.
60% of the time, it works every time!
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04-26-2011 10:48 PM  10 years ago
ntec

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Winnipeg, Canada

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woah thanks for the whole writeup. I have linear curve for stunt but normal I have it at 35-40-50-75-100 and I was finally able to get +11 pitch but for some reason I can only get -6 pitch when in stunt mode. I noticed the links for the blade grips were not the right length so that played a part in why I couldn't get enough positive pitch. I will have to check my swash mix settings again to see why I can't get equal positive and negative pitch in stunt mode.
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04-27-2011 02:32 AM  10 years ago
dkshema

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Cedar Rapids, IA

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not sure why you're changing swash mixing. adjust your servo travels to 125-150% for cyclic H & L.
Wrong, bad, and incorrect advice from someone who does not understand what CCPM mixing does, or how the radio is used to make it work properly.

That is NOT the way to control overall travel in a CCPM head setup. Following that path will lead to you a heli that flies poorly and one that is not properly built.

-----

Richard on the other hand, is on the right track, but here's a way to make life a whole lot easier in the mechanical setup realm. Set all trims and all sub trims to ZERO.

THEN make a pitch curve of 0 - 50 - 50 - 50 - 100 (assuming 5 point curve). You get a big flat spot such that as long as the collective stick is anywhere in that flat spot range, your servos should be centered and you should then be able to play with the position of the servo arms on the splined shaft to get as close as possible to the proper geometry. THEN use sub-trims to get that all important centered at neutral servo arm.

The big flat zero degree setting spot makes setup very easy, as you don't have to be extra precise about setting that throttle stick exactly at the 50% setting each time you move it to adjust something.

With the stick in that same big flat spot, you should also be able to adjust the rods supporting the swashplate to be level, and put the swashplate midway through its overall up/down travel range. You should then also be able to adjust all the head pushrods to get the various levers horizontal and parallel to the swashplate, AND then you can adjust the individual blade pitch to ZERO degrees.

Mid stick, neutral, everything level and centered, zero degrees pitch, and the possibility of having differential control movement over the entire control range is eliminated.

With all THAT done right, move the stick to the full low position (that 0 on the pitch curve you made), and you can measure the total amount of negative pitch you'll have. Then, move the stick to full up (to that 100% part of the curve you made) to measure the full positive pitch range you'll have. If you did everything right, you'll have equal amounts of positive pitch and negative pitch, and mid stick will yield zero degrees pitch.

If you need more overall collective pitch travel, make the PITCH number in the SWASH MIX menu numerically bigger (closer to 100). If you need less overall pitch travel, make the PITCH number in the SWASH MIX menu numerically smaller (closer to zero).

While you have that big flat spot you can also measure your aileron and elevator cyclic pitch, and shoot for about 6 - 7 degrees. Adjust THIS value using the AILE and ELEV numbers in the SWASH MIX menu. Numbers closer to zero decrease overall cyclic pitch, numbers closer to 100 increase overall cyclic pitch.

With all the mechanical stuff out of the way, and the proper servo travel fixed, use a pitch gauge to set your desire pitch curves for all flight modes.

-----

With a CCPM heli, you don't adjust the individual channel endpoints to increase or decrease pitch, aileron, or elevator travel. You use the endpoints to make sure that your swashplate stays level from full negative pitch to full positive pitch, and anywhere in between. If one servo travels a bit further over the pitch range than the other two, adjust the endpoints on that channel to equalize overall servo travel.

-----

This post

https://rc.runryder.com/p4325158/

will tell you how to setup the radio, how to get the correct zero degrees setup done, and will tell you about what changing endpoint values do, what the swash mix values do, tells you how to mearsure and set cyclic pitch values, and has a link to a gyro how-to post.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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04-28-2011 07:35 AM  10 years ago
ntec

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Winnipeg, Canada

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thanks dkshema followed everything you said and also put servo travel back to default settings. I now have equal positive and negative pitch.
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04-28-2011 03:05 PM  10 years ago
Newbe Guy

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Phoenix, AZ

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@ ntec...

How many degeres did you get pos. and neg.? Im just curious to know what I can expect to have/get. Thanks.
Blade mSR / Trex 450se V2 - AMA#965156
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04-28-2011 03:10 PM  10 years ago
Richardmid1

rrProfessor

Leeds, England

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+/-11 should be all you'll need on a Trex 450, you can get more but you have to start trading it for cyclic, i.e. you could get +/-13 but you would have to limit your cyclic pitch to prevent binding.60% of the time, it works every time!
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04-28-2011 03:26 PM  10 years ago
ntec

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Winnipeg, Canada

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I got +/- 11 pitch just like richard pointed out.
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