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Home✈️Aircraft🚁Helicoptere-AlignOther › having trouble keeping a steady altitude?
07-21-2006 02:05 AM  14 years ago
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joecass

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having trouble keeping a steady altitude?
would converting my hde 450xl to ccpm help with this problem? i was thinking since the pitch controls are more direct than hde. i have been flying my trex since november and can hover in all directions and can do fast figure 8s banking in the turns. but now i am trying to fly some slow circuits with the heli at about waste level and just can't seem to mantain a steady altitude. in forward flight it seems to be ok. was also thinking about trying the 400 fly bar paddles. what do you guys think?
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07-21-2006 02:42 AM  14 years ago
Jon the Rooster

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Johns Island, Charleston, SC

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What's your head speed? When I increased my headspeed the whole heli becomes more stable!and one more thing "DON'T BE AFRAID!"
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07-21-2006 02:50 AM  14 years ago
Gary Jenkins

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Nowhere, US

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When you make a turn it climbs? You have to decrease the pitch to maintain the altitude, which just takes practise.
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07-21-2006 02:50 AM  14 years ago
ormandj

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Kaneohe, Oahu - Hawaii

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HDE vs. CDE should make no difference in stability. BOTH are CCPM. One is mCCPM and one is eCCPM. Could be something bent or loose, or poor tracking of the blades/poor balancing of blades/blade cgs, bad collective management, wind, a dog barking, etc. Too many variables, not enough info!
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07-21-2006 11:21 AM  14 years ago
Planehazza

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Newcastle, England

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HDE vs. CDE should make no difference in stability. BOTH are CCPM. One is mCCPM and one is eCCPM.
OOOOOHHHHH, bad juju! Don't let Finless hear that! LOL
As far as they know, I already had it!
T-Rex 450 XL HDE with metal upgrades
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07-21-2006 04:26 PM  14 years ago
c mark smith

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Mt Vernon, Indiana

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Finless again,,,,,,,,,,,,,

I'd check for tight links and balls that are not round/polished

After I got a link sizer took, I could put together a great flying HDE out of the box first time.

Smoothness will come after many, many flight hours which will 'breakin' the linkages.

But for nice smooth flying first flight, get the tool for sizing the links.

BTW, the CF frame for the HDE is one nice piece of work, and greatly stiffens the collective.

Problem with the CCPM version, and I think eberyone knows which one I mean, there are three servoes and three servos offering up slack in their gear trains to create a sticky collective.
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07-21-2006 07:33 PM  14 years ago
AlanR8

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High Crompton, Manchester. UK

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All of the above, but it comes down to co-ordination and ANTICIPATION of what the next move will be.

You don't say what tranny you use, but most decent trany's have a 5 point pitch curve. What you could try is flattening the pitch curve across the hover point.

This is what I mean.

Say you hover at mid stick at 75% on the pitch curve and your curve looks a bit like:

30%, 55%,75% 87% 100%

This would be giving about -4 degrees at the bottom, about 5 degrees in the middle and say 10 degrees at the top.

If you increased point 2 to say 70% and decreased point 4 to say 80%, the effect would be to "desensitise" the pitch about the hover position thus making the stick less sensitive.

Does that make sense?
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07-21-2006 10:58 PM  14 years ago
gkoutsis

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Athens Greece

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BOTH are CCPM. One is mCCPM and one is eCCPM
There is no such thing as mCCPM. How many times do we have to say that?

Repeat after me..... There is mechanical and CCPM. THATS ALL!
George
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07-21-2006 11:52 PM  14 years ago
joecass

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thanks guys for all the input. this is my set up. 325 pro blades black and white, 420LF motor, 13th pinion gear, 35amp align esc, 2100mah tp battery pack, metal align main rotor hub, CF tail boom, 401, s9650 on the tail, heli up gear box only, hs 56 hb, dx6 as my radio, and gorilla skids. my pich curve is 0 50 100 i have 10 degrees full + and - my throttle curve is 0 80 100. not too sure about head speed accoording to my mini tach im running 3200 but i don't think that is accurate, i think im lower than that.

AlanR8 that makes sense but how would i do this with the dx6 with 3 pitch curve points.


Gary Jenkins it seems to yoyo no matter what. but yes i do notice that when taking turns it will climb so then i will counter it and then it will go to low and it seems like there is a lot of lag time from when i add negative pitch to when the heli reacts. but there is no lag whatsoever with any other input. it just seems that way with pitch.

c mark smith you think the cf frame will help? thanks. i did use a ball link sizer when i put my trx together. if i can move the plastic ball link socket in and out on the ball but not up and down is this considered too loose

thanks for all the help.
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07-22-2006 12:39 AM  14 years ago
ormandj

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Kaneohe, Oahu - Hawaii

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There is no such thing as mCCPM. How many times do we have to say that?

Repeat after me..... There is mechanical and CCPM. THATS ALL!

George
You can say it as many times as you'd like to say it. It still doesn't make it true.

http://www.iroquois.free-online.co.uk/ccpm.htm

First link in google for "CCPM". CCPM of course standing for "Cyclic/Collective Pitch Mixing" which is performed by BOTH mechanical and electronic methods.
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07-22-2006 01:00 AM  14 years ago
gkoutsis

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Athens Greece

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I am too bored to go into this discussion again.....

It has been brought up so many times. It leads nowhere....
George
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07-22-2006 03:36 AM  14 years ago
joecass

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NJ

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i am using fixed and it only has 3 throttle curve. i will try using gov mode thanks willy
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07-22-2006 03:43 AM  14 years ago
menace

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Sydney, Australia

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joecass,

i have a HDE and i found the same problem but if you put your headspeed to 2800-3000 and pitch crv to -9,-4,0,+4,+9
that should smoothen that out a bit and increase and alter to suit.
!boo!
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07-22-2006 01:56 PM  14 years ago
joecass

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NJ

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im going to try gov mode first. when using gov mode how should my throttle curve be set up also can i run the 325 pro blads that fast 3000?

im flying with just using my thumbs and no neck cord is this ok?
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07-22-2006 04:42 PM  14 years ago
joecass

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ok i just got back from flying my head speed is at 2700 runing gov mode throttle cuvers is set to 0 95 95. i can't seem to get the blads to keep track. i can set it but it will not hold after flying for a while the tracking will go out.
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07-23-2006 03:26 AM  14 years ago
joecass

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thanks willy it was raning all day today so i didn't get a chance to fly it. but i spent most of the day working on it and running out to the lhs to by some new align 325 carbon fiber blades i also replaced all my ball links i think when i put this heli together i over sized my links. i will try it tomorrow and post back thanks willy for hanging with me through this problem.
joe
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07-23-2006 08:14 PM  14 years ago
joecass

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Thanks guys my heli is flying much beter now.I replaced the ball links and it fix my tracking problem. gov. mode and rasing my head speed seem to help a lot with my altitdude problem.
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