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Other › Pitch range problem.
05-07-2005 09:49 PM  13 years agoPost 1
medriver

rrApprentice

Scottsdale, AZ

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I am setting up my new T-rex for the first time and I am having an issue with my pitch range being completely off. When I manually move the collective pitch arm by hand, I get about +19 degrees of pitch and only about -2 the other way. I have starred at this thing for 3 hours now I can't figure out what it is. I checked the length on all of my linkages and made sure that my mixing levers etc are not backwards. If I were to really adust some of the linkages, that looks like it might take care of it but I don think there are enough of threads on them to do that. Plus if my lengths are correct, I shouldn't have to do that anyway. If anyone has run into this please let me know. I am about to go crazy!

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05-07-2005 09:54 PM  13 years agoPost 2
Smajly

rrNovice

Landskrona - Sweden

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Post some pictures from different angles.. it is easier to see if ther is something wrong that way..

I post a picture of mine and you can see if it helps you...


T-rex
Raptor 50, OS50SX-H, GY401/S9253, XeroG Carbonfiber CCPM
Raptor E 620 SE

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05-07-2005 10:09 PM  13 years agoPost 3
medriver

rrApprentice

Scottsdale, AZ

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I knew you I was going to be asked for those. I know it's hard to help without pics but unfortunantly I just sold my digital camera not long ago. I was hoping that maybe someone else had run into this too and had a quick fix for me. Thansk again.

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05-07-2005 10:17 PM  13 years agoPost 4
StrangeRanger

rrVeteran

VT

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medriver,
I know I'm stating the obvious here but sometimes ya never know. Are you SURE you have all your links set to the proper length? And are you SURE you have the links connected to the right balls? And your washout base is set up properly?
I know when I set my first one up, I ended up with the blade grips backwards and connected to the wrong links. They are TRAILING links on the blade grips. If you want I can post some pics later tonight. Let me know if they would help.
j

**EDIT** Someone posted this pic on another thread, it may help you:

http://www.runryder.com/gallery/28593/P4180414.jpg

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05-07-2005 10:54 PM  13 years agoPost 5
Gary Hoorn

rrKey Veteran

Annapolis Maryland USA

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Center all trims and sub-trims on the TX. Adjust all servo output arms to right angles of the pushrods, do not use trim or subtrim to accomplish this! Don't forget to put the screws back in after this Get them as close as possible. With the elevator seesaw and the swashplate level the small arm that connects to the pitch servo on the right side of the Heli must point straight down. The collective servo linkage should be adjusted so that the seesaw is centered in the opening. Once all this is set the linkages you install must keep the washout arms level as long as the swash remains level and the collective seesaw is centered, adjust their length as necessary. With all arms level the flybar arms must be level also. At that point the blades should be checked with a pitch gauge and adjusted level with the shortest links at the top. Be careful and do not mixup the various linkage rods. It is easy to confuse the 20mm and the 24mm linkages. Work from the swashplate up toward the blades. See pic. Note the red dots.
Hope this helps,
Gary

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05-08-2005 12:18 AM  13 years agoPost 6
medriver

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Scottsdale, AZ

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Thanks for the replies guys. I am going to go over it again with a fine tooth comb. With the help of your pictures, I am sure I will find out what I have done wrong. Thanks again and I will let you know what I find.

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05-08-2005 12:24 AM  13 years agoPost 7
Spartan Missile

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Coventry, UK

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Smajly - you tart !
You just had to show off your bling !
I'm half way there, give me a few weeks........

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05-08-2005 12:56 AM  13 years agoPost 8
medriver

rrApprentice

Scottsdale, AZ

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ok, so I went over it very carefully and compared mine to the pictures shown. It looks exactly the same. I also remeasured every link and made sure I didn't have them mixed up. I must have something wrong though. Is it possible I put the main shaft in backwards. I think the holes that are drilled through in it are at different distances on each end but I was pretty careful when I assembled it to make sure I had everything oriented correctly. Any other ideas?

