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HomeAircraftHelicopterThunder TigerRAPTOR 50 › Titan: push-pull collective servo and pitch lever
03-09-2008 09:52 AM  10 years agoPost 1
meowsqueak

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New Zealand

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I'm having real trouble interpreting the instruction manual when it comes to the pitch servo, pitch lever and pitch lever fixed plate.

I think it indicates that the servo goes in the second slot from the bottom, with the 'driveshaft' towards the nose. Then the fixed plate goes above this, but I can't see which of the two holes the pitch lever is meant to pivot on.

If the link between the pitch lever and the collective pitch control arm is meant to be almost vertical, then it seems to me that the pitch lever needs to be on the second hole (closest the main shaft), but that would indicate the servo should go in the other way, with the driveshaft nearest the main shaft too.

Has anyone got a proper diagram or a good photo showing how this should be set up please?

I have this photo here, which makes sense if the ball is on the inner hole on the collective pitch control arm, but by default it's on the outer hole, and I can't see how this could work unless I move this ball.

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03-09-2008 10:06 AM  10 years agoPost 2
Funky Trex

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Westerville, OH - USA

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I use the inner hole on my Raptors. It makes it easier to get the full pitch range.

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03-09-2008 10:09 AM  10 years agoPost 3
meowsqueak

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New Zealand

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Do you know what the trade-off is when using the inner hole? Is it tougher on the servo? I have a 9252 - should be OK using inner hole?

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03-09-2008 10:10 AM  10 years agoPost 4
Funky Trex

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The inner hole lets you get more pitch with less servo travel. I used 9252s for a while and they worked great with the inner hole.

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03-09-2008 10:38 AM  10 years agoPost 5
meowsqueak

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New Zealand

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Do you find that the collective servo horn is quite far behind the vertical plane flush with the pitch push-pull lever? My links lean outwards a fair bit as they go up from the servo.

I have the servo blocks (spacers) behind the grommets but it still seems to sink into the recess a fair bit.

It seems to me that if the stand-off that the pitch push-pull lever pivots on was removed (filed off) then the surfaces would be flush.

Or have I done something incorrectly?

EDIT: about 5mm further back

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03-09-2008 10:48 AM  10 years agoPost 6
Funky Trex

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Westerville, OH - USA

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Mine sits back a little too, although I don't know if its quite that far. I would double check everything to make sure it is assembled correctly. I used to run 9252s and never had a problem. These are 9351s I am running now.

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03-09-2008 11:00 AM  10 years agoPost 7
meowsqueak

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New Zealand

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That photo is really useful - thanks!

I see what I've done wrong, I have the "pitch lever fixed plate" backwards - the two 'standoffs' are meant to face into the slot, not outwards!

Thanks for your help.

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03-09-2008 11:08 AM  10 years agoPost 8
Funky Trex

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Westerville, OH - USA

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Anytime Have fun with your Raptor.

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03-09-2008 11:57 AM  10 years agoPost 9
Drunk Monk

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Preston, UK

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What's the deal with that big foam pad at the front funky?


Stephen

I only open my mouth to change feet.....

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03-09-2008 01:57 PM  10 years agoPost 10
BarracudaHockey

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Jacksonville FL

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Discard the push pull.

Flip the servo opposite what the book shows and move it up one hole.

Use a round wheel for maximum stiffness.

You want to use the hole on the arm thats towards the main shaft.

Put the rudder servo in the nose since you now have a free slot.

Where did you get a 9252 with metal gears?

Andy
AMA 77227
http://www.jaxrc.com

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03-09-2008 03:08 PM  10 years agoPost 11
jschenck

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La Vista, NE.

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I agree, get rid of the PP collective and put the tail servo up front. I ran the PP for a year on my Titan, switched a year ago. Collective response is the exact same but the tail servo is protected up front and I can run a lighter battery pack. Sorry about the fuzzy PP picture, it's the only one I found.

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03-09-2008 03:38 PM  10 years agoPost 12
Funky Trex

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Westerville, OH - USA

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What's the deal with that big foam pad at the front funky?
The foam pad was just a quick/simple solution for mounting the electronics when I was trying to throw everything together at 3AM for flying the next day. There are a bunch of electronics on this heli and I needed a quick solution for mounting them all so I could get some sleep. I was going to change it to something better after that day, but after some guys at the field made fun of it, I keep it for the laugh factor

I agree about the tail servo. Mine gets drenched with fuel in the back. I keep meaning to change it, but I never get around to it. Another solution is to run the push-pull setup below the collective servo. I saw a Titan recently that ran it like this and it worked great.

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03-11-2008 04:07 AM  10 years agoPost 13
meowsqueak

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New Zealand

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Moving the tail servo to the front sounds like a good idea - in this case I set it up like the V2 manual says?

(Presumably this uses the left-over parts in my Titan kit, like a couple of long pieces of steel)

That photo isn't mine - I borrowed it from some site somewhere to illustrate my point. That servo is a 9255 by the looks.

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03-11-2008 05:29 AM  10 years agoPost 14
meowsqueak

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New Zealand

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Does anyone have a photo specifically of this modified servo arrangement please? I'd like to see exactly how the rudder servo is mounted at the front, and I also would like to see details of the linkage between the servo and the tail assembly.

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03-11-2008 05:32 AM  10 years agoPost 15
jschenck

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La Vista, NE.

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03-11-2008 05:34 AM  10 years agoPost 16
Funky Trex

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Westerville, OH - USA

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Here are some pics from my 30

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03-11-2008 07:59 AM  10 years agoPost 17
meowsqueak

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New Zealand

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Thank you very much jschenck & FunkyTrex - great photos.

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03-11-2008 09:01 AM  10 years agoPost 18
meowsqueak

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New Zealand

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BarracudaHockey:

"You want to use the hole on the arm thats towards the main shaft."

I don't quite understand this sentence, would you please explain?

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03-11-2008 01:10 PM  10 years agoPost 19
Swoop

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Newark, DE USA

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I hope I'm not speaking out of turn but i think BH is referring to the other ball mounting location on the collective arm. I also agree to get the tail servo up front and do away with the PP on the collective. Your Titan kit comes with all the necessary hardware to do so.

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03-11-2008 03:10 PM  10 years agoPost 20
BarracudaHockey

rrMaster

Jacksonville FL

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Yep, on the collective pitch arm, run the ball in the hole closest to the main shaft, just like the picture shows. I'll take a few pictures when I get home from work and post them for you.

Andy
AMA 77227
http://www.jaxrc.com

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HomeAircraftHelicopterThunder TigerRAPTOR 50 › Titan: push-pull collective servo and pitch lever
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