Initial pitch setting

[CH47quest01]

I’m in the middle of setting the pitch for the blades, but I have a question.
I found the attached in the Hurricane manual but somehow it doesn’t look right. Should I use this chart or should I use; (with the throttle set at mid stick the blade pitch is to 0 degrees. With throttle at full stick the blade is set at +10 degrees. With the throttle set at the lowest setting -10 degrees.) I’m not sure what to do. Can you please help?

[Sircrashalott]

I’m in the middle of setting the pitch for the blades, but I have a question.
I found the attached in the Hurricane manual but somehow it doesn’t look right. Should I use this chart or should I use; (with the throttle set at mid stick the blade pitch is to 0 degrees. With throttle at full stick the blade is set at +10 degrees. With the throttle set at the lowest setting -10 degrees.) I’m not sure what to do. Can you please help?

If you are new to helis don't use -10 on the low side.....you can literaly smash your heli in the ground.......-2 is plenty to bring it down....- 10 is for inverted flight in Idle up mode

[mysticmead]

what I set mine up initially was... NORMAL mode: low stick -3 mid stick 0 high stick +10
Idle: -10 , 0, +10

[CH47quest01]

So the pitch setting should be something like this;
Full stick +10
Mid stick 0
Lowest stick setting -3.
This leads to another question, there are only two adjustable links, one on each side of the head that can be adjusted. Would I use those two links to adjust full, mid low throttle blade pitch settings.

[mysticmead]

if you setup your heli properly and have the servos at 90 degrees and have the swash plate level... then you should by default have 0 degrees at mid stick. adjust the low stick and high stick in the radio...by adjusting the pitch curves.

[mjdee14]

Most people use zero at mid pitch.....

let say you use -3 for low side, 0 at mid and +9 for high side.....you genaerally hover about 6-8 deg of positive so your pretty much at 3/4 stick....you have 9 deg between mid and high and only 3 deg between mid and low.....it can make the heli feel twitchy or sensitive when learning to hover....small changes in the stick will have big reactions.

when you use the 3 deg at mid and 9 at high...you only have 6 deg to play with so stick movements don't have as big a reaction. it helps some people get used to the heli better.....

I like the zero in all 3 modes better myself, but I can understand the reason for the +3 at mid.

[Mikej]

I’m in the middle of setting the pitch for the blades, but I have a question.
I found the attached in the Hurricane manual but somehow it doesn’t look right. Should I use this chart or should I use; (with the throttle set at mid stick the blade pitch is to 0 degrees. With throttle at full stick the blade is set at +10 degrees. With the throttle set at the lowest setting -10 degrees.) I’m not sure what to do. Can you please help?

You will find that pitch curves are a very personal thing. What I do is set up my mechanical settings so the I have 0 degrees at half stick -10 at zero stick and +10 at full stick, I then use a pitch curve to give about -30 at zero stick, about 4 or 5 degrees at half stick and +10 at full stick - this gives hovering at just over half stick (about 60%). It works for me as a relative newby

[Pinecone]

Since you are new, you set up the head to give the +/-10 at full travel, then set up a pitch curve in Normal flight mode to give you less negative pitch for starting out.

I run a pitch curve of about 40 - 45 - 50 - 75 - 100 in Normal. This give -2 degrees of pitch at full low stick. This allows me to come down even in the wind, but to not drive the heli into the ground if yo upanic and dump the stick.

I run a 0 - 25 - 50 - 75 - 100 pitch curve in Idle up. And I feel it is best to learn quickly to move to Idle up and use the Throttle Hold to bail out, not low stick.

See the Finless Tech Room Basic Skills 1010 thread and watch the CCPM 1 and 2 vidoes and the Throttle/Pitch Curves 101 video.

[backwall]

Just a followup question. I had my swash levels set intially for 50, 50, and 50. When i went to idle up, My pitch went from about -14 to +14. Maybe, I need to read my pitch guage better. To reduce the pitch a bit I backed down my swash setting. I also end up reducing my aileron and pitch swash settings a bit to cancel out any interactions at zero and full collective. Are you saying I could have adjusted my collective instead using something like 10, 25, 50 ,75, 90 to reduce the pitch a bit. When both ends are off a little (say -14+14 and I really want -12+12), is it better to adjust swash level or the pitch curve?

