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Home✈️Aircraft🚁Helicoptere-AlignT-REX 450 › Too much travel on my washout block
08-06-2007 03:28 AM  13 years ago
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Occusus Morsus

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Hobart, Tasmania - Australia

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Too much travel on my washout block
Hi all,

I'm putting together my Trex 450 SE v2 and i've setup the suggested head linkage lengths and then modded the three at the bottom which connect the servos to the swash to get the swash level. I have placed the links 13mm out on the servo arm as recommended. But now it looks like my washout block moves too far, at full positive the washout block hits the top and at full negative the swash plate is kissing the collar just above the frame.

The Servos are HS-65MG's with an Optic 6 Radio, all trims and EPA's at 0 and 100% respectively. It looks like i will have to start my pitch curve at 10% and end at 90% has anyone else had to do this?? Have i missed something somewhere?

Thanks,
Jefff.
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08-06-2007 03:52 AM  13 years ago
Dynamic^Cipher

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Kelowna

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On your radio lower your pitch setting on your swash mix menu. This will limit the travel of your swash.Full metal 600 1515/2.5d CC110HV GY611 HBEC :: STK450 MR28-40-3400 CC45 4cell V2 head and tail
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08-06-2007 10:02 PM  13 years ago
whirlybird 1

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flatwoods ky U.S.A.

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setup
Go to the "other" site and look up the video on setting up your trex.
Bobs videos are the gold standard for helping with set up.

50% on the pitch AFR (swash plate) is a good place to start and then reduce it if the travel is still to far. 50% should be about right to give you full travel without hitting the washout block at the top and bottom of its travel.
Hope this was clear
Mike
Blade Cp 11.1 lipos ugraded chassie bell-hiller dual tail motor /T-Rex SA Upgrading to SE
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08-07-2007 12:13 AM  13 years ago
Occusus Morsus

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Hobart, Tasmania - Australia

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Thanks
Wow, OK I had 70% all round. By reducing my pitch setting to 60% I get +10deg of pitch at top with pitch curve on 100% plus no collision. On bottom end i still have to limit pitch curve to 10% so that when tilting my swash i don't hit collar, Getting -8deg with this setting.

Might be able to goto 0% on pitch curve when i limit my aileron and elevator %'s to 60% or whatever, then will have perfect setup.

Having said that i'll still only get 20deg pitch shift, how do people get 22deg i.e. +11 -11deg's I will be at the absolute limit of my mechancial range at 20deg shift. Do you lengthen links up the top of the head or something?? Anyways if someone knows it would be interesting.

Thanks for all the help guys, appreciate it.
Jeff
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08-07-2007 12:14 AM  13 years ago
dct

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San Angelo TX.

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On your radio lower your pitch setting on your swash mix menu. This will limit the travel of your swash.
This is right.And what I did. I do use a Futaba radio.7C
**Now doing Forward Flight And EASY 3d! And having a Ball !!**
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08-07-2007 01:30 AM  13 years ago
jhamlinjr

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Milledgeville, GA, United States

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Im getting 11+ and like 14-, tried to figure it out forever. Im getting full travel with no binding. I finaly gave up.
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08-07-2007 03:25 AM  13 years ago
bigdog714

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Rochester, MN U.S.A.

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The manual for the SA recomends 65% aileron and elevator, and 80% pitch for Hitec Servos, the pitch curve is 5% to 95%, thats with TRVL.ADJ. at 100%, if you lengthen the conecting rods that go from the swash to the mixing arms, that will balance your pitch.MD 800
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08-07-2007 03:40 AM  13 years ago
jhamlinjr

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Milledgeville, GA, United States

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Ok. Ill have to check my radio. At work and dont have it with me. Thanks!
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08-07-2007 06:34 AM  13 years ago
helibird

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St. George, UT

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As previously said go to HF site and watch Finless's vid on setting up the 450 it lays it out perfectly. Basically start with the servos and work your way up thru the head.
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08-07-2007 11:36 AM  13 years ago
TomRex

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West Palm Beach Join Date: 12-28-2005

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The ultimate way to setup your head!
http://truebloodengineering.com/mod...=showpage&pid=4

Ignorance is the absence of facts.Stupid is lacking the intellectual capacity to comprehend the fact
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08-07-2007 12:05 PM  13 years ago
Corona44

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Sydney,NSW Australia

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I gotta go with TomRex, I bought one of those swash setup tools and haven't had any need to use trims since, just a fantastic way to get it perfect.

