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Home✈️Aircraft🚁HelicopterThunder TigerOther › R90 With Titan Push/Pull
01-25-2007 04:53 PM  12 years ago
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colsy

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Cambridge, UK

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R90 With Titan Push/Pull
Worthwhile and (very) cheap, addition i thought id share.

Very easy to do with a little workout with your Dremel.

This has Substantially improved my linkage accuracy from the swash down, requiring little effort.

Colin.
Only Quote From Experience.
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01-25-2007 08:05 PM  12 years ago
blakka_1

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London/Enfield

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Nice mod.
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01-25-2007 08:12 PM  12 years ago
Mark C

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Houston, TX - USA

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Awesome! I just wish you didn't have to run the tail mount for the rudder servo to have the collective PP.
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01-25-2007 08:27 PM  12 years ago
blakka_1

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London/Enfield

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Awesome! I just wish you didn't have to run the tail mount for the rudder servo to have the collective PP.
Yeah, that's the only reason I don't use PP. It's a shame.
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01-25-2007 08:33 PM  12 years ago
colsy

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Cambridge, UK

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Well boys ive found a way round it on the 50's, i will post the results next week.

And i think its possible on the 90 aswell.

col.
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01-25-2007 08:41 PM  12 years ago
blakka_1

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London/Enfield

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Looking forward to it.

Cheers
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01-26-2007 02:07 AM  12 years ago
Willie 300S

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Birmingham, Al, USA

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I have an idea I may try this weekend to have our cake and eat it too; a front mounted tail servo and the push pull collective on the Titan:
Put the collective servo in the second position down, just below the elevator servo (same as on a V2).
Locate the push pull arm in the third position down below the collective servo.
Orient the collective servo wheel toward the rear so the push pull arm connection to the tray is towards the front. It will line up perfectly with the front connection point on the tray.
Both the collective servo and push pull arm should be spaced out somewhat. This will provide a more vertical connection to the tray and provide more space behind the push pull arm to mount the tail servo in the normal V2 position.
All of the control rods nessary to do this are in the Titan kit except for the longer rod required between the push pull arm and the collective tray.
The tail servo and collective push pull arm would be mounted back to back so some type of through bolts will be required.

Has anyone tried this?
Does anyone see a problem with this arrangement that I haven't seen?
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01-27-2007 09:19 PM  12 years ago
carlyle

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Stratford, Ontario, Canada

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Colsy. Shouldn't your push pull rods be the same distance from the pivot? meaning, it looks like your rods are 30mm apart on the leaver, and 10mm apart on your servo arm... How does this work without binding?
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01-27-2007 09:21 PM  12 years ago
carlyle

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Stratford, Ontario, Canada

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Also, those look like the ace 1015 servos. if they are, you can run WAY less travel, and put your ball links much farther out on your servo arms... this will give you a much faster response. I run a 1015 on my 90SE's collective, and I run 78% travel with NO torque problems.
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01-28-2007 03:25 AM  12 years ago
uragem

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Indianapolis, IN - USA

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Less travel. Less resolution.Indy Jeweler
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01-28-2007 03:40 AM  12 years ago
Jason Bell

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California

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Ive gotta see this, it sounds VERY promising. Im gonna watch this thread like a hawk!AMain.com
Mikado "V Team"
Xnova Motors
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01-28-2007 05:21 AM  12 years ago
NORTHERNLIGHTS

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Riverview FL

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Bolt on NO adaptable YES works great.B.O.A.T. Break Out Another Thousand!
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01-28-2007 01:52 PM  12 years ago
S Bell

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Nova Scotia Canada

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Like Carlyle says it works well and the servos have ample head room with this geometry both for rez and torque. Here's a pic of an extended servo arm to increase collective acceleration. The servo again has plenty of oomf and is not over tasked. These servos are ideally suited by design for high speed, high throw applications.

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01-29-2007 02:27 AM  12 years ago
carlyle

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Stratford, Ontario, Canada

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Hello Steven.

I was talking with Colin the other day, and I got him to send me some of the dubro servo arms for my new 1015 servo. They are a high quality arm. I'm using them on my collective servo now, and I beleive there around 18 or 19 mm out. It's maybe something that could be used, rather than making a servo arm. I don't know though. I'm running 78% travel with my 10X radio. Keeps my collective nice and fast .

-Car
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01-29-2007 02:59 AM  12 years ago
S Bell

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Nova Scotia Canada

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18mm should do the trick, I remember Colin mentioning this but have not seen the arms personally. Sounds like you approve of the dubro structure. You know what it's like working at home using whatever one can get their hands on

Stephen
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01-29-2007 06:05 AM  12 years ago
BJames111

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San Diego, California

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doesn't reducing atv servo travel ruin the resolution of the servo? I was under the impression that it was much better to run it at 100%
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01-29-2007 08:30 AM  12 years ago
carlyle

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Stratford, Ontario, Canada

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doesn't reducing atv servo travel ruin the resolution of the servo? I was under the impression that it was much better to run it at 100%
This is still kinda new to me. I've only got around 15 or 20 flights using this method, but I didn't notice a difference at all, other than my servo's are much faster. I know colin has been doing this for a while.

Think about it this way, if you decrease your travel down to 50%, you still have 512 bits of resolution in your radio.

Another thing to remember... The servos have there own resolution built into them, they just receive a signal from the receiver, but the servo has to do there own computing for the output.
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01-29-2007 02:04 PM  12 years ago
S Bell

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Nova Scotia Canada

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The guys running eCCPM use way less servo rez per control axis. Think about it two or more control axis (cyclic/collective) can share one servo travel or resolution using long servo arms. You could have fore/aft, roll and collective commands going through a single servo lead. Raptor collective looks pretty good for servo rez even with a long servo arm eh?

Stephen
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01-29-2007 02:25 PM  12 years ago
colsy

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Cambridge, UK

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My coll, ATV'S are 83% even, with the titan set-up. yielding Total coll travel of 25/26 degrees.

Elevator linkage is 100% all @90 degrees, the photo is deceiving.

Using the Titan Elevator arm, limits the servo arm points to 21mm, if you go out further to reduce rez, then the links do-not follow.

colin.
Only Quote From Experience.
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01-29-2007 03:05 PM  12 years ago
S Bell

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Nova Scotia Canada

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Colsy,

The collective is really the axis some people want to speed up. With the stock 90SE you can get everything down to the high 60s-mid 70s, if you prefer it that low. It flys fine like that even without the push pull fore/aft and collective. Good servos seem to hold the stock SE system in any commanded position. I do like what you've done with the linkages though.

Maybe some offset on the servo wheel?
I wonder if you could relocate the ball inboard on the metal fore/aft arm near the mast a few mm?You'd have to try it to see if any obvious interaction is created with collective movement.

Stephen
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