Dave

[Sircrashalott]

Just a followup question. I had my swash levels set intially for 50, 50, and 50. When i went to idle up, My pitch went from about -14 to +14. Maybe, I need to read my pitch guage better. To reduce the pitch a bit I backed down my swash setting. I also end up reducing my aileron and pitch swash settings a bit to cancel out any interactions at zero and full collective. Are you saying I could have adjusted my collective instead using something like 10, 25, 50 ,75, 90 to reduce the pitch a bit. When both ends are off a little (say -14+14 and I really want -12+12), is it better to adjust swash level or the pitch curve?

Dave

your swash mix is for your cyclic pitch not collective pitch.....

not sure what radio you have but on a dx7 in the throttle curve menu 50 should be 0 degrees pitch (half stick), you confirm this with a pitch gage...

therefore your pitch curve will look like this in normal mode 40-45-50-75-100

40 should be around -2 to-3 degrees.....then at full stick 100 should be +10 to +12 depending on your setup....if this is too much put your pitch gage on your blade and set ithe gage for desired pitch and back down the top # till your pitch gage is level...usually +10 degrees will be around 90-95...again depending on your setup some get +10 at 100

hope this helps

[mjdee14]

If the swash numbers are too high you will get binding when the sticks are in the corners and you at max + or - pitch..... you also adjust the swash #'s if you have too much aileron or elev throw. You check that by having the main blade fore & aft or side to side. with the pitch gauge on the main blade....when you move the right stick for al or el the blades will change pitch...whichever one moves the blade....take the reading....then rotate 90 deg side to side and try the other control...it will change the pitch....those readings are your ail & elv throws....adj swash settings for what you want....most go 6 -8 deg.


Mike

[Mikej]

your swash mix is for your cyclic pitch not collective pitch.....

not sure what radio you have but on a dx7 in the throttle curve menu 50 should be 0 degrees pitch (half stick), you confirm this with a pitch gage...


On my DX7 and 6EXH the Pitch setting of the swash settings affects the collective pitch.

[Sircrashalott]

Just a followup question. I had my swash levels set intially for 50, 50, and 50. When i went to idle up, My pitch went from about -14 to +14. Maybe, I need to read my pitch guage better. To reduce the pitch a bit I backed down my swash setting. I also end up reducing my aileron and pitch swash settings a bit to cancel out any interactions at zero and full collective. Are you saying I could have adjusted my collective instead using something like 10, 25, 50 ,75, 90 to reduce the pitch a bit. When both ends are off a little (say -14+14 and I really want -12+12), is it better to adjust swash level or the pitch curve?

Dave

sorry I miss read your question.....but yes use you pitch curves to adjust collective and swash to adjust cyclic....

double check your pitch gage -14 +14 seems like alot....but if it is correct in idle up mode pitch curve settings change your high and low # to get the pitch desired

[Sircrashalott]

On my DX7 and 6EXH the Pitch setting of the swash settings affects the collective pitch.


You are correct I forgot about that......I only mess with ail and ele in swash menu.after the head is setup...:thumbup:

[backwall]

I messed with all three. Aileron and elevator to get rid of interactions and (collective) to reduce my blade pitch throws. As I recently had an incident with my flybar which cost me my paddles, tail blades and flybar--not to say a chunk of my arm, I tore my head down and built it back up. I think I'll return all my levels to 50 and make my adjustments over again. Can't be too cautious--I've invested too much $$ in this heli.

Dave

[Pinecone]

1) Adjust the Pitch Swash Mix to the maximum desired pitch range. For a beginner +/-10 would be fine. As you advance, just dial up the swash mix to the max.

2) Use your pitch curve to adjust you low pitch in Normal mode. Idle up should run a straight linear pitch curve (0 - 25 - 50 - 75- 100). Yo ucan also use the pitch curve to dial in a little S curve if you want.

3) The Aileron and Elevator Swash Mix values set the maximum for those controls. 6 degrees on each if a good beginner start, up to maybe 8 degrees when you get more agressive with your flying.

4) YOu will have to do some limiting of the max swash mixes to avoid binding in the corners. But really, if you have +/-14 collective and 8+ of aileron and elevator, if you are in the corner with the stick, you are already in BIG trouble. :)

5) You dial out INTERACTIONS with servo end points. See the Finless CCPM 2 video for guidance. For a beginner, it isn't really a big deal as you are not using the extremes anyway.