shakein thar ass

[richieclarkie]

Actually Simon I suggested those curves on the basis he has been flying a while now. He has a miniPred and a Twister. I also believe someone learning with reduced negative pitch will get in bad habits too and it takes longer to get out of them. Personally I learned with a full pitch curve and I had no probs. "Old School" is OK it just takes longer IMHO.

But what do I know

[SimonN]

"But what do I know" - actually Ritchie, in all honesty, probably a lot more than me!!


One thing this shows though, there's always more than one way to do things, and opinions will always differ. Incidently, I also find it easier to fly with a "full" pitch curve even though I don't do "proper" 3D
Are you suggesting I learnt "old school" ???

Simon

[reg]

thanks for your replys chaps,i think im going to have another read and understand things a bit more,then sit down and go through it and see what im doing,iv been out in the garden and its hovers nice now,but i dont know as what people have said weather its right or just fluke,i set the head up with a bit of mmmmmmmm that looks ok,but iv got more pitch on one side at half stick than the other,if i undo the little links that are attached to the blade grips and turn it it goes from the left having more to the right having more,i cant find anywere that shows how to set the head,finnless says im going to move this up be back in a min,when he comes back its all done,it doesnt show you him doing it and what to look for,if only i had started this hobby when i was 10
mark

[richieclarkie]

Simon I'm sure you aren't "Old School" Plenty of ways to skin the cat!

When I'm setting up I keep things REALLY simple. I aim to get everything setup mechanically right and then use my radio to damp things down. No special curves of any kind.

With CCPM it's important that at mid stick everything should be at 90° or in line. If you go by the manufacturers lengths on the TREX 450 V2 they are quite close and then you can correct them from there. The reason for this if any of the angles in a CCPM setup are not the same then the heli will have wierd tendencies to wander off (more than they do anyway!)

Work from the bottom up and get all the servo angles at 90 at midstick etc.

[reg]

this is were i am at the mo,the gyro is pluged into the gear channel delay on 55,the gyro limit on 140,on the DX7 iv got gyro sense on auto,the rate on 72 and 72,the swach mix is aile -35,elev +35 pit +46,travel adjust 100% on all except rudder witch is L85% R110%,sub trim aile L41%,eliv U13% pit L14%,this means nothing to me,but can someone see if this looks like its hiding somthing,im off most of tomorrow so i think i will look at the head,i know its not right but i dont realy know what is wrong
mark

[SimonN]

Mark,

I'm not too familier with the DX7 settings, I'm a Futaba man myself. But, a couple of things jump out at me.

Firstly, the travel adjust on the rudder. This is normally used to adjust the piro rate, not how far the slider moves. Set it to 100% in both directions and use the limit pot on the gyro to adjust how far the slider moves.


Secondly, sub trim. It's not the end of the world, but have you tried rotating the servo horn 90 degrees at a time because the splines are off set so the arms will be in a slightly different position each time? See if you can get rid of the sub trim, or cerainly reduce it (on the aileron in particular). Then, do as Richie says, set everything at 90 degrees at mid stick.

Sorry, rest of your radio settings don't mean much to me, maybe a DX7 or JR owner can help you here..

Simon

[reg]

thanks simon,i will have a look at the horns

[jamiem]

im on a dx7 with a 450se v2 and a 401, ask away

[reg]

hi Jamiem,do your settings look anything like mine in the post on this page,i cant realy ask anything as i dont know what to ask

[jamiem]

like has already been said, id re-do your servo arms to get them all at 90degrees at mid stick (use the monitor screen on the dx7 to ensure all the shannels (bar throttle) are at mid). then try and reduce the sub trim levels, then ditch the gyro screen and use the end points of the gear channel to adjust gyro gain. To do this you must go in to the model setup menu and assign gear to gear instead of gear to gyro. this then lets you flick between hh and rate mode at the flick of a switch (the taller of the 2 left hand toggle switches). i think ive got my high end point at about 45, not ever used rate mode so not set it up.

Jamie

[wazzer]

this is were i am at the mo,the gyro is pluged into the gear channel delay on 55,the gyro limit on 140,on the DX7 iv got gyro sense on auto,the rate on 72 and 72,the swach mix is aile -35,elev +35 pit +46,travel adjust 100% on all except rudder witch is L85% R110%,sub trim aile L41%,eliv U13% pit L14%,this means nothing to me,but can someone see if this looks like its hiding somthing,im off most of tomorrow so i think i will look at the head,i know its not right but i dont realy know what is wrong
mark

Hi Reg it looks to me like you need to zero all your subtrims and trim and re set all your servio arms to 90 degrees. I do this then set a linear pitch curve 0,25,50,75,100 then make sure you have all the linkages level or at 90 and 0 degrees pitch at center stick.
Once i have the heli set up mechanically making sure i have all the movement i want and no binding i then start to set my pitch curve.

I am a complete beginner so am just hovering around in normal mode at the moment.

I also prefer to hover at mid stick as opposed to 3/4 like some people,
So i set the collective stick to the mid position and then set the pitch gauge to 5 degrees positive. I then adjust the mid point of the curve to acheive the 5 degrees of pitch i need to hover.

Then i set the low stick pitch to about -4 degrees and the top stick to about +8,9 degrees.
i then smooth the curve so it is reasonably flat in the middle of the curve.

Check out Pete Christy's explanation in the set up forum the basic principle of what your trying to achieve is there.

The throttle curve should also be a similar shape the idea is that you don't want any large changes in pitch or throttle when you are trying to achieve a nice stable hover you can make all the controls much more sensitive in Idle up 1 2 3 etc
This is just about setting up to hover in normal mode.

The theory is to get the mechanical set up perfect then change the flight characteristics with the pitch curves as and when you need to


Hope this helps

Ben

[reg]

thanks for all this very helpfull advice,im going to set to and sort out the trims,i will post how i get on,
thanks again for all your help everyone
mark

[reg]

hi,iv moved the servo horns and now have no trim or sub trim and its fairly still in the hover,iv got rid of the 110-85 on the tail,iv put them back at 100 and turned down the limit on the gyro,it now travels without banging eather side,iv set the delay on the gyro to zero,the only thing im not to sure about is what jamiem said, iv done what you sugested and changed the gear back to gear,when you say you have your high end at 45 do you mean go into the sub trim go to gear and adjust the value to +45(would minuss be the setting for none HH)if this is correct what will happen if i go higher or lower(+35 or +65),im just trying to under stand what the things do
thanks
mark

[richieclarkie]

On the gear channel you need to go to the Travel Adjust (not sub trim) screen and flick the gear switch to the up position. Then set it to 45 I find mine needs to be nearer 55 so you may need to change. Too low and the tail won't hold very well paticularly if you climb or decend quickly. Too high and the tail will wag.
With the Gear switch at the bottom position the gyro is then in rate mode and you can set the value of that around 45 no probs.

[reg]

thanks richieclarkie,iv just gone into that and it was set at 110
do you think that is the answer to the post heading (shaking that ass)