I have setup several Trex's now and I can happily state that all the eCCPM models, even the old plastic XL can manage at least +/-11 degs of pitch.

If pitch is uneven then your head is not setup with everything level at 50% travel (mid stick with a 0,50,100 pitch curve).
Flying, crashing & having a ball.
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08-07-2007 02:16 PM  13 years ago
jhamlinjr

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Milledgeville, GA, United States

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I swear to you that I have watched the videos and set my head up just like they advise. When I rebuild after my latest mishap then will try again. As far as my swash being level, my eyes are pretty good and after leveling swash by eye, I dont have to put in any trim. My swash travels full travel up and down the mainshaft with no binding. Just got too much negative pitch.
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08-07-2007 03:10 PM  13 years ago
dct

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San Angelo TX.

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Just got too much negative pitch.
That right there tell me you didn't set it up right.
If you set it at half throttle stick with not trim and you are 0 pitch. You will have the same travel up and down. Or you didn't get your servo arms at 90% from the start. Or you have revo mix or something like that on? I have setup 3 helicopters so I'm not a expert . But any time I have more pitch on one side of 0 it's my setup.
**Now doing Forward Flight And EASY 3d! And having a Ball !!**
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08-07-2007 03:19 PM  13 years ago
jhamlinjr

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Milledgeville, GA, United States

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Im quite aware that my head is not set up correctly, hence the reason I jumped in to Occusus's post. (Sorry,wasnt trying to steal it) I was giving you guys the scoop so that you could provide some enlightenment on what the problem might be. Ill figure it out. Thanks.
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08-07-2007 09:40 PM  13 years ago
StrangeRanger

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VT

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jhamlinjr, you're making this much harder on yourself than it has to be. The key here is that your mechanical set up is tweaked out of whack. The "videos" are a good place to get an understanding, but that's it. EVERY heli is going to be a little different.

- Start with all trims/sub-trims at zero, end points (travel adj) at 100% or full throw whatever your TX calls it. No mixing or any of that BS.
- Your sticks all at 50%.
- Your swash/aileron/elevator mix percentages can be at default settings. For JR radios that is like 60%, don't know what TX you're using though.
- With your heli level, put your servo arms on so they are perpendicular to your main mast. Or, parallel to the ground. Try different arms, flip them over, swap sides do whatever you have to to get them 90 deg to the mast w/out having to use sub-trim. Some will say don't use any sub-trim, but if you have to use a tiny bit, do it. You want all the arms at 90 deg.
- This next step is easier w/ a swash leveling tool, but it's not required. With your linkages from the swash up attached, position your swash so you have 0 deg of pitch. Find some way to hold it or mark it or just keep re-checking it. Now, MECHANICALLY adjust the push rods (lenghten or shorten them) from your servos to your swash. The goal here is to have the swash level front-to-back and side-to-side AND keep the 0 deg pitch.
- It takes some tweaking and patince, but it is actually pretty easy to do. Once you achieve this step you will have equal travel in both directions. Equal travel WITHOUT adjusting your curves or end points is critical to linear swash motion.
- Depending on how anal you are, ending up with a deg or two of + or - at mid-stick is not as important as a level swash. It's more important that you don't use your curves or end points to adjust the travel. This will end up in non-linear motion of your swash which will result in a "jumpy" heli.

Just get a cold beer, sit down, take your time and you'll get it. No worries.
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08-07-2007 09:58 PM  13 years ago
jhamlinjr

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Milledgeville, GA, United States

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Thanks Strangeranger. I have done that but maybe with this being my first heli it will just take some practice.
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08-08-2007 01:53 PM  13 years ago
StrangeRanger

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VT

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Yup, it always takes some practice and tweaking to find a set up routine that works for you. Just keep in mind, have FUN w/ it. Don't beat yourself up over it.
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