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05-08-2005 02:02 AM  13 years agoPost 9
stangxs

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Huntington Beach, CA

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here are different angled pictures of my rex'


Other than that, I can't help..

just showing off the bling, haha, na, it may help

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05-08-2005 02:25 AM  13 years agoPost 10
Gary Hoorn

rrKey Veteran

Annapolis Maryland USA

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The end of the mainshaft with the hole closest to the end goes at the bottom. The difference is only 1mm so measure carefully.
Gary

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05-08-2005 02:46 AM  13 years agoPost 11
steed302

rrNovice

Wahiawa, Hawaii, USA

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did you check to ensure your washout base is on the right way?

Trex 450, Trex 600, Fury Extreme 91, Eco 8, Hawk Pro

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05-08-2005 03:41 AM  13 years agoPost 12
j5coat

rrVeteran

Phoenix

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all i can see in that picture is blue bling lol. if you need help medriver i might be able to help you, i live in north phoenix probably not to far from you. going flying tomorrow couple guys at our field have rex's im sure we can get you fixed up. just south of 19th ave and bell, come on out.

Trex 700, Trex 600n

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05-08-2005 04:12 AM  13 years agoPost 13
monts

rrApprentice

San Diego Ca

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Hey steed,

The instructions doesn't show the washout base going in a certain way.
Can it be installed upside down?

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05-08-2005 04:40 AM  13 years agoPost 14
mike lewis

rrApprentice

northeastern AZ

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Up in the North Country
You guys down in the valley are so lucky when it comes to flying. Up here the wind is blowing or it freezing and hard to fly a heli let alone a T-REX. Any one got a pic of their mounting setup's for there gyro's batteries and receivers? I finely got my Trex together and it flew for about 6 seconds upon landing in tall grass it broke the little plastic mixer arm. Let me see 6 seconds and it is time for my first upgrade! I will be coming to phoenix to see other heli flyer's before to long I am the only one within 100 miles makes me so sad. My plank er friends just don't understand.

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05-08-2005 10:49 AM  13 years agoPost 15
medriver

rrApprentice

Scottsdale, AZ

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Hey guys, thanks for all the help. I managed to figure out what was wrong. First I checked the main shaft and I did have the 4mm hole "closest to the end at te bottom so that wasn't it. At this point I decided to forget about the 42mm measurment which the linkage going from the top of the swash to the mixing lever is supposed to be. I went ahead and shortend those linkages up about 4 turns, and lengthend the linkages 2 turns on the blade grips. That fixed it! I guess the "ruler" I have been using isn't all that precise! Needless to say I managed to actually fly it tonight at the indoor basketball court here at my apartment complex. It is lot different then my Raptor! I was affraid to blink in fear of crashing. : ) I think I need to just do a little more tweaking on it and maybe loosen up some of the ball joints a little more. The only other issue I noticed was some tail wagging no matter where I set the gyro sensitivity. I might have that a little snug too! Overall I think this will be a fun little bird once I have it all tuned in. Thanks again for all the help guys. I don't know where I would be without the help on here, definently not in the air, thats for sure.

j5coat,

I think I might take you up on the offer tomorrow. I have been out to Turf Paradise once before when I was just getting my feet off the ground. Since then I have been flying off of Mayo Blvd and Scottsdale Rd. Hopefully I will see you out there if I can get out there before the Mother's Day family festivities kick off. Thanks again.

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05-08-2005 05:33 PM  13 years agoPost 16
Smajly

rrNovice

Landskrona - Sweden

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Mike Lewis >>>
Here's how I have mount mine...
Gyro:

Receiver:

and the batt.. :


T-rex
Raptor 50, OS50SX-H, GY401/S9253, XeroG Carbonfiber CCPM
Raptor E 620 SE

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05-08-2005 07:21 PM  13 years agoPost 17
mike lewis

rrApprentice

northeastern AZ

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Thanks for the Pict's
I also see that the adjustments of the ball links is somewhat more sensitive than my other heli's Thanks for eye opening information it sure helps to see the problems of others and how they are resolved, it helps us all to grow in wisdom and stature Thanks again Mike

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05-08-2005 10:50 PM  13 years agoPost 18
j5coat

rrVeteran

Phoenix

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i pretty much have the same setup but i put my reciever in the back under the belt gears, it works well and the antenna comes right out the back. works good because its in between the servos and gyro so they meet 1/2 way. ill have pics in my gallery tomorrow.

Trex 700, Trex 600n

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